GIC mitigation: A neutral blocking/bypass device to prevent the flow of GIC in power systems

J. G. Kappenman, Scott R Norr, G. A. Sweezy, D. L. Carlson, V. D. Albertson, J. E. Huarder, B. L. Damsky

Research output: Contribution to journalArticle

64 Scopus citations

Abstract

- The design for a Neutral Blocking/Bypass Device which can be installed in power transformer neutral ground connections to block the flow of GIC, is described The device consists of standard distribution capacitors which provide the GIC blocking function The capacitors are rapidly bypassed by a combination of a sparkgap and circuit breaker to solidly ground the neutral during power system disturbances. The sparkgap provides the fast operating response speed while the circuit breaker provides a secure metallic bypass of the capacitor. Simulations indicate that the bypass device operation will occur rapidly (on the order of 1 msec or less) and will both prevent ferroresonant overvoltages and preserve proper relay and protective device operation.

Original languageEnglish (US)
Pages (from-to)1271-1281
Number of pages11
JournalIEEE Transactions on Power Delivery
Volume6
Issue number3
DOIs
StatePublished - Jul 1991

Keywords

  • Blocking Capacitors
  • Bypass Switch
  • Geomagnetically Induced Currents (GIC)
  • Neutral Blockinq/Bypass Device
  • Neutral Grounding
  • Sparkgaps

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    Kappenman, J. G., Norr, S. R., Sweezy, G. A., Carlson, D. L., Albertson, V. D., Huarder, J. E., & Damsky, B. L. (1991). GIC mitigation: A neutral blocking/bypass device to prevent the flow of GIC in power systems. IEEE Transactions on Power Delivery, 6(3), 1271-1281. https://doi.org/10.1109/61.85876