System and method for testing withstand voltage between DC voltage support capacitor terminals

Abstract

The invention discloses a system and method for testing a withstand voltage between DC voltage support capacitor terminals, and the system comprises a DC charging power device and a testing and discharging circuit. The DC charging power device is used for converting AC power into DC power, and outputting the DC power to the testing and discharging circuit for connection. The testing and discharging circuit comprises a testing unit and a discharging unit, and the testing unit comprises one or more parallel testing modules, wherein each testing module comprises a DC fuse and a to-be-tested capacitor, which are connected in series. The discharging unit is used for discharging a capacitor which has completed the withstand voltage testing, and comprises a main discharging module and a fault discharging module. The system employs a modular power design, provides different test voltages for different capacitors, gives full consideration to the test safety and discharge effectiveness, is simple in test method, and is high in reliability of a testing result.

Description

technical field [0001] The invention relates to the field of flexible direct current transmission engineering, in particular to a withstand voltage test system and a test method between terminals of a direct current voltage support capacitor. Background technique [0002] The DC voltage support capacitor is one of the main components of the converter valve in the flexible DC transmission system. It mainly plays the role of filtering, energy storage and protection, so it is required to have extremely high DC voltage tolerance. As one of the withstand voltage test items in the type and routine tests of capacitors, the withstand voltage test between terminals can intuitively and effectively evaluate the DC withstand voltage level of capacitors. [0003] At present, there are few rationally designed withstand voltage test systems between capacitor terminals. Most test systems use a power supply with fixed voltage output to provide working voltage for the test circuit, but cannot...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few rationally designed withstand voltage test systems between capacitor terminals. Most test systems use a power supply with fixed voltage output to provide working voltage for the test circuit, but cannot provide a suitable test voltage for specific capacitor types; some test methods are difficult for personnel. The safety of the battery is also insufficiently considered. During the test, high voltage is accumulated at both ends of the capacitor, and safety accidents are prone to occur when the insulation work is not in place; in the prior art, there is also the problem of low discharge efficiency of the tested capacitor

Images