Some standard content:
Mechanical Industry Standard of the People's Republic of China
Marine Bimetallic Thermal Overload Relay
JB/T5806-1991
This standard refers to and adopts IEC92-101 (1980) "Marine Electrical Equipment" Part 101 General Requirements, IEC292-1 (1969), 2921A (1971), 292-1B (1973), 292-1C (1975), the first amendment (1979) "Low Voltage Motor Starters Part 1: AC Direct (Full Voltage) Starters", IEC337-1 (1970), 337-1A (1973), 337-1B (1975) "Control Switches" (Low Voltage Switchgear for Control Circuits and Auxiliary Circuits, including Contactor Relays) Part 1 General Requirements and other relevant contents. Subject content and scope of application
This standard specifies the working conditions, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of JR9 series marine bimetallic thermal overload relays (hereinafter referred to as thermal relays). This standard applies to thermal relays with a voltage of 660V or less, AC 50IIz or 60IIz, and a current of up to 630A. 2 Reference standards
GB1497
GB2423.16
GB2423.17
GB2900.18
GB4207
GB7094
Basic test methods for low-voltage electrical appliances
Basic standards for low-voltage electrical appliances
Basic environmental test procedures for electric and electronic products Test A: Low temperature test method Basic environmental test procedures for electric and electronic products Test Db: Alternating damp heat test method Basic environmental test procedures for electric and electronic products Test J: Long-term test method Star test Ka: Salt spray test method
Basic environmental test procedures for electric and electronic products Electrical terminology Basic terminology
Electrical terminology Low-voltage electrical appliances
Determination method of comparative tracking index and proof tracking index of solid insulating materials under humid conditions. Vibration (sinusoidal) test methods for marine electrical equipment Low-voltage motor starters Part 1 AC direct (full voltage) starters 3 Terms, symbols and codes
3.1 Terms and their definitions:
3.1.1 Setting current
The reference current of the thermal relay operating characteristics can be adjusted. 3.1.2 Setting current range
The setting current can be adjusted to a range between the maximum and minimum values. 3.1.3 Overload protection
The thermal relay protects electrical equipment against loads exceeding its rated load. 3.1.4 Phase failure protection
The thermal relay protects electrical equipment against a circuit breaker in any phase of the three-phase input. 3.1.5 Fusing short-circuit current
Approved by the Ministry of Machinery and Electronics Industry on October 15, 1991, 178bzxz.net
Implementation on October 1, 1992, JB/T5806—1991
When the short-circuit protection device (SCPD) is a fuse, the limiting short-circuit current at this time is called the fusing short-circuit current. 3.1.6 Pollution level
The pollution level is a classification of environmental conditions based on the amount of conductive or hygroscopic dust, free gas or salts and relative humidity, as well as the frequency of surface resistivity reduction events due to moisture absorption or condensation. 3.1.7 Installation category (overvoltage category)
For electrical appliances or equipment installed in low-voltage systems with matched insulation. According to its rated insulation voltage to ground (U), its peak value of impulse withstand voltage to ground is specified accordingly, that is, its installation category (or overvoltage category). The installation category is based on the protection of the transient overvoltage suppression device. The transient voltage breakdown value of the transient overvoltage suppression device should be equal to the impulse withstand voltage priority value of the specified installation category (overvoltage category).
3.2Except for Article 3.1, the remaining terms and their definitions shall comply with the provisions of GB2900.1 and GB2900.18. 3.3 Symbols and codes
3.3.1 Symbol
Rated insulation voltage (effective value);
Rated working voltage;
Rated working current;
Conventional thermal current;
Power factor
3.3.2 Code
AC—11 controls AC electromagnet load;
DC—11 controls DC electromagnet load.
4 Classification
4.1 Model and specifications
4.1.1 Model and its meaning
Code for phase failure protection device 3D
Code for no phase failure protection device 3
Basic specification code, design serial number expressed by rated working current value
Thermal relay
4.1.2 Basic parameters
4.1.2.1 See Table 1 for the rated insulation voltage, rated working current and setting current range of thermal element of thermal relay. 4.1.2.2 Rated working system
a. Eight-hour working system;
b. Uninterrupted working system;
c. Intermittent cycle working system.
4.1.2.3 Auxiliary circuit
Basic parameters of auxiliary contacts are shown in Table 2
Rated insulation
Voltage U
Rated working
Current
Thermal element
Setting current
Current range
JR9--12.5
0.16~0.25
Rated insulation voltage
1 normally open, 1 normally closed
4.2 Type
|JR9O-25
0.16~0.25
1 conversion
with phase failure protection;
with temperature compensation;
JR9—32
JB/T5806—1991
JR9-63
JR9-80
0.16~0.25
conventional heating current
rated working
voltage,
JR9-- 180 | | tt | 0~250
200~320
250~400
JR9-630||tt ||320~500
400~630
Rated working
Rated working
Current 1,
Protection type is Type 1 (see JB2458.1); with trip indication;
JB/T58061991
With a disconnection test button for manually disconnecting the normally closed contact; with a set current adjustment device;
With electrically insulated normally closed and normally open contacts: with manual reset and automatic reset.
4.3 Classification
According to whether there is a special matching current transformer
With a special matching current transformer;
Without a special matching current transformer.
According to the protection function
Over-cut protection;
Phase failure protection.
According to the reset mode, it can be divided into
manual reset;
automatic reset;
automatic and manual reset.
According to the action indication, it can be divided into
with action indication;
without action indication.
According to the installation mode, it can be divided into
single installation;
single installation and guide rail installation;
combined installation.
4.4 Overall dimensions and installation dimensions
For overall dimensions and installation dimensions, see Figures 1 to 7 and Table 395
Figure 1JR9--12.5 thermal relay
Figure 2JR9--25 thermal relay
Lei Luyou
JR9-32 thermal relay
Figure 5JR9C
80 thermal relay
JR9-400 (thermal element setting current range
80~125, 125~200A）
JB/T5806—1991
-63 type thermal relay
Figure 4JR9--
Figure 6JR9-180 type thermal relay
JR9-630 type thermal relay
JR9-400 (thermal element setting current range 160~250, 200~320, 250～400A)
JR9O-630
5 Technical requirements
5.1 Normal working conditions
JB/T5806—1991
5.1.1 The thermal relay shall work normally under the environmental conditions specified in Table 4 5.1.2 Pollution level
The pollution level is level 3
5.1.3 Installation category (overvoltage category)
Installation category!
5.2 Structural requirements
5.2.1 The thermal relay shall be manufactured according to the drawings and technical documents approved by the prescribed procedures. Table
Environmental conditions
Maximum ambient air temperature
Minimum ambient air temperature
Effect of humid air at sea
Effect of salt spray
Effect of ammonia bacteria
Impact"
Note: 1)
refers to the impact generated during normal operation of the ship. Rated data
+45℃
-25℃
≤22.5°
The structural material of the thermal relay should have sufficient mechanical strength and be resistant to low temperature, humidity and heat. 5.2.2
5.2.3 The connectors and fasteners of the thermal relay should have measures to prevent them from loosening due to vibration. 5.2.4 The metal of the thermal relay In addition to having good corrosion resistance, metal parts should have a reliable protective layer. 5.2.5 The insulation parts of thermal relays should be made of durable, flame-retardant, moisture-resistant and frost-resistant materials. Toxic materials and materials that can release toxic gases must not be used. The insulation group used should be at least Ⅱa and its CTI value should not be less than 175. 5.2.6 The electrical clearance and creepage distance of thermal relays should comply with the provisions of Article 7.1.3 of GB1497. 5.3 Performance requirements
5.3.1 Dielectric properties
5.3.1.1 Power withstand voltage
The main circuit of the thermal relay and the auxiliary circuit connected to the main circuit should be able to withstand a power frequency withstand voltage test of 2500V (AC effective value) for 1min.
For auxiliary circuits not connected to the main circuit, they should be able to withstand a 2320V (AC effective value) 1min power frequency withstand voltage test, and contacts with a separation distance of less than 1mm should be able to withstand a 1200V (AC effective value) 1min power frequency withstand voltage test. 5.3.1.2 Impact withstand voltage
When the electrical clearance value of the thermal relay is less than the value in Table 5 of GB1497, the impact withstand voltage test shall be carried out in accordance with Article 8.2.2.3.1 of GB1497.
5.3.2 Limit allowable temperature rise
The thermal relay shall be subjected to the limit allowable temperature rise test under the conditions specified in Article 6.3.2. The measured temperature rise shall not exceed the provisions of Table 5. 183
Components and material types| |tt||Insulated wire enclosure
Connection terminals connected to external insulated wires
Manual operating parts
JB/T5806—1991
Limited allowable temperature rise
B-grade insulating materials
F-grade insulating materials
Silver and silver-based alloys
With silver or nickel anti-corrosion layer
With tin anti-corrosion layer
Insulating materials
5.3.3 Action characteristics
5.3.3.1 The action characteristics when the load of each phase is balanced shall comply with the provisions of Table 6. Table 6
Rated current multiples
Action time
No action within 2h
<2 min
Starting conditions
After test of sequence 1
Measurement method
Resistance method
Thermocouple method
Thermometer or thermocouple method
Ambient air temperature
5.3.3.2 Action characteristics when the load on each phase is unbalanced The action characteristics when the load on each phase of a thermal relay without phase failure protection is unbalanced (two phases are energized) shall comply with the provisions of Table 7. a.
Setting current multiple
Any two phases
Third phase
Action time
No action within 2h
Starting conditions
After test of sequence 1
Ambient air temperature
The action characteristics when the load on each phase of a thermal relay with phase failure protection is unbalanced (phase failure) shall comply with the provisions of Table 8. Table 8
Set current multiple
Any two phases
Temperature compensation characteristics
Third phase
Action time
No action within 2h
The temperature compensation characteristics of the thermal relay shall comply with the provisions of Table 9. 184
Starting conditions
After sequence 1 test
Ambient air temperature
Set current multiple
JB/T5806—1991
Action time
No action within 2h
No action within 2h
Starting conditions
After sequence 1 test
After sequence 3 test
Ambient air temperature
When the ambient air temperature is +45~+60℃, the set current multiple of sequence 1 in Table 9 can be reduced by 5 for every 1℃ increase in temperature. When the ambient air temperature is -25~-5℃, the set current multiple of sequence 4 in Table 9 can be increased by 5 for every 1℃ decrease in temperature.3.+Reset performance
The thermal relay should be able to reset reliably after normal action. For thermal relays with rated working current of 63A and below, the automatic reset time shall not exceed 5 minutes. For thermal relays with rated working current greater than 63A, the automatic reset time shall not exceed 8 minutes. The manual reset time of thermal relays shall not exceed 2 minutes.
5.3.5 Overload current tolerance
When the thermal relay is adjusted to the maximum setting current, a current with a multiple of the limit overload current in Table 10 is passed through. The thermal relay shall be able to operate reliably 5 times without damage. The interval between each operation time is the automatic reset time of the thermal relay. Table 10
Maximum setting current of thermal element
Multiple of limit overload current
5.3.6 Auxiliary contact performance
5.3.6.1 Making and breaking capacity of auxiliary contact ≤100
The auxiliary contact of the thermal relay shall be able to make and break the voltage and current under abnormal use conditions listed in Table 11. Table 11
Current type Use category
Auxiliary contact electrical life
Auxiliary contact electrical life according to the normal use conditions listed in Table 11, the number of times is 6000. Use
5.3.6.3 Rated short-circuit current of auxiliary contact When the auxiliary circuit of the thermal relay is protected by a 6A fuse, the auxiliary contact should be able to withstand the assessment of the rated short-circuit current of 1000A, the test voltage is 1.1U., and the power factor is 0.5~0.7. 5.3.7 Mechanical life
The mechanical life of the action mechanism, reset mechanism and auxiliary contact of the thermal relay should not be less than 10000 times. 5.3.8 Overload protection times
JB/T5806—1991
The overload protection times of the thermal relay shall not be less than 1000 times, in which each time the overload current is passed simultaneously to the thermal relay to make it operate, and then it should be able to be reset manually or automatically.
5.3.9 Time-current characteristics
The time-current characteristics of the thermal relay shall be provided in the form of a curve cluster and included in the product manual. These curves shall indicate the relationship between the time and current of the thermal relay from the cold state to at least 8 times the set current. 5.3.10 Coordination with short-circuit protection devices (SCPD). The SCPD shall be installed on the power supply side. Its short-circuit breaking capacity shall not be less than the expected short-circuit current at the installation point. Within the normal operating current range of the thermal relay (including the starting, reversing and blocking of the motor), the SCPD shall not operate and the time it can withstand these currents shall be at least equal to the operating time of the corresponding thermal relay.
The coordination type adopts "a" type and "C" type. Their current values shall be indicated in the product manual. "a" type - allows any form of damage to the thermal relay itself. "C" type does not allow permanent changes in the characteristics of the thermal relay. Moisture resistance
After the thermal relay has been subjected to 2 cycles of 55℃ alternating damp heat test, its performance shall comply with the provisions of Table 12, and the action performance test shall comply with the provisions of No. 1 and No. 2 in Table 6 of Article 5.3.3.1. The product appearance shall not have deformation and cracks. Table 12
Voltage level of megohmmeter
5.3.12 Mildew resistance
Before damp heat test
Insulation resistance
After damp heat test
The thermal relay shall have moisture resistance. After the mildew test, the area of the insulating parts exposed to the air shall not exceed the second level mildew specified in GB2423.16.
5.3.13 Salt spray resistance
The thermal relay shall have salt spray resistance. After the salt spray test, the appearance change shall comply with the provisions of Table 13. The test cycle is 48h. Table 13
Coating categories
Zinc, cadmium
5.3.14 Low temperature resistance
Steel and copper alloy
Steel and copper alloy
Qualification requirements
No white or gray-black corrosion on the main surface No gray or light green corrosion on the main surface No patina on the main surface
The thermal relay shall be tested at an ambient air temperature of -25℃ and can still work reliably after the test. 5.3.15 Vibration resistance
The thermal relay shall have vibration resistance. The alarm parameters shall be in accordance with Table 14. During the alarm test, there shall be no mechanical damage and malfunction, and the change in the set current value shall not exceed ±15%.
Rated rate range
Tilt and swing resistance
Displacement±1mm
Acceleration±0.7g
JB/T5806—1991
When the thermal relay is tilted at 22.5 and the swing test is carried out, the change of its set current value shall not exceed 15%. 6 Test method
6.1 General test conditions
The test method of thermal relay shall be carried out in accordance with GB998 unless otherwise specified in this standard. Each test shall be carried out on a clean and new product. All tests shall be carried out at the rated power supply frequency. The thermal relay shall be installed in the normal position specified in the product manual. For test items with heat influence, such as action characteristics, temperature rise and other tests, the distance between two adjacent thermal relays shall not be less than 100mm. 6.2 Verification structure requirements
The determination of the comparative tracking index (CTI value) of the insulating material shall be carried out in accordance with the provisions of GB4207. 6.3 Verification performance requirements
6.3.1 Dielectric performance test
6.3.1.1 Power frequency withstand voltage test
The power frequency withstand voltage test method shall be carried out in accordance with the relevant provisions of Articles 6.1, 6.3.1 and 6.3.5 of GB998. 6.3.1.2 Impulse withstand voltage test
When the location of the impulse withstand voltage test is different from the altitude of 2000m, it shall be carried out in accordance with Article 8.2.2.3.1 of GB1497. a.
The peak value of the impulse withstand voltage shall be multiplied by the correction factor;
b. The application location of the impulse voltage is the same as Article 6.3.1.1; c. During the impulse withstand voltage test, the positive and negative polarity impulse voltages shall be applied 3 times each (6 times in total), with an interval of at least 1s each; d. The judgment of the test results is the same as Article 6.3.1.1.
6.3.2 Temperature rise test
6.3.2.1 The temperature rise test shall be carried out in accordance with the relevant provisions of Articles 5.1 and 5.2 of GB998. 6.3.2.2 It is allowed for the phases of the thermal relay to be connected in series and tested with a single-phase power supply, but for thermal relays with dedicated matching current transformers, a three-phase power supply shall be used for the test. If it is verified to be equivalent, a single-phase power supply may also be used for the test. 6.3.2.3 Selection of the cross-section and length of the connecting wire For thermal relays with a set current of 400A or less, the temperature rise test connecting wire shall be made of polyoxyethylene (PVC) insulated copper wire or a.
copper cable. The selection of the connecting wire shall be in accordance with Table 15 Table 15
Maximum setting current
Yi area
Minimum length between two terminals
Maximum setting current
Yi area
Between two terminals Minimum length
≤117
≤147
≤180
≤216
≤250
≤287
≤334
≤400
For thermal relays with a set current greater than 400A and less than or equal to 630A, the temperature rise test should be for copper busbars or polyvinyl chloride 187
(PVC) insulated copper cables, selected according to Table 16. Copper
Maximum setting current
400<≤500
500<≤630
JB/T5806—1991
Yi area
6.3.2.4 The temperature rise test can be carried out on the thermal element with the largest setting current in each type of thermal relay. 6.3.2.5 Judgment of test results
The temperature rise of each tested component of the thermal relay is not higher than the limit temperature rise specified in Table 5 of Article 5.3.2, then the test is considered to be qualified. Between two terminals
Minimum length
6.3.3 Action characteristic test
6.3.3.1 The action characteristic test should be carried out under the condition that the ambient air temperature is 20℃. The deviation of the indoor air temperature during the test should not exceed ±5℃.
The selection of connecting wires for the action characteristic test is the same as that in 6.3.2.3. Before the test, the test piece should be placed at the specified ambient air temperature for at least 2 hours before the power-on test can be carried out.
During the test, the deviation of the set current value indicated by the set current adjustment cam should not exceed ±2.5%. For the same set current, the deviation should be a unidirectional deviation.
6.3.3.2 The action characteristic test when the load of each phase is balanced can be carried out at the minimum, maximum and any intermediate current scale value of the thermal element. The action characteristic test when the load of each phase is unbalanced can be carried out at the minimum and maximum current scale values of the thermal element. 6.3.4 Temperature compensation characteristic test
6.3.4.1 The temperature compensation characteristic test shall be carried out in a thermostatic box or a low temperature box that reaches the specified temperature. The volume of the test box shall not be less than 30 times the total volume of the test object. During the test, the air temperature deviation in the test box shall not exceed ±2°C. The selection of the test connection wire is the same as that in 6.3.2.3. Before the test, the test object shall be placed in the box at the specified test temperature for a preset time of not less than 2 hours. During the temperature compensation test, when increasing the current to test the hot action characteristic, the heating system of the thermostatic box or the cooling system of the low temperature box shall be turned off first to avoid affecting the test results. 6.3.4.2 The temperature compensation test is carried out at the minimum and maximum setting currents of the thermal element. The deviation of the setting current indicated by the current adjustment cam shall not exceed ±2.5%. For the same setting current scale, the deviation shall be a unidirectional deviation. 6.3.5 Reset performance test
The reset performance test can be carried out at the same time when the thermal relay is set at the minimum current value and the high temperature test during the temperature compensation test. 6.3.6 Overload current tolerance test
6.3.6.1 Overload current tolerance test can be carried out after the thermal relay is connected with the corresponding current level AC contactor, or it can be carried out on a separate thermal relay.
6.3.6.2 The selection of test sample connection wire is the same as 6.3.2.3. The ambient air temperature is within the range of 1040℃. The test current should be pre-adjusted and kept stable. The first test starts from the cold state. The time interval between subsequent tests should be as short as possible, that is, it should be carried out immediately after the thermal relay is reset, and the main circuit power supply should be cut off immediately after each action. 6.3.6.3 For thermal relays of the same model, if the thermal element structure is the same, if it is verified to be equivalent, it is allowed to select several thermal elements for testing, but the thermal elements with the largest and smallest specifications in the thermal relay of this level must be included. For thermal relays with special matching current transformers, only the matching thermal relays can be tested for overload current tolerance. 6.3.6.4 After the test, if the test sample meets the following requirements, the test is qualified. a. The thermal element is not burned;
b. The thermal relay starts from the cold state and passes 2 times the maximum setting current. It should be able to operate and reset. 6.3.7 Auxiliary contact connection and disconnection capacity test 1881 General test conditions
The test methods of thermal relays shall be carried out in accordance with GB998 unless otherwise specified in this standard. Each test shall be carried out on a clean, new product. All tests shall be carried out at the rated power supply frequency. Thermal relays shall be installed in the normal position specified in the product manual. For test items with heating effects, such as action characteristics, temperature rise and other tests, the distance between two adjacent thermal relays shall not be less than 100mm. 6.2 Verification of structural requirements
The determination of the comparative tracking index (CTI value) of insulating materials shall be carried out in accordance with GB4207. 6.3 Verification of performance requirements
6.3.1 Dielectric performance test
6.3.1.1 Power frequency withstand voltage test
The power frequency withstand voltage test method shall be carried out in accordance with the relevant provisions of Articles 6.1, 6.3.16.3.5 of GB998. 6.3.1.2 Impulse voltage test
When the location of the impulse voltage test is different from the altitude of 2000m, the provisions of 8.2.2.3.1 of GB1497 shall apply. a.
The peak value of the impulse voltage shall be multiplied by the correction factor; b. The location of the impulse voltage application is the same as that of 6.3.1.1; c. During the impulse voltage test, the positive and negative polarity impulse voltages shall be applied 3 times each (6 times in total), with an interval of at least 1s each; d. The test result shall be judged in the same way as that of 6.3.1.1.
6.3.2 Temperature rise test
6.3.2.1 The temperature rise test shall be carried out in accordance with the relevant provisions of 5.1 and 5.2 of GB998. 6.3.2.2 It is allowed that each phase of the thermal relay is connected in series and tested with a single-phase power supply, but for thermal relays with special matching current transformers, a three-phase power supply shall be used for the test. If it is verified to be equivalent, a single-phase power supply may also be used for the test. 6.3.2.3 Selection of connecting wire cross-section and length For thermal relays with a set current of 400A or less, the temperature rise test connecting wire should be made of polyoxyethylene (PVC) insulated copper wire or a.
copper cable. The selection of connecting wire is based on Table 15 Table 15
Maximum setting current
Yi area
Minimum length between two terminals
Maximum setting current
Yi area
Between two terminals Minimum length
≤117
≤147
≤180
≤216
≤250
≤287
≤334
≤400
For thermal relays with a set current greater than 400A and less than or equal to 630A, the temperature rise test should be for copper busbars or polyvinyl chloride 187
(PVC) insulated copper cables, selected according to Table 16. Copper
Maximum setting current
400<≤500
500<≤630
JB/T5806—1991
Yi area
6.3.2.4 The temperature rise test can be carried out on the thermal element with the largest setting current in each type of thermal relay. 6.3.2.5 Judgment of test results
The temperature rise of each tested component of the thermal relay is not higher than the limit temperature rise specified in Table 5 of Article 5.3.2, then the test is considered to be qualified. Between two terminals
Minimum length
6.3.3 Action characteristic test
6.3.3.1 The action characteristic test should be carried out under the condition that the ambient air temperature is 20℃. The deviation of the indoor air temperature during the test should not exceed ±5℃.
The selection of connecting wires for the action characteristic test is the same as that in 6.3.2.3. Before the test, the test piece should be placed at the specified ambient air temperature for at least 2 hours before the power-on test can be carried out.
During the test, the deviation of the set current value indicated by the set current adjustment cam should not exceed ±2.5%. For the same set current, the deviation should be a unidirectional deviation.
6.3.3.2 The action characteristic test when the load of each phase is balanced can be carried out at the minimum, maximum and any intermediate current scale value of the thermal element. The action characteristic test when the load of each phase is unbalanced can be carried out at the minimum and maximum current scale values of the thermal element. 6.3.4 Temperature compensation characteristic test
6.3.4.1 The temperature compensation characteristic test shall be carried out in a thermostatic box or a low temperature box that reaches the specified temperature. The volume of the test box shall not be less than 30 times the total volume of the test object. During the test, the air temperature deviation in the test box shall not exceed ±2°C. The selection of the test connection wire is the same as that in 6.3.2.3. Before the test, the test object shall be placed in the box at the specified test temperature for a preset time of not less than 2 hours. During the temperature compensation test, when increasing the current to test the hot action characteristic, the heating system of the thermostatic box or the cooling system of the low temperature box shall be turned off first to avoid affecting the test results. 6.3.4.2 The temperature compensation test is carried out at the minimum and maximum setting currents of the thermal element. The deviation of the setting current indicated by the current adjustment cam shall not exceed ±2.5%. For the same setting current scale, the deviation shall be a unidirectional deviation. 6.3.5 Reset performance test
The reset performance test can be carried out at the same time when the thermal relay is set at the minimum current value and the high temperature test during the temperature compensation test. 6.3.6 Overload current tolerance test
6.3.6.1 Overload current tolerance test can be carried out after the thermal relay is connected with the corresponding current level AC contactor, or it can be carried out on a separate thermal relay.
6.3.6.2 The selection of test sample connection wire is the same as 6.3.2.3. The ambient air temperature is within the range of 1040℃. The test current should be pre-adjusted and kept stable. The first test starts from the cold state. The time interval between subsequent tests should be as short as possible, that is, it should be carried out immediately after the thermal relay is reset, and the main circuit power supply should be cut off immediately after each action. 6.3.6.3 For thermal relays of the same model, if the thermal element structure is the same, if it is verified to be equivalent, it is allowed to select several thermal elements for testing, but the thermal elements with the largest and smallest specifications in the thermal relay of this level must be included. For thermal relays with special matching current transformers, only the matching thermal relays can be tested for overload current tolerance. 6.3.6.4 After the test, if the test sample meets the following requirements, the test is qualified. a. The thermal element is not burned;
b. The thermal relay starts from the cold state and passes 2 times the maximum setting current. It should be able to operate and reset. 6.3.7 Auxiliary contact connection and disconnection capacity test 1881 General test conditions
The test methods of thermal relays shall be carried out in accordance with GB998 unless otherwise specified in this standard. Each test shall be carried out on a clean, new product. All tests shall be carried out at the rated power supply frequency. Thermal relays shall be installed in the normal position specified in the product manual. For test items with heating effects, such as action characteristics, temperature rise and other tests, the distance between two adjacent thermal relays shall not be less than 100mm. 6.2 Verification of structural requirements
The determination of the comparative tracking index (CTI value) of insulating materials shall be carried out in accordance with GB4207. 6.3 Verification of performance requirements
6.3.1 Dielectric performance test
6.3.1.1 Power frequency withstand voltage test
The power frequency withstand voltage test method shall be carried out in accordance with the relevant provisions of Articles 6.1, 6.3.16.3.5 of GB998. 6.3.1.2 Impulse voltage test
When the location of the impulse voltage test is different from the altitude of 2000m, the provisions of 8.2.2.3.1 of GB1497 shall apply. a.
The peak value of the impulse voltage shall be multiplied by the correction factor; b. The location of the impulse voltage application is the same as that of 6.3.1.1; c. During the impulse voltage test, the positive and negative polarity impulse voltages shall be applied 3 times each (6 times in total), with an interval of at least 1s each; d. The test result shall be judged in the same way as that of 6.3.1.1.
6.3.2 Temperature rise test
6.3.2.1 The temperature rise test shall be carried out in accordance with the relevant provisions of 5.1 and 5.2 of GB998. 6.3.2.2 It is allowed that each phase of the thermal relay is connected in series and tested with a single-phase power supply, but for thermal relays with special matching current transformers, a three-phase power supply shall be used for the test. If it is verified to be equivalent, a single-phase power supply may also be used for the test. 6.3.2.3 Selection of connecting wire cross-section and length For thermal relays with a set current of 400A or less, the temperature rise test connecting wire should be made of polyoxyethylene (PVC) insulated copper wire or a.
copper cable. The selection of connecting wire is based on Table 15 Table 15
Maximum setting current
Yi area
Minimum length between two terminals
Maximum setting current
Yi area
Between two terminals Minimum length
≤117
≤147
≤180
≤216
≤250
≤287
≤334
≤400
For thermal relays with a set current greater than 400A and less than or equal to 630A, the temperature rise test should be for copper busbars or polyvinyl chloride 187
(PVC) insulated copper cables, selected according to Table 16. Copper
Maximum setting current
400<≤500
500<≤630
JB/T5806—1991
Yi area
6.3.2.4 The temperature rise test can be carried out on the thermal element with the largest setting current in each type of thermal relay. 6.3.2.5 Judgment of test results
The temperature rise of each tested component of the thermal relay is not higher than the limit temperature rise specified in Table 5 of Article 5.3.2, then the test is considered to be qualified. Between two terminals
Minimum length
6.3.3 Action characteristic test
6.3.3.1 The action characteristic test should be carried out under the condition that the ambient air temperature is 20℃. The deviation of the indoor air temperature during the test should not exceed ±5℃.
The selection of connecting wires for the action characteristic test is the same as that in 6.3.2.3. Before the test, the test piece should be placed at the specified ambient air temperature for at least 2 hours before the power-on test can be carried out.
During the test, the deviation of the set current value indicated by the set current adjustment cam should not exceed ±2.5%. For the same set current, the deviation should be a unidirectional deviation.
6.3.3.2 The action characteristic test when the load of each phase is balanced can be carried out at the minimum, maximum and any intermediate current scale value of the thermal element. The action characteristic test when the load of each phase is unbalanced can be carried out at the minimum and maximum current scale values of the thermal element. 6.3.4 Temperature compensation characteristic test
6.3.4.1 The temperature compensation characteristic test shall be carried out in a thermostatic box or a low temperature box that reaches the specified temperature. The volume of the test box shall not be less than 30 times the total volume of the test object. During the test, the air temperature deviation in the test box shall not exceed ±2°C. The selection of the test connection wire is the same as that in 6.3.2.3. Before the test, the test object shall be placed in the box at the specified test temperature for a preset time of not less than 2 hours. During the temperature compensation test, when increasing the current to test the hot action characteristic, the heating system of the thermostatic box or the cooling system of the low temperature box shall be turned off first to avoid affecting the test results. 6.3.4.2 The temperature compensation test is carried out at the minimum and maximum setting currents of the thermal element. The deviation of the setting current indicated by the current adjustment cam shall not exceed ±2.5%. For the same setting current scale, the deviation shall be a unidirectional deviation. 6.3.5 Reset performance test
The reset performance test can be carried out at the same time when the thermal relay is set at the minimum current value and the high temperature test during the temperature compensation test. 6.3.6 Overload current tolerance test
6.3.6.1 Overload current tolerance test can be carried out after the thermal relay is connected with the corresponding current level AC contactor, or it can be carried out on a separate thermal relay.
6.3.6.2 The selection of test sample connection wire is the same as 6.3.2.3. The ambient air temperature is within the range of 1040℃. The test current should be pre-adjusted and kept stable. The first test starts from the cold state. The time interval between subsequent tests should be as short as possible, that is, it should be carried out immediately after the thermal relay is reset, and the main circuit power supply should be cut off immediately after each action. 6.3.6.3 For thermal relays of the same model, if the thermal element structure is the same, if it is verified to be equivalent, it is allowed to select several thermal elements for testing, but the thermal elements with the largest and smallest specifications in the thermal relay of this level must be included. For thermal relays with special matching current transformers, only the matching thermal relays can be tested for overload current tolerance. 6.3.6.4 After the test, if the test sample meets the following requirements, the test is qualified. a. The thermal element is not burned;
b. The thermal relay starts from the cold state and passes 2 times the maximum setting current. It should be able to operate and reset. 6.3.7 Auxiliary contact connection and disconnection capacity test 1884 The temperature rise test can be carried out on the thermal element with the largest setting current in each type of thermal relay. 6.3.2.5 Judgment of test results
If the temperature rise of each tested component of the thermal relay is not higher than the limit temperature rise specified in Table 5 of Article 5.3.2, the test is considered to be qualified.
Minimum length between two terminals
6.3.3 Action characteristic test
6.3.3.1 The action characteristic test shall be carried out under the condition of an ambient air temperature of 20℃. The deviation of the indoor air temperature during the test shall not exceed ±5℃.
The selection of connecting wires for the action characteristic test is the same as that of Article 6.3.2.3. Before the test, the test piece shall be placed at the specified ambient air temperature for at least 2h before the power-on test can be carried out.
During the test, the deviation of the set current value shown by the set current adjustment cam shall not exceed ±2.5%. For the same set current, the deviation shall be a unidirectional deviation.
6.3.3.2 The action characteristics when the load of each phase is balanced can be tested at the minimum, maximum and any intermediate current scale value of the thermal element. The action characteristics test when the load of each phase is unbalanced can be tested at the minimum and maximum current scale values of the thermal element. 6.3.4 Temperature compensation characteristic test
6.3.4.1 The temperature compensation test should be carried out in a constant temperature box or a low temperature box that reaches the specified temperature. The volume of the test box should not be less than 30 times the total volume of the test product. During the test, the air temperature deviation in the test box should not exceed ±2°C. The selection of the test connection wire is the same as that of 6.3.2.3. Before the test, the test product should be placed in the box at the specified test temperature for a preset time of not less than 2 hours. During the temperature compensation test, when increasing the current to test the hot action characteristics, the heating system of the constant temperature box or the cooling system of the low temperature box should be turned off first to avoid affecting the test results. 6.3.4.2 The temperature compensation test is carried out at the minimum and maximum set currents of the thermal element. The deviation of the set current indicated by the current regulating cam shall not exceed ±2.5%. For the same set current scale, the deviation shall be a unidirectional deviation. 6.3.5 Reset performance test
The reset performance test can be carried out when the thermal relay is set at the minimum current value and the high temperature test is carried out simultaneously during the temperature compensation test. 6.3.6 Overload current tolerance test
6.3.6.1 The overload current tolerance test can be carried out after the thermal relay is connected to the corresponding current level AC contactor, or it can be carried out on a separate thermal relay.
6.3.6.2 The selection of the test sample connection wire is the same as that of 6.3.2.3. The ambient air temperature is within the range of 1040℃. The test current should be pre-adjusted and kept stable. The first test starts from the cold state. The time interval between subsequent tests should be as short as possible, that is, it should be carried out immediately after the thermal relay is reset, and the main circuit power supply should be cut off immediately after each action. 6.3.6.3 For the same type of thermal relay, if the thermal element structure is the same, if it is verified to be equivalent, it is allowed to select several thermal elements for testing, but it must include the thermal elements of the largest and smallest specifications in the thermal relay of this grade. For thermal relays with special matching current transformers, only the matching thermal relays can be tested for overload current tolerance. 6.3.6.4 After the test, if the test product meets the following requirements, the test is qualified. a. The thermal element is not burned;
b. The thermal relay starts from the cold state and passes 2 times the maximum setting current. It should be able to operate and reset. 6.3.7 Auxiliary contact connection and disconnection capacity test 1884 The temperature rise test can be carried out on the thermal element with the largest setting current in each type of thermal relay. 6.3.2.5 Judgment of test results
If the temperature rise of each tested component of the thermal relay is not higher than the limit temperature rise specified in Table 5 of Article 5.3.2, the test is considered to be qualified.
Minimum length between two terminals
6.3.3 Action characteristic test
6.3.3.1 The action characteristic test shall be carried out under the condition of an ambient air temperature of 20℃. The deviation of the indoor air temperature during the test shall not exceed ±5℃.
The selection of connecting wires for the action characteristic test is the same as that of Article 6.3.2.3. Before the test, the test piece shall be placed at the specified ambient air temperature for at least 2h before the power-on test can be carried out.
During the test, the deviation of the set current value shown by the set current adjustment cam shall not exceed ±2.5%. For the same set current, the deviation shall be a unidirectional deviation.
6.3.3.2 The action characteristics when the load of each phase is balanced can be tested at the minimum, maximum and any intermediate current scale value of the thermal element. The action characteristics test when the load of each phase is unbalanced can be tested at the minimum and maximum current scale values of the thermal element. 6.3.4 Temperature compensation characteristic test
6.3.4.1 The temperature compensation test should be carried out in a constant temperature box or a low temperature box that reaches the specified temperature. The volume of the test box should not be less than 30 times the total volume of the test product. During the test, the air temperature deviation in the test box should not exceed ±2°C. The selection of the test connection wire is the same as that of 6.3.2.3. Before the test, the test product should be placed in the box at the specified test temperature for a preset time of not less than 2 hours. During the temperature compensation test, when increasing the current to test the hot action characteristics, the heating system of the constant temperature box or the cooling system of the low temperature box should be turned off first to avoid affecting the test results. 6.3.4.2 The temperature compensation test is carried out at the minimum and maximum set currents of the thermal element. The deviation of the set current indicated by the current regulating cam shall not exceed ±2.5%. For the same set current scale, the deviation shall be a unidirectional deviation. 6.3.5 Reset performance test
The reset performance test can be carried out when the thermal relay is set at the minimum current value and the high temperature test is carried out simultaneously during the temperature compensation test. 6.3.6 Overload current tolerance test
6.3.6.1 The overload current tolerance test can be carried out after the thermal relay is connected to the corresponding current level AC contactor, or it can be carried out on a separate thermal relay.
6.3.6.2 The selection of the test sample connection wire is the same as that of 6.3.2.3. The ambient air temperature is within the range of 1040℃. The test current should be pre-adjusted and kept stable. The first test starts from the cold state. The time interval between subsequent tests should be as short as possible, that is, it should be carried out immediately after the thermal relay is reset, and the main circuit power supply should be cut off immediately after each action. 6.3.6.3 For the same type of thermal relay, if the thermal element structure is the same, if it is verified to be equivalent, it is allowed to select several thermal elements for testing, but it must include the thermal elements of the largest and smallest specifications in the thermal relay of this grade. For thermal relays with special matching current transformers, only the matching thermal relays can be tested for overload current tolerance. 6.3.6.4 After the test, if the test product meets the following requirements, the test is qualified. a. The thermal element is not burned;
b. The thermal relay starts from the cold state and passes 2 times the maximum setting current. It should be able to operate and reset. 6.3.7 Auxiliary contact connection and disconnection capacity test 188
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