JB/T 6452-1992 Basic technical requirements for electric hydraulic thrusters
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6452-1992
Basic Technical Requirements for Electric Hydraulic Thrusters
Published on August 6, 1992
Implementation of the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Basic Technical Requirements for Electric Hydraulic Thrusters
1 Subject Content and Scope of Application
JB/T 6452-1992
This standard specifies the terms, symbols, classification, basic parameters, working conditions, installation conditions, technical requirements, test methods, test rules and markings, packaging, transportation, storage requirements, etc. of electric hydraulic thrusters (hereinafter referred to as thrusters). This standard is mainly applicable to thrusters with rated voltage AC 50Hz, 660V and below, which are used as driving elements of external block brakes, and can also be applied to thrusters that operate other machinery or mechanisms. 2 Reference standards
National standards
GB1032
GB4207
GB6333
Low-voltage switchgear and controlgear
Basic technical requirements for rotating electrical machines
Test methods for three-phase asynchronous motors
Basic environmental test procedures for electrical and electronic productsTest A: Low-temperature test methodDetermination of the comparative tracking index of solid insulating materials under humid conditionsProtection level of low-voltage electrical enclosures| |tt||Fire hazard test for electrical and electronic products
Electro-hydraulic block brakes
GB/T13384 General technical conditions for packaging of electromechanical products JB3284
Glow-wire test methods and guidelines
Basic environmental conditions and test methods for transportation and storage of motors and electrical products JB/ZQ4388YWZ100~800 Brakes
3 Terms and symbols
3.1 Terms
normal working pressure
3.1.1 Normal working pressure
When the pusher is working normally, the pressure on the inner surface of its hydraulic cylinder is equal to the pressure formed on its piston by the actual thrust of the pusher.
3.1.2 Specified conditions providedcondition This standard specifically refers to the operating state of the pusher and its environmental conditions, that is, the cold state, warm (25 ± 10C), rated voltage, rated power frequency, rated load and vertical installation. 3.1.3 Extreme conditions extremecondition This standard specifically refers to the operating state of the pusher and its environmental conditions, that is, the hot state, the highest ambient temperature (+40°C) and the cold state, the lowest ambient temperature (-25°C), applying 85% of the rated voltage, rated power frequency, rated load and tilted 15\ installation. 3.1.4 Thrust thrust
The force output by the push rod of the pusher.
3.1.5 Stroke
The distance the push rod moves when the pusher is in action. 3.1.6 The function of stroke automatically compensation is a special function of the pusher, which can automatically eliminate the increased back distance due to the wear of the brake pad of the block brake, so that the back distance can be maintained constant. Approved by the Ministry of Machinery and Electronics Industry on August 6, 1992 and implemented on January 1, 1993. 3.1.7 Load is the force applied to the push rod of the pusher and opposite to the thrust direction. 3.1.8 Primary position is the lowest position of the push rod under the action of external force or deadweight when the pusher is installed vertically and the power is not connected. 3.1.9 Operating (lifting) time is the time required from the moment the pusher is powered on to the time when the push rod moves a certain stroke. 3.1.10 Return (lowering) time is the time required from the moment the pusher is powered off to the time when the push rod resets a certain stroke. 3.1.11 Maximum thrust
maximumthrust
Under specified conditions, the maximum thrust value that the pusher has to reach the rated (working) stroke. 3.1.12 Weight load method A test method in which a code is applied to the push rod to simulate mechanical load when the pusher is installed vertically. 3.1.13 Operation cycle operation cycle The process from the moment the pusher is powered on, through starting, holding and power-off reset, until the next power-on moment is called an operation cycle.
3.2 Symbols
AC, alternating current
Ui: constant insulation voltage
Frax: maximum thrust
Ca: constant damp heat test level
IP: enclosure protection level
4 Product classification
4.1 Type of thruster
U. Rated working voltage
Fe Rated thrust
Db: alternating mixed heat test
CTI: comparative tracking index
4.1.1 According to the medium in which the motor is located, it can be divided into oil-immersed type and air type. 4.1.2 According to the number of thrust rods for output thrust; single-rod type and double-rod type. 4.2 Models and meanings of pushers
Models and meanings of pushers are as follows:
Rated stroke code
Derived function code
Rated thrust code
Design code
Electric hydraulic pusher
Note: ①Rated stroke code is only used for pushers with two or less rated strokes corresponding to the same rated thrust, otherwise, the code is omitted. ②For the derived function code, see Appendix A (supplement). 4.3Dimension requirements
The dimensions of the pusher must be compatible with the requirements of JB/2Q4388 and GB6333. Note: See Appendix B (supplement) for the preferred dimensions when developing new products. 2
5 Basic parameters
5.1 Power supply
JB/T6452-1992
The rated working voltage Ue of the actuator is AC three-phase 380V or 660V; a.
The rated power frequency of the actuator is 50Hz. b.
5.2 Rated insulation voltage
The rated insulation voltage Ui of the actuator is 380V or 660V. 5.3
Rated thrust
The rated thrust shall conform to the following numerical system (unit: N): 180), 200, (220), 250, 300, 400, (450), 500, (700), 800, (900), 1000, 1250, (100),
(1800), 2000, (3000), 3150, (3200). Note, the numbers without brackets are the preferred R10 number system, which is the recommended thrust level when developing new products. 5.4
Rated stroke (rated working stroke)
The rated stroke (rated working stroke) should conform to the following stroke number system (unit: mm): 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 100, 120.5.5
Rated duty system
The rated duty systems applicable to the thruster are:
Uninterrupted duty system;
Intermittent cycle duty system.
The number of operating cycles per hour of the thruster under the intermittent cycle working system is divided into the following levels: 300 level
600 level
1200 level
1800 level
300 times/h
600 times/h
1200 times/h
1800 times/h
The load factor (power-on duration) is divided into 40% and 60%. 6
Normal working conditions and installation conditions
6.1 Normal working conditions
6.1.1 Ambient air temperature
The upper limit of the ambient air temperature is +40℃, and its average value within 24 hours does not exceed +35℃; a.
The lower limit of the ambient air temperature is -25℃.
Note: For thrusters used in ambient air temperatures with an upper limit higher than +40°C and a lower limit lower than -25°C, the relevant performance indicators and verification are separately specified in the specific product standards.
The altitude of the installation site shall not exceed 2000m.
6.1.3 Atmospheric conditions
6.1.3.1 Humidity
The relative air intensity at the installation site shall not exceed 50% when the maximum temperature is +40°C. Higher relative humidity is allowed at lower temperatures. The average monthly temperature of the wettest month shall not be higher than +25°C, and the average maximum relative humidity of the month shall not exceed 90%. Condensation on the product due to temperature changes must be considered. 6.1.3.2 Pollution level
The pollution level of the environment around the actuator is level 3 or level 4. 6.1.4 Shock and vibration
JB/T6452-1992
Requires the use of vibrators under shock and vibration conditions. The requirements and verification shall be agreed upon by the supply and demand parties, and may also be specified in the specific product standards with reference to relevant standards.
6.2 Installation conditions
6.2.1 Installation category (overvoltage category)
The installation category of the actuator is Class II or Class II. 6.2.2 Requirements for installation inclination angle
The angle between the installation axis of the vertically installed thruster and the vertical line should not exceed 15°. Structural and performance requirements
Thrusters should be manufactured according to drawings and technical documents approved by the prescribed procedures. 7.1 Structural requirements
7.1.1 Materials
Thrusters should be selected from appropriate materials that meet the use requirements and meet the relevant test requirements after forming the thruster. Special attention should be paid to the flame retardancy and mixing resistance of the materials.
The suitability of the selected materials can be verified by the following tests, which can be carried out on the thruster and (or) thruster components: aging resistance of elastic sealing components;
Moisture resistance;
Resistance to abnormal heat and fire hazards.
For resistance to abnormal heat and fire hazards, the test should be carried out on the thruster or on appropriate components removed from the thruster in priority. However, in some cases, it is allowed to replace the test on the thruster or its components with the test on the selected materials. 7.1.1.1 Aging resistance of elastic sealing parts The elastic sealing parts of the pusher made of rubber or similar materials (such as gaskets, sealing rings, etc.) should have aging resistance, which should be able to withstand the test assessment of the conditions specified in Article 8.1.1. 7.1.1.2 Moisture resistance
The pusher should have the ability to adapt to the humidity that may occur under normal working conditions. This ability should be able to withstand the test assessment of the conditions specified in Article 8.1.2.
7.1.1.3 Resistance to abnormal heat and fire hazards
Insulating material parts may be subjected to thermal stress due to electrical effects, and insulation deterioration may damage product safety. These parts should not fail or endanger safety when subjected to abnormal heat and fire. The insulating material used in the pusher should be able to withstand the test assessment specified in Article 8.1.4. 7.1.1.4 Material groups of insulating materials
The comparative tracking index (CTI) of the insulating materials selected for the actuator is specified as: Insulating material group Ia175≤CTI<400
Insulating material group I
400≤CTI<600
7.1.1.5 Requirements for working oil
The working oil injected into the actuator shall not contain impurities and moisture. For actuators with oil-immersed motors, insulating oil should be used. The model and specifications of the working oil should be specified in the specific product standards. 7.1.2 Electrical clearance and creepage distance
Except for the motor, the electrical clearance and creepage distance of the remaining live parts of the actuator shall be as specified below. 7.1.2.1 Electrical clearance
The minimum electrical clearance of the actuator shall be determined according to Table 1 based on the rated working voltage of the specific product, different installation categories and pollution levels. 7.1.2.2 Electrical clearance The minimum creepage distance of the actuator shall be determined according to the rated working voltage, pollution degree and material group of the specific product in accordance with Table 1. 4
Actuator
Rated working
Terminals
7.1.3.1 Structural requirements for terminal blocks
JB/T 6452—1992
Table 1 Determination of electrical clearance and creepage distance
Minimum electrical clearance
Installation category
Minimum creepage distance
Pollution degree
Terminals shall be connected to the conductors with screws or nuts and elastic connections or other equivalent measures to ensure that the necessary contact pressure is maintained permanently:
The structure of the terminal blocks shall be able to compress the conductors between appropriate contact surfaces without damaging the conductors and terminals; b.
Specified value.
The structure of the terminal should not allow the (connected) wire to move so as to be harmful to the normal operation of the actuator and reduce the insulation voltage to a level lower than the capacity of the wire connected to the terminal
7. 1. 3. 2
The terminal should be able to connect wires of sufficient cross-section. The recommended wire cross-section sizes are: 0.5, 0.75, 1.0, 1.5, 2.5mm. The maximum cross-section of the wire that can be connected to the terminal is 2.5mm, and the minimum cross-section of the wire that can be connected is 0.5mm. 7.1.3.3 Connection of terminal
When installing and connecting external wires, the terminal should be easy to enter and convenient for wiring; the screws or nuts used for wiring should not be used for other purposes. b.
7. 1. 3. 4
Mechanical strength of terminal
The tightening torque of the terminal should not be less than that specified in Table 2. Tightening torque of terminal
Thread diameter
Tightening torque
Note that the tightening torque is determined according to the structure of tightening the screw or nut with the help of a screwdriver. 7.1.3.5 Marking of terminal
The terminal of the pusher and the three-phase power supply should be marked with letters U, V, and W respectively. 7.1. 4
Grounding terminal
The grounding terminal should be located in a place that is easy to access and convenient for wiring, and the grounding of the pusher should be maintained after any detachable parts are removed; the grounding terminal should have appropriate anti-corrosion measures; the minimum size of the grounding screw is M4, and it cannot be used for other purposes; there should be a clear grounding mark next to the grounding terminal (). Sealing of the pusher
The pusher should have good sealing and no leakage. 7.1.6 Protection level of the outer shell of the thruster
For thrusters with requirements for the protection level of the outer shell, the following protection levels are recommended: IP40, IP50, IP54, IP55.
7.1.7 Requirements for motors
JB/T6452-1992
7.1.7.1 The motors used in thrusters shall comply with the provisions of GB755 and the specific product standards for special motors. 7.1.7.2 The insulation level of the motors used in thrusters shall not be lower than Class E. 7.2 Performance requirements
7.2.1 Temperature rise
Under the ambient air temperature specified in Article 6.1.1 and the working system specified in Article 5.5, the temperature rise of each part of the thruster shall not be higher than the provisions of Table 3.
Table 3 Temperature rise limit of thruster
Structural type
Oil-type motor thruster
Air-type motor thruster
7.2.2 Dielectric properties
Insulation grade of motor winding
Terminals
7.2.2.1 The dielectric properties of thrusters are specified in the specific product standards. One of the following requirements can be selected: a.
Phenomenon;
The thruster should be able to withstand the AC voltage value of 2Ui+1000V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. In addition to the motor being verified according to the relevant requirements of GB755, the thruster should be able to withstand the AC 2500V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. b.
1min
7.2.2.2 After the pusher is filled with oil, the cold insulation resistance of the motor winding to the housing shall not be less than 20M0. 7.2.3 Action time characteristics
The full stroke starting (rise) time and full stroke reset (fall) time of the pusher under specified conditions shall not exceed the time upper limit shown in Table 4 according to the rated thrust and stroke of the product. Table 4
C≤80
80C≤120
4002 Requirements for installation inclination angle
The angle between the installation axis of the vertically installed thruster and the vertical line should not exceed 15°. Structural and performance requirements
Thrusters should be manufactured according to drawings and technical documents approved by the prescribed procedures. 7.1 Structural requirements
7.1.1 Materials
Thrusters should be selected from appropriate materials that meet the use requirements and meet the relevant test requirements after forming the thruster. Special attention should be paid to the flame retardant and mixed resistance of the materials.
The suitability of the selected materials can be verified by the following tests, which can be carried out on the thruster and (or) thruster components: aging resistance of elastic sealing components;
Moisture resistance;
Resistance to abnormal heat and fire hazards.
For resistance to abnormal heat and fire hazards, the test should be carried out on the thruster or on appropriate components removed from the thruster in priority. However, in some cases, it is allowed to replace the test on the thruster or its components with the test on the selected materials. 7.1.1.1 Aging resistance of elastic sealing parts The elastic sealing parts of the pusher made of rubber or similar materials (such as gaskets, sealing rings, etc.) should have aging resistance, which should be able to withstand the test assessment of the conditions specified in Article 8.1.1. 7.1.1.2 Moisture resistance
The pusher should have the ability to adapt to the humidity that may occur under normal working conditions. This ability should be able to withstand the test assessment of the conditions specified in Article 8.1.2.
7.1.1.3 Resistance to abnormal heat and fire hazards
Insulating material parts may be subjected to thermal stress due to electrical effects, and insulation deterioration may damage product safety. These parts should not fail or endanger safety when subjected to abnormal heat and fire. The insulating material used in the pusher should be able to withstand the test assessment specified in Article 8.1.4. 7.1.1.4 Material groups of insulating materials
The comparative tracking index (CTI) of the insulating materials selected for the actuator is specified as: Insulating material group Ia175≤CTI<400
Insulating material group I
400≤CTI<600
7.1.1.5 Requirements for working oil
The working oil injected into the actuator shall not contain impurities and moisture. For actuators with oil-immersed motors, insulating oil should be used. The model and specifications of the working oil should be specified in the specific product standards. 7.1.2 Electrical clearance and creepage distance
Except for the motor, the electrical clearance and creepage distance of the remaining live parts of the actuator shall be as specified below. 7.1.2.1 Electrical clearance
The minimum electrical clearance of the actuator shall be determined according to Table 1 based on the rated working voltage of the specific product, different installation categories and pollution levels. 7.1.2.2 Electrical clearance The minimum creepage distance of the actuator shall be determined according to the rated working voltage, pollution degree and material group of the specific product in accordance with Table 1. 4
Actuator
Rated working
Terminals
7.1.3.1 Structural requirements for terminal blocks
JB/T 6452—1992
Table 1 Determination of electrical clearance and creepage distance
Minimum electrical clearance
Installation category
Minimum creepage distance
Pollution degree
Terminals shall be connected to the conductors with screws or nuts and elastic connections or other equivalent measures to ensure that the necessary contact pressure is maintained permanently:
The structure of the terminal blocks shall be able to compress the conductors between appropriate contact surfaces without damaging the conductors and terminals; b.
Specified value.
The structure of the terminal should not allow the (connected) wire to move so as to be harmful to the normal operation of the actuator and reduce the insulation voltage to a level lower than the capacity of the wire connected to the terminal
7. 1. 3. 2
The terminal should be able to connect wires of sufficient cross-section. The recommended wire cross-section sizes are: 0.5, 0.75, 1.0, 1.5, 2.5mm. The maximum cross-section of the wire that can be connected to the terminal is 2.5mm, and the minimum cross-section of the wire that can be connected is 0.5mm. 7.1.3.3 Connection of terminal
When installing and connecting external wires, the terminal should be easy to enter and convenient for wiring; the screws or nuts used for wiring should not be used for other purposes. b.
7. 1. 3. 4
Mechanical strength of terminal
The tightening torque of the terminal should not be less than that specified in Table 2. Tightening torque of terminal
Thread diameter
Tightening torque
Note that the tightening torque is determined according to the structure of tightening the screw or nut with the help of a screwdriver. 7.1.3.5 Marking of terminal
The terminal of the pusher and the three-phase power supply should be marked with letters U, V, and W respectively. 7.1. 4
Grounding terminal
The grounding terminal should be located in a place that is easy to access and convenient for wiring, and the grounding of the pusher should be maintained after any detachable parts are removed; the grounding terminal should have appropriate anti-corrosion measures; the minimum size of the grounding screw is M4, and it cannot be used for other purposes; there should be a clear grounding mark next to the grounding terminal (). Sealing of the pusher
The pusher should have good sealing and no leakage. 7.1.6 Protection level of the outer shell of the thruster
For thrusters with requirements for the protection level of the outer shell, the following protection levels are recommended: IP40, IP50, IP54, IP55.
7.1.7 Requirements for motors
JB/T6452-1992
7.1.7.1 The motors used in thrusters shall comply with the provisions of GB755 and the specific product standards for special motors. 7.1.7.2 The insulation level of the motors used in thrusters shall not be lower than Class E. 7.2 Performance requirements
7.2.1 Temperature rise
Under the ambient air temperature specified in Article 6.1.1 and the working system specified in Article 5.5, the temperature rise of each part of the thruster shall not be higher than the provisions of Table 3.
Table 3 Temperature rise limit of thruster
Structural type
Oil-type motor thruster
Air-type motor thruster
7.2.2 Dielectric properties
Insulation grade of motor winding
Terminals
7.2.2.1 The dielectric properties of thrusters are specified in the specific product standards. One of the following requirements can be selected: a.
Phenomenon;
The thruster should be able to withstand the AC voltage value of 2Ui+1000V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. In addition to the motor being verified according to the relevant requirements of GB755, the thruster should be able to withstand the AC 2500V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. b.
1min
7.2.2.2 After the pusher is filled with oil, the cold insulation resistance of the motor winding to the housing shall not be less than 20M0. 7.2.3 Action time characteristics
The full stroke starting (rise) time and full stroke reset (fall) time of the pusher under specified conditions shall not exceed the time upper limit shown in Table 4 according to the rated thrust and stroke of the product. Table 4
C≤80
80C≤120
4002 Requirements for installation inclination angle
The angle between the installation axis of the vertically installed thruster and the vertical line should not exceed 15°. Structural and performance requirements
Thrusters should be manufactured according to drawings and technical documents approved by the prescribed procedures. 7.1 Structural requirements
7.1.1 Materials
Thrusters should be selected from appropriate materials that meet the use requirements and meet the relevant test requirements after forming the thruster. Special attention should be paid to the flame retardant and mixed resistance of the materials.
The suitability of the selected materials can be verified by the following tests, which can be carried out on the thruster and (or) thruster components: aging resistance of elastic sealing components;
Moisture resistance;
Resistance to abnormal heat and fire hazards.
For resistance to abnormal heat and fire hazards, the test should be carried out on the thruster or on appropriate components removed from the thruster in priority. However, in some cases, it is allowed to replace the test on the thruster or its components with the test on the selected materials. 7.1.1.1 Aging resistance of elastic sealing parts The elastic sealing parts of the pusher made of rubber or similar materials (such as gaskets, sealing rings, etc.) should have aging resistance, which should be able to withstand the test assessment of the conditions specified in Article 8.1.1. 7.1.1.2 Moisture resistance
The pusher should have the ability to adapt to the humidity that may occur under normal working conditions. This ability should be able to withstand the test assessment of the conditions specified in Article 8.1.2.
7.1.1.3 Resistance to abnormal heat and fire hazards
Insulating material parts may be subjected to thermal stress due to electrical effects, and insulation deterioration may damage product safety. These parts should not fail or endanger safety when subjected to abnormal heat and fire. The insulating material used in the pusher should be able to withstand the test assessment specified in Article 8.1.4. 7.1.1.4 Material groups of insulating materials
The comparative tracking index (CTI) of the insulating materials selected for the actuator is specified as: Insulating material group Ia175≤CTI<400
Insulating material group I
400≤CTI<600
7.1.1.5 Requirements for working oil
The working oil injected into the actuator shall not contain impurities and moisture. For actuators with oil-immersed motors, insulating oil should be used. The model and specifications of the working oil should be specified in the specific product standards. 7.1.2 Electrical clearance and creepage distance
Except for the motor, the electrical clearance and creepage distance of the remaining live parts of the actuator shall be as specified below. 7.1.2.1 Electrical clearance
The minimum electrical clearance of the actuator shall be determined according to Table 1 based on the rated working voltage of the specific product, different installation categories and pollution levels. 7.1.2.2 Electrical clearance
The minimum creepage distance of the actuator shall be determined according to the rated working voltage, pollution degree and material group of the specific product in accordance with Table 1. 4
Actuator
Rated working
Terminals
7.1.3.1 Structural requirements for terminal blocks
JB/T 6452—1992
Table 1 Determination of electrical clearance and creepage distance
Minimum electrical clearance
Installation category
Minimum creepage distance
Pollution degree
Terminals shall be connected to the conductors with screws or nuts and elastic connections or other equivalent measures to ensure that the necessary contact pressure is maintained permanently:
The structure of the terminal blocks shall be able to compress the conductors between appropriate contact surfaces without damaging the conductors and terminals; b.
Specified value.
The structure of the terminal should not allow the (connected) wire to move so as to be harmful to the normal operation of the actuator and reduce the insulation voltage to a level lower than the capacity of the wire connected to the terminal
7. 1. 3. 2
The terminal should be able to connect wires of sufficient cross-section. The recommended wire cross-section sizes are: 0.5, 0.75, 1.0, 1.5, 2.5mm. The maximum cross-section of the wire that can be connected to the terminal is 2.5mm, and the minimum cross-section of the wire that can be connected is 0.5mm. 7.1.3.3 Connection of Terminals
When installing and connecting external wires, the terminal should be easy to enter and convenient for wiring; the screws or nuts used for wiring should not be used for other purposes. b.
7. 1. 3. 4
Mechanical strength of the terminal
The tightening torque of the terminal should not be less than that specified in Table 2. Tightening torque of terminal
Thread diameter
Tightening torque
Note that the tightening torque is determined according to the structure of tightening the screw or nut with the help of a screwdriver. 7.1.3.5 Marking of terminal
The terminal of the pusher and the three-phase power supply should be marked with letters U, V, and W respectively. 7.1. 4
Grounding terminal
The grounding terminal should be located in a place that is easy to access and convenient for wiring, and the grounding of the pusher should be maintained after any detachable parts are removed; the grounding terminal should have appropriate anti-corrosion measures; the minimum size of the grounding screw is M4, and it cannot be used for other purposes; there should be a clear grounding mark next to the grounding terminal (). Sealing of the pusher
The pusher should have good sealing and no leakage. 7.1.6 Enclosure protection level of the pusher
For pushers with enclosure protection level requirements, the following protection levels are recommended: IP40, IP50, IP54, IP55.
7.1.7 Requirements for motors
JB/T6452-1992
7.1.7.1 The motors used in the pushers shall comply with the provisions of GB755 and the specific product standards for special motors. 7.1.7.2 The insulation level of the motors used in the pushers shall not be lower than Class E. 7.2 Performance requirements
7.2.1 Temperature rise
Under the ambient air temperature specified in Article 6.1.1 and the working system specified in Article 5.5, the temperature rise of each part of the pusher shall not be higher than the provisions of Table 3.
Table 3 Temperature rise limit of thruster
Structural type
Oil-type motor thruster
Air-type motor thruster
7.2.2 Dielectric properties
Insulation grade of motor winding
Terminals
7.2.2.1 The dielectric properties of thrusters are specified in the specific product standards. One of the following requirements can be selected: a.
Phenomenon;
The thruster should be able to withstand the AC voltage value of 2Ui+1000V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. In addition to the motor being verified according to the relevant requirements of GB755, the thruster should be able to withstand the AC 2500V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. b.
1min
7.2.2.2 After the pusher is filled with oil, the cold insulation resistance of the motor winding to the housing shall not be less than 20M0. 7.2.3 Action time characteristics
The full stroke starting (rise) time and full stroke reset (fall) time of the pusher under specified conditions shall not exceed the time upper limit shown in Table 4 according to the rated thrust and stroke of the product. Table 4
C≤80
80C≤120
4004 Material groups of insulating materials
The comparative tracking index (CTI) of the insulating materials selected for the pusher is specified as: Insulating material group Ia175≤CTI<400
Insulating material group I
400≤CTI<600
7.1.1.5 Requirements for working oil
The working oil injected into the pusher shall not contain impurities and moisture. For pushers with oil-immersed motors, insulating oil should be used. The model and specifications of the working oil should be specified in the specific product standards. 7.1.2 Electrical clearance and creepage distance
Except for the motor, the electrical clearance and creepage distance of the remaining live parts of the pusher shall be as specified below. 7.1.2.1 Electrical clearance
The minimum electrical clearance of the pusher shall be determined according to Table 1 based on the rated working voltage of the specific product, different installation categories and pollution levels. 7.1.2.2 Electrical clearance
The minimum creepage distance of the actuator shall be determined according to the rated working voltage, pollution degree and material group of the specific product in accordance with Table 1. 4
Actuator
Rated working
Terminals
7.1.3.1 Structural requirements for terminal blocks
JB/T 6452—1992
Table 1 Determination of electrical clearance and creepage distance
Minimum electrical clearance
Installation category
Minimum creepage distance
Pollution degree
Terminals shall be connected to the conductors with screws or nuts and elastic connections or other equivalent measures to ensure that the necessary contact pressure is maintained permanently:
The structure of the terminal blocks shall be able to compress the conductors between appropriate contact surfaces without damaging the conductors and terminals; b.
Specified value.
The structure of the terminal should not allow the (connected) wire to move so as to be harmful to the normal operation of the actuator and reduce the insulation voltage to a level lower than the capacity of the wire connected to the terminal
7. 1. 3. 2
The terminal should be able to connect wires of sufficient cross-section. The recommended wire cross-section sizes are: 0.5, 0.75, 1.0, 1.5, 2.5mm. The maximum cross-section of the wire that can be connected to the terminal is 2.5mm, and the minimum cross-section of the wire that can be connected is 0.5mm. 7.1.3.3 Connection of Terminals
When installing and connecting external wires, the terminal should be easy to enter and convenient for wiring; the screws or nuts used for wiring should not be used for other purposes. b.bZxz.net
7. 1. 3. 4
Mechanical strength of the terminal
The tightening torque of the terminal should not be less than that specified in Table 2. Tightening torque of terminal
Thread diameter
Tightening torque
Note that the tightening torque is determined according to the structure of tightening the screw or nut with the help of a screwdriver. 7.1.3.5 Marking of terminal
The terminal of the pusher and the three-phase power supply should be marked with letters U, V, and W respectively. 7.1. 4
Grounding terminal
The grounding terminal should be located in a place that is easy to access and convenient for wiring, and the grounding of the pusher should be maintained after any detachable parts are removed; the grounding terminal should have appropriate anti-corrosion measures; the minimum size of the grounding screw is M4, and it cannot be used for other purposes; there should be a clear grounding mark next to the grounding terminal (). Sealing of the pusher
The pusher should have good sealing and no leakage. 7.1.6 Enclosure protection level of the pusher
For pushers with enclosure protection level requirements, the following protection levels are recommended: IP40, IP50, IP54, IP55.
7.1.7 Requirements for motors
JB/T6452-1992
7.1.7.1 The motors used in the pushers shall comply with the provisions of GB755 and the specific product standards for special motors. 7.1.7.2 The insulation level of the motors used in the pushers shall not be lower than Class E. 7.2 Performance requirements
7.2.1 Temperature rise
Under the ambient air temperature specified in Article 6.1.1 and the working system specified in Article 5.5, the temperature rise of each part of the pusher shall not be higher than the provisions of Table 3.
Table 3 Temperature rise limit of thruster
Structural type
Oil-type motor thruster
Air-type motor thruster
7.2.2 Dielectric properties
Insulation grade of motor winding
Terminals
7.2.2.1 The dielectric properties of thrusters are specified in the specific product standards. One of the following requirements can be selected: a.
Phenomenon;
The thruster should be able to withstand the AC voltage value of 2Ui+1000V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. In addition to the motor being verified according to the relevant requirements of GB755, the thruster should be able to withstand the AC 2500V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. b.
1min
7.2.2.2 After the pusher is filled with oil, the cold insulation resistance of the motor winding to the housing shall not be less than 20M0. 7.2.3 Action time characteristics
The full stroke starting (rise) time and full stroke reset (fall) time of the pusher under specified conditions shall not exceed the time upper limit shown in Table 4 according to the rated thrust and stroke of the product. Table 4
C≤80
80C≤120
4004 Material groups of insulating materials
The comparative tracking index (CTI) of the insulating materials selected for the pusher is specified as: Insulating material group Ia175≤CTI<400
Insulating material group I
400≤CTI<600
7.1.1.5 Requirements for working oil
The working oil injected into the pusher shall not contain impurities and moisture. For pushers with oil-immersed motors, insulating oil should be used. The model and specifications of the working oil should be specified in the specific product standards. 7.1.2 Electrical clearance and creepage distance
Except for the motor, the electrical clearance and creepage distance of the remaining live parts of the pusher shall be as specified below. 7.1.2.1 Electrical clearance
The minimum electrical clearance of the pusher shall be determined according to Table 1 based on the rated working voltage of the specific product, different installation categories and pollution levels. 7.1.2.2 Electrical clearance
The minimum creepage distance of the actuator shall be determined according to the rated working voltage, pollution degree and material group of the specific product in accordance with Table 1. 4
Actuator
Rated working
Terminals
7.1.3.1 Structural requirements for terminal blocks
JB/T 6452—1992
Table 1 Determination of electrical clearance and creepage distance
Minimum electrical clearance
Installation category
Minimum creepage distance
Pollution degree
Terminals shall be connected to the conductors with screws or nuts and elastic connections or other equivalent measures to ensure that the necessary contact pressure is maintained permanently:
The structure of the terminal blocks shall be able to compress the conductors between appropriate contact surfaces without damaging the conductors and terminals; b.
Specified value.
The structure of the terminal should not allow the (connected) wire to move so as to be harmful to the normal operation of the actuator and reduce the insulation voltage to a level lower than the capacity of the wire connected to the terminal
7. 1. 3. 2
The terminal should be able to connect wires of sufficient cross-section. The recommended wire cross-section sizes are: 0.5, 0.75, 1.0, 1.5, 2.5mm. The maximum cross-section of the wire that can be connected to the terminal is 2.5mm, and the minimum cross-section of the wire that can be connected is 0.5mm. 7.1.3.3 Connection of Terminals
When installing and connecting external wires, the terminal should be easy to enter and convenient for wiring; the screws or nuts used for wiring should not be used for other purposes. b.
7. 1. 3. 4
Mechanical strength of the terminal
The tightening torque of the terminal should not be less than that specified in Table 2. Tightening torque of terminal
Thread diameter
Tightening torque
Note that the tightening torque is determined according to the structure of tightening the screw or nut with the help of a screwdriver. 7.1.3.5 Marking of terminal
The terminal of the pusher and the three-phase power supply should be marked with letters U, V, and W respectively. 7.1. 4
Grounding terminal
The grounding terminal should be located in a place that is easy to access and convenient for wiring, and the grounding of the pusher should be maintained after any detachable parts are removed; the grounding terminal should have appropriate anti-corrosion measures; the minimum size of the grounding screw is M4, and it cannot be used for other purposes; there should be a clear grounding mark next to the grounding terminal (). Sealing of the pusher
The pusher should have good sealing and no leakage. 7.1.6 Protection level of the outer shell of the thruster
For thrusters with requirements for the protection level of the outer shell, the following protection levels are recommended: IP40, IP50, IP54, IP55.
7.1.7 Requirements for motors
JB/T6452-1992
7.1.7.1 The motors used in thrusters shall comply with the provisions of GB755 and the specific product standards for special motors. 7.1.7.2 The insulation level of the motors used in thrusters shall not be lower than Class E. 7.2 Performance requirements
7.2.1 Temperature rise
Under the ambient air temperature specified in Article 6.1.1 and the working system specified in Article 5.5, the temperature rise of each part of the thruster shall not be higher than the provisions of Table 3.
Table 3 Temperature rise limit of thruster
Structural type
Oil-type motor thruster
Air-type motor thruster
7.2.2 Dielectric properties
Insulation grade of motor winding
Terminals
7.2.2.1 The dielectric properties of thrusters are specified in the specific product standards. One of the following requirements can be selected: a.
Phenomenon;
The thruster should be able to withstand the AC voltage value of 2Ui+1000V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. In addition to the motor being verified according to the relevant requirements of GB755, the thruster should be able to withstand the AC 2500V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. b.
1min
7.2.2.2 After the pusher is filled with oil, the cold insulation resistance of the motor winding to the housing shall not be less than 20M0. 7.2.3 Action time characteristics
The full stroke starting (rise) time and full stroke reset (fall) time of the pusher under specified conditions shall not exceed the time upper limit shown in Table 4 according to the rated thrust and stroke of the product. Table 4
C≤80
80C≤120
4006 Enclosure protection level of the pusher
For pushers with enclosure protection level requirements, the following protection levels are recommended: IP40, IP50, IP54, IP55.
7.1.7 Requirements for motors
JB/T6452-1992
7.1.7.1 The motors used in the pushers shall comply with the provisions of GB755 and the specific product standards for special motors. 7.1.7.2 The insulation level of the motors used in the pushers shall not be lower than Class E. 7.2 Performance requirements
7.2.1 Temperature rise
Under the ambient air temperature specified in Article 6.1.1 and the working system specified in Article 5.5, the temperature rise of each part of the pusher shall not be higher than the provisions of Table 3.
Table 3 Temperature rise limit of thruster
Structural type
Oil-type motor thruster
Air-type motor thruster
7.2.2 Dielectric properties
Insulation grade of motor winding
Terminals
7.2.2.1 The dielectric properties of thrusters are specified in the specific product standards. One of the following requirements can be selected: a.
Phenomenon;
The thruster should be able to withstand the AC voltage value of 2Ui+1000V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. In addition to the motor being verified according to the relevant requirements of GB755, the thruster should be able to withstand the AC 2500V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. b.
1min
7.2.2.2 After the pusher is filled with oil, the cold insulation resistance of the motor winding to the housing shall not be less than 20M0. 7.2.3 Action time characteristics
The full stroke starting (rise) time and full stroke reset (fall) time of the pusher under specified conditions shall be based on the rated thrust and stroke of the product and shall not exceed the time limit shown in Table 4. Table 4
C≤80
80C≤120
4006 Enclosure protection level of the pusher
For pushers with enclosure protection level requirements, the following protection levels are recommended: IP40, IP50, IP54, IP55.
7.1.7 Requirements for motors
JB/T6452-1992
7.1.7.1 The motors used in the pushers shall comply with the provisions of GB755 and the specific product standards for special motors. 7.1.7.2 The insulation level of the motors used in the pushers shall not be lower than Class E. 7.2 Performance requirements
7.2.1 Temperature rise
Under the ambient air temperature specified in Article 6.1.1 and the working system specified in Article 5.5, the temperature rise of each part of the pusher shall not be higher than the provisions of Table 3.
Table 3 Temperature rise limit of thruster
Structural type
Oil-type motor thruster
Air-type motor thruster
7.2.2 Dielectric properties
Insulation grade of motor winding
Terminals
7.2.2.1 The dielectric properties of thrusters are specified in the specific product standards. One of the following requirements can be selected: a.
Phenomenon;
The thruster should be able to withstand the AC voltage value of 2Ui+1000V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. In addition to the motor being verified according to the relevant requirements of GB755, the thruster should be able to withstand the AC 2500V (effective value) power frequency withstand voltage test for 1min without breakdown or flashover. b.
1min
7.2.2.2 After the pusher is filled with oil, the cold insulation resistance of the motor winding to the housing shall not be less than 20M0. 7.2.3 Action time characteristics
The full stroke starting (rise) time and full stroke reset (fall) time of the pusher under specified conditions shall not exceed the time upper limit shown in Table 4 according to the rated thrust and stroke of the product. Table 4
C≤80
80C≤120
400800
Fe1250
Fe>1250
Action time characteristics
The upper limit of the action time is divided into two levels, A and B, of which A is a higher requirement and is an indicator that must be achieved when developing new products. 7.2.4)
Maximum thrust
The maximum thrust of the pusher should not be less than 1.25 times the rated thrust. 7.2.5 Action performance
7.2.5.1 Action performance under specified conditions
The piston and push rod of the pusher should be able to operate flexibly in the hydraulic cylinder without sticking. When the impeller rotates, there shall be no carbon friction with other parts. Under the conditions specified in Article 3.1.2, the impeller shall work reliably. 2 Performance under extreme conditions
7. 2. 5. 2
The impeller shall be able to reliably push the rated load equal to the rated thrust to the rated stroke (rated working stroke) under the extreme conditions of Article 3.1.3, and after power failure at 50% of the rated load, its push rod shall be able to reliably return to the starting position. 7.2.6 Service life
Under the conditions specified in Article 3.1.2, the impeller shall operate according to its rated intermittent cycle working system, and the recommended total number of operating cycles (service life) is classified as:
100, 300, 600, 1000, 3000 times. Within the life of the impeller, it is allowed to replace the wearing parts. Replaceable wearing parts shall be specified in the specific product standards. 7.2.7 Performance requirements of derived functions
The performance requirements of derived functions shall be specified in the specific product standards. 8 Test methods
8.1 Verification of structural requirements
The appearance and installation dimensions, markings and grounding devices of the pusher shall be inspected in accordance with the specific product standards. 8.1.1 Aging test of elastic sealing components The elastic sealing components shall be placed in a heated test room with a temperature of 70±2°C, the same atmospheric pressure and composition as the surrounding air, and natural circulation ventilation for testing. Natural air circulation can be achieved by opening holes in the test room wall. The test sample is stored in the heated test room for 10 days and nights (240h). After the test, the test sample shall be placed in an environment with room temperature and relative humidity of 45% to 55% for 24h. The test sample shall not change, that is, there shall be no surface cracking or shrinkage that affects continued use and no material becomes sticky or oily. Note: If the manufacturer adopts equivalent or stricter assessment conditions, this test can also be replaced. 8.1.2 Test of the humidity resistance of the thruster
The humidity resistance test of the thruster is divided into two categories, and the specific product standards should make clear provisions: 8. Test Ca; Constant humidity test, during the test, the temperature is maintained at 40 ± 2 ° C, the relative humidity is maintained within the range of 90% ~ 95%, and the test severity level is 4 days and nights. In the 1~2h before the end of the test, the power frequency withstand voltage test is carried out with a voltage of 2Ui + 1000V or 2000V (the smaller one, the effective value) for 1min. There should be no insulation breakdown or flashover phenomenon, and the insulation resistance is measured with a megohmmeter of the corresponding voltage, which should be not less than 1Mo.
b. Test Db; Alternating humidity test, during the test, the temperature and humidity are alternately changed according to the provisions of Table 5 in each cycle, and the test severity level is 6 cycles. During the 1-2 hours before the end of the test, the power frequency withstand voltage test is carried out with a voltage of 2Ui + 1000V or 2000V (whichever is smaller, effective value) for 1 minute. There should be no insulation breakdown and flashover phenomenon, and the insulation resistance should be not less than 1M0 when measured with a megohmmeter of the corresponding voltage. Note: When carrying out the power frequency withstand voltage test, the motor windings shall be carried out in accordance with the provisions of GB755. Table 5 Alternating damp heat test environmental conditions change regulations Temperature
High temperature and high humidity
Low temperature and high humidity
From room temperature to 40
From 40 to 25±3
Abnormal heat and fire hazard resistance test
Relative humidity
95~100
95~100
95~100
Duration
The abnormal heat and fire hazard resistance test of thruster insulating material parts shall be carried out in accordance with the provisions of GB5169.4, and the following provisions shall be supplemented: For insulating material parts that support or fix the shut-off parts, the test temperature of the top of the glow wire shall be 960±15℃, and the test duration shall be 30±1s;
b. For parts made of insulating materials that do not support current-carrying parts and grounding parts, the test temperature of the top of the glow wire shall be 650±10℃, and the test duration shall be 30±15.
8.1.4 Determination of Comparative Tracking Index (CTI) of Insulating Materials7
JB/T6452-1992
The determination of Comparative Tracking Index (CTI) of Insulating Materials of Pushers shall be carried out in accordance with the test methods, test equipment, test procedures, etc. specified in GB4207. If the pusher manufacturer obtains data from the insulating material manufacturer or other reliable aspects, and it is indeed proved that the CTI value of the insulating material meets the requirements of the specific product standard, it can also replace the determination of the CTI of the insulating material. 8.1.5 Shell protection test of pushers
The shell protection test of pushers shall be carried out in accordance with the relevant provisions of GB4942.2. For products of the same system with the same external sealing structure, this project test is allowed to be carried out only on any one specification of the product, and the specifications of the products submitted for test are specified in the specific product standards. 8.1.6 Terminal test
8.1.6.1 General inspection of terminals
The structure of the terminals shall comply with the requirements of 7.1.3.1, 7.1.3.2 and 7.1.3.3; the letter markings of the terminals shall comply with the provisions of 7.1.3.5.
8.1.6.2 Mechanical strength test of terminals The mechanical strength test of the actuator terminals shall be carried out in accordance with the provisions of 8.1.8.2 of the national standard "General Principles for Low-voltage Switching Equipment and Control Equipment".
8.1.6.3 Accidental loosening and damage test (bending test) of conductors of terminals The accidental loosening and damage test (bending test) of conductors of actuator terminals shall be carried out in accordance with the provisions of 8.1.8.3 of the national standard "General Principles for Low-voltage Switching Equipment and Control Equipment".
8.1.6.4 Pull-out test of terminal
The pull-out test of the terminal of the actuator shall be conducted with round copper wire in accordance with the provisions of Article 8.1.8.4.1 of the national standard "General Rules for Low-voltage Switching Equipment and Control Equipment".
8.1.6.5 Access capacity test of non-prefabricated round copper wire of the maximum specified cross-section of the terminal This test shall be conducted in accordance with the provisions of Article 8.1.8.5 of the national standard "General Rules for Low-voltage Switching Equipment and Control Equipment". 8.1.7 Inspection of electrical clearance and creepage distance
The inspection of electrical clearance and creepage distance shall be conducted in accordance with the method specified in Appendix A of the national standard "General Rules for Low-voltage Switching Equipment and Control Equipment". The inspection parts are between different phases of the terminal and between each phase of the terminal relative to the ground (housing). 8.1.8 Sealing reliability test of actuator
This test is conducted on actuators with sealing requirements. During the test, fill with the specified oil and pressurize with a pressure test pump. The test pressure and test time are specified by the specific product standards. During the pressure test time, check all external seals and the outer wall of the shell. There should be no oil leakage. The leaking oil is not allowed to drip. The indication of the pressure gauge should not decrease during the pressure maintenance process. 8.2 Verification performance requirements
8.2.1 Temperature rise test
Under various working conditions specified in the product standards, the thruster is installed on a matching brake frame for a temperature rise test. 8.2.1.1 Ambient air temperature
The ambient air temperature should be within the range of 10-40℃, and its change should not exceed 10K. 8.2.1.2 Measurement of ambient air temperature
The ambient air temperature chamber shall be measured with at least two temperature detectors (thermometers or thermocouples). The temperature detectors shall be evenly distributed around the test object, placed at half the height of the test object, and about 1m away from the test object. The ambient air temperature shall be measured and recorded at the beginning of the test and in the last quarter of the test cycle or in the last 0.25h (whichever is smaller). The temperature detector shall be free from the shadow of airflow and thermal radiation, as well as display errors caused by rapid temperature changes. 8.2.1.3 Measurement of component temperature rise
a. The oil is measured with a thermometer or thermocouple: b. The motor winding is measured with the resistance method
The calculation formula is:
JB/T6452-1992
R=R(+01)-(01-81)
Where: 6——Ambient air temperature at the beginning of the test, °C; .Temperature rise, K;
①, —Ambient air temperature in the last quarter of the test period or the last 0.25h, °C; Ri——Winding cold resistance, O;
R—Winding hot resistance, O;
—Resistance temperature coefficient of winding conductor material, for copper conductor, when the temperature is 20C, α=234.5. Note: The wiring conductors are made of stranded copper wires with a cut surface of 1mm. The terminals are measured by the thermocouple method.
8.2.2 Dielectric performance test
8.2.2.1 The dielectric performance test of the thruster is carried out with power frequency voltage. When the test voltage is AC 50Hz, 2Ui+1000V (effective value), the whole machine (including the motor) is tested. When the test voltage is AC 50Hz, 2500V (effective value), the motor lead wire must be disconnected from the terminal first (the motor withstand voltage test is carried out in accordance with the provisions of GB1032), and the pressure is applied between the terminals of different phases and between the terminals and the ground (housing). There should be no breakdown or flashover for 1 minute. 8.2.2.2 The insulation resistance test of the thruster is carried out according to its rated working voltage using a megohmmeter of the corresponding voltage level. 8.2.3 Action time characteristic test
The action time characteristic test of the pusher is carried out by the weight method under the conditions specified in Article 7.2.3. The push rod should be kept balanced during the test (avoid lateral force). The test is repeated 3 times, and the results of the 3 tests should not exceed the specified value. 8.2.4 Maximum thrust test
The test piece is installed vertically. Under the conditions of cold state, normal temperature and rated voltage, the maximum weight of the base code pushed when it can reach the rated stroke (rated working stroke) is measured by the weight method. Its value should comply with the provisions of Article 7.2.4. 8.2.5 Action performance test
8.2.5.1 Action performance test under specified conditions The pusher is installed on a matching brake or a corresponding equivalent test track. Under specified conditions, it is powered on and operated for a certain period of time according to its rated number of operating cycles per hour. The piston and push rod of the pusher should move flexibly in the hydraulic cylinder without sticking. When the impeller rotates, there should be no friction with other parts. The pusher works reliably. The time limit of the test operation shall be specified in the specific product standards. 8.2.5.2 Performance test under extreme conditions The pusher is installed on a matching brake for testing, and it should be noted that the pusher should be placed in the test environment for no less than 6 hours before the performance test: a.
High temperature (+40°C) test should be carried out in the hot state of the test piece. Low temperature test is generally assessed at -25°C. During the test, the No. 10 aviation hydraulic oil that meets SY1181 should be injected before the test; e.
During the test, the test piece should be installed with an angle of 15, and start (rise) and reset (fall) according to the conditions specified in Article 7.2.5.2. The number of actions is no less than 20 times.
8.2.6 Life test
Install the pusher on a matching brake for testing. When the number of actions reaches the specified index, the pusher must still be able to continue working and measure its action time characteristics. It is allowed to be 10% wider than the specified value. During the test, it is allowed to replace wearing parts such as dynamic seals, but the minimum number of tests without replacing wearing parts should be specified in the specific product standards. 8.2.7 Derived functional performance test
The test method for derived functional performance of the pusher shall be carried out in accordance with the provisions of the specific product standards. 9 Inspection rules
The test and inspection of the pusher shall be carried out on a new and intact pusher. 9
Classification of inspection and testing
The inspection and testing of the pusher are divided into the following types; a.
Type test;
Periodic test;
Factory inspection.
Type test
9. 1. 1.1
JB/T 6452-1992
Type test of thruster shall be carried out in the following cases: when the prototype trial production of thruster is completed;
when the thruster is converted to repeated trial production; when the structure, material or process of thruster is changed and such change may affect its performance, all or part of the test items of type test shall be evaluated.
Type test items
The type test items of the thruster are:
Inspection of appearance and installation dimensions, markings and grounding devices: aging test for elastic sealing parts;
Moisture resistance test;
Abnormal heat and fire hazard resistance test;
Comparative tracking index (CTI) determination; Shell protection grade test;
Terminal test;
Detection of electrical clearance and electrical distance;
Sealing test;
Temperature rise test;
Dielectric properties test;
Action time characteristic test;
Maximum thrust test;
Action performance test under specified conditions;
Action performance test under limit conditions;
Life test;
Derived function performance test;
Impact and alarm test (if any).
Periodic test
Periodic test is carried out on the thrusters that have entered stable production. The thrusters in stable production are subject to periodic test every 3 to 5 years, and the time interval is specified in the product standard. The periodic test items include:
Inspection of appearance and installation dimensions, markings and grounding devices; detection of electrical clearance and creepage distance;
Sealing test:
Temperature rise test;
Dielectric property test;
Action time characteristic test;
Maximum thrust test:
Action performance test under specified conditions;1
JB/T 6452-1992
The type test of the thruster shall be carried out in the following cases: when the prototype trial production of the thruster is completed;
when the thruster is converted to repeated trial production; when the structure, material or process of the thruster is changed and such change may affect its performance, all or part of the type test items shall be evaluated.
Type test items
The type test items of the thruster are:
Inspection of appearance and installation dimensions, markings and grounding devices: aging test for elastic sealing parts;
Moisture resistance test;
Abnormal heat and fire hazard resistance test;
Comparative tracking index (CTI) determination; Shell protection grade test;
Terminal test;
Detection of electrical clearance and electrical distance;
Sealing test;
Temperature rise test;
Dielectric properties test;
Action time characteristic test;
Maximum thrust test;
Action performance test under specified conditions;
Action performance test under limit conditions;
Life test;
Derived function performance test;
Impact and alarm test (if any).
Periodic test
Periodic test is carried out on the thrusters that have entered stable production. The thrusters in stable production are subject to periodic test every 3 to 5 years, and the time interval is specified in the product standard. The periodic test items include:
Inspection of appearance and installation dimensions, markings and grounding devices; detection of electrical clearance and creepage distance;
Sealing test:
Temperature rise test;
Dielectric property test;
Action time characteristic test;
Maximum thrust test:
Action performance test under specified conditions;1
JB/T 6452-1992
The type test of the thruster shall be carried out in the following cases: when the prototype trial production of the thruster is completed;
when the thruster is converted to repeated trial production; when the structure, material or process of the thruster is changed and such change may affect its performance, all or part of the type test items shall be evaluated.
Type test items
The type test items of the thruster are:
Inspection of appearance and installation dimensions, markings and grounding devices: aging test for elastic sealing parts;
Moisture resistance test;
Abnormal heat and fire hazard resistance test;
Comparative tracking index (CTI) determination; Shell protection grade test;
Terminal test;
Detection of electrical clearance and electrical distance;
Sealing test;
Temperature rise test;
Dielectric properties test;
Action time characteristic test;
Maximum thrust test;
Action performance test under specified conditions;
Action performance test under limit conditions;
Life test;
Derived function performance test;
Impact and alarm test (if any).
Periodic test
Periodic test is carried out on the thrusters that have entered stable production. The thrusters in stable production are subject to periodic test every 3 to 5 years, and the time interval is specified in the product standard. The periodic test items include:
Inspection of appearance and installation dimensions, markings and grounding devices; detection of electrical clearance and creepage distance;
Sealing test:
Temperature rise test;
Dielectric property test;
Action time characteristic test;
Maximum thrust test:
Action performance test under specified conditions;
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