High frequency grounding analysis of capacitor bank switching
Conference
·
OSTI ID:103777
- Commonwealth Edison, Chicago, IL (United States)
Back to back capacitor bank switching produces high transient currents which circuit breakers and circuit switcher interrupting elements have been designed to withstand. Direct neutral grounding of the capacitor banks to the substation ground grid could be acceptable if the local grounding area around the capacitor bank neutral is a reasonably well-designed mesh to permit more even distribution of transient current. In this study, high magnitude transient currents from four capacitor bank switching did not cause equipment damage due to good distribution of current in the capacitor area ground grid, even though poorly distributed lower magnitude currents did cause damage. Only by the use of a computer program can these transient voltages be predicted when designing the grounding system. The use of pre-insertion inductors proved to be a satisfactory remedy to this problem, but the designer should give serious thought to supplying a grid system with meshes to improve transient current distribution in the grounding system.
- OSTI ID:
- 103777
- Report Number(s):
- CONF-950414--
- Country of Publication:
- United States
- Language:
- English
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