Annual Report 2003-2004

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NRIPower Systems Control & Dispatching Research CenterProject Title:Combined Overcurrent & Earth Fault Relay, Design &ConstructionDepartment: Electronics & ControlEmployer: Niroo Research InstituteProject Staff: ---Project Manager: B. AreziProject Code: PCNPN11Summary:The combined phase and neutral overcurrent relay is used for the selective short circuitand time overcurrent protection of radial feeders in distribution networks. This relay isalso used for feeder earth fault protection in isolated neutral network and networks withresistively earthed neutral.Both the overcurrent unit and the earth fault unit feature two stage: a high-set stage anda low-set stage.Technical Specifications:Energizing inputsRated Current In1A/5AThermal withstand capability- Continuously 4A/20A- For 1s 50A/250ARated frequency50HzPower SupplySupply VoltagePower Consumption underQuiescent/Operating condition90-125V…6w/8wLow-set over current stageI>Start current.Operation Characterisitic- definite time charactersticoperating time- inverse time characteristic accto BS 142 and IEC 255-4Time multiplier K0.05…2.00In0.05…100sExtremely InverseVery InverseNormal InverseLong time Inverse0.05…1.0086
Power Systems Control & Dispatching Research CenterNRIReset time, typ.Operation accuracyOperating time accuracy at definite timeHigh-set overcurrent stageI>>Start CurrentOperating timeReset time typ.Operation accuracyOperating time accuracyLow-set earth-fault stage I0>Start current I0>Operation characteristicDefinite time characteristicDifinite operate time- inverse time characteristic acc.to BS 142 and IEC 255-4Time multiplier KReset time, type.Operation accuracyOperating time accuracyat definite timeHigh-set earth-fault stage I0>>Start current I0>>Operating timeReset time, typ.Operation accuracyOperating time accuracyEnvironmental ConditionsOperating temperature rangeStorage temperature range40ms±1% of set value±1% of set valueor±10ms0.5…20.0In0.04…100S40ms±1% of set value±1% of set valueor ±10ms0.10…0.80In0.05…100sExtremely InverseVery InverseNormal InverseLong time Inverse0.05…1.0040ms±1% of set value±1% of set value or ± 10ms0.1…4.0In0.04…100s40 ms±1% of set value±1% of set valueor ± 10ms0…55°C-20…70°CProject Results: This project is one of the first projects with this subject in Iran, which leads toconstruction of an industrial protection relay. The first constructed samples were tested87
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