GE Multilin F60 Feeder Protection System 5-1775 SETTINGS 5.6 GROUPED ELEMENTS5d) NEUTRAL OVERVOLTAGE (ANSI 59N)PATH: SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) VOLTAGE ELEMENTS 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 SYSTEM SETUP AC INPUTS VOLTAGE BANK 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 PICKUP DELAY setting applies only ifthe NEUTRAL OV1 CURVE setting is “Definite time”. The source assigned to this element must be configured for a phase VT.VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs tobe wye-connected.Figure 5–86: 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
