Instrumentation for Thyristor Control

Since thyristor control produces nonsinusoidal periodic waveforms with high harmonic content, the electrical measurements associated with such controls require some adaptation of the existing techniques which have evolved mainly for the measurement of constant (dc) or sinusoidally varying (ac) electrical quantities. The basic principles and instruments discussed are relevant to voltage, current, real and reactive power, and power factor measurement in situations most likely to be encountered in applications of silicon-controlled rectifiers (thyristors).