Investigation of geomagnetically induced currents in the proposed Winnipeg-Duluth-Twin Cities 500-kV transmission line. Final report
This study investigated the effects of geomagnetically-induced currents (GIC) on a new 749 km (466 mile) 500 kV ac transmission line from the vicinities of Winnipeg, Manitoba to Duluth, Minnesota to Minneapolis-St. Paul, Minnesota. The period of performance was from July 15, 1977 through June 15, 1980, and involved a study of the effects on the operation of the 500 kV line, equipment connected directly to the line, and effects on the power systems connected to the line. The power systems that are interconnected by the 500 kV line are Manitoba Hydro, Minnesota Power and Light Company, and Northern States Power Company. The study covers the instrumentation to measure and record geomagnetic field fluctuations, earth-surface potential, and GIC; the analytical determination of GIC throughout the system; the determination of increased transformer reactive power requirements under conditions of half-cycle saturation; interconnected power system load-flow studies in the presence of GIC; switching transients on the 500 kV line and harmonic studies of the 500 kV autotransformers in the presence of GIC; the effects of GIC on current transformers and relays; and, effects of harmonics due to GIC on high voltage dc converter station operation.
- Research Organization:
- Minnesota Power and Light Co., Duluth (USA); Minnesota Univ., Minneapolis (USA). Dept. of Electrical Engineering
- OSTI ID:
- 6072373
- Report Number(s):
- EPRI-EL-1949; ON: DE81904233
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EHV AC SYSTEMS
POWER TRANSMISSION LINES
ELECTRIC CURRENTS
ELECTRICAL TRANSIENTS
FLUCTUATIONS
GEOMAGNETIC FIELD
HVDC SYSTEMS
INTERCONNECTED POWER SYSTEMS
LOAD ANALYSIS
MAGNETIC STORMS
MAGNETOMETERS
TRANSFORMERS
AC SYSTEMS
CURRENTS
DC SYSTEMS
ELECTRICAL EQUIPMENT
ENERGY SYSTEMS
EQUIPMENT
MAGNETIC FIELDS
MEASURING INSTRUMENTS
POWER SYSTEMS
TRANSIENTS
VARIATIONS
VOLTAGE DROP
200301* - Power Transmission & Distribution- AC Systems
EHV & UHV- (-1989)