The probability of short circuit faults in dry-type air-core reactor is extremely high

there are always huge adverse effects if not eliminated in time.However

there exist low accuracy and sensitivity with the traditional fault detection method when detecting the early failure or minor turn-to-turn short circuit faults in dry-type air-core reactor.This paper proposes a fault detection method of turn-to-turn short circuit of dry-type air-core reactor based on magnetic field detection method.Firstly

the sampled data are smoothed by using the sliding mean method.Then

the turn-to-turn failure can be determined according to the error limit of the control model.In this way

the online monitoring and early warning of the turn-to-turn short circuit fault is realized timely in the initial and developing period

with high accuracy.Engineering verification shows that the signal intensity can be increased by 50-100 times with the proposed method compared to traditional method

and proposed method performs good reliability and stability.The method proposed is able to be applied in the engineering application and expected widespread applications in power systems.