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GB/T 3836.6-2017 English PDF

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GB/T 3836.6-2017: Explosive atmospheres -- Part 6: Equipment protection by liquid immersion 'o'
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GB/T 3836.6: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 3836.6-2017English359 Add to Cart 4 days [Need to translate] Explosive atmospheres -- Part 6: Equipment protection by liquid immersion 'o' Valid GB/T 3836.6-2017
GB 3836.6-2004English359 Add to Cart 3 days [Need to translate] Electrical apparatus for explosive gas atmosphere -- Part 6: Oil-immersion “o” Obsolete GB 3836.6-2004
GB 3836.6-1987English199 Add to Cart 2 days [Need to translate] Electrical apparatus for explosive atmospheres--Oil immersed electrical apparatuso Obsolete GB 3836.6-1987

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Basic data

Standard ID GB/T 3836.6-2017 (GB/T3836.6-2017)
Description (Translated English) Explosive atmospheres -- Part 6: Equipment protection by liquid immersion ��o��
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K35
Classification of International Standard 29.260.20
Word Count Estimation 18,126
Date of Issue 2017-12-29
Date of Implementation 2018-07-01
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 3836.6-2017: Explosive atmospheres -- Part 6: Equipment protection by liquid immersion “o”

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Explosive atmospheres--Part 6. Equipment protection by liquid immersion “o” ICS 29.260.20 K35 National Standards of People's Republic of China Replace GB 3836.6-2004 Explosive environment Part 6. Equipment protected by liquid immersion "o" Part 6. Equipmentprotectionbyliquidimmersion "o" (IEC 60079-6.2015, MOD) Released on.2017-12-29 2018-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued

Content

Foreword III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Structural requirements 3 4.1 General 3 4.2 Protection levels and electrical equipment requirements 3 4.3 Switchgear 4 4.4 Clearance and creepage distance 4 4.5 Filling the liquid housing 4 4.6 immersion depth 5 4.7 Liquid level display for protective liquid 5 4.8 Temperature Limit 6 4.9 Field wiring connection for liquid immersion equipment 6 4.10 Structural components of the enclosure 6 5 protective liquid 7 5.1 Regulations for the protection of liquids 7 5.2 Other detailed provisions for the protection of liquids 7 5.3 Class I equipment 7 5.4 Liquid contamination and gas evolution that may be caused by arcing 7 5.5 Total volume of protective liquid 7 6 Inspection and test 7 6.1 Type test 7 6.2 Routine test 8 7 logo 9 8 User Manual 9 Appendix A (Normative) Selection and Installation Requirements 10 Appendix B (Normative) Maintenance Requirements 11 Appendix C (Normative) Repair and Maintenance Requirements 12 Reference 13

Foreword

The Explosive Environment is divided into several parts. --- Part 1. General requirements for equipment; --- Part 2. Equipment protected by flameproof enclosure "d"; --- Part 3. Equipment protected by an increased safety "e"; --- Part 4. Equipment protected by intrinsically safe "i"; --- Part 5. Equipment protected by a positive pressure enclosure "p"; ---Part 6. Equipment protected by liquid immersion "o"; ---Part 7. Equipment protected by sand-filled "q"; --- Part 8. Equipment protected by the "n" type; ---Part 9. Equipment protected by the encapsulated type "m"; --- Part 11. Test methods and data for the classification of gas and vapour properties; --- Part 13. Repair, overhaul, repair and modification of equipment; --- Part 14. Location classification of explosive atmospheres; ---Part 15. Design, selection and installation of electrical installations; ---Part 16. Inspection and maintenance of electrical installations; --- Part 17. Structure and use of positive pressure rooms or buildings; --- Part 18. Intrinsically safe electrical systems; --- Part 19. Fieldbus Intrinsic Safety Concept (FISCO); --- Part 20. Equipment with an Equipment Protection Level (EPL) of Class Ga; --- Part 21. Application of equipment production quality system; --- Part 22. Protection measures for optical radiation equipment and transmission systems; --- Part 23. Class I EPLMa class equipment for use in gas and/or coal dust environments; --- Part 24. Equipment protected by special type "s"; This section is part 6 of the Explosive Environment. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB 3836.6-2004 "Electrical equipment for explosive gas atmospheres - Part 6. Oil immersion type "o"", and GB 3836.6- Compared with.2004, the main technical changes are as follows. --- Oil immersion type "o" is redefined as liquid immersion type "o", introducing protection levels "ob" and "oc"; --- Added the terms "isolation switch", "switching device", "safety device", "tap selector" (see 3.7~3.10); ---Modified structural requirements (see Chapter 4, Chapter 4 of the.2004 edition); --- Increased requirements for protecting liquids (see Chapter 5); --- Increase the maximum temperature test and switch test (see Chapter 6); --- Added requirements for additional signs (see Chapter 7); --- Added requirements for the instruction manual (see Chapter 8); --- Increased selection and installation requirements (see Appendix A); --- Increased maintenance requirements (see Appendix B); --- Added repair and overhaul requirements (see Appendix C). This section uses the redrafting method to modify the use of IEC 60079-6.2015 "Explosive environment part 6. protected by liquid immersion type "o" device". The main technical differences between this part and IEC 60079-6.2015 and their reasons are as follows. ---About the normative reference documents, this part has made technical adjustments to apply to China's technical conditions, adjustments The situation is reflected in Chapter 2, “Regulatory References”, and the specific adjustments are as follows. ● Replace ISO 2719 with GB/T 261, IEC 60156 with GB/T 507, and IEC 60296 with GB 2536. Replace ISO 3016 with GB/T 3535, ISO 2592 with GB/T 3536, and replace with GB 3836.1 IEC 60079-0, replace IEC 60529 with GB/T 4208, replace IEC 60247 with GB/T 5654, use GB/T 21218 replaces IEC 60836, uses GB/T 30515 instead of ISO 3104, and replaces with DL/T 285 IEC 62535, replace IEC 61125 with NB/SH/T 0811, replace IEC 62021-1 with NB/SH/T 0836; ● Added reference to GB/T 3836.16 (see Appendix B). ---In the 4.8.2 "maximum surface temperature", add "for Class I equipment, the temperature should not exceed 150 °C" to meet the requirements of China's coal mines. The specific situation of the preparation. This section has made the following editorial changes. --- Note 2 and footnotes of Table 2 were combined. This part was proposed by China Electrical Equipment Industry Association. This part is under the jurisdiction of the National Technical Committee for Standardization of Explosion-proof Electrical Equipment (SAC/TC9). This section drafted by. Nanyang Explosion-proof Electric Research Institute Co., Ltd., National Explosion-proof Electrical Products Quality Supervision and Inspection Center, New Dawn Section Technology Co., Ltd., Huarong Technology Co., Ltd., Nanyang Zhongtian Explosion-proof Electric Co., Ltd. The main drafters of this section. Wang Jun, Li Rui, Zheng Zhenxiao, Zhang Minggao, Zhou Bintao, Liu Yuyun, Sun Jingfu, Zhao Hongyu, Wang Qiaoli. The previous versions of the standards replaced by this section are. ---GB 3836.6-1987, GB 3836.6-2004; Explosive environment Part 6. Equipment protected by liquid immersion "o"

1 Scope

This section of the Explosive Environment specifies the design of Ex equipment and Ex components for use in an explosive atmosphere with a liquid immersion "o". Special requirements for calculations, structures, tests and signs. The Ex device and the Ex component protected by the liquid immersion type "o" form a protection level "ob" (EPL "Mb" or "Gb"), or a protection level "oc" (EPL "Gc"). For the protection level "ob", the rated voltage applicable to this section does not exceed 11kV (AC rms or DC). For the protection level "oc", the rated voltage applicable to this section does not exceed 15kV (AC rms or DC). Note. The requirements for higher voltages are still under investigation. This part is based on the general requirements of GB 3836.1, and has been added and supplemented.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 261 Determination of flash point Binsky-Martin closed cup method (GB/T 261-2008, ISO 2719.2002, MOD) GB/T 507 insulating oil breakdown voltage measurement method (GB/T 507-2002, eqvIEC 60156.1995) GB 2536 Unused mineral insulating oil for electrical fluid transformers and switches (GB 2536-2011, IEC 60296. 2003, MOD) GB/T 3535 petroleum product pour point determination method (GB/T 3535-2006, ISO 3016.1994, MOD) GB/T 3536 Determination of flash point and ignition point of petroleum products Cleveland open cup method (GB/T 3536-2008, ISO 2592. 2000, MOD) GB 3836.1 Explosive atmosphere - Part 1. General requirements for equipment (GB 3836.1-2010, IEC 60079-0.2007, MOD) GB/T 3836.16 Explosive atmosphere - Part 16. Examination and maintenance of electrical installations (GB/T 3836.16-2017, IEC 60079-17.2007, IDT) GB/T 4208 enclosure protection grade (IP code) (GB/T 4208-2017, IEC 60529..2013, IDT) GB/T 5654 Measurement of relative permittivity, dielectric loss factor and DC resistivity of liquid insulating materials (GB/T 5654- 2007, IEC 60247.2004, IDT) GB/T 21218 Electrically used unused silicon insulating liquid (GB/T 21218-2007, IEC 60836.2005, IDT) GB/T 30515 Transparent and opaque liquid petroleum products, kinematic viscosity measurement method and dynamic viscosity calculation method (GB/T 30515- 2014, ISO 3104.1994, MOD) DL/T 285 Mineral Insulating Oil Corrosive Sulfur Detection Method Wrapped Insulation Paper Copper Flat Wire Method (DL/T 285-2012, IEC 62535- 2008, MOD) NB/SH/T 0811 Unused hydrocarbon insulating oil oxidation stability test method (NB/SH/T 0811-2010, IEC 61125. 1992, MOD) NB/SH/T 0836 Determination of acid value of insulating oils - Automatic potentiometric titration (NB/SH/T 0836-2010, IEC 62021-1. 2003, MOD) IEC 60814 Insulating liquid oil-impregnated paper and cardboard water content by Karl Fischer automatic coulometric titration assay (Insulating liquids-Oilimpregnatedpaperandpressboard-Determinationofwaterbyautomaticcoulometric KarlFischertitration) IEC 61099 Insulating Liquids for Electrically Unused Synthetic Organic Ester Specifications (Insulatingliquids-Specificationsfor Unusedsyntheticorganicestersforelectricalpurposes)

3 Terms and definitions

The following terms and definitions as defined in GB 3836.1 apply to this document. 3.1 Liquid immersion type "o" liquidimmersion "o" An explosion-proof type of electrical equipment in which the electrical equipment or electrical equipment components are entirely immersed in a protective liquid so that the equipment cannot ignite the liquid An explosive atmosphere on or outside the enclosure. 3.2 Protective liquid protectiveliquid A liquid that prevents direct contact of explosive gases with potentially ignited sources. 3.3 Sealing equipment sealedequipment By design, its structure can prevent the external explosive gas mixture from expanding and contracting due to internal liquid under normal operating conditions of the equipment. The incoming device, for example, uses an expansion tank method. 3.4 Non-sealed equipment non-sealedequipment By design, its structure allows the external explosive gas mixture to expand and contract due to internal liquid under normal operating conditions of the equipment. And the equipment that enters and exits. 3.5 Maximum allowable protection level maximumpermissibleprotectiveliquidlevel Under normal operating conditions, consider the most unfavorable filling conditions specified by the manufacturer and the maximum ambient temperature specified in the product design. The expansion effect caused by the piece, the highest level that the protective fluid can reach. 3.6 Minimum allowable protection level minimumpermissibleprotectiveliquidlevel Under normal operating conditions, taking into account the most unfavorable liquid filling conditions and the shrinkage effect caused by the conditions at the time of power failure at the lowest ambient temperature, The lowest level of liquid can be reached. 3.7 Isolation switch disconnector In the opening position, there is an insulation distance and an obvious disconnection mark between the contacts in accordance with the specified requirements; in the closing position, it can carry normal Switching device for current under circuit conditions and current under abnormal conditions (eg short circuit) within a specified time. Note. When the loop current is “small”, or when the voltage between the two terminals of each pole of the isolating switch does not change significantly before and after the closing and breaking, the isolating switch Has the ability to close and break the loop. [GB/T 2900.20-2016, definition 6.5] 3.8 Switching device switchingdevice A device for closing and/or opening one or more circuits. [GB/T 2900.20-2016, definition 6.1] 3.9 Safety device safetydevice Used in explosive or non-explosive environments, necessary for safety functions that reduce the risk of explosion of equipment and protection systems, or Equipment for backup and protection systems to reduce the risk of explosion. 3.10 Tap selector tapselector A device that can carry current but cannot turn on or off current, and is used in conjunction with a diverter switch to select a tap connection location. [GB/T 2900.95-2015, definition 5.6.5]

4 Structural requirements

4.1 General The liquid-immersed "o" protected Ex or Ex equipment components are immersed in a protective liquid in such a way that they do not ignite the protective liquid An explosive atmosphere on or outside the enclosure. The structure of the Ex device should be such that there is sufficient protective liquid. Monitoring devices, instructions may be used depending on the expected level of equipment protection A liquid level control safety device with an automatic shut-off switch ensures adequate liquid. Note. The requirements of all electrical equipment in accordance with GB 3836.1 are considered to be in compliance with relevant industrial requirements. The requirements of the GB/T 3836 series of standards are for these workers. Supplement to the industry requirements. 4.2 Protection levels and electrical equipment requirements 4.2.1 Protection level Electrical equipment protected by liquid immersion “o” shall be. a) protection level "ob" (EPLGb or Mb); or b) Protection level "oc" (EPLGc) Unless otherwise specified, the provisions of this section apply to all levels of protection. 4.2.2 "ob" protection level requirements Equipment and components protected by liquid immersion in accordance with the requirements of this section, without ignition capability under normal operating conditions and expected fault conditions, Should be the protection level "ob" (EPLGb or Mb). The liquid level display device shall be configured in accordance with the requirements of 4.7. The protection level "ob" liquid immersion switchgear shall comply with the following additional requirements. a) When a sealed enclosure is used, the enclosure shall be subjected to an overpressure test as specified in 6.1.1 at a test pressure of 4 times the specified pressure; b) Switching devices operating in protective liquids in electrical equipment, if the rated capacity of each contact is not more than 2kVA, it is not required Carry out other tests. If the rated capacity of each contact of the switchgear is greater than 2kVA, test according to the requirements of 6.1.5 At this time, an increase in pressure or an excessive amount of decomposition products should not invalidate the protection pattern; c) The equipment shall be suitable for an expected short-circuit current of 32 kA, except where the expected short-circuit current value is low. Isolation switches and manual tap selectors over 1000V shall be capable of being locked and shall be provided with the warning signs required by Chapter 7 i). this In addition, the instructions should include information on their use. 4.2.3 "oc" protection level requirements Equipment and components protected by liquid immersion in accordance with the requirements of this section are not available under normal operating conditions and expected frequent fault conditions. With ignition capability, it should be the protection level "oc" (EPLGc). The switching device operating in the protective liquid in the electrical equipment does not need to be carried out if the rated capacity of each contact is not more than 10kVA Other tests. If the rated capacity of each contact of the switchgear is greater than 10kVA, the pressure rises when tested in accordance with the requirements of 6.1.5. Or excessive decomposition products should not invalidate the protection pattern. 4.3 Switchgear The switching device is only allowed if the switching operating voltage does not exceed the AC voltage specified in Table 1. DC voltage does not allow the use of switches Device. Table 1 Working voltage Protection level "ob" "oc" Switching device operating voltage 1.0kV (AC RMS) 6.6kV (AC RMS) 4.4 Clearance and creepage distance Circuits and components used for immersion in protective liquids shall comply with relevant industry standards for electrical rooms in air prior to immersion in protective liquids Gap and creepage distance requirements. If the relevant industry standard gives a different level of pollution, it should be considered a level 2 pollution level. 4.5 Filling the liquid housing 4.5.1 Overview Manufacturers should develop documentation specifying the chemical resistance of the enclosure to protect the liquid. Note. This section does not require verification of the chemical resistance of the enclosure to the protective liquid. For sealed and unsealed enclosures, the type test specified in Chapter 6 shall be performed separately. Insulating bushings for wire terminal connections shall be considered part of the enclosure and shall comply with the requirements of this chapter. 4.5.2 Sealed enclosure The cover and the outer casing of the sealed casing can be continuously welded together or a gasket seal can be used. If a gasket seal is used, the cover should be used Special fasteners as specified in GB 3836.1. Equipment with a sealed enclosure should be equipped with a pressure relief device. The pressure relief device shall be permanently fixed by the manufacturer of the liquid immersion equipment and installed in the liquid immersion In the type of equipment, the operating pressure should be at least 10 kPa. Permanently sealed outer casing when manufactured, if it does not leave visible traces after opening (certificate According to), the outer casing should not be opened. This type of enclosure shall be identified in accordance with Chapter 7, c). NOTE. Suitable techniques for leaving visible evidence when opening the enclosure. such as welding, brazing, bonded joints, riveting, bonding screws or lead screws. 4.5.3 Unsealed housing The structure of the non-sealed enclosure shall be such that the gas or vapor generated during the normal operation of the protective fluid escapes through the breathing apparatus. Have a suitable desiccant. The manufacturer shall specify the maintenance requirements for the desiccant. 4.5.4 Breathing device or pressure relief device outlet For a respirator of a non-sealed device or a pressure relief device for a sealing device, the discharge opening should be set downwards and at least have The IP66 protection level specified in GB/T 4208. 4.5.5 Expected open enclosure The design of the openable enclosure shall be such that it will not damage the enclosure during repair, refilling and resealing of the equipment. This type of enclosure shall be identified in accordance with Chapter 7, d). 4.5.6 Determining the maximum/minimum parameters of the protective liquid The following parameters should be specified. a) protect the liquid from the highest and lowest liquid levels; b) The maximum angle of inclination of the equipment to the horizontal plane during operation. 4.6 immersion depth Regardless of the orientation of the internal equipment, the live parts of the electrical equipment should be immersed below the lowest possible liquid level, and the immersion depth should be in accordance with Table 2. Provisions. Table 2 immersion depth AC rms or DC voltage a depth Mm Switching device without switch device (AC only) ≤50 3 10 ≤250 5 15 ≤1000 10 20 ≤6000 25 50 ≤10000 25 - ≤13640 50 - a When determining the immersion depth, the operating voltage can be higher than the factor of 1.1 times the voltage in the table. Note that when using a factor of 1.1, multiple in one circuit Where the working voltage is equal to the rated voltage, only some commonly used rated voltages can use a factor of 1.1. 4.7 Liquid level display for protective liquid 4.7.1 Overview A level display device that meets the following requirements should be provided to facilitate checking the level of each individual filled liquid in operation. The maximum and minimum liquid levels allowed for protection of liquids during normal operation shall be identified in accordance with Chapter 7 e) and shall be considered in the ambient temperature specified by the manufacturer. Expansion and contraction due to changes in operating temperature within the range. The liquid level display device shall be marked in accordance with Chapter 7 f) and used to indicate that the electrical equipment shall be filled when filled at the liquid filling temperature specified by the manufacturer. Filling level. Alternatively, a sign is placed adjacent to it, and the filling condition is specified in detail. Consider the expansion and contraction due to changes in operating temperature within the ambient temperature range specified by the manufacturer, the position of the liquid level display device It should be ensured that the minimum liquid level that the protective liquid may display cannot be lower than the value specified in 4.6. Manufacturers should develop documentation describing the protective fluid The transparent member retains its mechanical and optical properties when in contact. For non-sealed equipment, a liquid level gauge can be used. In normal operation, the liquid level gauge is fixed at the measuring position and is guaranteed to meet the requirements of 4.5.1. begging. In the adjacent area, the warning sign should be set according to Chapter 7 g). 4.7.2 Remote level display If a remote level display is used, the position of the switching element should be lower than the position of the sensor element, at least as specified in Table 2, or should be used Another suitable type of explosion protection. If the manufacturer does not provide a remote level display, it should be in accordance with the requirements of GB 3836.1 The symbol "X" is added after the certificate number is issued, and all the information required by the user should be specified in the special use conditions specified in the explosion-proof certificate. The warranty is in accordance with the requirements of this section. 4.7.3 Safety device with protection level "ob" For protection class "ob" devices with switching devices, the liquid level safety device shall monitor the liquid level of the protective liquid and reduce it to the liquid level. When the minimum level is below the minimum level, the power is automatically turned off. The position of the switching element of the safety device should be at least lower than the position of the sensing element of the safety device The values specified in Table 2, or another applicable type of explosion protection shall be used. If the manufacturer does not provide a safety device, it should be followed GB 3836.1 mark requirements, add the symbol "X" after the explosion-proof certificate number, and the special use conditions specified in the explosion-proof certificate shall be Determining all the information the user needs to ensure compliance with the requirements of this section. Note. The safety device fault tolerance in these applications is typically 0 and the safety integrity level is SIL1. The requirements for such safety devices are in EN50495 Given. 4.8 Temperature limit 4.8.1 Overview The maximum allowable temperature of the equipment or equipment component shall be equal to the lower of the temperatures determined in 4.8.2 or 4.8.3. 4.8.2 Maximum surface temperature The temperature at which the temperature of the free surface of the liquid is protected or the surface of the electrical equipment is in contact with the explosive atmosphere shall not exceed the temperature. The temperature limit or maximum surface temperature specified by the degree group. In any case, the temperature should not exceed.200 °C. For Class I equipment, the temperature should not More than 150 ° C. 4.8.3 Protecting the flash point of the liquid The flash point of the protective liquid (measured by the closed cup method) should be at least better than the temperature of the free surface of the liquid and the temperature of the internal components immersed in the liquid. The height is 25K. 4.9 Field wiring connection for liquid immersion equipment The liquid immersion protection type is not suitable for field wiring connections. Insulation sleeves should be used to connect through the device housing. Direct use i...

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