GE b30 Instruction Manual page 366

GROUPED ELEMENTS
At 0% of pickup, the operating time equals the
5.7.8.2 Phase undervoltage (ANSI 27P, IEC PTUV)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  VOLTAGE ELEMENTS  PHASE UNDERVOLTAGE1(3)
5
 PHASE
 UNDERVOLTAGE1
Three undervoltage elements facilitate applications including undervoltage supervision of the main bus differential
protection to prevent maloperation in the event of CT trouble.
In this scheme, the normal voltage level halts the differential element. An actual bus fault operates the undervoltage
element, thereby permitting the differential element to operate. This can be applied for bus configurations of up to five
feeders with the voltage signal available. If applied, use the undervoltage function to supervise the main differential output
with an AND gate in the FlexLogic equation before driving the output contact.
5-200
Figure 5-102: Inverse time undervoltage curves
PHASE UNDERVOLTAGE DELAY
PHASE UV1

FUNCTION: Disabled
PHASE UV1 SIGNAL

SOURCE: SRC 1
PHASE UV1 MODE:

Phase to Ground
PHASE UV1

PICKUP: 1.000 pu
PHASE UV1

CURVE: Definite Time
PHASE UV1

DELAY: 1.00 s
PHASE UV1 MINIMUM

VOLTAGE: 0.100 pu
PHASE UV1 BLOCK:

Off
PHASE UV1

TARGET: Self-reset
PHASE UV1

EVENTS: Disabled
CHAPTER 5: SETTINGS
setting.
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: Phase to Ground, Phase to Phase
Range: 0.004 to 3.000 pu in steps of 0.001
Range: Definite Time, Inverse Time
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.000 to 3.000 pu in steps of 0.001
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL