IEEE C37.20.7-2017 - IEEE Guide for Testing Switchgear Rated Up to 52 kV for Internal Arcing Faults

Standard Details

Procedures for testing and evaluating the performance of switchgear for internal arcing faults is covered. A method of identifying the capabilities of this equipment is given. Service conditions, installation, and application of equipment are also discussed. As used in this document, the term switchgear is used as a general term covering switching and interrupting devices and their combination with associated control, instrumentation, metering, protective and regulating devices, assemblies of those devices with associated interconnections, accessories, and supporting structures used primarily in conjunction with the generation, transmission, distribution, and conversion of electrical power.

Standards Committee	PE/SWG - Switchgear
Status	Active
Board Approval	2017-12-06
History	Published Date:2018-02-07

Additional Resources Details

PAR	Approved PAR

Working Group Details

Working Group	SASC-WG_C37.20.7 - SASC - IEEE Working Group Arc Fault Testing
Working Group Chair	Dan Hrncir
Standards Committee	PE/SWG - Switchgear
Society	IEEE Power and Energy Society
IEEE Program Manager	Christy Bahn
Active Projects	Active PC37.20.7-2017/Cor 1 - Guide for Testing Switchgear Rated Up to 52 kV for Internal Arcing Faults - Corrigendum 1: IEEE Guide for Testing Switchgear Rated Up to 52 kV for Internal Arcing Faults - Corrigendum 1 This Corrigendum provides test current calibration information specific to testing faults initiated as a two-phase event as instructed in Case 3 of 5.4.3 Arc-initiating wire placement.
	Active PC37.20.7 - Guide for Testing Switchgear Rated Up to 52 kV for Internal Arcing Faults This guide establishes methods by which equipment may be tested for resistance to the effects of arcing due to an internal fault. Equipment types covered in this guide include metal-enclosed switchgear as defined by IEEE Std C37.20.1?, IEEE Std C37.20.2?, IEEE Std C37.20.3? and IEEE Std C37.20.9?; metal-enclosed bus as defined by IEEE Std C37.23?; medium-voltage ac controllers as defined by UL 347; motor control centers as defined by UL 845; switchboards as defined by UL 891; and metal-enclosed medium-voltage air-insulated circuit breakers for outdoor application defined by IEEE Std C37.04? (see note). This guide applies only to equipment utilizing air or other insulating gas as the primary insulation medium and rated 52 kV ac or below. It applies to both indoor and outdoor equipment; however, special consideration should be given to the building size and construction for indoor applications (not fully addressed by this document). The tests and assessments described in this guide are only applicable to arcing faults occurring entirely in air within the enclosure when doors and covers are properly secured in accordance with the rated accessibility type. This guide does not apply to arcing faults that occur within components of the equipment, such as instrument transformers, sealed interrupting devices, fuses, and so on. Designs that meet the requirements of this guide will be referred to as arc-resistant. NOTE?These circuit breakers are sometimes referred to as dead-tank circuit breakers
Existing Standards	Superseded IEEE C37.20.7-2007 - IEEE Guide for Testing Metal-Enclosed Switchgear Rated Up to 38 kV for Internal Arcing Faults Revision of IEEE Std C37.20.7-2001. A procedure for testing and evaluating the performance of metal-enclosed switchgear for internal arcing faults is covered. A method of identifying the capabilities of this equipment is given. Service conditions, installation, and application of equipment are also discussed.
	Superseded IEEE C37.20.7-2007/Cor 1-2010 - IEEE Guide for Testing Metal-Enclosed Switchgear Rated up to 38 kV for Internal Arcing Faults Corrigendum 1 This corrigendum corrects technical errors found in IEEE Std C37.20.7-2007 during use in laboratories concerning current values and arc initiation in low-voltage (LV) testing and supply frequency for all equipment.