Standard Details
The neutral grounding of single- and three-phase ac electric-utility primary distribution systems with nominal voltages in the range of 2.4 kV – 34.5 kV is addressed. Classes of distribution-systems grounding are defined. Basic considerations in distribution-system grounding concerning economics, control of temporary overvoltages, control of ground-fault currents, and
ground relaying are addressed. Also considered is the use of grounding transformers, grounding of high-voltage neutral of wye-delta distribution transformers, and interconnection of primary and secondary neutrals of distribution transformers.
| Sponsor Committee | |
| Status |
Active
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| Board Approval |
2014-12-10
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| History |
Published Date:2015-01-19
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Additional Resources Details
| Pars |
Working Group Details
| Working Group |
HV3.5.7 - 3.5.7 App Guide for Neutral Grounding in Elec Utility Systems WG
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| Working Group Chair |
Steven Whisenant
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| Sponsor Committee | |
| Society | |
| IEEE Program Manager | |
| Existing Standards |
Basic factors and general considerations in selecting the class and means of neutral grounding for electrical generating plant auxiliary power systems are given in this guide. Apparatus to be used to achieve the desired grounding are suggested, and methods to specify the grounding devices are given. Sensitivity and selectivity of equipment ground-fault protection as affected by selection of the neutral grounding device are discussed, with examples.
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The basic factors and general considerations in selecting the class and means of neutral grounding for synchronous generator systems connected to electrical utility systems are provided in this guide. It also provides the suggested methods and apparatus to be used to achieve the desired grounding. These guidelines apply to both large and small generators found in electrical utility systems. Definitions of grounding terms used in this the guide can be found in IEEE Std C62.92.1(TM)-2000.
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The application of neutral grounding to three-phase electrical utility systems is described in this guide. It is Part 1 of the IEEE C62.92 series of guides for neutral grounding. This guide presents basic considerations of the selection of neutral grounding parameters that will provide for the control of overvoltage and ground-fault current on all parts of three-phase electrical utility systems rated greater than 1000 V.
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Applications to three-phase electrical utility systems are described in this Part VI of the IEEE C62.92? series. Definitions and considerations related to system grounding where the dominant sources of system energization are current-regulated or power-regulated power conversion devices are provided.
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Basic factors and general considerations in selecting the class and means of neutral grounding for a particular ac transmission or subtransmission system are covered in this guide. An apparatus to be used to achieve the desired grounding is suggested, and methods for specifying the grounding devices are given. Transformer tertiary systems, equipment-neutral grounding, and the effects of series compensation on grounding are discussed.
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