When a high voltage circuit breaker interrupts a fault or load current, the voltage across its terminals goes almost instantaneously from a low arc voltage to a much higher recovery voltage. This latter voltage is known as the transient recovery voltage or TRV for short.
The characteristics of TRVs are dependent on the type of current being interrupted, the system grounding arrangement and the reaction of the associated circuit to the change of state. The reaction involves power frequency components with superimposed oscillations dependent on circuit damping and travelling wave effects.
This hands-on course (bring a calculator) gives an overview of the origins of TRVs for the following cases:
Terminal, short-line and out-of-phase faults
Capacitive current switching: shunt capacitor banks, cables and lines
Inductive current switching: shunt reactors and unloaded transformers
The derivation of the TRV values found in the IEC and IEEE standards, now harmonized, will be explained.
Note: Please bring a calculator to the session.
Dr. David F. Peelo, P.Eng. – DF Peelo & Associates Ltd.
Dr. David Peelo, P.Eng., is a consultant at ZE Power Engineering Inc. He graduated from University College Dublin in 1965 and worked first for the ASEA Power Transmission Products Division in Sweden. He joined BC Hydro in 1973, where he rose to the position of specialist engineer for switchgear and switching. He became an independent consultant in 2001. In 2004 the Eindhoven University of Technology awarded him a PhD for original research on current interruption using air-break disconnect switches. He has published more than 50 papers and is actively involved with IEEE, CIGRE and IEC. He is convener of IEC Maintenance Team 32 Inductive Load Switching and IEC Maintenance Team 42 Capacitive Current Interrupting Capability of Disconnectors.