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REQUIREMENTS FOR CAPACITOR SWITCHES FOR AC SYSTEMS (1 KV TO 38 KV)
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Available format(s): Hardcopy, PDF
Superseded date: 24-03-2022
Language(s): English
Published date: 01-01-2006
Publisher: Institute of Electrical & Electronics Engineers
1 Scope2 Normative references3 Definitions4 Service conditions 4.1 Usual service conditions 4.2 Unusual service conditions5 Ratings 5.1 General 5.2 Rating information 5.3 Rated maximum voltage 5.4 Rated power frequency 5.5 Rated peak fault-making current 5.6 Rated symmetrical fault-making current 5.7 Rated capacitive switching current 5.8 Rated peak withstand current 5.9 Rated short-time (symmetrical) withstand current and duration 5.10 Rated high-frequency transient-making current 5.11 Rated transient inrush frequency 5.12 Rated lightning impulse withstand voltage 5.13 Rated control voltages and ranges6 Design tests 6.1 General 6.2 Insulation (dielectric) tests 6.3 Short-time current tests 6.4 Rated fault-making current tests 6.5 Operating duty tests 6.6 Condition of capacitor switch after short-time current tests, rated fault-making current tests, and operating duty tests 6.7 Temperature rise tests 6.8 Radio influence voltage tests 6.9 Mechanical life tests 6.10 Control wiring tests7 Production tests8 Construction requirements 8.1 Grounding provision 8.2 Manual operating provision 8.3 Position indicator 8.4 Nameplate markingAnnex A (informative) Fault handling ratings for capacitor switches A.1 Introduction A.2 Quantitative distinction A.3 Time constant (T[cc]) and X/R ratio A.4 Related required capabilitiesAnnex B (informative) Consideration of inrush current in back-to-back capacitor switching B.1 Introduction B.2 General application guidelines B.3 Inrush current and frequency formulas for switching capacitor banks B.4 Example equations B.5 Formula definitionsAnnex C (informative) Simultaneous opening of single-phase capacitor switches on ungrounded wye capacitor installations C.1 Introduction C.2 Application considerationsAnnex D (informative) Altitude correction factors D.1 Introduction D.2 Altitude correction factors D.3 Examples for switchgear with 110 kV lightning impulse withstand rating already rated for 1000 m D.4 Examples for switchgear ratings based on 110 kV lightning impulse withstand rating referred to sea level NTP without adjustment for 1000 m
Required definitions, ratings, and procedures for performing design tests, production tests, and construction requirements for capacitor switches for ac systems from 1 kV to 38 kV are covered.
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