GB 3836.9-1990 Explosion-proof electrical equipment for explosive environments, cast-type electrical equipment "m"
Some standard content:
National Standard of the People's Republic of China
Explosion-proof electrical equipment for explosive atmospheres
Poured electrical equipment "m"
Electrical apparatus for explosive atmospheresEncapsulated electrical apparatus\m\1Subject content and scope of application
GB3836.9-90
This standard applies to cast-type electrical equipment (the entire equipment or part of it, the same below) and cast-type components with a rated voltage not higher than 10kV. It stipulates Structural requirements and test requirements for their explosion-proof safety. In addition to complying with this standard, cast-sealed electrical equipment and cast-sealed components must also comply with the relevant provisions of GB3836.1 "General Requirements for Explosion-Proof Electrical Equipment for Explosive Environments". If GB3836.1 is inconsistent with the provisions of this standard, the provisions of this standard shall apply. 2 Reference standards
GB3836.1 General requirements for explosion-proof electrical equipment for explosive environments GB3836.3 Explosion-proof electrical equipment for explosive environments Increased safety electrical equipment "e" GB3836.4 Explosion-proof electrical equipment for explosive environments Intrinsically safe circuits and Electrical equipment "i" 3 terms
3.1 Casting type
A kind of explosion-proof type. The parts that may produce arcs, sparks or high temperatures that ignite the explosive mixture are sealed in the potting compound so that they cannot ignite the surrounding explosive mixture. 3.2 Encapsulated electrical equipmentm”
Electrical equipment in which the entire equipment or part of it is encapsulated in a encapsulating agent and cannot ignite the surrounding explosive mixture under normal operation and approved overload or approved fault.| |tt||3.3 Casting type component "m"
Only after the casting and explosion-proof measures have been taken and combined with the explosion-proof electrical equipment using this component can it be used in an explosive environment and cannot be used alone in an explosive environment. Components. bzxz.net
3.4 ??Potting agent
Materials used for potting, including thermosetting, thermoplastic, room temperature curing, with or without fillers or additives, such as epoxy resin .
3.5 Temperature range of the potting agent
During operation and storage, the performance of the potting agent complies with the temperature range required by this standard. 3.6 Continuous operating temperature of the potting agent||tt| |The highest temperature that the sealing agent can continuously withstand. 3.7 Embedding
Pour the sealing agent into the model, completely bury the parts to be sealed in the sealing agent, and remove the model shell after the sealing agent solidifies. process. The State Bureau of Technical Supervision approved the implementation on 1991-03-01
3.8 can sealing
GB3836.9-90
Pour the sealing agent in the model The process of completely burying the parts to be sealed in the potting agent and retaining the shell of the model after the potting agent solidifies. 3.9 Pouring | 3.10 The integrity of the sealing
The explosion-proof performance of the sealing type is not damaged. 3.11 The minimum distance between the two exposed conductors in the sealing compound. distance. 4
Technical Requirements
4.1 General Requirements
4.1.1 The potting agent must have appropriate chemical, thermal, electrical and mechanical stability and comply with this Standard test requirements. 4.1.2 The potting agent manufacturer must provide relevant technical information about the potting agent, such as potting agent material, performance, temperature range, continuous operating temperature, potting process, etc., and explain its ability to dissolve. The solvent of the potting agent. 4.1.3 There should be no visible pores in the potting agent after potting. 4.1.4 The potted components (such as relays, transistors, etc.) are allowed to have an internal cavity with a net volume of no more than 100cm\. In this case, the thickness of the potting compound between components must not be less than 3mm. If the net volume is less than 1cm, the thickness of the potting compound between components can be reduced to 1mm, but loose filler must not be used to reduce the internal cavity. volume. 4.1.5 The contacts of the switch must be sealed. If the rated current exceeds 6A, the housing must be made of inorganic materials. 4.1.6 The sealed electrical equipment or components connected to the external power supply. , must be able to withstand at least 4000A of expected short-circuit current (unless the expected short-circuit current is otherwise specified in the mark), and must have a protective device commensurate with its ability to withstand short-circuit current. 4.1.7 In the event of an approved overload or an approved possible cause. An internal fault (such as short circuit, printed circuit damage, component performance change, etc.) of overvoltage or overcurrent shall not damage the integrity of the potting seal. If a fault leads to one or more subsequent faults (eg causing overloading of other components), the initial and subsequent faults are considered to be one fault.
4.1.8 Reliable components or assemblies must comply with the following requirements. 4.1.8.1 The following components are considered to be reliable when they are sealed in accordance with this standard and do not exceed 2/3 of their rated power and rated voltage during normal operation. Short-circuit faults and reduced resistance faults: thin film resistors;
a.
spiral type single-layer wire-wound resistors;
b.
spiral type single layer coil.
c.
4.1.8.2 When the following components are cast in accordance with this standard and do not exceed 2/3 of their rated voltage during normal operation, it is considered that short circuit faults and reduced resistance faults will not occur And those that increase capacitance failure: plastic film capacitors;
a.
b. Paper capacitors;
c. Ceramic capacitors.
4.1.8.3 When optocouplers and relays used to isolate different circuits are sealed according to this standard and meet the following conditions, it is considered that the isolation between circuits will not be broken down:
a. The sum of the effective values ??of the circuit voltage does not exceed 1000V; b. The voltage for the dielectric strength test according to Article 5.1 of this standard is not less than 1.5U. 4.1.8.4 When the coils, transformers and motor windings are sealed in accordance with this standard and meet the following conditions, it is considered that they will not be short-circuited between turns; for transformers, it is considered that there will be no breakdown between the windings: a. Comply with the provisions of Article 8.1 and Article 8.2 of GB3836.3; GB3836.9--90
b. There is a protection device to prevent the temperature from exceeding the allowed value. 4.1.8.5 Power transformers that comply with the provisions of Article 6.1 of GB3836.4 (except 6.1.2.2a) are considered to be free from inter-turn short circuit or inter-winding breakdown failure.
4.1.8.6 If the exposed conductors between different parts of the same circuit or two independent circuits, or between the circuit and the grounded metal, have been fixed to each other before casting, and the spacing after casting shall not be less than If the values ??specified in Table 1 are specified in Table 1, it is considered that failure will not occur. Table 1 Minimum casting spacing
Rated voltage, V
Minimum casting spacing, mm
380|| tt||1
500
1.5
Note: The rated voltage can exceed 10% of the listed value. 4.1.9 The layer thickness of the sealing agent must comply with the following requirements. 660
2
1000
2.5
1500
4
3000
7
6000| |tt||12
10.000
20
4.1.9.1 The thickness of the free surface of the potting compound and the potted component or conductor potting compound shall not be less than 3mm. For cast-type electrical equipment or cast-type components whose free surface area of ??the casting agent does not exceed 2 cm2, the above-mentioned thickness must not be less than 1 mm. In this case, if it cannot pass the impact test specified in Article 21.1 of GB3836.1 or the dielectric strength test specified in Article 5.1.2 of this standard, a protective device (such as mechanical protection) must be added. The inspection unit must add the symbol "文" after the explosion-proof certificate number. 4.1.9.2 If it is sealed with a metal protective shell, the thickness of the potting agent between the shell and the component or conductor must be not less than 1mm. 4.1.9.3 If the protective shell seal is made of insulating shell material: if the thickness of the insulating shell is not less than 1mm, the thickness of the sealing agent between the shell and the component or conductor is not required; a.
b.||tt ||If the thickness of the insulating shell is less than 1mm, the sum of the thickness of the insulating shell and the thickness of the sealing agent layer must meet the requirements of Article 4.1.9.1. 4.1.10 Temperature limits must comply with the following requirements. 4.1.10.1 The maximum allowable surface temperature of the sealing compound must comply with the provisions of Article 4.1 of GB3836.1. The temperature of the potting agent during normal operation and the continuous operating temperature must comply with the specifications of the manufacturer's technical documents. 4.1.10.2 Protective measures must be taken for potted electrical equipment and potted components so that the integrity of the potting will not be damaged under the conditions described in Articles 4.1.6 and 4.1.7.
4.1.11 External connections must comply with the following requirements. 4.1.11.1 Conductors, including cables, that pass through the encapsulant shall be sealed to prevent external explosive mixtures from entering the encapsulated electrical equipment or its encapsulated parts and encapsulated components. The length of the encapsulant covering the connecting conductor along the direction of entry of the explosive mixture shall not be less than 5 mm.
4.1.11.2 If the connecting conductor and the encapsulated electrical equipment or encapsulated components are permanently connected and may be subjected to external forces, a pull-out test shall be carried out in accordance with Article 5.11.
4.1.11.3 The exposed live parts that pass through the encapsulant from the inside of the encapsulated electrical equipment or encapsulated components to the outside shall adopt the explosion-proof type specified in Article 1.2 of GB3836.1 that is applicable to the explosion-hazardous place. 4.1.12 For components that are not completely buried in the encapsulant, such as partially encapsulated printed circuit boards, the bonding between the encapsulant and these components shall be based on the process specified by the assembly factory, which should prevent moisture from entering between the encapsulant and the components. 4.2 Special requirements
4.2.1 Motor
For coils embedded in slots, the slot insulation thickness shall be not less than 0.2mm, and the length of both ends extending out of the slot shall be not less than 5mm, and shall comply with the requirements of 4.1.9.1.
4.2.2 Batteries and accumulators
4.2.2.1 Batteries and accumulators that are considered not to release gas, not to escape electrolyte, and not to exceed the allowable temperature when used under the conditions specified in the manufacture may be cast.
4.2.2.2 For cast batteries and accumulators, a structure that can discharge the gas generated in unexpected situations to the outside of the shell shall be adopted. If other measures are adopted, they shall not damage the integrity of the cast and shall be approved by the inspection unit. GB3836.9-90
4.2.2.3 When casting batteries and accumulators, a margin shall be left for expansion, such as cushioning with elastic body. 4.2.2.4 If the charging device is not in the same housing, the inspection unit must add the symbol "X" after the explosion-proof certificate number, and the manufacturer must explain the charging conditions in the corresponding technical documents. 4.2.2.5 Encapsulated batteries and accumulators must be able to pass the test in Article 5.12. 4.2.3 Fuse
4.2.3.1 Before encapsulation, the fuse element must be sealed, such as encapsulated in a glass or ceramic container. 4.2.3.2 The disconnecting capacity of the fuse must comply with the provisions of the relevant national standards. 4.2.3.3 If the integrity of the encapsulation is not damaged, the temperature at which the fuse element melts can exceed the continuous operating temperature of the encapsulant. 5 Tests
5.1 Dielectric strength test
5.1.1 Dielectric strength test of encapsulant
The test is within the temperature range of the encapsulant. The test specimen is a disk with a diameter of 50±2mm and a thickness of 3±0.2mm. Electrodes with a diameter of (30±2)mm are placed in the center of the two sides of the specimen, and then a voltage of 4kV, 48~62Hz is applied for 5min. There shall be no arcing or breakdown.
5.1.2 The dielectric strength test of cast-in-place electrical equipment and cast-in-place components is carried out between the following parts: a. Between independent circuits;
b. Between each circuit and the grounded part;
c. Between each circuit and the surface of the cast agent (the surface of the cast agent can be covered with metal foil). The test is carried out with an AC voltage of 48~60Hz. If the peak value of the feeding voltage exceeds 90V, the test voltage is 500V. If the peak value of the feeding voltage exceeds 90V, the test voltage is 2U+1000V, the minimum is 1500V. If the AC voltage will damage the encapsulated electronic components, a DC voltage equal to the AC peak value can be used. In the above formula, U:
- for a, it is the sum of the voltages of the two circuits;
- for b and c, it is the network voltage.
The test voltage must be steadily increased to the specified value in no less than 10s, and then maintained for 60s. There must be no arcing or breakdown. For high-voltage products with a rated voltage of more than 1000V, additional tests must be carried out to confirm that local discharge and corona in the encapsulant will not affect the performance of the encapsulant.
5.2 Water absorption test
If the equipment is used in a humid environment, the sample of its encapsulant must be subjected to a water absorption test. Three specimens with a diameter of 50±2mm and a thickness of 3±0.2mm are dried in a furnace at 50±2℃ for 24±1h. Cool in a drying oven, weigh the total weight, immerse in tap water at 23±2℃ for 24h, take out and wipe dry, and weigh the total weight again. The added weight must not exceed 1% of the weight when dry.
If the product is encapsulated with an encapsulant that has not been tested for water absorption, the inspection unit must add the symbol "x" after the explosion-proof certificate number, and the manufacturer must explain the restrictions on use in the corresponding technical documents. 5.3 Light resistance test
The encapsulant used for Class 1 encapsulated lamps and Class IⅡI encapsulated electrical equipment or encapsulated components without a light shield must be subjected to a light resistance test.
Six samples of 50±1mm×6±0.2mm×4±0.2mm are cast and formed according to the same process as the manufacturer's casting of encapsulated electrical equipment or encapsulated components, and the casting process is stated in the test report. The test is carried out in a xenon lamp exposure room, and the exposure light is made similar to sunlight by a filter system. The black grid temperature is 55~58℃, and the exposure time is 1000h.
After exposure, impact bending test is conducted. The impact bending strength of the exposed side shall not be less than 50% of that before exposure. If the impact bending strength cannot be measured because no fracture occurs before exposure, no more than 3 test bars shall be fractured during the impact bending test after exposure. Note: The impact bending test is conducted in accordance with the provisions of ISO/R179. 5.4 Surface resistance determination
GB3836.9-90
The surface resistance determined in accordance with Chapter 25 of GB3836.1 shall comply with the provisions of Article 7.2 of GB3836.1. 5.5 Heat resistance test
Perform in accordance with Article 24.2.2, Item a of GB3836.1. 5.6 Cold resistance test
Perform in accordance with Article 24.2.2, Item b of GB3836.1. 5.7 Temperature test
If there is no external load, the test shall be carried out in accordance with Article 24.1 of GB3836.1; if there is an external load, the current shall be adjusted to the highest value that will not cause the protection device to operate. If the protection device is a fuse that complies with the relevant standards, the test current shall be 1.7 times the rated current. The temperature during normal operation shall not exceed the temperature limit specified in Article 4.1.10. Under the fault conditions specified in Article 4.1.7, the surface temperature shall not exceed the maximum allowable surface temperature.
5.8 Thermal cycle test
5.8.1 See Appendix A for the test process.
Place one or more temperature sensors in the hottest spot in the encapsulant on the sample determined by the inspection unit. If there is a coil on the sample, the temperature can be calculated from the coil resistance.
Place the sample in an environment of 21±5℃, and after the temperature stabilizes, place it in an environment of (TAmax+10±2)℃, where TAmx is the maximum ambient temperature specified during operation. If the temperature difference between the inside and outside of the sample is less than 2K, the temperature of the sample is considered to be stable. After the sample temperature stabilizes, power is supplied, and the voltage is the most unfavorable voltage value in the range of 90% to 110% of the rated voltage, except for the following cases: a. Other documents specify other voltage tolerances for the device; b. The sample has a thermal protection device inside. In this case, the voltage applied is the voltage of the highest temperature that will not cause the non-self-adjusting thermal protection device to operate. The internal thermal protection device can also be bridged during the test. Observe the internal temperature change until the temperature stabilizes. However, the shortest power supply time is 1h. The internal temperature must not exceed the continuous operating temperature of the encapsulant.
The sample is powered off, removed from the (TAmax+10±2)℃ environment, and cooled to 21±5℃. The sample is placed in an environment of (TAmln-5±2)C, where TAmin is the specified minimum ambient temperature during operation. After the temperature stabilizes, the power supply voltage is still as specified above. Observe the internal temperature change until the temperature stabilizes. However, the shortest power supply time is 0.5h. The sample is powered off and cooled to (Tamlm-5±2)℃, and the shortest cooling time is 0.5h. Power on and off as described above, and after three cycles, remove the sample from the (TAmin-5±2)℃ environment and raise its temperature to 21±5℃.
5.8.2 Acceptance criteria
Observe the sample with the naked eye, and the encapsulant shall not have any visible signs of damage to the explosion-proof integrity, such as cracks, peeling, unacceptable shrinkage, expansion, decomposition, softening, exposure of the encapsulated part, etc. In addition, the encapsulant shall not have any signs of overheating. 5.9 Grease and water resistance test
The sample must be able to prevent liquid from entering.
When performing the grease resistance test, the grease that may retreat during the working process of the product is used for the test. The samples were immersed in grease at 50°C for 24 to 26 hours. During the water resistance test, the sample is immersed in a polymer solution containing 35% water for 24 to 26 hours. After the test, the sample was taken out of the liquid tank, dried carefully, placed in the test room for 24 hours, and then subjected to mechanical testing. If any sample fails the mechanical test, the inspection unit must add the symbol "x" after the explosion-proof certificate number, and the manufacturer must explain the restrictions on use in the corresponding technical documents.
5.10 Mechanical test
Conducted in accordance with Chapter 21 of GB3836.1.
The cast-type electrical equipment or cast-type components installed in the enclosure that can withstand the above mechanical test are not subject to mechanical testing. The inspection unit must add GB3836.9-90
after the explosion-proof certificate number. Symbol "X", the manufacturer must state the restrictions on use in the corresponding technical documents. 5.11 Cable pull-out test
Along the direction of the cable entering the potting compound, the value of the applied pulling force in N is: a. 20 times the value of the cable diameter in mm; b. Pouring type electrical 50 times the weight of the equipment or encapsulated components in kg. Take the smaller of the two, but at least 1N, lasting 1h. There should be no displacement between the cable and the potting compound after the test. 5.12 Discharge test of batteries and accumulators
Samples shall be equipped with one or several internal temperature sensors as specified in 5.8.1. The sample is placed in an environment of Tamax ±2℃. After the temperature stabilizes, the fully charged battery and accumulator are fully discharged through one of the following loads:
8. When the encapsulated electrical equipment or encapsulated components have a current-limiting resistor or electronic device, 1m2; b. Adjust the load so that the current is equal to 1.7 times the rated current of the encapsulated fuse; c. The maximum current that will not cause the encapsulated thermal protection device to operate. If the load is sealed together with the battery or accumulator, or the load is fixed on the sample, short circuit should be considered unless the load is a fault-free component. The temperatures of batteries, accumulators and potting compounds must comply with the provisions of Article 4.1.10.1. For acceptance criteria, see Section 5.8.2.
5.13 Partial discharge level test of voltage transformer The partial discharge level test of voltage transformer must comply with relevant standards. 6 Inspection procedures
6.1 The inspection procedures for cast-type electrical equipment and cast-type components manufactured in accordance with this standard must comply with the provisions of Chapter 31 of GB3836.1. 6.2 In addition to the relevant provisions of Chapter 4 of GB3836.1, the type inspection of cast-type electrical equipment and cast-type components must also be conducted with the following tests:
6.2.1 The sealing agent must be tested Dielectric strength test (Article 5.1.1), water absorption test (Article 5.2) and light resistance test (Article 5.3). 6.2.21 Category 21 electrical equipment or components must take 3 samples for the following tests: a. The first sample is subjected to surface resistance test (Article 5.4), temperature test (Article 5.7), cable pull-out test (Article 5.11), heat resistance test Test (Article 5.5), cold resistance test (Article 5.6), thermal cycle test (Article 5.8), dielectric strength test (Article 5.1.2) and mechanical test (Article 5.10); b. The second sample is subjected to grease resistance test (Article 5.8) 5.9) and mechanical testing (Article 5.10); c. The third sample is subjected to water resistance test (Article 5.9) and mechanical test (Article 5.10). 6.2.3 Class III electrical equipment or components must take two samples for the following tests: a. The first sample is subjected to surface resistance test (item 5.4), temperature test (item 5.7), cable pull-out test (item 5.11), and heat resistance test (Article 5.5), cold resistance test (Article 5.6), thermal cycle test (Article 5.8), dielectric strength test (Article 5.1.2) and mechanical test (Article 5.10); b. The second sample is subjected to heat resistance test (Article 5.5) Article), cold resistance test (Article 5.6) and mechanical test (Article 5.10). 6.2.4 Batteries and accumulators must undergo discharge tests (Article 5.12). If the sealed battery or accumulator is used in conjunction with other power sources and has an electrical connection, a dielectric strength test (Article 5.1.2) must also be performed. 6.3 Factory inspection
Each product must be inspected and tested according to the following items and meet the technical requirements. Visual inspection of encapsulated electrical equipment or encapsulated components. For acceptance criteria, see Section 5.8.2. 6.3.1
6.3.2 The dielectric strength test must be carried out according to Article 5.1.2 between the following parts: between independent circuits that can be accessed from the outside of the equipment; a.
circuit that can be accessed from the outside (can be connected together) and external metal parts; b.
Between an externally accessible circuit with an operating voltage of not less than 60V and an externally accessible part adjacent to the circuit. c.
Check the electrical performance (such as voltage, current, power, etc.), which must comply with the technical standards of the proposed inspection unit 6.3.3
GB 3836.9-90
6.3.4- The partial discharge level of the voltage transformer with a voltage higher than 1KV must comply with the relevant standards. The markings | Supplement the following content:
a. Input and output electrical data, such as voltage, current, etc. 8. External breaker data (when needed): c. Allowable short-circuit current (if not 4000A specified in 5.4) UI
0.9~1.1U
(Tamax+10±2)t
+21±2
TAm
+2
In the picture: TAmax
TA min -
U.
tga
AT<±2K
AT2K
>1h||tt ||GB3836.9—90
Appendix A
Test process diagram of thermal cycle test
(reference)
AT4.2K
tga< 2K/h
0.5h
T±2T±2T±2T±2K
Figure A1
Maximum ambient temperature in specified operation; specified operation Minimum ambient temperature; rated voltage:
Temperature change rate:
The temperature difference between the inside and outside of a sample;
AT
U——The voltage applied to the sample ;
T—temperature of sample;
—test time.
Attachment description:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Explosion-Proof Electrical Equipment. This standard is drafted by the Nanyang Explosion-proof Electrical Research Institute of the Ministry of Mechanical and Electronic Industry, the Jiamusi Explosion-proof Electrical Research Institute, and the Chongqing Branch of the General Research Institute of Coal Science.
The main drafters of this standard are Mei Zhifen, Deng Yonglin and Zhang Pingyi.13 Partial discharge level test of voltage transformers The partial discharge level test of voltage transformers must comply with relevant standards. 6 Inspection procedures
6.1 The inspection procedures for cast-type electrical equipment and cast-type components manufactured in accordance with this standard must comply with the provisions of Chapter 31 of GB3836.1. 6.2 In addition to the relevant provisions of Chapter 4 of GB3836.1, the type inspection of cast-type electrical equipment and cast-type components must also be conducted with the following tests:
6.2.1 The sealing agent must be tested Dielectric strength test (Article 5.1.1), water absorption test (Article 5.2) and light resistance test (Article 5.3). 6.2.21 Category 21 electrical equipment or components must take 3 samples for the following tests: a. The first sample is subjected to surface resistance test (Article 5.4), temperature test (Article 5.7), cable pull-out test (Article 5.11), heat resistance test Test (Article 5.5), cold resistance test (Article 5.6), thermal cycle test (Article 5.8), dielectric strength test (Article 5.1.2) and mechanical test (Article 5.10); b. The second sample is subjected to grease resistance test (Article 5.8) 5.9) and mechanical testing (5.10); c. The third sample is subjected to water resistance test (Article 5.9) and mechanical test (Article 5.10). 6.2.3 Class III electrical equipment or components must take 2 samples for the following tests: a. The first sample is subjected to surface resistance test (item 5.4), temperature test (item 5.7), cable pull-out test (item 5.11), and heat resistance test (Article 5.5), cold resistance test (Article 5.6), thermal cycle test (Article 5.8), dielectric strength test (Article 5.1.2) and mechanical test (Article 5.10); b. The second sample is subjected to heat resistance test (Article 5.5 Article), cold resistance test (Article 5.6) and mechanical test (Article 5.10). 6.2.4 Batteries and accumulators must undergo discharge tests (Article 5.12). If the sealed battery or accumulator is used in conjunction with other power sources and has an electrical connection, a dielectric strength test (Article 5.1.2) must also be performed. 6.3 Factory inspection
Each product must be inspected and tested according to the following items and meet the technical requirements. Visual inspection of encapsulated electrical equipment or encapsulated components. For acceptance criteria, see Section 5.8.2. 6.3.1
6.3.2 The dielectric strength test must be carried out according to Article 5.1.2 between the following parts: between independent circuits that can be accessed from the outside of the equipment; a. (can be connected together) and external metal parts; b.
Between an externally accessible circuit with an operating voltage of not less than 60V and an externally accessible part adjacent to the circuit. c.
Check the electrical performance (such as voltage, current, power, etc.), which must comply with the technical standards of the proposed inspection unit 6.3.3
GB 3836.9-90
6.3.4- The partial discharge level of the voltage transformer with a voltage higher than 1KV must comply with the relevant standards. The marking | Supplement the following content:
a. Input and output electrical data, such as voltage, current, etc. 8. External breaker data (when needed): c. Allowable short-circuit current (if not 4000A specified in 5.4) UI
0.9~1.1U
(Tamax+10±2)t
+21±2
TAm
+2
In the picture: TAmax
TA min -
U.
tga
AT<±2K
AT2K
>1h||tt ||GB3836.9—90
Appendix A
Test process diagram of thermal cycle test
(reference)
AT4.2K
tga< 2K/h
0.5h
T±2T±2T±2T±2K
Figure A1
Maximum ambient temperature in specified operation; specified operation Minimum ambient temperature; rated voltage:
Temperature change rate:
The temperature difference between the inside and outside of a sample;
AT
U——The voltage applied to the sample ;
T—temperature of sample;
—test time.
Attachment description:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Explosion-Proof Electrical Equipment. This standard is drafted by the Nanyang Explosion-proof Electrical Research Institute of the Ministry of Mechanical and Electronic Industry, the Jiamusi Explosion-proof Electrical Research Institute, and the Chongqing Branch of the General Research Institute of Coal Science.
The main drafters of this standard are Mei Zhifen, Deng Yonglin and Zhang Pingyi.13 Partial discharge level test of voltage transformers The partial discharge level test of voltage transformers must comply with relevant standards. 6 Inspection procedures
6.1 The inspection procedures for cast-type electrical equipment and cast-type components manufactured in accordance with this standard must comply with the provisions of Chapter 31 of GB3836.1. 6.2 In addition to the relevant provisions of Chapter 4 of GB3836.1, the type inspection of cast-type electrical equipment and cast-type components must also be conducted with the following tests:
6.2.1 The sealing agent must be tested Dielectric strength test (Article 5.1.1), water absorption test (Article 5.2) and light resistance test (Article 5.3). 6.2.21 Category 21 electrical equipment or components must take 3 samples for the following tests: a. The first sample is subjected to surface resistance test (Article 5.4), temperature test (Article 5.7), cable pull-out test (Article 5.11), heat resistance test Test (Article 5.5), cold resistance test (Article 5.6), thermal cycle test (Article 5.8), dielectric strength test (Article 5.1.2) and mechanical test (Article 5.10); b. The second sample is subjected to grease resistance test (Article 5.8) 5.9) and mechanical testing (5.10); c. The third sample is subjected to water resistance test (Article 5.9) and mechanical test (Article 5.10). 6.2.3 Class III electrical equipment or components must take 2 samples for the following tests: a. The first sample is subjected to surface resistance test (item 5.4), temperature test (item 5.7), cable pull-out test (item 5.11), and heat resistance test (Article 5.5), cold resistance test (Article 5.6), thermal cycle test (Article 5.8), dielectric strength test (Article 5.1.2) and mechanical test (Article 5.10); b. The second sample is subjected to heat resistance test (Article 5.5 Article), cold resistance test (Article 5.6) and mechanical test (Article 5.10). 6.2.4 Batteries and accumulators must undergo discharge tests (Article 5.12). If the sealed battery or accumulator is used in conjunction with other power sources and has an electrical connection, a dielectric strength test (Article 5.1.2) must also be performed. 6.3 Factory inspection
Each product must be inspected and tested according to the following items and meet the technical requirements. Visual inspection of encapsulated electrical equipment or encapsulated components. For acceptance criteria, see Section 5.8.2. 6.3.1
6.3.2 The dielectric strength test must be carried out according to Article 5.1.2 between the following parts: between independent circuits that can be accessed from the outside of the equipment; a. (can be connected together) and external metal parts; b.
Between an externally accessible circuit with an operating voltage of not less than 60V and an externally accessible part adjacent to the circuit. c.
Check the electrical performance (such as voltage, current, power, etc.), which must comply with the technical standards of the proposed inspection unit 6.3.3
GB 3836.9-90
6.3.4- The partial discharge level of the voltage transformer with a voltage higher than 1KV must comply with the relevant standards. The markings | Supplement the following content:
a. Input and output electrical data, such as voltage, current, etc. 8. External breaker data (when needed): c. Allowable short-circuit current (if not 4000A specified in 5.4) UI
0.9~1.1U
(Tamax+10±2)t
+21±2
TAm
+2
In the picture: TAmax
TA min -
U.
tga
AT<±2K
AT2K
>1h||tt ||GB3836.9—90
Appendix A
Test process diagram of thermal cycle test
(reference)
AT4.2K
tga< 2K/h
0.5h
T±2T±2T±2T±2K
Figure A1
Maximum ambient temperature in specified operation; specified operation Minimum ambient temperature; rated voltage:
Temperature change rate:
The temperature difference between the inside and outside of a sample;
AT
U——The voltage applied to the sample ;
T—temperature of sample;
—test time.
Attachment description:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Explosion-Proof Electrical Equipment. This standard is drafted by the Nanyang Explosion-proof Electrical Research Institute of the Ministry of Mechanical and Electronic Industry, the Jiamusi Explosion-proof Electrical Research Institute, and the Chongqing Branch of the General Research Institute of Coal Science.
The main drafters of this standard are Mei Zhifen, Deng Yonglin and Zhang Pingyi.5h
T±2T±2T±2T±2K
Figure A1
The specified maximum ambient temperature in operation; the specified minimum ambient temperature in operation; Rated voltage: || tt||Temperature change rate:
The temperature difference between the inside and outside of a sample;
AT
U——the voltage applied to the sample;
T——sample temperature;
a test time.
Attachment description:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Explosion-Proof Electrical Equipment. This standard is drafted by the Nanyang Explosion-proof Electrical Research Institute of the Ministry of Mechanical and Electronic Industry, the Jiamusi Explosion-proof Electrical Research Institute, and the Chongqing Branch of the General Research Institute of Coal Science.
The main drafters of this standard are Mei Zhifen, Deng Yonglin and Zhang Pingyi.5h
T±2T±2T±2T±2K
Figure A1
The specified maximum ambient temperature in operation; the specified minimum ambient temperature in operation; Rated voltage: || tt||Temperature change rate:
The temperature difference between the inside and outside of a sample;
AT
U——the voltage applied to the sample;
T——sample temperature;
a test time.
Attachment description:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Explosion-Proof Electrical Equipment. This standard is drafted by the Nanyang Explosion-proof Electrical Research Institute of the Ministry of Mechanical and Electronic Industry, the Jiamusi Explosion-proof Electrical Research Institute, and the Chongqing Branch of the General Research Institute of Coal Science.
The main drafters of this standard are Mei Zhifen, Deng Yonglin and Zhang Pingyi.
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