Protective relays such as Transmission Line relays and Transformer Differential relays have current flowing to them that is proportional to the current that is in the primary circuit. In most cases, what is used to transform the current from the primary circuit to a smaller proportional amount that flows to the protective relay?
A) Series Capacitors.
B) Current Transformers.
C) Potential Transformers.
D) Voltage reduction relays.