Section 4 1MAC309294-MB FProtection functions264 RER620Technical Manual4.5.6.2 Function blockFigure 129: Function block4.5.6.3 FunctionalityDirectional negative/zero sequence power protection (32N) is used to detect negative orresidual power direction. The output of the function is used for blocking or releasing otherfunctions in protection scheme.In negative sequence voltage selection, if the angle difference between negative sequencevoltage and negative sequence current is in predefined direction (either in forward orreverse direction), 32N gives release signal after a definite time delay.In residual voltage selection, if the angle difference between residual voltage and residualcurrent is in predefined direction (either in forward or reverse direction), 32N gives releasesignal after a definite time delay.This function contains a blocking functionality which blocks the function output and resetsthe timer.4.5.6.4 Operation principleThe Operation setting is used to enable or disable the function. When selected “On” thefunction is enabled and respectively “Off” means function is disabled.The operation of 32N can be described by using a module diagram (see Figure 130). Allthe modules in the diagram are explained in the next sections.RELEASEVG32NI2V2VNINIGBLOCKRCA_CTL
