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Quality standard for power transformer core repair

2019-04-13 16:40:43

1. The iron core should be flat, the insulating paint film does not fall off, and the laminated piece is tight. The silicon steel sheet on the side should not be lifted or undulated, and the surface of each part of the iron core should be free of grease and impurities. There should be no short circuit or overlap between the sheets. , seam clearance meets requirements

2. The iron core should be well insulated from the upper and lower clamps, square iron, pressure plate and foot plate;

3. Transformer core manufacturer's home introduction There must be obvious uniform clearance between the steel pressure plate and the iron core; the insulation pressure plate should be intact, without damage and crack, and have appropriate tightening degree;

4. The steel pressure plate shall not constitute a closed loop and shall be grounded at one point;



5. After opening the connecting piece between the upper clamping piece and the iron core and the connecting piece of the steel pressing plate and the upper clamping piece, the transformer core manufacturer introduces the insulation resistance between the iron core and the upper and lower clamping members and between the steel pressing plate and the iron core, and There should be no significant changes in previous trials;

6. Bolt tightening, the positive and negative pressure nails and the locking nut on the clamp are not loose, and the contact with the insulating gasket is good, there is no discharge burn mark, and the back pressure nail has sufficient distance from the upper clamp;

7. Through-bolt fastening, its insulation resistance has no obvious change compared with previous tests;

8. The oil passage should be unblocked, the oil passage block should not fall off and block, and should be arranged neatly.

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