GIC mitigation; A neutral blocking/bypass device to prevent the flow of GIC in power systems
- Minnesota Power and Light Co., Duluth, MN (United States)
- Minnesota Univ., Minneapolis, MN (United States)
- ABB, Bloomington, IN (US)
- Electric Power Research Inst., Palo Alto, CA (United States)
In this paper 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.
- OSTI ID:
- 5853441
- Journal Information:
- IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States), Vol. 6:3; ISSN 0885-8977
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
POWER DISTRIBUTION SYSTEMS
CIRCUIT BREAKERS
DISTURBANCES
SAFETY
CAPACITORS
EQUIPMENT PROTECTION DEVICES
OVERVOLTAGE
PLANNING
TRANSFORMERS
ELECTRICAL EQUIPMENT
EQUIPMENT
240100* - Power Systems- (1990-)
240400 - Power Transmission & Distribution- Health & Safety- (1990-)