IEEE C37.20.2-2015

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IEEE Standard for Metal-Clad Switchgear (Superseded Redline)

Published By	Publication Date	Number of Pages
IEEE	2015	94

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Description

Revision Standard – Superseded. Metal-clad (MC) medium-voltage switchgear that contains drawout electrically operated circuit breakers is covered. MC switchgear is compartmentalized to isolate components such as instrumentation, main bus, and both incoming and outgoing connections with grounded metal barriers. Rated maximum voltage levels for metal-clad switchgear range from 4.76 kV to 38 kV with main bus continuous current ratings of 1200 A, 2000 A, 3000 A, and 4000 A. MC switchgear also contains associated control, instruments, metering, relaying, protective, and regulating devices, as necessary. Service conditions, ratings, temperature limitations and classification of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and applications are discussed.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C37.20.2™-2015, Front Cover
3	Title page
5	Important Notices and Disclaimers Concerning IEEE Standards Documents
8	Participants
10	Introduction
12	Contents
15	IMPORTANT NOTICE 1. Overview 1.1 Scope 1.2 Purpose
16	2. Normative references
18	3. Definitions
21	4. Service conditions
22	5. Ratings 5.1 General 5.2 Voltage and insulation levels
23	5.3 Rated power frequency 5.4 Rated current
24	5.5 Temperature limitations
26	5.6 Current transformer ratings
27	5.7 Current transformer accuracies 5.8 Voltage transformers 5.9 Other devices
28	6. Tests 6.1 General 6.2 Design tests
46	6.3 Production tests
47	6.4 Conformance tests 6.5 Field dielectric tests
48	6.6 Optional tests 7. Construction 7.1 Buses and primary connections
49	7.2 Grounding and bonding 7.3 Control and secondary circuits and devices
54	7.4 Miscellaneous
55	7.5 Materials, finishes, and color
56	7.6 Precautionary labels 7.7 Metallic barriers 7.8 Shutters 7.9 Insulating materials for covering buses and connections
57	7.10 Interlocks 7.11 Interchangeability of removable switching and interrupting devices
58	7.12 Primary fuses and transformers 7.13 Secondary disconnect devices 7.14 Control wiring 7.15 Handling device
59	7.16 Test cabinet 7.17 Indoor MC switchgear, access, and ventilation 7.18 Outdoor MC switchgear, access, and ventilation 7.19 Circuit breaker open/close position indication 7.20 Enclosure categories
60	7.21 Ground and test devices 7.22 Load interrupter switches 7.23 Voltage dividers 8. Application guide for MC switchgear 8.1 Unusual service conditions
64	8.2 System characteristics—voltage and frequency 8.3 Overvoltage considerations—insulation levels 8.4 Continuous current rating and overload capability
72	8.5 Short-circuit considerations 8.6 Nuclear power plant application 8.7 Associated devices often used in MC switchgear
74	8.8 Protection and isolation of switchgear connected to other circuit protective equipment 9. Guide for handling, storage, and installation 9.1 General 9.2 Handling
76	9.3 Preoperation check
77	9.4 Removable elements 9.5 Interlocks 9.6 Energizing
78	Annex A (informative) Bibliography
80	Annex B (normative) Guide for enclosure categories and related requirements B.1 Introduction B.2 Enclosure categories
81	B.3 Enclosure requirements
87	Annex C (informative) Partial discharge testing C.1 General C.2 Application
88	C.3 Test circuits and measuring instruments C.4 Test procedure
89	C.5 Maximum permissible partial discharge quantity
90	Annex D (normative) Voltage dividers D.1 Introduction D.2 Glossary D.3 Construction
91	D.4 Performance
94	Back Cover Back Cover