Identification method of single-phase disconnection fault in distribution network based on negative sequence voltage and current characteristics
A negative-sequence voltage and negative-sequence current technology is applied in the field of identification of single-phase disconnection faults in distribution networks, which can solve problems such as difficulty in finding and electric shocks to surrounding people and animals, and achieve reliable identification results.
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[0023] The invention aims to solve the problem of single-phase disconnection fault identification in distribution network. It is pointed out that the negative-sequence equivalent network after a single-phase disconnection occurs in the distribution network is as follows: figure 1 shown, where Z in Indicates the equivalent negative-sequence reactance of the i-th outgoing line, load transformer and load, i in Indicates the negative sequence current of the i-th outgoing line, Z mdn i mdn Indicates the equivalent negative sequence reactance and negative sequence current downstream of the fault line, Z mun i mun Indicates the equivalent negative sequence reactance and negative sequence current upstream of the fault line, Z Gn i Gn Indicates the equivalent negative sequence reactance and negative sequence current of the system power supply, Z Ln i Ln Indicates the equivalent negative sequence reactance and negative sequence current of the arc suppression coil, i n Indicates...
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