CHAPTER 5: SETTINGS SYSTEM SETUPL30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-1415NUMBER OF TERMINALS — This setting is the number of terminals of the protected line.NUMBER OF CHANNELS — This setting corresponds to the communications module installed. If the relay is applied on twoterminal lines with a single communications channel, select "1." For a two-terminal line with a second redundant channelfor increased dependability, or for three terminal line applications, select "2."CHARGING CURRENT COMPENSATION — This setting enables and disables the charging current calculations and correctionsof current phasors. The voltage signals used for charging current compensation are taken from the source assigned withthe CURRENT DIFF SIGNAL SOURCE 1 setting. As such, it is critical to ensure that three-phase line voltage is assigned to thissource. The figure shows possible configurations. ZERO SEQ CAPACITIVEREACTANCE: 0.100 kΩRange: 0.100 to 65.535 kΩ in steps of 0.001 ZERO SEQ CURRENTREMOVAL: DisabledRange: Disabled, Enabled LOCAL RELAY IDNUMBER: 0Range: 0 to 255 in steps of 1 TERMINAL 1 RELAY IDNUMBER: 0Range: 0 to 255 in steps of 1 TERMINAL 2 RELAY IDNUMBER: 0Range: 0 to 255 in steps of 1 CHNL ASYM COMP:OffRange: FlexLogic operand BLOCK GPS TIME REF:OffRange: FlexLogic operand MAX CHNL ASYMMETRY:1.5 msRange: 0.0 to 10.0 ms in steps of 0.1 ROUND TRIP TIMECHANGE: 1.5 msRange: 0.0 to 10.0 ms in steps of 0.1 LOCAL GPS TROUBLE:OffRange: FlexLogic operand IN-ZONE TRANSFORMERSee page 5-146Any changes to the L30 power system settings change the protection system configuration. As such, the 87Lprotection at all L30 protection system terminals must be temporarily disabled to allow the relays to acknowledgethe new settings.
