RjXOperating characteristicImpedance locus atpower swingIEC09000224_1_en.vsdIEC09000224 V1 EN-USFigure 66: Impedance plane with Power swing detection operatingcharacteristic and impedance locus at power swing7.2.2.2 Basic characteristics M13874-11 v6Power swing detection function (ZMRPSB) reliably detects power swings withperiodic time of swinging as low as 200 ms (which means slip frequency as high as10% of the rated frequency on the 50 Hz basis). It detects the swings under normalsystem operation conditions as well as during the dead time of a single-poleautomatic reclosing cycle.ZMRPSB function is able to secure selective operation for internal faults duringpower swing. The operation of the distance protection function remains stable forexternal faults during the power swing condition, even with the swing (electrical)centre located on the protected power line.The operating characteristic of the ZMRPSB function is easily adjustable to theselected impedance operating characteristics of the corresponding controlleddistance protection zones as well as to the maximum possible load conditions ofthe protected power lines. See the corresponding description in “Technicalreference manual” for the IEDs.7.2.3 Setting guidelines SEMOD52042-5 v5Setting guidelines are prepared in the form of a setting example for the protectedpower line as part of a two-machine system presented in figure 67.1MRK 505 393-UEN B Section 7Impedance protectionLine differential protection RED650 2.2 IEC 135Application manual
