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We have a 15 MW power plant and we are evacuating power to CSPDCL through 132 KV switch yard. In our switch yard the metering and protection potential transformers are bursting out frequently (5 times in 3 years). We discussed with consultants and improved earthing of switch yard. But still the problem continues. During heavy lightning and rain the PTs are bursting. Can any one tell me what will be the reason for this and how to prevent the same?