What are the signs to watch for when a distribution transformer is about to damage?

1. you Neutral connected  point   car-ban /skill show .

2.Cable Primer and Secondary connected point  car-ban /skill show .

3. Cable Megger  testing time leakage current show .

4. Cable high pot test11kv cable &33 kv  Cable high pot test  time leakage current show .

This fault  damage time ..

check its copper sulphate(CuSo4) solution that wiil make sure of its damge...