Some standard content:
Machinery Industry Standard of the People's Republic of China
Approved by the Ministry of Machinery Industry on October 8, 1993
Subject content and scope of application
Machinery Industry Standard of the People's Republic of China
JB7113-93
Low-voltage shunt capacitor device
Page number, 1/12
Implementation on January 1, 1994
This standard specifies the scope of application, terminology, product classification, technical requirements, test methods, inspection rules, marking, etc. of low-voltage shunt capacitor devices.
This standard applies to shunt capacitor devices (hereinafter referred to as "devices") used to improve power factor in three-phase distribution systems with an AC frequency of 50 Hz and a rated voltage of 1 kV or less.
Cited standards
GB2681
GB2682
GB2900.16
JB3085
Wire colors in complete electrical equipment
Colors of indicator lights and buttons in complete electrical equipment Electrical terminology
Power capacitors
Basic size series of panels, racks and cabinets
Protection grade of low-voltage electrical enclosures
Product packaging and transportation regulations for electric drive control devices equipped with electronic devices shall not be specified in this standard. Except for the ones stated above, the remaining terms shall comply with the provisions of GB2900.16. (Single) capacitor
An assembly consisting of one or more capacitor elements assembled in a single housing and having lead terminals. Capacitor bank
A group of capacitors electrically connected together. Parallel capacitor device
A device mainly composed of capacitor banks and supporting equipment such as switches, which are connected in parallel in the industrial frequency AC power system to improve the power factor and reduce line losses.
Rated frequency of the device (fn)
The frequency used when designing the device.
Rated voltage of the device ()
The rated voltage of the system to which the device is to be connected. file://C:\\dlk\\WJ9.htm||tt| |Mechanical Industry Standard of the People's Republic of China
2005-2-17
Page number, 2/12
Rated current of the device (I)
The current (RMS value) used when designing the device, which is the rated current of the capacitor bank in the device. Rated capacitance of the device (C)
The capacitance value used when designing the device, which is the rated capacitance of the capacitor bank in the device. Rated capacity of the device (Q)
The capacity value used when designing the device, which is the rated capacity of the capacitor bank in the device. Rated voltage of the capacitor bank (U.)
The voltage used when designing the capacitor bank. Note: For internally connected multi-phase capacitors, U. refers to the line voltage. 3.10
Main circuit| |tt||Circuit used to perform the main function.
Auxiliary circuit
Circuit used to perform auxiliary functions.
Overvoltage protection
A protection that disconnects the power supply when the bus voltage exceeds a specified value. 3.13
Overcurrent protection
A protection that disconnects the power supply when the current flowing through the device exceeds a specified value. 3.14
Live parts
Any conductor or conductive part that is under voltage in normal use. Including neutral conductors, but excluding neutral protective conductors (PEN). 3.15
Exposed conductive parts
An accessible exposed conductive part of the device that is not normally energized but may be energized under fault conditions. 3.16
Protection against direct electric shock
Preventing dangerous contact between human body and live parts. 3.17
Protection against indirect contact
Prevent dangerous contact between human body and exposed conductive parts. 3.18
Neutral protective conductor (PEN) Neutral protective line
In some systems, a conductor that has the functions of both neutral conductor (N) and protective conductor (PE). file://C:\\dlk\\WJ9.htm
Standard of the Machinery Industry of the People's Republic of China
2005-2-17
Page, 3/12
National Excellent Russian Industry Standard
Product Classification
Installation Category
Indoor.
Ambient Air Temperature Category
Beisuo, 3/12
The ambient air temperature range of the installation and operation area is -5～+40℃. In this temperature range, the device is divided into several temperature categories according to the ambient air temperature range that the device can adapt to. Each temperature category is represented by a lower limit temperature value and an upper limit temperature value separated by a slash. The lower limit temperature is the lowest ambient air temperature at which the device can be put into operation, which is divided into two categories: -5℃; +5℃. The upper limit temperature is the highest ambient air temperature in which the device can operate continuously, with a maximum of 40℃, a 24h average maximum of 30℃, and an annual average maximum of 20℃.
Any combination of lower limit temperature and upper limit temperature can be selected as the temperature category of the device, such as -5/40, 5/40. The cooling air temperature during the operation of the device should not exceed the upper limit temperature plus 5℃. 4.3
Rated voltage
The preferred values of the rated voltage are: 0.38, 0.66, 1kV. Rated capacity
The preferred values of the rated capacity are: 90, 120, 150, 180, 240, 300, 450, 600kvar. Note: Devices with other parameters can be provided upon request of the purchaser. Technical requirements
Usage requirements
The altitude of the installation and operation area shall not exceed 2000m. 5.1.2
Ambient air temperature
Should comply with the temperature category corresponding to the device. 5.1.3www.bzxz.net
Relative humidity of ambient air
The relative humidity of the installation site shall not exceed 50% when the maximum temperature is 40℃. A higher relative humidity is allowed when the temperature is lower, such as 90% at 20℃, but it should be considered that due to temperature changes, moderate condensation may occur occasionally. 5.1.4
Usage voltage range
The usage voltage range is: (0.85～1.10)r. It does not include the transient overvoltage caused by connecting or disconnecting the device, but includes the influence of harmonics and power supply voltage fluctuations.
Steady-state overcurrent
The device shall be able to operate continuously at a root mean square value not exceeding 1.30 times the current produced by the capacitor bank of the device at rated frequency, rated sinusoidal voltage and without transient state. Since the actual capacitance may reach 1.10C, this overcurrent may reach about 1.43I. This current is the result of the combined action of the harmonic voltage on the capacitor bank and the power frequency overvoltage up to 1.10U. 5.1.6
Power frequency plus harmonic overvoltage
The power frequency plus harmonic overvoltage during the operation of the device shall not cause the overcurrent to exceed the value specified in Article 5.1.5, Page, 4/12
When the device is operated for a long time at not higher than 1.104%, the voltage peak value including all harmonic components shall not exceed 1.2/2U/s. 5.1.7
Other conditions
a. The installation site should be free of severe mechanical vibration: b. The installation site should be free of harmful gases and steam that damage insulation and corrode metals: C. The installation site should be free of conductive or explosive dust, and should be free of strong electric fields or strong magnetic fields: d. The installation site should not be exposed to direct sunlight, rain, snow, or severe mold invasion: e. The installation inclination should not exceed 5. .
Note: When the device needs to be installed under conditions that do not meet the provisions of this article, the purchaser should negotiate with the manufacturer. 5.2
Structure and performance requirements
Structure and appearance
The device should be able to withstand certain mechanical, electrical and thermal stresses. Its components should have good anti-corrosion performance. The device's overall dimensions should comply with the provisions of GB3047.1 and have a structure that can be fixed to the ground foundation and adjacent electrical cabinets. The device's structural design, electrical installation, and circuit layout should be economical, reasonable, safe, reliable, practical, beautiful, easy to operate, and easy to maintain. 5.2.1.3
Electrical appliances that need to be operated manually should be flexible during operation without getting stuck or having excessive operating force. The welded parts of the device should be welded firmly, and the welds should be smooth and beautiful, without weld penetration, cracks, undercuts, slag splashes, pores, slag inclusions, etc. 5.2. 1.4
The solder paste should be cleaned.
The device should have a main protective grounding terminal, whose conductivity should be the same as that of the phase conductor of the device's incoming line, and marked with a clear and durable grounding symbol.
The neutral line in the device should also be able to conduct the maximum current that may be required by the auxiliary circuit. The edges and openings of the parts in the device should be flat and smooth, without obvious burrs and cracks. 5.2.1.8
The opening angle of the double doors for maintenance of the device should not be less than 90°, and the doors should be flexible to open and close. The paint layer should not be scratched during opening and closing. There should be no obvious shaking after the door is locked.
The paint layer on the front and side panels of the device should not have wrinkles, flow marks, pinholes, bubbles, primer penetration, spots, fine sand particles, handprints, attachments, uneven color, etc., and no trimming marks and obvious mechanical impurities can be seen with the naked eye. 5.2.1.10
The coating of all plated parts on the device should not have peeling, shedding, blackening, mold and rust. Capacitance deviation
file://C:\\dlk\\WJ9.htm
2005-2-17
Excellent Machinery Industry Standard
The difference between the capacitance of the device and its rated capacitance should be within the range of 0~+10% of the rated capacitance, and the ratio of the maximum value to the minimum value of the capacitance between any two incoming terminals of the device should not be greater than 1.085.2.3
Shell protection grade
The shell protection grade of the device should comply with the provisions of GB4942.2, generally IP20 on the front and IP00 on the rest. 5.2.4
Electrical clearance and creepage distance
Page, 5/12
The electrical clearance and creepage distance of the electrical components in the device should comply with the relevant regulations, and their electrical clearance and creepage distance should be maintained during the life period of the specified use conditions.
The electrical clearance and creepage distance between the exposed live conductors of different phases in the device and between them and the casing shall not be less than the provisions in Table 1 Table 1 Electrical clearance and creepage distance
Rated voltage, kV
Electrical components
Electrical clearance,
Creepage distance, mm
The electrical components that can be configured in the device are knife switches, current transformers, lightning arresters, fuses, AC contactors, discharge and signal devices, capacitors, inductors, reactive power compensation controllers, measuring meters (voltage, current, reactive power), etc. These electrical components shall comply with the corresponding national standards or industry standards. The rated voltage, rated current, service life of the electrical components, as well as the connection capacity, breaking capacity, and short-circuit strength of the switches used to switch capacitors shall meet the requirements of the electrical parameters of the device, and the switch shall not be severely broken down when cutting off the capacitor. 5.2.5.3
The color of indicator lights and buttons shall comply with the provisions of GB2682. The rated current of knife switches and AC contactors shall not be less than 1.5 times the rated current of their loads. 5.2.5.5
Electrical components shall be installed in accordance with the instructions of their manufacturers. The installation and connection of components shall prevent their functions from being damaged due to interactions (e.g., heating, arcing, vibration, energy fields, etc.). 5.2.5.6
Electrical components and wiring terminals installed on the same bracket shall be easy to operate during installation, wiring, maintenance and replacement. 5.2.5.7
Electrical components shall be reliably fixed, anti-loosening measures shall be taken for components that are often subject to vibration, bolts that are not temporarily connected shall be tightened, and the layout of components shall be neat, correct, and easy to install and wire. For electrical components that need to be operated during operation, the center position of their operating parts (such as handles, buttons, etc.) should not be higher than 5.2.5.8
1.9m and not lower than 0.4m from the base surface of the device. The horizontal center line of the indicating instrument that needs to be observed during operation should not be higher than 2m from the base surface of the device. 5.2.6
Busbars, wires and wiring
The allowable current carrying capacity of the main circuit busbars and wires should not be less than 1.5 times the maximum working current that may pass through the circuit. The busbar connection should be tight, have good contact, and be neatly and beautifully configured. Measures to prevent electrochemical corrosion should be taken between busbars or at the connection between busbars and electrical component terminals, and ensure that the connection between current-carrying parts has sufficient lasting pressure, but the busbar should not be permanently deformed due to stress. 5.2.6.3
The color of the busbar and wire should comply with the provisions of GB2681. The arrangement of busbar phase sequence shall comply with the provisions of Table 2 (front view). Busbar phase sequence arrangement mode
file://C:\\dlk\\WJ9.htm
2005-2-17
Neutral line
Vertical arrangement
Horizontal arrangement
Front and rear arrangement
Bei, 0/12
The material, connection and arrangement of the busbar and the insulation support shall meet the requirements of the expected rated short-circuit withstand current of the device. The cross-section of the auxiliary circuit insulated wire shall be selected according to the rated working current to be carried, but shall not be less than 1.5mm2 (single-strand copper core insulated wire) or 1.0mm2 (multi-strand copper core insulated wire). 5.2.6.6
The wiring of the auxiliary circuit shall be neat and beautiful, and shall not be laid close to exposed live parts with different potentials or sharp edges. The wire shall not swing freely and shall be properly supported or installed in the pedestrian line duct. 5.2.6.7
The wires of electrical components connected to moving parts (such as doors) should be multi-strand copper core insulated wires. When designing, it should be considered that when the component moves, the connecting wires will not be subjected to excessive tension and mechanical damage. Wiring should be carried out on fixed terminals. No wiring points are allowed in the middle of the wires. All wiring points should be firm, in good contact, and have sufficient lasting pressure.
One wiring terminal can generally only connect one wire. If necessary, it is allowed to connect two wires. When it is necessary to connect more than two wires, appropriate measures should be taken to ensure the reliable connection of the wires. 5.2.6.10
The insulated wires connected to the heating electrical components should take into account the impact of the heating components on the insulation layer of the wires. Appropriate measures should be taken. The ends of the insulated wires of the auxiliary circuits should have connection marks consistent with the requirements of the drawings. The marks should be clear and durable. The rated voltage of the insulated wires shall not be lower than the rated working voltage of the corresponding circuit. Protection against electric shock
For protection against direct electric shock, the exposed conductive parts of the device should be protected by grounded baffles or casings. The baffles or casings should be firmly fixed and have a certain mechanical strength, and should meet the electrical clearance and creepage distance required by the device. When it is necessary to move, open the casing or disassemble, a key or tool must be used, or there must be a power-off interlock mechanism. For protection against indirect electric contact, a reliably grounded protective circuit should be used for protection. The protective circuit can be completed by installing a protective conductor 5.2.7.2
separately or by using the structural components of the device (or both). a. The exposed conductive parts of the device, the metal base of the electrical components that need to be grounded, and the doors, covers or similar parts of the electrical components with a voltage exceeding 60V should all be ensured to be reliably connected to the protective circuit. b. The electrical continuity of the protective circuit should be ensured by effective wiring, either directly connected or connected by a protective conductor. C. All components of the protective circuit in the device should be designed so that they can withstand the maximum thermal stress and electromotive stress that the device may encounter at the installation site.
d. When the housing of the device is used as a component of the protection circuit, its minimum cross-section shall comply with the provisions in Table 3. Table 3
Cross-sectional area of phase conductor and minimum cross-sectional area of corresponding protection conductor Phase conductor cross-sectional area S
file://C:\\dlk\\WJ9.htm
Minimum cross-sectional area of corresponding protection conductor
2005-2-17
National Machinery Industry Standard
e. For easy identification, the color of the protection conductor shall be yellow-green. The yellow-green color shall not be used for any other purpose except as the identification color of the protection conductor.
f. The cross-sectional area of the protection conductor in the device shall be selected according to the provisions of Table 3. If the conductor selected according to Table 3 is not of standard size, it shall be close to the standard size; when the materials of the phase conductor and the protection conductor are different, they shall be corrected to achieve the conductive effect of the same material. g. The metal housing of the device shall have a protective grounding terminal and be marked with an obvious and durable grounding mark. 5.2.8
The temperature rise at the connection between busbars and electrical components shall not be higher than the specified temperature rise at the outlet of the electrical components. The temperature rise at the connection between busbars shall not be higher than the provisions of Table 4. The temperature rise of insulated wires and electrical components in the device shall not be higher than the specified allowable temperature rise. Table 4
Busbar connection
Copper-copper
Copper sugar tin-copper sugar tin
Copper silver-copper silver-copper plated
Dielectric strength
Temperature rise, ℃
Busbar connection temperature rise
Busbar connection
Aluminum tin-aluminum sugar tin
Aluminum tin-copper sugar tin
Temperature rise,
The main circuit phases and the auxiliary circuits directly connected to them should be able to withstand 2.5kV (root mean square value) power frequency test voltage. The auxiliary circuits in the device that are not directly connected to the main circuit to the ground (frame) and the live parts to the covering layer made of insulating materials or the external operating handle should be able to withstand the test voltage specified in Table 5.
Rated voltage
Undervoltage protection
Test voltage
The device should be prevented from automatically switching on when the power is turned on again after power failure. 5.2.11
Power frequency overvoltage protection
Test voltage
When the grid voltage is greater than 1.05, the controller does not issue a command to switch on the capacitor bank, and the device only executes a command to cut off the capacitor bank; when the grid voltage reaches 1.10, the device should be able to cut off the capacitors one by one within 1 minute. 5.2.12
Measures to limit inrush current
The inrush current generated when the capacitor bank is put into operation should be limited to less than 20 times the rated current of the capacitor bank. 5.2.13
Harmonic current value and overcurrent protection
file://c:\\dlk\\WJ9.htm
2005-2-17
National Excellent Russian Industry Standard
Beijing, 8/12
When the harmonic current value (RMS value) is greater than 0.5I (RMS value) of the fundamental wave, the device should cut off the capacitors group by group and prevent repeated switching in a short time: when it returns to normal, the device should automatically resume work. The harmonic overvalue protection of the device can not only prevent the harmonic current from exceeding the limit value, but also provide overcurrent protection. 5.2.14
Discharge device
The discharge device should ensure that the residual voltage on the capacitor drops to 50V within 3 minutes after the power is cut off, and when any group capacitor is put into use again, the residual voltage on its line terminal should not exceed 10% of the rated voltage. When the capacitor itself is equipped with a discharge device that can meet the above requirements, the device does not need to be equipped with a separate discharge device. 5.2.15 Control of capacitors
a. Control parameters: single control or multiple integrated control such as voltage, reactive power, power factor or time. b. Working mode: The input and removal of capacitors are automatically controlled or manually controlled. Reactive power compensation control adopts the working mode of equal capacity cyclic switching, first input first cut, last input last cut or coded switching working mode and should be able to prevent repeated switching of capacitors. Under the condition of (0.85～1.10), automatic or manual control is correct. c. Switching delay time: It should be adjustable to meet the provisions of Article 5.2.14 that the residual voltage on the line terminal of any grouped capacitor shall not exceed 10% of the rated voltage when it is put into use again (pre-set according to the purchaser's requirements). 5.2.16
Counting device for switching times
When necessary, the device can be equipped with a counting device for the number of cyclic switching times. 5.2.17
Instruments and displays
a. The device shall be equipped with an ammeter and a voltmeter; b. The device shall be equipped with a power factor display:
c. The device shall be equipped with a capacitor input and output display. 6
Test methods
Test conditions
All tests and measurements of the device, unless otherwise specified, shall be carried out under the following conditions: a. The ambient air temperature is 5 to 35°C;
b. The waveform of the AC voltage used in the test and measurement shall be an approximate sine waveform (i.e., the two half-waves are basically the same, and the ratio of their peak value to the RMS value is within the limit of √2±0.07, and the RMS value of the harmonics is not greater than 5% of the RMS value of the fundamental wave). 6.2
Test method
Appearance and structure inspection
Perform visual inspection and instrument measurement according to the requirements of 5.2.1 and 5.2.4~5.2.7. 6.2.2
Capacitance inspection
file://C:\\dlk\\WJ9.htm
2005-2-17
Decommissioning, 9/12
Should be measured at voltage (0.9~1.1)U and frequency (0.8~1.2)f. The device or grouped capacitors can be measured with a capacitance measuring bridge with a measurement error of no more than 1% or other methods that can ensure measurement accuracy (such as voltage and current method). 6.2.3
Temperature rise test
During the test, the device should be placed the same as in normal use. Regardless of whether the device is designed with side panels, the side panels should be installed during the test. The test is carried out in two steps:
a. Apply 1.2U power frequency voltage to the device (disconnect the overvoltage protection device), and measure the shell temperature of the two capacitors in the hottest area of the capacitor bank and the cooling air temperature between them after the temperature stabilizes; b. Short-circuit the line terminals of the capacitor, apply a lower power frequency voltage to the device, so that the current reaches 1.3Is, and measure the temperature at each electrical connection point in the device after the temperature stabilizes.
Sufficient time should be allowed for the temperature rise to stabilize during the test. Use a thermometer, thermocouple or other thermometer to measure the temperature every 1 to 2 hours. For test a, when the temperature change does not exceed 1°C for 4 consecutive measurements within 6 hours; for test b, when the temperature change does not exceed 1°C for 4 consecutive measurements within 3 hours, the temperature is considered to be stable. At the same time, it is necessary to measure the ambient air temperature of the device. At least two thermometers or thermocouples should be evenly arranged around the device. The height of the arrangement point is approximately equal to half of the device and 1m away from the device. Their average reading value is used as the ambient air temperature of the device. When measuring, the influence of forced air flow and thermal radiation on the measurement accuracy should be prevented. The capacitance should be measured at the beginning and end of the test, and there should be no significant difference between the measured values before and after. 6.2.4
Mechanical operation test
Some parts of the device that need to be operated manually should be tested for switching operation without power. The factory test should be no less than 5 times, and the type test should be no less than 50 times. If the appliance has been type tested in accordance with relevant regulations and there is no damage to it during installation, this type test is not necessary.
During the test, the appliance should be able to open and close normally, the mechanical movement should be flexible, there should be no jamming or excessive operating force, and the mechanical interlock or other accessories connected to it should not be damaged by the above-mentioned number of operations. 6.2.5
Dielectric strength test
Apply the test voltage value specified in Article 5.2.9 between the phases of the device, between the phases and the ground, and between the auxiliary circuit and the ground. When the live parts are tested on the external operating handle made of or covered with insulating materials, the device frame is not grounded, and the handle is wrapped with metal foil. Then, 1.5 times the test voltage value specified in Article 5.2.9 is applied between the metal foil and the live parts. During the test, the voltage should start from 30%50% of the test voltage, and the voltage should be steadily increased to the specified test voltage value in about 10 to 30 seconds, and maintained for 1 minute, followed by a post-test voltage reduction operation until the power supply is cut off at zero voltage. Before the test, the electrical connection between the arrester, capacitor and busbar that should not withstand the test voltage should be disconnected. 6.2.6
Power-on operation test
Automatic control devices should be tested for power-on operation. Under the condition that the auxiliary circuit is respectively connected with 0.85, 1.00 and 1.10 voltage, operate three times each, there should be no false operation, and the operation, instrument and signal display of all electrical components should meet the requirements, and observe whether the reading of the switching counter is consistent with the actual switching times. Loss of voltage protection test
This test can be carried out under the condition of manual operation and not connecting all capacitor banks. Close all capacitor switching switches through the manual button on the device. Cut off the power supply of the device after 3 minutes, and then connect the power supply after another 3 minutes. If the switching switches of all capacitors in the device are still in the non-operating state, this test is passed.
file://c:\\dlk\\WJ9.htm
2005-2-17
Minus positive internal
Power frequency overvoltage protection test
This test is carried out without connecting the capacitor bank under automatic control. Use phase-adjusted and voltage-adjusted power supply to supply negative power to the device, 10/12
a. Adjust the power supply voltage to the rated voltage, change cos, then the controller will issue a command to put in or cut off the capacitor group, and the delay time of putting in or cutting should meet the technical requirements of the controller;
b. Adjust the power supply voltage to 1.05U to change cosβ, then the controller will only issue a command to cut off the capacitor group, but not to put in the capacitor group, and the delay time of cutting should meet the technical requirements of the controller; c. Adjust the power supply voltage to be slightly greater than 1.10, change cos, then the controller will issue a command to cut off all capacitors group by group, and the delay time of cutting should meet the technical requirements of the controller.
Harmonic over-value and overcurrent protection test
This test is carried out under automatic control. The control parameters (voltage, current) of the controller are provided by the harmonic power supply device. Raise the power frequency voltage to, manually put in one or more capacitors, adjust the harmonic voltage, and make the harmonic current (root mean square value) slightly greater than 0.5I, the controller should immediately issue a command to cut off the capacitor group. 6.2.10
Inspection of enclosure protection level
Inspection of enclosure protection level shall be carried out according to the test method specified in GB4942.2. 6.2.11
Inspection of discharge device
/2Un DC voltage, disconnect the power supply after 1min, and record the time it takes for the voltage to drop to 50V on the capacitor bank during the test. If the discharge device is a resistor type, the method of measuring resistance can also be used. After measurement, calculate according to the following formula: t=RCn2U./U,
Where: t is the time it takes to discharge to the allowable residual voltage, s: R—discharge resistance measurement value, M2;
C—capacitance measurement value, μF;
U——capacitor rated voltage, V;
R——allowable residual voltage, V.
Inrush current test
The inrush current test only verifies the inrush current value in the circuit when the last group of capacitors is put into operation, that is, first put all the remaining capacitors into operation, and then put the last group into operation after they are working stably. When put into operation, the inrush current value should be controlled to be the maximum, and the test should be carried out 3 times. If it cannot be controlled, the test should be carried out randomly 30 times. Connect the shunt in series in the circuit of the last group of capacitors, and measure the inrush current value of each test by recording the oscilloscope. 7
Inspection rules
The test of the device is divided into: factory test, type test and acceptance test. file://C:\\dlk\\WJ9.htm
2005-2-17
National Machinery Industry Standard
The test items are shown in Table 6.
Test category
Factory test
Factory test
Type test
Factory test
Test items
Appearance and structure inspection
Capacitance inspection
Mechanical operation test
Dielectric strength test
Power-on operation test
Undervoltage protection test
Power frequency overvoltage protection test
Mechanical operation test
Dielectric strength test
Test items
Technical requirement number
5.2.4~5.2 .7
5.2.15~5.2.17
Harmonic over-value and overcurrent protection test
Enclosure protection grade inspection
Discharge device inspection
Temperature rise test
Surge current test
Test method number
The purpose of factory test is to detect defects in manufacturing. This test is carried out by the manufacturer on each device produced.
Type test is to examine whether the design, size, material and manufacturing of the device meet the performance and operation requirements specified in this standard. Type test is carried out when new products are produced. In production, when the structure, material or process of the device is changed and the change may affect the performance of the device, type test should also be carried out. At this time, only test items related to these changes can be carried out. In normal production, type test should also be carried out every five years. Type test is carried out by the manufacturer. The device for type test should be qualified by factory test. Each type test can be carried out on several identical devices.
Except for Item 13 and Item 14, the type test items shall have test data for at least two devices. When the purchaser requires, certificates of these tests shall be provided. 7.3
Acceptance test
Acceptance test is mainly a test that the user needs to perform before installation. The purpose of the test is to check whether the device has been damaged during transportation to ensure that the device to be installed is in good condition. It is recommended to perform the factory test items in Table 6. 8
Marking, packaging, transportation and storage
A label indicating the following content shall be installed on the front panel of each unit: a. Model and name:
file://c:\\dlk\\WJ9.htm
2005-2-17
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.