Long-time voltage tolerance test device and method for direct-current transfer switch lightning arrester

Abstract

The invention discloses a long-time voltage tolerance test device for a direct-current transfer switch lightning arrester. The device comprises a direct-current power supply, a high-voltage switch, acapacitor, a damping resistor, a reactor and a test sample, wherein the direct-current power supply is connected with the high-voltage switch; the output end of the direct-current power supply is connected with the capacitor, the input end of the direct-current power supply is connected to a power frequency power supply, and the capacitor, the high-voltage switch, the damping resistor, the reactorand the test sample are sequentially connected in series to generate low-frequency resonance to form a series loop. According to the device and method, series resonance is generated through a loop consisting of the capacitor, the damping resistor and the reactor, square wave voltage with adjustable amplitude and controllable duration is generated on the test sample, an overvoltage working condition borne by a lightning arrester in the direct current conversion process is restored, the long-duration voltage tolerance characteristic of the lightning arrester is obtained, the fault of the lightning arrester caused by the fact that the voltage tolerance characteristic is not satisfied is avoided, the direct current conversion switch lightning arrester is effectively checked, and the long-timevoltage tolerance test device has the advantages of long voltage duration and adjustable voltage amplitude and duration.

Description

technical field [0001] The invention relates to the technical field of lightning arrester testing, in particular to a device and method for long-time voltage withstand testing of lightning arresters for direct current conversion switches. Background technique [0002] When a single-pole blockage occurs during the bipolar operation of the DC system, the healthy pole forms a single-pole ground loop operation through the ground pole and the ground loop. At this time, thousands of amperes of direct current are injected into the ground pole, which will affect the safe operation of surrounding transformers and oil and gas pipelines. , should be converted to unipolar metal loop operation as soon as possible to reduce the operating time of single pole ground loop. When the fault is eliminated and the power transmission of the outage pole is resumed, the unlocking procedure of the outage pole valve group can only be performed after the unipolar metal is transferred to the earth retur...

AI Technical Summary

Problems solved by technology

The voltage withstand energy requirements of the DC converter arrester are very high. However, due to the lack of long-duration voltage withstand test equipment, various research institutes and arrester manufacturers are unable to carry out corresponding voltage withstand tests for the DC converter arrester, resulting in the operation of the arrester. reliability cannot be guaranteed

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