Switching surge voltages in high-voltage stations

SWITCHING SURGES, lightning surges, and 60-cycle voltages are, in general, the three types of voltages involved in the design and protection of insulation of stations and station equipment. Under switching surges may be classified various groups dependent upon the manner of initiation, the circuit parameters involved, and the circuit configuration. Of the numerous kinds of transient abnormal voltages caused by switching, the type receiving primary consideration in line and station insulation design has been that resulting from circuit breaker performance in the interruption of charging kva such as occurs in line or cable dropping or in switching a capacitor bank.