High power circuit breaker tests using the balanced synthetic circuit

A new arrangement for synthetic testing of switchgear has been developed and verified at high power levels. The new procedure allows the transient recovery conditions to be selected independently of the injection frequency and will therefore make it possible to carry out the full range of tests covered in the recently published IEC and ANSI standards. Circuit configurations are given to meet specific test conditions, and a consideration has been given to questions of breaker interaction. A method of assessing circuit performance in the face of strong interaction is proposed.