Mitigation of geomagnetically induced and dc stray currents. Final report
This report primarily describes several approaches to mitigate the effects of Geomagnetic Induced Currents (GIC) and dc stray currents in power systems; the engineering and design considerations for a neutral capacitor blocking device; and development and testing of a prototype device of this type. Modeling of the power system for computation of GIC are described. Results from three field tests, for documenting the effects of GIC by injecting direct current (dc) into the neutrals of the transformers, are presented. Several mitigation concepts are discussed and evaluated. The concept of blocking GIC and dc stray currents by a neutral capacitor is addressed in detail. The development and testing of the prototype blocking device is described. The technical requirements and specifications for the application of these devices are also included. A perspective on the economics of GIC mitigation is included. The effect of GIC and dc stray currents on HVdc converter operation, supported by computer simulations, is also discussed.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
- Resource Type:
- Technical Report
- Research Org:
- Minnesota Power and Light Co., Duluth (USA)
- Country of Publication:
- United States
- 24 POWER TRANSMISSION AND DISTRIBUTION; POWER SYSTEMS; ELECTRICAL TRANSIENTS; EQUIPMENT PROTECTION DEVICES; CAPACITORS; FIELD TESTS; HVDC SYSTEMS; POWER TRANSMISSION LINES; TRANSFORMERS; DC SYSTEMS; ELECTRICAL EQUIPMENT; ENERGY SYSTEMS; EQUIPMENT; TESTING; TRANSIENTS; VOLTAGE DROP 200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
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