Transformer lightning strikes may result in damage to the transformer winding insulation due to overvoltages
Dry coil internal coil will burst open, so that the transformer outside the four sides of the shell will be bulging. Cylinders on the porcelain will burn black, porcelain will be black and cracked. The line breaker is tripped.
Transformer by lightning over-voltage damage, usually the primary coil over-voltage burned one is short-circuit two open. Most of which is caused by the line called the induction mine (lightning) instantaneous damage, the shell (surface) no burn traces. Unless it is just in the transformer over the formation of direct lightning damage effect.
????? Transformer lightning is the most vulnerable to the transformer insulation problem, in fact, the structure of the transformer, insulation is a particularly important assessment factor. Transformer insulation damage, the other performance will be affected, including: three-phase voltage is not balanced, no load and load test pass. Detection method is usually: first with a shake table measured insulation resistance, in the measurement of the winding resistance, and finally can be hanging core to do no load test. You can gradually know what part of the lightning damage!
