Detecting structure and method for detecting turn-to-turn insulation fault of electric reactor through oscillation method

Abstract

The invention relates to a detecting structure and method for detecting a turn-to-turn insulation fault of an electric reactor through an oscillation method. The structure comprises a discharging ball gap and a pulse capacitor respectively connected to one end of the electric reactor, wherein the other end of the discharging ball gap is connected to the negative electrode of a power supply, the positive electrode of the power supply is connected to the other end of the reactor, and the other end of the pulse capacitor is connected to the negative electrode of the power supply. Since a discharging ball gap and a pulse capacitor are respectively connected to one end of the electric reactor, the power supply provides electric energy, and the pulse capacitor is charged through the power supply. When the pulse capacitor is charged to a certain value, the discharging ball gap discharges, and the pulse capacitor and the reactor form a damped oscillation circuit of a certain frequency. When turn-to-turn short circuit fault occurs to the reactor, the inductance value is reduced, and the active loss is increased sharply. The wave-shaped oscillation period of the reactor is reduced, and the attenuation speed of amplitude is accelerated, so that presence or occurrence of turn-to-turn short circuit fault of the reactor can be detected accurately. The detecting structure and method are highly practical.

Description

technical field [0001] The invention relates to the technical field of test and detection of power system equipment, in particular to a detection structure and method for detecting inter-turn insulation faults of reactors using an oscillation method. Background technique [0002] Reactor is an indispensable power equipment in the power system. It is widely used in parallel reactive power compensation, current-limiting reactor device to limit inrush current or fault current, and resonant reactor in filter device. With the rapid development of my country's power grid construction, the application of high and medium voltage hollow and core reactors of various voltage levels is becoming more and more common. [0003] Like other electrical equipment, dry-type reactors also have many accidents in actual operation. The actual operation of dry-type reactors at home and abroad and a large amount of data show that the main reason for the damage of dry-type reactors is the defect of t...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a detection structure and method for detecting inter-turn insulation faults of reactors using the oscillation method, aiming to solve the problem of characteristic quantities such as inductance, current, and magnetic field caused by inter-turn faults in dry-type reactors in the prior art The size of the change is closely related to the number of ampere-turns and the number of parallel branches. In the early stage of fault development, these changes are difficult to detect.

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