Polarity reversing test device and test method thereof for high-voltage DC filter capacitor

Abstract

The invention discloses a polarity reversing test device and a test method thereof for a DC filter capacitor. The test device consists of a test power supply system, a DC reversing test system, a measurement and control system and a grounding protection system. The two ends of a transformer inside the test power supply system are connected through a switching switch and a rectifying silicon stackto provide the positive and negative polarity voltage for a capacitor. The reversing test system is connected with the test power supply, wherein the polarity reversing of different times and voltagesof the capacitor can be realized by utilizing the energy storage of the capacitor and through adjusting the inductance and the resistance. The measurement and control system controls a switch of thedevice to realize the cyclic reversal of positive and negative polarities, and collects data such as the voltage and current data of the capacitor. The grounding protection system is used for discharging residual charges of the loop, and protecting the safety of both the system and human bodies. According to the test device, the characteristic of the self energy storage of the DC filter capacitoris utilized, so that the polarity reversing of the capacitor under the high-voltage and high-current condition can be realized by adopting the large-current rectifying silicon stack. The time of the reversing test can be smaller than 10 ms.

Description

technical field [0001] The invention belongs to the technical field of electrical testing of a DC filter capacitor for high-voltage direct current transmission, and in particular relates to a polarity reversal test device and a test method for a high-voltage DC filter capacitor. Background technique [0002] High-voltage direct current transmission has the characteristics of strong power transmission capacity and high power transmission efficiency, and can realize safe, reliable, economical and reasonable large-capacity, long-distance power transmission. At present, it is widely used in my country's west-to-east power transmission system to optimize resource allocation and improve energy efficiency in a wider range. High-voltage DC filter capacitor is an important part of the converter station of the DC transmission system, so the research work on the electrical test technology and test method of high-voltage DC filter capacitor is of great significance. [0003] The test a...

AI Technical Summary

Problems solved by technology

The test commutation time is long, up to 1min or even 2min, and the commutation process cannot be achieved less than 10ms; the test consumes more energy and the reverse voltage is lower; the actual working conditions cannot be simulated well, which reduces the effect of test verification

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