GE Multilin L60 Line Phase Comparison Relay 5-1755 SETTINGS 5.5 GROUPED ELEMENTS5d) NEUTRAL OVERVOLTAGE (ANSI 59N)PATH: SETTINGS ÖØ GROUPED ELEMENTS Ö SETTING GROUP 1(6) ÖØ VOLTAGE ELEMENTS ÖØ NEUTRAL OV1(3)There are three neutral overvoltage elements available. The neutral overvoltage element can be used to detect asymmetri-cal system voltage condition due to a ground fault or to the loss of one or two phases of the source. The element respondsto the system neutral voltage (3V_0), calculated from the phase voltages. The nominal secondary voltage of the phase volt-age channels entered under SETTINGS ÖØ SYSTEM SETUP Ö AC INPUTS ÖØ VOLTAGE BANK Ö PHASE VT SECONDARY is thep.u. base used when setting the pickup level.The neutral overvoltage element can provide a time-delayed operating characteristic versus the applied voltage (initializedfrom FlexCurves A, B, or C) or be used as a definite time element. The NEUTRAL OV1(3) PICKUP DELAY setting applies only ifthe NEUTRAL OV1(3) CURVE setting is “Definite time”. The source assigned to this element must be configured for a phaseVT.VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs tobe wye-connected.Figure 5–99: NEUTRAL OVERVOLTAGE1 SCHEME LOGIC NEUTRAL OV1NEUTRAL OV1FUNCTION: DisabledRange: Disabled, EnabledMESSAGE NEUTRAL OV1 SIGNALSOURCE: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4MESSAGE NEUTRAL OV1 PICKUP:0.300 puRange: 0.000 to 3.000 pu in steps of 0.001MESSAGE NEUTRAL OV1 CURVE:Definite timeRange: Definite time, FlexCurve A, FlexCurve B,FlexCurve CMESSAGE NEUTRAL OV1 PICKUP:DELAY: 1.00 sRange: 0.00 to 600.00 s in steps of 0.01MESSAGE NEUTRAL OV1 RESET:DELAY: 1.00 sRange: 0.00 to 600.00 s in steps of 0.01MESSAGE NEUTRAL OV1 BLOCK:OffRange: FlexLogic™ operandMESSAGE NEUTRAL OV1 TARGET:Self-resetRange: Self-reset, Latched, DisabledMESSAGE NEUTRAL OV1 EVENTS:DisabledRange: Disabled, Enabled
