Transcription of Relay symbols and device numbers; selection from IEC 617 ...
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Relay symbols and device numbers; selection from IEC 617 ...
Page 1 symbols and designationsSymbols and designations, based on the IEC 617- series ,IEC 617-7 (1983) and othersBlock symbols and qualifying symbols1. General block symbolsProtection relayThe asterisk must bereplaced by one or moreletters or qualifyingsymbols indicating theparameters of the deviceProtection Relay withenabling inputProtection Relay withblocking input2. Parameters and functionsICurrentI Reverse currentIdDifferential currentId/IPercentage differential current (current restraint)InfCurrent of nth harmonicI1, (Ip)Positive sequence current componentI2, (In)Negative sequence current componentI0, (Ih)Zero sequence current componentIrsdResidual currentI Earth fault currentI Current to frameINCurrent in the neutral conductorIN-NCurrent between neutrals of two polyphase systemsIubCurrent unbalanceUVoltagedP/dtPower derivativeQReactive powerRResistanceXReactanceZImpedancefFre quencynRotational s
based on the IEC 617-series, IEC 617-7 (1983) and others Block symbols and qualifying symbols 1. General block symbols ... allow an operating sequence to pro-ceed, to stop, or to provide a check of the position of these devices or of ... 20 Electrically operated valve is an electrically operated, controlled, or monitored valve used in a fluid, air,
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