Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T 6484-1992
Electro-refined explosion-proof transformers
1992-08-06 Issued
Implementation of the Ministry of Machinery and Electronics Industry of the People's Republic of China on 1993-01-01
Mechanical Industry Standard of the People's Republic of China
Electro-refined explosion-proof transformers
Subject content and scope of application
JB/T6484-1992
This standard specifies the structural type, technical requirements, test methods, acceptance rules, packaging, transportation and storage of oil conservators for oil-immersed transformers.
This standard is applicable to oil conservators for oil-immersed transformers. Reference standards
GB191 Pictorial symbols for packaging, storage and transportation.
ZBK45015 Gas relay.
JB/T5345 Butterfly valve for transformers.
Terms, definitions
3.1 Oil conservator
An oil protection device used to meet the volume change of transformer oil and delay the oil aging process. 3.2. Oil level mark
The mark of the maximum oil level, minimum oil level and temperature setting point specified for the oil conservator. 4
Structural type
4.1 Dispersed type: The transformer oil is connected to the atmosphere through the absorber. It is mainly composed of a cabinet, oil filling and draining plugs, an oil level gauge, a desiccant and an oil level mark. It can meet the volume expansion and contraction of the transformer oil caused by the change of temperature. The desiccant can absorb moisture in the air and play the role of oil protection (see Figure A1).
4.2 Sealed type: The transformer oil is isolated from the air. It is mainly composed of a cabinet, a diaphragm (or capsule), an oil level gauge, oil filling and draining plugs, a dirt collection box and a desiccant. The diaphragm (or capsule) isolates the oil from the air, preventing the infiltration of oxygen and moisture in the air, which can extend the service life of the transformer oil and has a good anti-oil aging effect (see Figure A2 and Figure A3). 5
Technical requirements
5.1 The manufacture of oil conservators shall comply with the provisions of this standard and be manufactured in accordance with the drawings and technical documents approved through the prescribed procedures. 5.2 The oil conservator shall specify the minimum oil level line and the maximum oil level line to ensure that after the transformer is matched and selected, the oil level line is visible at the lowest oil level and the oil conservator oil does not overflow at the highest oil level.
5.3 The oil level of the oil conservator shall have a clear indication (red float or pointer), and there shall be a striking oil level line mark or indication scale, with three position marks of -30, +20℃, and +40℃ (normal use conditions). 5.4 The sealed oil conservator shall use a rubber diaphragm (or capsule) that is oil-resistant, gas-proof, oil-diffusion-proof, high in tensile strength and good in aging resistance. The capsule should be able to withstand a 20kPa pressure test without leakage. 5.5 The oil storage cabinet should be able to withstand a 50kPa pressure test for 30 minutes without leakage and permanent deformation. 5.6 Before welding the cabinet, the rust, oil stains, mud stains, etc. on the inner and outer surfaces of the cabinet wall, cabinet cover, coupling pipe, bracket and other parts should be removed. Approved by the Ministry of Machinery and Electronics Industry on August 6, 1992 and implemented on January 1, 1993
JB/T 6484—1992
5.7 After the oil level gauge is welded, the vertical center line of the oil level gauge should be aligned with the vertical line of the cabinet end face, and the allowable deviation should not exceed 3mm. 5.8 When welding the coupling pipe to the cabinet, the dimensional deviation between the horizontal center line of the coupling pipe and the horizontal center line of the cabinet wall b should not exceed 2mm, the inclination a of the flange end face and the plumb plane should not exceed 2mm, and the angle between the horizontal center line of the coupling pipe and the vertical center line of the wall should be 90°, and the deviation should not exceed 2°. (See the figure below). - Vertical center line of oil level gauge
5.9 Length of connecting pipe extending into cabinet wall
a: The connecting pipe without gas relay extends into cabinet wall 15~20mm; b. The connecting pipe with gas relay extends into cabinet wall 30~40mm. 5.10 After welding, the internal surface and external welding line of the cabinet body should be smooth and flat, and there should be no protruding sharp corners or burrs. There should be no pitting or scratches on the external surface, and welding defects such as pores, undercuts, and slag inclusions on the welding line are not allowed. 5.11 The position of the gas box, lifting ring, and plug of the oil storage cabinet should be welded and installed correctly, and the position deviation should not exceed 3mm5.12 There should be no welding slag, sand and dust and other debris in the oil storage cabinet, and the paint color, variety and technical requirements of the internal and external surfaces should be the same as those of the transformer oil tank used.
5.13 The sealing gasket used in the oil storage cabinet should have oil resistance and aging resistance. 5.14 The use of magnetic needle oil level gauge should ensure that the connecting rod is flexible, the indication is accurate, and the limit position alarm is correct. 5.15 The whole machine action test should be carried out before the oil conservator leaves the factory (it can also be carried out together with the transformer). And check whether the diaphragm (or capsule) is leaking and whether the oil level gauge indicates accurately.
5.16 The purchased parts used in the oil conservator must be inspected and qualified before they can be assembled. The diaphragm (or capsule), desiccant, oil level gauge, butterfly reader, gas relay, etc. should all comply with the relevant standards.
Test method
6.1 Sealing test: According to Article 5.5, seal all parts of the oil conservator, and then fill it with 50kPa pressure for 3Gmin to check whether the welding wire and the connection seal are leaking. The test method can be air pressure, water pressure, or oil pressure according to the specific situation. However, after the water pressure test, it must be dried before oil filling.
6.2 Leakage test of capsule: According to the provisions of Article 5.4, connect the capsule to the air source equipped with a pressure gauge, then fill it with 20kPa air pressure, seal the air inlet, and check for leakage by immersing in water or applying liquid. 6.3 Action test: The diaphragm oil storage cabinet should be tested for whole machine action in accordance with Article 5.15. During the test, fill oil from the bottom of the oil storage cabinet to slowly raise the diaphragm, raise it to the highest position to discharge the gas in the diaphragm, then return to the lowest oil level, and then refill oil to reach the specified oil level 2
JB/T6484-1992
line. Check whether the diaphragm has leakage, whether the connecting rod is flexible, whether there is any jamming, and whether the oil level gauge indication and alarm position are accurate. 1
Acceptance rules
7.1 Appearance inspection shall be carried out in accordance with Articles 5.2, 5.3, 5.7, 5.8, 5.9, 5.10, 5.11 and 5.12, and shall be measured visually and with rulers, calipers, etc. 7.2 Inspection of purchased parts shall be carried out in accordance with Articles 5.4 and 5.16, requiring products to have certificates of conformity and test reports, and installation dimensions to comply with relevant standards.
7.3 Sealing performance shall comply with Articles 5.4 and 5.5 of this standard. 7.4 Action test shall comply with Article 5.15 of this standard. 8
Packaging, transportation and storage
8.1 During disassembly, storage and transportation, the oil storage cabinet shall not be rolled, hit or stacked to prevent damage and deformation. If there is damage and shedding of the paint film, it shall be repainted before leaving the factory.
8.2 The packaging, transportation and storage marks of the oil storage cabinet shall comply with the provisions of GB191. Gas relays, oil level gauges (tube oil gauges with a length of more than 740mm), desiccant, etc. shall be packaged, stored and transported separately. Magnetic needle oil level gauges can also be transported without disassembly, but the connecting rod should be fixed to the cabinet body and tied firmly. The meter head should have a protective cover to prevent knocking against the surface glass. 8.3 All external connection pipe openings of the oil storage cabinet must be closed to keep the interior clean. JB/T6484-1992
Schematic diagram of the structure of oil conservator for transformer
(reference)
Figure A1 Schematic diagram of the structure of open oil conservator
1. Cabinet cover
2. Cabinet body
3. Plug
Filter level meter
5. Cabinet foot
6. Drain plug
Figure A2 Schematic diagram of the structure of sealed (diaphragm) oil conservator 1. Cabinet body 2. Diaphragm 3. Vent plug 4. Inspection Yin 5. Pipe joint 6. Connecting rod 7. Magnetic needle Oil level gauge
8, drain plug
9, gas collecting box
10, vent pipe joint 11, pipe joint 12, oil filling and drain pipe 13 dirt collecting gold Additional instructions:
JB/T6484—1992
Figure A3 Schematic diagram of the structure of sealed (capsule) oil storage cabinet 1, capsule 2, vent plug 3, oil level gauge 4, oil filling and drain pipe 5, pipe joint 6, dirt collecting box
7, desiccant
This standard was proposed and managed by Shenyang Transformer Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shenyang Transformer Research Institute. The main drafters of this standard are Jiang Bin and Zhong Qing. People's Republic of China
Mechanical Industry Standard
Electro-Refined Explosion-Proof Transformer
JB/T 64841992
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing
Postal Code 100044)bzxZ.net
1/16 Printing Sheet 1/2
: Word Count 10.000
Format 880×1230
2nd Printing in April 2001
Price 10.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn668
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