Residual voltage test circuit of controllable metal oxide arrester and method thereof

Abstract

The invention discloses a residual voltage test circuit of a controllable metal oxide arrester and a method thereof. The test circuit comprises an impulse current generation device, an impulse modulation capacitor, a voltage divider, a Rogowski coil and a wave form recorder; wherein the impulse current generation device generates operation impulse current and / or lightning impulse current, and is provided with a high voltage output end and a low voltage output end; the impulse modulation capacitor is connected in parallel with a controllable arrester sample between the high voltage output end and the low voltage output end; one end of the voltage divider is connected with the high voltage output end of the impulse current generation device, while the other end is earthed; the Rogowski coilis directly sleeved on a conductor on a branch circuit of the controllable arrester sample; the wave form recorder is connected with the voltage divider and the output end of the Rogowski coil respectively, and is used for recording voltage and current wave form of the controllable arrester sample. The residual voltage test circuit for the controllable arrester and the method thereof prolong wavehead time of the residual voltage on the controllable arrester sample by using the impulse modulation capacitor without changing parameters of the test circuit or the wave form of the lightning impulse current, so that tests have better system equivalence.

Description

technical field [0001] The invention relates to a controllable metal oxide arrester test technology, in particular to a controllable metal oxide arrester residual voltage test circuit and method. Background technique [0002] The arrester residual voltage test is an important part of the arrester type test. The purpose of the test is to obtain the maximum residual voltage of a given design under various specified currents and waveforms. There are specific test standards in GB 11032-2000 and IEC 60099-4:1991 for the operation impact and lightning impulse residual voltage tests of conventional arresters. [0003] For the operation impulse residual voltage test, in the typical test circuit of the conventional surge arrester operation impulse residual voltage test, the apparent wave front time of the operation impulse current waveform generated by the operation impulse current generating device is greater than 30μs but less than 100μs, and the apparent wave tail The half-peak t...

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Problems solved by technology

[0005] However, the above-mentioned test standards for operating impulse residual voltage and lightning impulse residual voltage for conventional arresters are not fully applicable to controllable metal oxide arresters.

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