IEEE PC37.30.3 pdf download

IEEE PC37.30.3 pdf download

IEEE PC37.30.3 pdf download IEEE Standard Requirements for High-Voltage Interrupter Switches, Interrupters, or Interrupting Aids Used on or Attached to Switches Rated for Alternating Currents Above 1000 V
1.Overview1.1 Scope
This document provides standard requirements for interrupter switches, interrupters, or interrupting aids usedon or attached to switches rated for high-voltage ac above 1000 v and used indoors, outdoors, or in enclosuresfor non-fault current interrupting for which an interrupting duty is assigned. This standard covers preferredratings, construction, application, loading, installation, operation, and maintenance guidelines. This standarddoes not apply to load-break separable insulated connectors, circuit breakers, circuit switechers, metal-enclosedswitchgear, pad-mounted switchgear, reclosers, sectionalizers or other switching devices that are covered byother IEEE standards.
1.2 Purpose
The purpose of this standard is to provide a basic standard requirement for interrupter switches, interrupters, orinterrupting aids used on or attached to switches rated for high-voltage ac above iooo v.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they shallbe understood and used, so each referenced document is cited in text and its relationship to this document isexplained).For dated references, only the edition cited applies.For undated references, the latest edition of thereferenced document (including any amendments or corrigenda) applies.
IEEE Std C37.09TM,IEEE Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on aSymmetrical Current Basis.3
IEEEStd C37.30.1TM,IEEE Standard Requirements For AC High-Voltage Air Switches Rated Above 1000 v.
IEEE Std C37.30.4TM,IEEE Standard Test Code for Switching and Fault Making Tests for High-VoltageInterrupter Switches, Interrupters or Interrupting Aids Used on or Attached to Switches Rated for AlternatingCurrents Above 1000 Volts.
IEEE Std C37.100.1TM-2007,IEEE Standard of Common Requirements for High Voltage Power SwitchgearRated Above 1000 v.
IEEE Std C37.100.2TM,IEEE Standard for Common Requirements for Testing of AC Capacitive CurrentSwitching Devices over 100o v.
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Standards DictionaryOnline should be consulted for terms not defined in this clause.5
allowable continuous current class (ACCC) designation (of an air switch): A code that identifies thecomposite curve relating the loadability factor(LF) of the switch to the ambient temperature 6, as determinedby the limiting switch part class designations.
distribution class: A descriptive term used to denote application, restriction, or both to that part of an electricsystem between the substation and the customer.
enclosed switch: Switches designated for operation within a housing restricting heat transfer to the externalmedium.
horn-gap switch: A switch provided with areing horns.
indoor switch: Switches designated for operation inside buildings or weather-resistant enclosures which donot restrict heat transfer to the ambient.
interrupter switch: A switching device designed for making specified currents and breaking specified steadystate currents.
interrupting aids: A current-interrupting device that can be attached to an air switch to improve its interruptingcapability (e.g.,quick break arcing horns; vacuum, SF6, and expulsion interrupters).
lightning impulse dry withstand voltage:The crest value of a voltage impulse with a 1.2/50 us wave form asdefined by IEEE Std 4TM[B9].6
loadability: The ratio of allowable continuous current at 25 C ambient temperature to rated continuouscurrent.
loadability factor: The ratio of allowable continuous current at a given ambient temperature to ratedcontinuous current.
making current: The value of the available current at the time the device closes.
observable temperature rise: The observable temperature rise of any part of the switch is the steady-statetemperature rise above ambient temperature.

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