How Does Overload Operation Of A Constant Voltage Transformer Lead To A Short Circuit To Ground?

During operation, if the current carried by coil 3 phase constant voltage transformer continuously exceeds its rated capacity, coil constant voltage transformer for home will experience abnormal temperature rise. This temperature increase will gradually degrade the winding insulation material, reducing its resistance to ground. When the insulation level drops to a certain critical value, it will cause the insulation between the winding and the casing or ground to break down, resulting in a short circuit to ground. As the load increases, leakage flux and additional losses in the coil will also increase, accelerating the failure of internal oil or solid insulation and creating micro-discharge paths, ultimately leading to the formation of a path to ground. If the overload persists, the combined effect of thermal expansion and mechanical stress in the winding will cause it to move or contact the casing. The weakest point in the insulation may fail first, causing a short circuit to ground.