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

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/61.85876· OSTI ID:5853441

Kappenman, J G; Norr, S R; Sweezy, G A; Carlson, D L ^[1]; Albertson, V D ^[2]; Harder, J E ^[3]; Damsky, B L ^[4]

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1. Minnesota Power and Light Co., Duluth, MN (United States)
2. Minnesota Univ., Minneapolis, MN (United States)
3. ABB, Bloomington, IN (US)
4. 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), Journal Name: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (United States) Vol. 6:3; ISSN 0885-8977; ISSN ITPDE
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240100* -- Power Systems-- (1990-)
240400 -- Power Transmission & Distribution-- Health & Safety-- (1990-)
CAPACITORS
CIRCUIT BREAKERS
DISTURBANCES
ELECTRICAL EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
OVERVOLTAGE
PLANNING
POWER DISTRIBUTION SYSTEMS
SAFETY
TRANSFORMERS