Breaking test device and test method for high-voltage direct current breaker

Abstract

The invention relates to a breaking test device and test method for a high-voltage direct current breaker. A reactor L of the device is connected in series with the high-voltage direct current breaker and then separately connected in parallel with a high-voltage circuit and a low-voltage circuit; a bypass switch is connected in parallel to two ends of the high-voltage direct current breaker; and a protection thyristor is connected in parallel to two ends of a full-bridge module in a mechanical switch-full-bridge module branch. In the test method, rated current from a low-voltage high-current source is injected to the breaker via a thyristor isolating valve; a capacitor is charged by a high-voltage low-current source, initial test voltage is established, the high-voltage circuit is discontinuously triggered by spark, the test current is adjusted by the reactor and then injected into the breaker, the thyristor isolating valve is switched off, breaking is accomplished when the expected breaking current or the maximum breaking time arrives, and the breaker tolerates transient recovery overvoltage and residual voltage of the capacitor in the high-voltage circuit. The device and the method can reproduce current, voltage and thermal stress of the high-voltage direct current breaker in practical operation, are high in test equivalence, and have the capability of reliably detecting the breaking performance of the breaker.

Description

technical field [0001] The invention relates to a test device and a test method for a DC circuit breaker, in particular to a breaking test device and a test method for a high-voltage DC circuit breaker. Background technique [0002] With the application of multi-terminal flexible DC and DC grid technology based on voltage source converter (VSC), fast high-voltage DC circuit breaker has become one of the key equipment to ensure the stable, safe and reliable operation of the system, and its operation reliability directly determines all To configure the safety and economy of the DC system, it is necessary to conduct a comprehensive test to detect the performance of the high-voltage DC circuit breaker, and the breaking capacity of the circuit breaker is one of the most important properties. High-voltage DC circuit breakers are still at the cutting-edge technology in the field of power electronics. At present, only two multinational companies, ABB and ALSTOM, have completed the d...

AI Technical Summary

Problems solved by technology

High-voltage DC circuit breakers are still at the cutting-edge technology in the field of power electronics. At present, only two multinational companies, ABB and ALSTOM, have completed the development of high-voltage DC circuit breaker prototypes. The test methods are highly confidential and there are few literature reports.

However, the mature high-voltage DC conversion switch test adopts a single power supply test method, which can complete large current breaking, but it cannot effectively equivalent to the thermal stress during the breaking process of the circuit breaker and the recovery overvoltage after breaking, and the versatility is poor.

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