Why is the core of a power transformer grounded? Why is only one point of grounding allowed

First of all, in order to protect the normal and stable process of power transformer operation, the transformer core must be grounded. If there is no grounding, the core of the suspended voltage to ground, will cause the core to ground intermittent breakdown discharge, this time not only will damage the transformer, but also very dangerous!

At the same time, it should be noted that: the transformer core must be a point of grounding, not two points of grounding, not to mention multi-point grounding.

When the core of two or more points of grounding, the uneven potential between the core will form a loop current between the grounding points, causing the core of the local overheating, resulting in the core of the multi-point grounding heating fault, and even burned metal parts and insulation.

At the same time, the local iron core will form a short circuit failure between the iron chip, so that the iron loss becomes large, seriously affecting the performance of the transformer and normal operation, to the point that must replace the iron core silicon steel sheet to repair. So the transformer is not allowed to multi-point grounding can only have and only a point of grounding.