IEEE C37.20.2-1999

$76.92

IEEE Standard for Metal-Clad Switchgear

Published By	Publication Date	Number of Pages
IEEE	1999	72

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Description

Revision Standard – Superseded. Metal-enclosed medium voltage switchgear (ME), which can contain either drawout electrically operated circuit breakers or stationary electrically operated circuit breakers in individual three-pole grounded metal compartments, is covered. Further, metal-clad switchgear (MC) is compartmentalized to isolate all components such as instrumentation, main bus, and both incoming and outgoing connections with grounded metal barriers. Rated maximum voltage levels for metal-clad switchgear (MC) range from 5 kV through 38 kV with main bus continuous current ratings of 1200 A, 2000 A, and 3000 A. Rated maximum voltage levels for station-type cubicle switchgear (SC) range from 15.5 kV through 72.5 kV with main bus continuous current ratings of 2000 A, 3000 A, 4000 A, and 5000 A. ME 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 application are discussed.

PDF Catalog

PDF Pages	PDF Title
1	Title Page
3	Introduction
5	Participants
7	CONTENTS
9	1. Scope 2. References
11	3. Definitions, qualifying terms, and common or related terms
12	3.1 General
13	3.2 Qualifying terms 3.3 Common or related terms 4. Service conditions
14	5. Ratings 5.1 General 5.2 Voltage and insulation levels
15	5.3 Rated power frequency 5.4 Rated current
16	5.5 Temperature limitations
18	5.6 Current transformer ratings
19	5.7 Current transformer accuracies 6. Tests 6.1 General
20	6.2 Design tests
35	6.3 Production tests
36	6.4 Conformance tests 6.5 Field dielectric tests
37	7. Construction 7.1 Buses and primary connections 7.2 Grounding
38	7.3 Control and secondary circuits and devices
42	7.4 Miscellaneous
43	7.5 Materials, finishes, and color
44	7.6 Precautionary labels 7.7 Barriers 7.8 Shutters 7.9 Insulating materials for covering buses and connections
45	7.10 Interlocks 7.11 Interchangeability of removable switching and interrupting devices 7.12 Primary fuses and transformers
46	7.13 Secondary disconnect devices 7.14 Control wiring 7.15 Handling device 7.16 Test cabinet 7.17 Indoor MC switchgear, access, and ventilation 7.18 Outdoor MC switchgear, access, and ventilation
47	7.19 Circuit breaker open/close position indication 7.20 Enclosure categories 7.21 Ground and test devices 7.22 Load interrupter switches 8. Application guide for MC switchgear 8.1 Unusual service conditions
51	8.2 System characteristics—voltage and frequency 8.3 Overvoltage considerations—insulation levels
52	8.4 Continuous current rating and overload capability
59	8.5 Short-circuit considerations 8.6 Nuclear power plant application 8.7 Associated devices often used in MC switchgear
60	8.8 Protection and isolation of switchgear connected to other circuit protective equipment
61	9. Guide for handling, storage, and installation 9.1 General 9.2 Handling
63	9.3 Preoperation check 9.4 Removable elements 9.5 Interlocks
64	9.6 Energizing
65	Annex A—Guide for enclosure categories and related requirements
72	Annex B—Bibliography