Patent ID: 9310421
Filing Date: 2016-04-12
CPC Classification: G01R

Claim Text:
1. An apparatus for testing a thyristor valve, the apparatus comprising: a current source circuit that provides an electric current when a thyristor valve as a test target is turned on; a voltage source circuit that provides a reverse voltage or a forward voltage when the thyristor valve is turned off; a first auxiliary valve provided between a connection point between the thyristor valve and the voltage source circuit and the current source circuit, and that insulates the current source circuit from the voltage source circuit to protect the current source circuit from a high voltage of the voltage source circuit; and an auxiliary circuit that forcibly turns off the first auxiliary valve when the thyristor valve is turned off, wherein the auxiliary circuit comprises: a first direct current (DC) source circuit section that generates a DC voltage for turning off the first auxiliary valve; an auxiliary switch having one end connected to an anode output terminal of the first DC source circuit section and the other end connected to the current source circuit; and a capacitor having one end connected to the auxiliary switch and the other end connected to a connection point between the current source circuit and the first auxiliary valve.