5-238 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS CHAPTER 5: SETTINGS
5
There are three neutral overvoltage elements available. The neutral overvoltage element can be used to detect
asymmetrical system voltage condition due to a ground fault or to the loss of one or two phases of the source. The
element responds to the system neutral voltage (3V_0), calculated from the phase voltages. The nominal secondary
voltage of the phase voltage channels entered under
SETTINGS SYSTEM SETUP AC INPUTS VOLTAGE BANK PHASE
VT SECONDARY
is the p.u. base used when setting the pickup level.
The neutral overvoltage element can provide a time-delayed operating characteristic versus the applied voltage (initialized
from FlexCurves A, B, or C) or be used as a definite time element. The
NEUTRAL OV1 PICKUP DELAY setting applies only if the
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 to
be wye-connected.
Figure 5-125: Neutral overvoltage1 logic
5.7.8.5 Negative-sequence overvoltage (ANSI 59Q, IEC PTOV)
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) VOLTAGE ELEMENTS NEG SEQ OV1(3)
There is one negative-sequence overvoltage element available per CT bank, to a maximum of three.
NEUTRAL OV1 TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
NEUTRAL OV1 EVENTS:
Disabled
Range: Disabled, Enabled
NEG SEQ OV1
NEG SEQ OV1
FUNCTION: Disabled
Range: Disabled, Enabled
NEG SEQ OV1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
NEG SEQ OV1 PICKUP:
0.300 pu
Range: 0.004 to 1.250 pu in steps of 0.001
NEG SEQ OV1 PICKUP
DELAY: 0.50 s
Range: 0.00 to 600.00 s in steps of 0.01
NEG SEQ OV1 RESET
DELAY: 0.50 s
Range: 0.00 to 600.00 s in steps of 0.01
NEG SEQ OV1 BLOCK:
Off
Range: FlexLogic operand
NEG SEQ OV1 TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
NEG SEQ OV1 EVENTS:
Disabled
Range: Disabled, Enabled
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