2441MRS751802-MUMProtection RelayTechnical Reference Manual, Standard ConfigurationsREX 521An operational characteristic example on overvoltage and undervoltage protectionis presented in the picture below (Fig. 11.5.3.-1).Fig. 11.8.3.-1 Example on overvoltage and undervoltage protection11.8.4. ConnectionsAll the necessary settings for the connections and signal routings can be set via theRelay Setting Tool or the local HMI.11.8.4.1. Protection signal routingThe trip signal (Trip 1) of the protection functions is routed to the high speed poweroutput HSPO1 (x4.2.1/2/3/4) as well as the control-open signal for the circuitbreaker. The trip signals from the protection functions are routed to the output relayvia the output switchgroups. These settings can be found inMain menu\Configuration\Output SWGRP\.As the HSPO1 is always named as the “Trip 1" output signal, the settings are madedirectly in Main menu\Configuration\Output SWGRP\Trip 1, wherethe checksum of the settings is displayed (255 by default).Using the HMI:To change the settings for Trip 1 go to Output SWGRP\Trip 1 and press the[E]-button. The different protection functions are displayed one at a time. Bypressing the [→] or [←] navigation push button, it is possible to scroll between thedifferent protections. By pressing the [↑] or [↓] navigation push button, the specificprotection function trip signal can be connected or disconnected. When the three-stage overcurrent (3I> 3I>> and 3I>>>), two-stage earth fault (I0> and I0>>), two-stage overvoltage (U> and U>>) and two-stage undervoltage (U< and U<<)protection is selected the checksum for Trip 1 is 991. When the earth fault Io>>>protection stage is selected the checksum for Trip 2 is 32.! " "1>I?/>3?I! I 33 3, 3I I )6%4/-61)6%4/-61"D , ="1F/D 3F)6"D , ="1F8D , F%D F)"D ,="1F/D , 3F)"(D ,="1F/D 3F)"((D ,!="1F/D3F)" ) + *5 + + *5 +C"+
