GE G30 Instruction Manual page 464

GROUPED ELEMENTS
VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs to
be wye-connected.
5.7.10.5 Negative sequence overvoltage (ANSI 59Q, IEC PTOV)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  VOLTAGE ELEMENTS  NEG SEQ OV1(3)
 NEG SEQ OV1

5
There are three negative-sequence overvoltage elements available.
Use the negative-sequence overvoltage element to detect loss of one or two phases of the source, a reversed phase
sequence of voltage, or a non-symmetrical system voltage condition.
5-250
Figure 5-132: Neutral overvoltage1 logic
NEG SEQ OV1

FUNCTION: Disabled
NEG SEQ OV1 SIGNAL

SOURCE: SRC 1
NEG SEQ OV1 PICKUP:

0.300 pu
NEG SEQ OV1 PICKUP

DELAY: 0.50 s
NEG SEQ OV1 RESET

DELAY: 0.50 s
NEG SEQ OV1 BLOCK:

Off
NEG SEQ OV1 TARGET:

Self-reset
NEG SEQ OV1 EVENTS:

Disabled
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.004 to 1.250 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS