Title :
A practical approach in substation capacitor bank applications to calculating, limiting, and reducing the effects of transient currents
Author_Institution :
Resource Manage. Int. Inc., West Palm Beach, FL, USA
Abstract :
When two or more capacitor banks are in parallel on a common bus, the back-to-back switching of a bank against one or more already energized banks can produce high peak transient in-rush current values. Typically, these currents can exceed the available fault current levels previously present at the bus. The presence of inductance and capacitance together makes the transients oscillatory. Because of close circuit coupling, the transient frequency is generally several kilohertz or higher and usually decays to zero in a fraction of a 60-Hz cycle. The relatively high level and short duration of these currents can damage substation and control equipment necessitating that appropriate precautions be taken during the design process. This paper explores the methods for estimating capacitor bank transient currents, based on ANSI/IEEE C37.012-1979, for various sizes, voltages, and configurations of real world capacitor bank installations. Also discussed are the various accepted and applied methods for limiting substation equipment susceptibility to transients, as well as reducing the magnitude of the transients themselves
Keywords :
capacitance; capacitor storage; inductance; power system transients; substations; ANSI/IEEE C37.012-1979; back-to-back switching; capacitance; close circuit coupling; high peak transient in-rush current; inductance; oscillatory transients; substation capacitor bank applications; substation equipment; transient currents calculation; transient currents effects reduction; transient currents limiting; transient susceptibility limiting; Capacitance; Capacitors; Control equipment; Coupling circuits; Fault currents; Frequency; Inductance; Process design; Substations; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on