GB 3836.6-1987 Explosion-proof electrical equipment for explosive environments, oil-filled electrical equipment "o" GB3836.6-1987 Standard download and decompression password: www.bzxz.net

1. Reference
National Standard of the People's Republic of China
Explosion-proof electrical equipment for explosive atmospheres
Oil-filled electrical equipment "o"
Electrical apparatus for explosive atmospheresOil immersed electrical apparatus \o\1.1 This standard applies to oil-filled electrical equipment. UDC621.3-78:622
.81
GB3836.6-87
1.2 In addition to complying with this standard, oil-filled electrical equipment must also comply with GB3836.1-83 Relevant provisions of "General Requirements for Explosion-Proof Electrical Equipment for Explosive Atmospheres".
2 Glossary
2.1 Oil-filled electrical equipment "
Electrical equipment in which all or part of its components are immersed in oil so that the equipment cannot ignite explosive mixtures above the oil level or outside the enclosure. Equipment. 2.2 Oil
Mineral oil that meets the requirements of GB2536-81 "Transformer Oil". 3. Structural requirements
3.1 Oil-filled electrical equipment must be made into fixed equipment. It can effectively prevent the intrusion of external dust or moisture, and must be able to discharge the gas or vapor released from the oil.
3.2.1 The protection grade of the shell must be no less than IP43. 3.2.2 The shell must be equipped with an exhaust system. Air holes and oil drain holes. For small switches with a rated capacity not greater than 1kVA, a rated voltage not greater than 380V, and a breaking capacity not exceeding 25kVA, the air vents and oil drain holes are not required. 3.2.3 When the shell is equipped with an oil drain hole, The oil drain hole bolt plug must be screwed in at least 5 times, and the sealing performance against oil must be ensured. 3.2.4 When the housing is equipped with a vent, the protection level of the vent must be no less than IP41. 3.2.5 The sealing of the housing. Parts, such as gaskets, sealing rings, etc., must be made of oil-resistant materials. 3.3 Bolts, nuts, and oil-draining and oil-filling bolt plugs used for shell connections, electrical connections, and mechanical connections must have anti-loosening measures. An oil level indicator must be provided, and the oil level indicator must comply with the requirements of Sections 3.4.1~3.4.4. 3.4.1 During normal operation of the electrical equipment, the maximum and minimum oil levels allowed must have easy-to-observe marks. , and the influence of temperature must be considered.
3.4.2 When the oil level indicator is damaged and the internal oil flows out or leaks, the minimum oil level that can ensure the safe operation of the electrical equipment must be 3.4.3. Under the long-term action of oil, it will not be damaged, deformed and reduce transparency. 3.4.4 The observation window must be a solid, easy-to-replace oil-sealed structure, and must be set in a position that is not susceptible to external impact. 3.5 The housing must be tilted when filling with oil. , the inner surface must be equipped with the specified oil level mark in the tilted state. 3.6 Allowable temperature: bzxZ.net
3.6.1 The allowable temperature of the oil must not exceed +100°C. Approved by the National Bureau of Standards 1987-06-18| | tt | Chapter 5.
3.7 During normal operation, parts that generate sparks, arcs or dangerous temperatures must be immersed in oil to a depth that does not ignite explosive gas mixtures on the oil surface. The specific values ??are specified in Chapter 5. Determined by the specified test, but at least not less than 25mm. 3.8 Live parts that do not produce sparks, arcs or dangerous temperatures during normal operation may be immersed in oil according to Section 3.7; the electrical gaps and parts that are not immersed in oil may also be used. The creepage distance must comply with the provisions of Chapter 5 and Chapter 6 of GB3836.3-83 "Explosion-proof Electrical Equipment for Explosive Environments and Increased Safety Electrical Equipment "e"". 3.9 For electrical equipment with a rated voltage exceeding 1kV, all conductors penetrating the oil surface must be insulated, except those with a single-pole structure. The conductor insulation must extend not less than 10mm above the highest oil level and below the lowest oil level. Its construction and arrangement shall be such as to prevent any discharge on the oil surface and shall prevent the loss of oil by capillary action or siphoning action. 3.10 The insulation of electrical components, cables, and wires in contact with oil or oil vapor must be oil-resistant. 4 Special Provisions
4.1·Switches and Controllers
4.1.1 Switches and controllers, such as circuit breakers, load switches, starters, controllers, etc., the allowable switching capacity must not exceed the 75% of the maximum safe making and breaking capacity determined by the test in Chapter 5. 4.1.2 Heating elements, main circuit starters, regulators and controllers under the oil surface must be equipped with protective devices. When the oil temperature exceeds 100°C, or when the maximum surface temperature of the oil exceeds the allowable value specified in Section 3.6.2, the protection device must be able to automatically cut off the power supply. 4.2 Transformers
Non-airtight oil-filled transformers must be equipped with oil expanders (except Class I oil-filled transformers), and must be equipped with protective devices to ensure that the power supply can be automatically cut off when one of the following conditions occurs. a. When there is a fault inside the transformer;
b When the oil temperature exceeds the specified allowable value.
5 Test
In addition to the relevant provisions of Chapter 4 of GB3836.1, the test of electrical equipment must also be conducted with the following supplementary tests. 5.1 Determination of oil temperature
Under rated operating conditions, the limit temperature rise of the oil must comply with the following regulations: a. For equipment in groups T1 to T5, it shall not be higher than +60°C; b. For equipment in group T6, it shall not be higher than +40°C. 5.2 Ignition test
Electrical equipment that generates sparks or arcs under normal operating conditions must undergo this test. 5.2.1 The test is conducted under the following conditions:
Oil temperature under rated working conditions;
a.
b, the lowest oil level under conditions where the oil level indicator may be damaged; c .1.1 times rated voltage;
d． Power factor specified in the technical specifications of the corresponding product. 5.2.2 The space above the oil surface is filled with a mixture of 24±1% hydrogen and air. 5.2.3 Carry out the making and breaking capacity test of the rated making and breaking current of the electrical equipment. When the explosive gas mixture in the space above the oil surface is not ignited after 10 tests, it is confirmed that the switching capacity of this test is the maximum safe switching capacity of the electrical equipment. The explosive gas mixture should be replaced after each test. 6 Marking
GB 3836.6-87
In addition to the markings specified in Chapter 30 of GB3836.1, the nameplate of electrical equipment must also indicate the allowable switching capacity specified in Section 4.1.1.
This standard is proposed by the National Technical Committee for Standardization of Explosion-Proof Electrical Equipment. This standard was drafted by the Nanyang Explosion-proof Electrical Research Institute of the Ministry of Machinery Industry at its expense. The main drafters of this standard are Yang Yong, Ma Jingna, Li Xiaoquan, Ren Jiazhi, and Shi Fusheng. F
This standard is entrusted to the National Technical Committee for Standardization of Explosion-Proof Electrical Equipment to be responsible for interpretation.
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