Study on Inter-turn Short Circuit Fault Monitoring of Dry-type Air-core Reactor Based on Phase Difference Change
Dry-type air-core reactor is one of the important equipment in power system,and its failure mode is mainly inter-turn short circuit.It is therefore of great significance to issue effective warning in the early stage of inter-turn short circuit fault.In case of healthy operation of the dry-type air core reactor,the phase difference of voltage and current is a fixed value,and the phase difference changes after inter-turn short circuit.Based on this,a kind of online monitoring method for inter-turn short circuit with phase difference change characteristics is proposed.The field-circuit coupling model of inter-turn short circuit is set up,and the change threshold of phase difference of inter-turn short circuit is set in accordance with the simulation results;SOGI-PLL combined with apFFT algorithm is used to monitor the change characteristics of phase difference in real time.Then,the on-line monitoring system for inter-turn short circuit is set up and its performance is tested.The result shows that the on-line monitoring system can not only find out inter-turn short circuit sensitively,but also measure the phase difference accurately,which meets the requirements of both sensitivity and reliability.The feasibility of inter-turn short circuit monitoring method based on the phase difference change of voltage and current is verified by the research work and a reference for its implementation method is provided.
dry-type air-core reactorinter-turn short circuit faultphase differenceonline monitoringSOGI-PLL combined with apFFT algorithm
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