The theory and performance of phase advancers

The paper divides advancers into ¿expedor¿ * advancers in which the voltage is proportional to the secondary current, and ¿susceptor¿ advancers in which itis proportional to the secondary voltage. It first considers the effect of these when connected to an ideal motor having a circle diagram of infinite radius and sets out simple relations between the angle of the advancer and the kVA required to do what is desired The necessity for having an angle of lag instead of an angle of lead when running above synchronism is explained. The complete theory of the expedor advancer is worked out from the equivalent circuit, and test results are compared with what might be expected from the theory. A comparison of advancers of different phase angles under different conditions is made to determine which is the best for a given purpose. The equivalent circuit of the susceptor advancer is given, and from it the complete theory is worked out.