IEEE Std C62.92.5:2020 pdf download.IEEE Guide for the Application of Neutral Grounding in Electrical Utility Systems- Part V: Transmission Systems and Subtransmission Systems.
The scope of this document is to provide 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 ternis used in this part of the guide can be found in IEEE Std C62.92.l.
1.2 Purpose
The purpose of this document is to provide the user with insight on the basic factors and general considerations in selecting the class and means of neutral grounding for a particular ac transmission or subtransmission system. An apparatus to achieve the desired grounding is suggested. and methods for specifying the grounding devices arc given.
1.3 Word Usage
The word shall indicates mandatory requirements strictly to be followed in order to conform to the standard and from which no deviation is permitted (shall equals is required to)Y
The word should indicates that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others: or that a certain course of action is preferred but not necessarily required (should equals is recommended that).
The word may is used to indicate a course of action permissible within the limits of the standard (may equals is permitted to).
The word can is used for statements of possibility and capability, whether material. physical. or causal (can equals is able to).
2. Normative references
The following referenced documents arc indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
IEEE Std C57.32TM, IEEE Standard for Requirements, Terminology, and Test Procedures for Neutral Grounding Devices.
IEEE Std C62.82.l, IEEE Standard for Insulation Coordination—Definitions, Principles, and Rules. IEEE Std C62.llTh1, IEEE Standard for Metal-Oxide Surge Arresters forAC Power Circuits (>1kV).
IEEE Std C62.22t, IEEE Guide for the Application of Metal-Oxide Surge Arresters for Alternating-Current Systems.
IEEE Std C62.92.1, IEEE Guide for the Application of Neutral (irounding in Electrical Utility Systems— Part I: Introduction.
3. General considerations
AC transmission and subtransmission systems are generally qualified as those with the following common attributes as compared to generating systems, distribution systems, or auxiliary systems:
With some exceptions, transmission and subtransrnission systems take energy from or supply energy to other types of systems (i.e.,from generating systems and to distribution systems) rather than supplying this energy at the ultimate utilization point.
Transmission and subtransmission systems are three-phase systems.IEEE Std C62.92.5 pdf download.