IEEE-C37.20.6-2007.pdf

IEEE Std C37.20.6-2007 (Revision of IEEE Std C37.20.6-1997) IEEE Standard for 4.76 kV to 38 kV Rated Ground and Test Devices Used in Enclosures IEEE 3 Park Avenue New York, NY 10016-5997, USA 18 March 2008 IEEE Power Engineering Society Sponsored by the Switchgear Committee C37.20.6 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 01:49:28 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 01:49:28 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C37.20.6-2007 (Revision of IEEE Std C37.20.6-1997) IEEE Standard for 4.76 kV to 38 kV Rated Ground and Test Devices Used in Enclosures Sponsor Switchgear Committee of the IEEE Power Engineering Society Approved 5 December 2007 IEEE-SA Standards Board Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 01:49:28 MDTNo reproduction or networking permitted without license from IHS -,-,- Abstract: Drawout-type ground and test devices for use in medium-voltage metal-clad switchgear rated 4.76 kV through 38 kV are covered. The description, design, and testing of these accessory devices that are inserted in place of drawout circuit breakers for the purpose of grounding and testing are also covered. Keywords: electrical operation, ground and test (G +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 01:49:28 MDTNo reproduction or networking permitted without license from IHS -,-,- iv Copyright © 2008 IEEE. All rights reserved. Introduction This introduction is not part of IEEE Std C37.20.6-2007, IEEE Standard for 4.76 kV to 38 kV Rated Ground and Test Devices Used in Enclosures. Although ground and test (G the peak current value shall be 2.6 times its rated short-time current, at the major peak of the maximum 4 Copyright © 2008 IEEE. All rights reserved. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 01:49:28 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C37.20.6-2007 IEEE Standard for 4.76 kV to 38 kV Rated Ground and Test Devices Used in Enclosures cycle, and the rms total current shall be 1.55 times its rated short-time current, as determined from the envelope of the current wave. This rating shall be no less than the rated closing and latching current capability of the circuit breaker it is intended to replace. 5.6 5.7 6. 6.1 a) b) 6.2 Rated control voltage The rated control voltage of an electrically operated G the peak current value shall be 2.6 times the rated short-time withstand current at the major peak of the maximum cycle; the rms total current shall be 1.55 times the rated short-time current, as determined from the envelope of the current wave. This rating shall be no less than the required closing and latching current capability of the circuit breaker it is intended to replace. Functional components The functional components required for manual and electrical G All insulating surfaces, including but not limited to the primary support insulation, voltage probes, and isolation barriers, should be clean and dry. All primary circuits, including cables and connections, should be clean and tight. All primary and ground disconnect contacts (including terminal sector switch, if provided) should be clean, with the correct contacts in place and properly lubricated. 17 Copyright © 2008 IEEE. All rights reserved. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 01:49:28 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C37.20.6-2007 IEEE Standard for 4.76 kV to 38 kV Rated Ground and Test Devices Used in Enclosures d) e) f) The electrical G&T device mechanism(s), including terminal selector switch if provided, should be in proper mechanical and electrical operating condition. All locks and interlocks should be fully functional in accordance with the instruction manual of the G&T device. A 1 min power frequency voltage withstand test should be conducted on the complete G&T device in accordance with 7.4.2, except at 75% of the rated values. NOTEField tests may be conducted with dc voltage sources provided that the instantaneous dc voltage is no more than 1.414 times 75% of the normal frequency withstand ac rms voltage listed in Table 1 of IEEE Std C37.20.2-1999. 18 Copyright © 2008 IEEE. All rights reserved. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 01:49:28 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std C37.20.6-2007 IEEE Standard for 4.76 kV to 38 kV Rated Ground and Test Devices Used in Enclosures Annex A (informative) Bibliography B1 IEEE 100, The Authoritative Dictionary of IEEE Standards Terms, Seventh Edition, New York, Institute of Electrical and Electronics Engineers, Inc.8, 9 B2 IEEE Std C37.04, IEEE Standard Rating Structure for AC High-Voltage Circuit Breakers. B3 IEEE Std C37.100, IEEE Standard Definitions for Power Switchgear. B4 Code of Federal Regulations Title 29 Part 1910 Section 269 (29CFR1910.269), Occupational Safety and Healthy StandardsElectric Power Generation, Transmission, and Distribution.10 B5 Code of Federal Regulations Title 29 Part 1910 Section 332 (29CFR1910.332), Occupational Safety and Healthy StandardsTraining. B6 Code of Federal Regulations Title 29 Part 1910 Section 399 (29CFR1910.399), Occupational Safety and Healthy StandardsDefinitions applicable to this subpart. B7 Code of Federal Regulations Title 29 Part 1926 Section 449 (29CFR1926.449), Safety and Health Regulations for ConstructionDefinitions applicable to this subpart. 8 IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, Piscataway, NJ 08854, USA (http:/standards.ieee.org/). 9 The IEEE standards or products referred to in this clause are trademarks of the Institute of Electrical and Electronics Engineers, Inc. 10 CFR publications are available from the Superintendent of Documents, U.S. Government Printing Office, P.O. Box 37082, Washington, DC 20013-7082, USA (http:/www.access.gpo.gov/). 19 Copyright © 2008 IEEE. All rights reserved. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 01:49:28 MDTNo reproduction or networking permitted without license from IHS -,-,-