IEEE C37.121-2020 IEEE Guide for Switchgear¿¿¿Unit Substation--Requirements

standard by IEEE, 03/09/2021

Full Description

Scope

This guide covers three-phase unit substations for step-down operation in the range of 112.5 kVA or greater at primary voltages of 601 V through 52 kV.This guide does not cover the following installations:a) Substations in which the transformer section is described and defined as a??network,a?? a??subway,a??a??vault,a?? or a??undergrounda?? in IEEE Std C57.12.24¿¿¿ [B13] and IEEE Std C57.12.40¿¿¿ [B15]2b) Substations in which the transformer section is described and defined as a??pad-mounteda??c) Rectifier-type substationsd) Mobile unit substationse) Installations in ships, watercraft, railway rolling stock, aircraft, or automotive vehiclesf) Installations for minesg) Installations of railways for generation, transformation, transmission, or distribution of power usedexclusively for operation of rolling stock, or for installations used exclusively for signaling andrailway communication purposesh) Installations of communication equipment that is under the exclusive control of communicationutilities, located outdoors or in building spaces used exclusively for such installationsi) Installations under the exclusive control of electric utilities for the purpose of communication, ormetering; or for the generation, control, transformation, transmission, and distribution of electricenergy located in buildings used exclusively by utilities for such purposes or located outdoors onproperty owned or leased by the utility or on public highways, streets, roads, etc.; or outdoors byestablished rights on private property

Purpose

The guide is intended for use as the basis for the coordination of equipment in unit substations by assisting in the selection of components. A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition sections.It is intended that the incoming, outgoing, transformer, and transition sections included in a unit substation meet the basic requirements of applicable industry standards for those sections. In addition, this guide provides suggested requirements when used as part of a unit substation.

Abstract

Revision Standard - Active.The basis for the coordination of equipment in unit substations by assisting in the selection of components is intended as the use of this guide. A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition sections. It is intended that the incoming, outgoing, transformer, and transition sections included in a unit substation meet the basic requirements of applicable industry standards for those sections. This guide covers three-phase unit substations for step-down operation in the range of 112.5 kVA or greater at primary voltages of 601 V through 52 kV.

Product Details

Published: 03/09/2021 ISBN(s): 9781504477734, 9781504477567, 9781504474771, 9781504477543, 9781504470933 Number of Pages: 40 File Size: 1 file , 1.8 MB Redline File Size: 2 files , 9.6 MB Product Code(s): STDRL24426, STD24426, STDPD24426, STDPDRL24426, STDPL24642