Quality standard for power transformer core inspection?
[Solutions] 1. The iron core should be flat, the insulation film should not fall off, the laminations should be tight, and the side silicon steel plates should not be warped or wavy. The surfaces of the iron core parts should be free of grease and impurities, and there should be no short circuit between the plates. Lap phenomenon, seam gap meets requirements
2. The iron core and the upper and lower clamps, square iron, pressure plate, and foot plate should maintain good insulation;
3. There should be a clear uniform gap between the steel pressure plate and the iron core; the insulating pressure plate should be kept intact, free of damage and cracks, and have a suitable tightness;
4. The steel pressure plate shall not constitute a closed loop, but should be grounded at the same time;
5. After opening the connecting piece between the upper clamp and the iron core and the connecting piece between the steel pressure plate and the upper clamp, measure the insulation resistance between the iron core and the upper and lower clamps and between the steel pressure plate and the iron core, and compare it with previous tests. No significant changes;
6. The bolts are fastened, the positive and negative pressure nails on the clips and the lock nut are not loosened, and they are in good contact with the insulating gaskets, there is no discharge burn marks, and there is a sufficient distance between the back pressure nails and the upper clips;
7. Through-bolt fastening, its insulation resistance has no obvious change compared with previous tests;
8. The oil path should be unblocked, and the oil path pads should not be detached or blocked, and should be arranged neatly;
9. The iron core is only allowed to be grounded at one point. The grounding sheet is made of copper sheet with thickness of 0.5mm and width of not less than 30mm, inserted between 3rd and 4th iron cores. The insertion depth of large transformers is not less than 80mm. The exposed part of the iron core should be insulated and insulated. Short circuit core;
10. It should be fastened with sufficient mechanical strength. The good insulation does not constitute a loop and does not come into contact with the iron core.
11. Good insulation and reliable grounding.
The above content is based on the problems encountered by the students in the actual work, for reference, if you have any questions, please communicate and correct.
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