As an important operation test item

valve fault current tests must prove that the proper design of the valve to withstand the maximum current

voltage and temperature stresses arising from short-circuit current.And the characteristics of the test circuit should be high equivalent to the condition of real operation states.As a power source

the short-circuit generator system supplies the fault current and the prospective recovery voltage exactly at the time when the fault current reaches its zero.It is an ideal test circuit for the valve fault current tests with high equivalence.During the test

the synthetic test circuit for the operational type test supplies normal operation condition of the valve

and the short-circuit generator system suddenly makes a short-circuit fault while the temperature of the thyristor junction and operation parameters reach the required values.So the valve conducts fault current and undertakes prospective voltage to check its ability to withstand the stresses arising from the fault.