A detection system for inter-turn insulation defects of dry-type air-core reactor

Abstract

A detection system for inter-turn insulation defects of a dry-type air-core reactor, including a power supply, a current-limiting resistor R, a capacitor C, a high-voltage electronic switch control circuit, a high-voltage electronic switch D, a capacitor voltage divider, and a waveform detection device. The power supply, the current limiting resistor R, the capacitor C and the reactor Lx to be tested are connected in series to form a closed loop, the capacitor voltage divider is connected in parallel with the reactor Lx to be tested, the waveform detection device is connected in parallel with the low-voltage arm capacitor CL of the capacitor voltage divider, and the high-voltage electronics The switch D is connected in parallel with the series branch composed of the capacitor C and the reactor Lx to be tested; the high-voltage electronic switch control circuit controls the on-off of the high-voltage electronic switch to make the capacitor C perform intermittent discharge on the reactor Lx to be tested, and the reactor Lx to be tested A high-frequency pulse oscillation voltage is generated, and the waveform detection device detects the output waveform of the reactor Lx to be tested, and judges whether there is an inter-turn insulation defect in the reactor Lx to be tested. The invention is convenient for accurate control and has little electromagnetic interference, and can effectively detect the inter-turn insulation defects of dry-type air-core reactors.

Description

technical field [0001] The invention relates to a detection system for inter-turn insulation defects of a dry-type air-core reactor. Background technique [0002] The reactor is composed of a plurality of coaxial parallel windings, and each parallel winding is electrically connected in parallel. Each parallel winding is made of multiple parallel copper wires or aluminum wires wound in multiple layers according to design requirements, and each wire is wrapped with polyester film as inter-turn insulation. The outside of the parallel winding is wrapped with glass fibers impregnated with epoxy resin, tightly encapsulated, and cured at high temperature to form a package with good integrity, such as figure 1 As shown, each of the 3 packages is separated by a glass fiber drawing strip 1 to form a heat dissipation air passage. The terminal arm 2 is used as the outlet connection end of the parallel winding, and the upper and lower terminal arms 2 of the parallel winding are fixed b...

AI Technical Summary

Problems solved by technology

However, the ball gap discharge cannot be precisely controlled, and the electromagnetic waves generated by the discharge interfere greatly with the sampling of the test waveform, which will affect the sampling and identification of the test waveform

If ordinary electronic switches are used to complete the connection and cut-off of the test circuit to generate pulse oscillation voltage, it is difficult for ordinary electronic switches to withstand the high voltage of the reactor pulse oscillation test.

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