Transformer differential protection trip inspection process

Transformer differential protection trip, it should be checked and processed as follows: (1) Check the transformer body without exception, porcelain differential within the scope of protection checks whether flashover, damage, if there is a short circuit 2 lead if the transformer differential protection. no significant fault within the device, you should check whether the secondary circuit protection and fault, if there are two DC circuit ground. 3 or more after inspection  electric meter , should be sent immediately after the removal of a load test, and then try to send the trip may not be sending. 4 If the relay or secondary circuit due to failure or  Electric transformer  caused by moving the DC grounding points, differential protection should be out of operation, the transformer power transmission, and then deal with the secondary circuit and DC ground fault.