A short-cut method of estimating telephone-influence factor of power systems with rectifier load

In the planning of rectifier installations it is often desired to study the effect of the rectifier on co-ordination with communication systems. The telephone-influence factor¹ (TIF) is used in such studies as an index to the effect of distortion of the voltage and current-wave shapes on the inductive influence. Both voltage and current TIF are involved, because there are two types of induction: 1. Electric induction which depends upon the power-circuit voltage. 2. Magnetic induction which depends upon the current.