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Practical Low Voltage Equipment Ground Fault Protection for Solidly Grounded Systems with Wye-Connected Source Transformers

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1 Author(s)
Smith, R.L., Jr. ; General Electric Company, 8 Automation Lane, Albany, NY 12205.

A low voltage equipment ground fault protection system for solidly grounded radial systems is described. The protection provides primary protection for source substation buses. It is capable of providing selective operation with downstream ground fault trip devices or phase-overcurrent devices set to detect ground faults. It also provides source transformer protection for phase-to-ground through faults to supplement transformer primary phase-to-phase and three-phase through-fault overcurrent protection.

Published in:

Industry Applications, IEEE Transactions on  (Volume:IA-18 ,  Issue: 2 )