The reasons for the transformer backup protection action are as follows:
(1) short circuit on the high voltage side of the transformer.
(2) transformer low voltage bus short circuit.
(3) Due to the failure in the differential protection range, the differential protection fails.
(4) backup protection misoperation.
(5) the low voltage line fault, the outgoing line protection refused to move, causing the transformer overload trip.
The principle of treatment is:
(1) if the over-current protection action, found voltage drop, impact, arc, sound and other phenomena, should be checked outside the transformer; If the fault can be removed in time, it can be sent once, otherwise safety measures should be taken to prepare for emergency repair; If no problem is found, you can also send a trial; For transformers without differential protection, in addition to external inspection, insulation inspection should also be carried out.
(2) if the low-voltage outgoing line fails, the line protection refuses to move, you can manually knock out the fault line switch, and then send power to the transformer.
(3) If the differential protection fails due to failure within the range of differential protection, it should be handled according to the differential protection action.
(4) If it is a fault of the secondary circuit, it is a fault of operation or collision, and the personnel on duty can immediately try to transmit power.
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