5-40 L90 Line Differential Relay GE Multilin5.3 SYSTEM SETUP 5 SETTINGS55.3.4 L90 POWER SYSTEMPATH: SETTINGS !" POWER SYSTEM !" L90 POWER SYSTEMAny changes to the L90 Power System settings will change the protection system configuration. As such,the 87L protection at all L90 protection system terminals must be temporarily disabled to allow the relaysto acknowledge the new settings.ï NUMBER OF TERMINALS: This setting is the number of the terminals of the associated protected line.ï NUMBER OF CHANNELS: This setting should correspond to the type of communications module installed. If the relayis applied on two terminal lines with a single communications channel, this setting should be selected as "1". For a twoterminal line with a second redundant channel for increased dependability, or for three terminal line applications, thissetting should be selected as "2".ï CHARGING CURRENT COMPENSATION: This setting enables/disables the charging current calculations and cor-rections of current phasors. The voltage signals used for charging current compensation are taken from the sourceassigned with the CURRENT DIFF SIGNAL SOURCE 1 setting. As such, it's critical to ensure that three-phase line voltage isassigned to this source. The following diagram shows possible configurations.# L90 POWER SYSTEM#NUMBER OF TERMINALS:2Range: 2, 3MESSAGE NUMBER OF CHANNELS:1Range: 1, 2MESSAGE CHARGING CURRENTCOMPENSATN: DisabledRange: Disabled, EnabledMESSAGE POS SEQ CAPACITIVEREACTANCE: 0.100 kΩRange: 0.100 to 65.535 kΩ in steps of 0.001MESSAGE ZERO SEQ CAPACITIVEREACTANCE: 0.100 kΩRange: 0.100 to 65.535 kΩ in steps of 0.001MESSAGE ZERO SEQ CURRENTREMOVAL: DisabledRange: Disabled, EnabledMESSAGE LOCAL RELAY IDNUMBER: 0Range: 0 to 255 in steps of 1ëMESSAGE TERMINAL 1 RELAY IDNUMBER: 0Range: 0 to 255 in steps of 1MESSAGE TERMINAL 2 RELAY IDNUMBER: 0Range: 0 to 255 in steps of 1MESSAGE CHNL ASYM COMP:OffRange: FlexLogicô operandMESSAGE BLOCK GPS TIME REF:OffRange: FlexLogicô operandMESSAGE MAX CHNL ASYMMETRY:1.5 msRange: 0.0 to 10.0 ms in steps of 0.1MESSAGE ROUND TRIP TIMECHANGE: 1.5 msRange: 0.0 to 10.0 ms in steps of 0.1NOTE
