Current Interruption Transients Calculation

The intent of this second edition is to improve on the first edition content by way of changes to and rearranging the original text as well as the addition of new material. The changes include: a common first-pole-to-clear calculation for both effectively and non-effectively earthed systems; series reactor application is covered in much more depth; short-line fault transient recovery voltage (TRV) derivation and capacitive current recovery voltage calcu- lation have been expanded to provide better understanding; and the derivation and use of a generic TRV equation for shunt reactor switching. There are two major additions: the calculation of generator circuit breaker TRVs in Appendix G replacing the former small capacitive current switching content which has now moved to Chapter 7; and, as requested by many, key calculation examples on the use of Excel for plotting TRV equations in Appendix I. I am grateful to all those who provided comments, criticism, ideas, and suggestions, most of which have been adopted. Once again, I am greatly indebted to Sandra Giasson for her patient and diligent word processing of the text.