input BLKx. The trip signals from the function can be blocked from the binary inputBLKTR.8.2.7.8 Directional supervision element with integrated directional comparisonfunction M13941-179 v11At least one of the four residual overcurrent steps shall be set asdirectional in order to enable execution of the directional supervisionelement and the integrated directional comparison function.The protection has an integrated directional feature. As the operating quantity currentIop is always used, the polarizing method is determined by the parameter settingpolMethod. The polarizing quantity will be selected by the function in one of thefollowing three ways:1. When polMethod = Voltage, VPol will be used as polarizing quantity.2. When polMethod = Current, IPol will be used as polarizing quantity.3. When polMethod = Dual, VPol + IPol · ZNPol will be used as polarizing quantity.The operating and polarizing quantity are then used inside the directional element, asshown in Figure 60, in order to determine the direction of the ground fault.1MRK 511 408-UUS A Section 8Current protectionPhasor measurement unit RES670 2.2 ANSI 205Technical manual
