A new IEEE application guide for shunt reactor switching

The paper gives a brief overview of the content of the new IEEE Application Guide for Shunt Reactor Switching, C37.015. The interruption of shunt rector currents involves a complex interaction between the circuit breaker and the source and reactor circuits resulting in several transient overvoltage phenomena. The derivation of the overvoltage levels for the three cases of directly grounded, ungrounded and reactor grounded shunt reactors is explained. For the overvoltage calculation, the so-called chopping number concept is used. Methods of limiting the overvoltages are also discussed.