This guide contains general and specific recommendations for grounding current transformers (CTs) and voltage transformers (VTs) secondary circuits and cases of connected equipment. The practices recommended apply to all transformers of this type, including capacitive voltage transformers and linear couplers, irrespective of primary voltage or whether the primary windings are connected to, or are in, power circuits or are connected in the secondary circuits of other transformers as auxiliary current transformers or voltage transformers. Although most diagrams included in this guide show relaying applications, the recommended practices apply equally to metering and other areas where instrument transformers are used. Exceptions to grounding are permissible or sometimes required where advantages obtained by not grounding, in certain instances or in certain types of installations, are considered to outweigh the advantages obtained by grounding. The scope of the guide includes grounding practices presently used and practices that were not previously reported. Specifically, a review of other than North American grounding practices is included.
- Sponsor Committee
- PE/PSRCC - Power System Relaying and Control
Learn More - Status
- Active PAR
- PAR Approval
- 2022-11-10
- Superseding
- C57.13.3-2014
Working Group Details
- Society
- IEEE Power and Energy Society
Learn More - Sponsor Committee
- PE/PSRCC - Power System Relaying and Control
Learn More - Working Group
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WG I46 - PC57.13.3 Guide Inst Trf Sec Cir & Cases - WG I46 - PC57.13.3 Revision of Guide for Grounding of Instrument Transformer Secondary Circuits and Cases
Learn More - IEEE Program Manager
- Malia Zaman
Contact - Working Group Chair
- Bruce Magruder
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