As for the frequent occurrence of inter-turn short circuit fault of dry dry-type air-core reactor

the existing monitoring method has such problem as low accuracy

poor reliability and high cost.Therefore

a kind of method of inter-turn short circuit on-line monitoring based on the variation of power factor is proposed.A circuit model for an inter-turn short circuit is established and electrical parameter variation of the faulty reactor at different a numerical valued is calculated and

on this basis

the power factor is determined as the monitored quantity and power factor is obtained by the use of harmonic analysis is obtained and

finally

the test platform is set up for the test study.It is shown by the study result after the short circuit fault the total current becomes small and power factor becomes big remarkably.The variation of various electrical parameters is related to short circuit position.The test result and analysis result is identical

which verifies the correctness and effectiveness of the monitoring method.