Abstract :
THE BEHAVIOR of Deltamax reactors having rectangular hysteresis loop for sinusoidal applied voltages is similar to a gas tube: current for a given voltage flows only for a portion of the cycle called the “conduction angle,” and is practically negligible outside this range. Though the conduction angle increases with an increase of the amplitude of the applied voltage, the relationship between this angle and the voltage is quite different from that of a gas tube and is controlled by two factors, namely, the critical value of flux density at which the core saturates, and the nature of the series load. This relationship was derived for the two cases of pure resistance load and a load comprising series resistance and inductance, as shown in Fig. 1, thus: 1. The critical voltage at which firing takes place is a characteristic of the reactor, unaffected by load condition. 2. For voltages higher than the critical voltage, the presence of inductance in the load increases the conduction angle, thus increasing the sensitivity of the reactor.
