Transformer differential protection method and device based on current transformer disconnection
A current transformer and differential protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of differential protection misoperation, differential protection refusal to operate, etc.
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[0079] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0080] The transformer differential protection method based on the disconnection of the current transformer is mainly used in the transformer protection device of the smart grid. The protection equipment sends out an alarm signal to notify the dispatcher to cut off the power of the transformer for maintenance through load reversal, so as to avoid the tripping of the main transformer caused by the disconnection of the secondary circuit of the current transformer. If the differential current of the line increases to the setting value of open differential protection for disconnection, an alarm signal will be issued and the differential protection will be opened to remove the fault and avoid the expansion of the accident.
[0081] Taking the 220kV transformer as an example, the main wiring diagram is as follows figure 1 shown. During normal operation, the circu...
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