GE UR Series B30 Instruction Manual page 262

5.6 GROUPED ELEMENTS
At 0% of pickup, the operating time equals the
NOTE
b) PHASE UNDERVOLTAGE (ANSI 27P)
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PATH: SETTINGS GROUPED ELEMENTS
5
 PHASE
 UNDERVOLTAGE1
Two 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 ele-
ment, 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.
5-138
Figure 5–61: INVERSE TIME UNDERVOLTAGE CURVES
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SETTING GROUP 1(6)
PHASE UV1
FUNCTION: Disabled
PHASE UV1 SIGNAL
MESSAGE
SOURCE: SRC 1
PHASE UV1 MODE:
MESSAGE
Phase to Ground
PHASE UV1
MESSAGE
PICKUP: 1.000 pu
PHASE UV1
MESSAGE
CURVE: Definite Time
PHASE UV1
MESSAGE
DELAY:
PHASE UV1 MINIMUM
MESSAGE
VOLTAGE: 0.100 pu
PHASE UV1 BLOCK:
MESSAGE
Off
PHASE UV1
MESSAGE
TARGET: Self-reset
PHASE UV1
MESSAGE
EVENTS: Disabled
B30 Bus Differential System
% of voltage pickup
842788A1.CDR
setting.
UNDERVOLTAGE DELAY
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VOLTAGE ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: Phase to Ground, Phase to Phase
Range: 0.000 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
1.00 s
Range: 0.000 to 3.000 pu in steps of 0.001
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS
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PHASE UNDERVOLTAGE1(3)
GE Multilin