the converter valve is one of the core equipments of the DC converter station. Its performance is directly related to the safe and stable running of DC system. Regular tests can verify the health of the converter valve in time. In this paper
based on the theory of protective firing of the valve and the working principle of the protective firing test
the fault handling principle of a thyristor protective firing alarm is expounded. Finally
in combination with some problems encountered during the test
suggestions for maintenance are proposed
which can provide references for the maintenance and test of the valve.