NDLI: Performance testing low voltage ground fault protection

Content Provider	IEEE Xplore Digital Library
Author	Coyle, T.
Copyright Year	2001
Description	Author affiliation: Sebesta Blomberg & Associates, Roseville, MN, USA (Coyle, T.)
Abstract	The National Electrical Code requires ground fault protection (GPF) of equipment by devices intended to detect and interrupt low-current arcing phase-to-ground faults on many solidly-grounded low voltage systems having current ratings of 1000 A or greater. This code also dictates field performance testing of ground fault protection, but does not prescribe specific techniques to be used. This paper reviews the types of ground fault protection equipment and systems in use today, ranging from simple bolted-pressure switch and relay combinations to complex multiple-source systems and zone-selective-interlocked systems. Conditions that can cause misoperation of ground fault protection are reviewed, including a summary of problems identified during field testing of actual projects. Available testing techniques are reviewed and primary current injection is recommended as the most reliable means of field verification for most ground fault protection systems. Required test equipment setup for each system configuration is described, and cautions to be observed during this type of testing are presented. This paper benefits engineers and technicians responsible for acceptance testing of electrical equipment.
Sponsorship	IEEE Ind. Appl. Soc. Ind. & Commerical Power Syst. Dev.
Starting Page	147
Ending Page	156
File Size	788311
Page Count	10
File Format	PDF
ISBN	0780370554
DOI	10.1109/ICPS.2001.966525
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-05-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Low voltage Protection Switches System testing Electrical fault detection Phase detection Protective relaying Fault diagnosis Test equipment Reliability engineering
Content Type	Text
Resource Type	Article

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