scope:

Foreword

This guide is a part of a series on neutral grounding in electrical utility systems. When the series of documents are approved and published, they will replace IEEE Std 143-1954, IEEE Guide for Ground-Fault Neutralizers, Grounding of Synchronous Generator Systems, and Neutral Grounding of Transmission Systems. In the new series of documents, individual considerations and practices have been given to the grounding of synchronous generator systems, generator-station auxiliary systems, and distribution systems.

IEEE Std 143-1954 is a revision of AIEE No. 954, October 1954, which was a compilation of the following three AIEE Transaction papers:

- AIEE Committee Guide Report, "Application of Ground-Fault Neutralizers," AIEE Transactions (Power Apparatus and Systems), vol. 72, pt. III, pp. 183-190, April 1953.

- AIEE Committee Report, "Application Guide for the Grounding of Synchronous Generator Systems," AIEE Transactions (Power Apparatus and Systems), vol. 72, pt. III, pp. 517-530, June 1953.

- AIEE Committee Report, "Application Guide on Methods of Neutral Grounding of Transmission Systems," AIEE Transactions (Power Apparatus and Systems), vol. 72, pt. III, pp. 663-668, June 1953.

The contents of Parts I-V of the revision of IEEE Std 143-1954 are based on the foregoing documents but are amplified and updated with new material from the IEEE tutorial course "Surge Protection in Power Systems" (79H0144-6-PWR) and other sources.

In Parts I through V of this series, emphasis is on power system grounding practices as contrasted with the grounding, for example, of industrial systems, which is covered in other guides and standards. These guides and standards should be referenced, when appropriate, to gain a full picture of other grounding practices.

It is impossible to give recognition to all those who have contributed to the technology and practices of grounding of power systems, since work involving the preparation of this guide has been in progress for over 30 years. However, the assistance of members, past and present, of the Neutral Grounding Devices Subcommittee of the Surge-Protective Devices Committee, and other similar groups with comparable purposes, should be acknowledged.

Disclaimer

This guide is specifically written for electrical utility systems and does not recognize the neutral grounding requirements for dispersed storage and generation. These requirements must recognize the restrictions imposed by the specific network to which the dispersed storage or generation is connected. Neutral grounding of dispersed storage and generation needs to be coordinated with the electrical utility system.

Scope

The purpose of this document is to give the basic factors and general considerations in selecting the class and means of neutral grounding for a particular ac transmission or subtransmission system, and the suggested method and apparatus to be used to achieve the desired grounding.

Definitions of grounding terms used in this part of the guide may be found in IEEE Std C62.92-1987 [1].