IEEE C37.121 2013

$35.21

IEEE Guide for Switchgear – Unit Substation – Requirements

Published By	Publication Date	Number of Pages
IEEE	2013	42

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Description

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 stepdown operation in the range of 112.5 kVA or greater at primary voltages of 601 V through 38 kV.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C37.121-2012 Front Cover
3	Title page
6	Notice to users Laws and regulations Copyrights Updating of IEEE documents Errata Patents
8	Introduction
11	Contents
13	Important Notice 1. Overview 1.1 Scope
14	1.2 Purpose 2. Normative references
16	3. Definitions
17	4. Service conditions 4.1 General 4.2 Usual service conditions
18	4.3 Unusual service conditions 5. Transformer section 5.1 Primary unit substation transformers
19	5.2 Secondary unit substation transformers 6. Incoming section 6.1 High-voltage (or primary) bushings on the transformer cover
20	6.2 Primary terminal chamber on the transformer 6.3 Metal-enclosed bus 6.4 Metal-clad or metal-enclosed switchgear
21	6.5 Metal-enclosed interrupter switchgear
22	6.6 Cutout, fuse, or fuse link
23	7. Outgoing section 7.1 Metal-clad switchgear 7.2 Metal-enclosed interrupter switchgear 7.3 Metal-enclosed bus 7.4 Metal-enclosed, low-voltage, power circuit breaker switchgear 7.5 Molded-case, circuit-breaker, dead-front switchboards
24	7.6 Motor control centers 8. Ratings 8.1 Rated power frequency 8.2 Rated kVA 8.3 Rated high voltage (or primary voltage) and rated low voltage (or secondary voltage) 8.4 Rated continuous current 8.5 Rated short-time withstand current
25	8.6 Rated momentary withstand current 8.7 Rated power frequency withstand voltages 8.8 Rated lightning impulse withstand voltage (BIL) 9. Construction 9.1 Phase and polarity arrangements
26	9.2 Phase sequence 9.3 Metal barriers 9.4 Interlocks 9.5 Grounding 9.6 Nameplates
27	9.7 Drawings – Diagrams – Instructions 9.8 Coordination
28	10. Typical arrangements 10.1 Primary unit substations
30	10.2 Secondary unit substations
34	11. Guide for selection, application, installation, and maintenance of unit substations 11.1 Application considerations 11.2 Unusual service conditions 11.3 System conditions
35	11.4 Location—transformer selection 11.5 Load requirements
36	11.6 Miscellaneous design considerations
38	11.7 Installation, field-testing, operation, and maintenance
41	Annex A (informative)Bibliography