A Circuit Structure and the Test Method of High Voltage DC Circuit Breaker

摘要

Introduce a method of using auxiliary oscillator circuit connected the break of the circuit. DC current can be interrupted by the break of AC current circuit breaker according to the principle of the current zero-crossing occurred by superimposed current. The features and the circuit structure of the breaker based on above-mentioned principle as well as the calculation method of key parameters are introduced in detail. This paper at the same time discusses about the forms of the experimental circuit for testing and verifying the capability of interrupting DC current on the circuit. Especially, the scheme of the equivalent test circuit of imitation DC power supply was proposed which based on storage energy with the capacitor and the experimental operational timing diagram, simulation waveforms and the experimental waveforms are given. Ultra-high voltage direct current (UHVDC) transfer switching formed based on same principle used in UHVDC transmission project was recommended.