Provided are a rectification circuit
thyristor operation
status test method and a test device. The method comprises the following steps: voltages at the two end of a
thyristor are subjected to sampling; the voltages are further subjected to attenuation
processing; analog-to-
digital conversion is carried out on the attenuated voltages; data after the analog-to-
digital conversion in a single period is obtained with a rectification period as one single period; the maximum mean value of forward peak
voltage in a plurality of periods and the minimum mean value of inverse peak voltages are calculated;
statistical analysis of the data bulk of the actual magnitude of
voltage of the
thyristor in a predetermined conduction
voltage interval is carried out; the single period
conduction time of the thyristor is calculated on the basis of the data bulk and the single period; the operation status of the thyristor is determined on the basis of the maximum mean value, the minimum mean value and the single period
conduction time; and then the maximum mean value, the minimum mean value, the single period
conduction time and the operation state of the thyristor are output. According to the invention, live-line on-line tests can be carried out on a rectification
system. Meanwhile, when equipment abnormity is found, fault points can be located in a condition that power
cutting of the equipment is not carried out.