The disconnection of breaker control circuit is a critical defect that seriously endangers the safe operation of power grid,and its hidden development increases the probability of circuit breaker refusing to operate.As a part of the reclosing function of breaker protection,GST connection will cause the circuit breaker to have a hidden failure in which the control circuit is disconnected and cannot be alarmed under special circumstances.The design,principle and function of secondary circuit of GST connection in breaker protection are analyzed and studied through practical cases.Finally,the improvement measures are put forward according to the sufficient conditions for hidden failure.
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