Transformer core why to ground?
2016/11/13 view:
Normal operation of the power transformer, the core must be a little reliable grounding. If there is no ground, then the core of the floating voltage, will cause the core to ground intermittent breakdown discharge, the core one point after grounding to eliminate the formation of iron core potential of the suspension. But when two or more core grounding, the uneven potential between the core will be in the ground between the formation of circulation, and cause core multi-point ground heating failure. Transformer core ground fault will cause the core of local overheating, serious, core local temperature rise, light gas action, and even will cause heavy gas action and trip accident. The local core of the melting of the formation of short-circuit between the core chip failure, the iron loss becomes larger, seriously affecting the performance of the transformer and the normal work, as well as the need to replace the core silicon steel sheet to be repaired. So the transformer does not allow multi-point grounding only and only one point ground.
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