6.2.7 Technical dataTable 36:(21) Technical dataFunction Range or value AccuracyMinimum operate current (5-500)% of IBase ± 1.0% of InReactive reach, positivesequence(0.50–3000.00) Ω/phase ± 2.0% static accuracyConditions:Voltage range: (0.1-1.1) x VnCurrent range: (0.5-30) x InAngle: at 0 degrees and 85degreesReactive reach, zero sequence,forward and reverse(0.50 - 3000.00) Ω/loopFault resistance, phase-to-ground faults, forward andreverse(1.00–9000.00) Ω/loopFault resistance, phase-to-phasefaults, forward and reverse(0.50–3000.00) Ω/loopLoad encroachment criteria:Load resistance, forward andreverseSafety load impedance angle(1.00–3000.00) Ω/phase(5-70) degrees6.3 Faulty phase identification with load enchroachment formho FMPSPDIS (21)6.3.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberFaulty phase identification with loadencroachment for mhoFMPSPDISS00346 V1 EN-6.3.2 FunctionalityThe phase selection function is design to accurately select the proper fault loop(s) in thedistance function dependent on the fault type.The heavy load transfer that is common in many transmission networks may in some casesinterfere with the distance protection zone reach and cause unwanted operation. Thereforethe function has a built in algorithm for load encroachment.The output signals from the phase selection function produce important information aboutfaulty phase(s), which can be used for fault analysis as well.1MRK 506 335-UUS A Section 6Impedance protection147Technical manual
