Title :
The testing of SF6 generator circuit-breakers
Author :
Smeets, R.P.P. ; van der Linden, W.A.
Author_Institution :
KEMA High-Power & High-Voltage Labs., Arnhem, Netherlands
fDate :
10/1/1998 12:00:00 AM
Abstract :
Generator circuit-breakers face much higher current and voltage stress than distribution switchgear. This has led to a special standard (ANSI C37.013). Strictly in accordance with this standard´s requirements, test circuits and parameters for a 100 kA and 120 kA (25.3 kV) SF6 generator circuit-breaker have been defined. The circuit-breaker is equipped with capacitors at both sides of the extinction chambers. The effect of these is to reduce the TRV severity and this is quantified for the relevant switching duties. Adequate test-circuits are described. Also, the optional verification of interruption of generator-fed faults with very large DC components has been demonstrated. Herein, delayed current zero can extend arcing time. The importance of arc voltage in reducing the longer arcing time is illustrated in a calculated example
Keywords :
SF6 insulation; circuit-breaking arcs; electric generators; electrical faults; gas blast circuit breakers; machine protection; standards; switchgear testing; 100 kA; 120 kA; 25.3 kV; ANSI C37.013; DC components; SF6; SF6 generator circuit breaker testing; TRV severity; arc voltage; arcing time; capacitors; current stress; delayed current zero; extinction chambers; generator-fed fault interruption; switching duties; test circuits; test parameters; voltage stress; Capacitance; Certification; Circuit faults; Circuit testing; Fault currents; Frequency; Power generation; Short circuit currents; System testing; Voltage;
Journal_Title :
Power Delivery, IEEE Transactions on
