GE B30 Instruction Manual page 431

Bus differential system
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CHAPTER 5: SETTINGS
Using the drop-out undervoltage operand as the Block input to the differential element is not recommended. The
differential element includes the saturation detector that responds to certain time relationships between the differential
and restraining currents, and therefore, it must be operational all the time in order to function properly.
This element is used to give a time-delay operating characteristic versus the applied fundamental voltage (phase-to-
ground or phase-to-phase for wye VT connection, or phase-to-phase for delta VT connection) or as a definite time
element. The element resets instantaneously if the applied voltage exceeds the dropout voltage. The delay setting selects
the minimum operating time of the phase undervoltage. The minimum voltage setting selects the operating voltage below
which the element is blocked (a setting of "0" allows a dead source to be considered a fault condition).
5.7.8.3 Phase overvoltage (ANSI 59P, IEC PTOV)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  VOLTAGE ELEMENTS  PHASE OVERVOLTAGE1
 PHASE
 OVERVOLTAGE1
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Figure 5-116: Phase undervoltage1 logic
PHASE OV1
FUNCTION: Disabled
PHASE OV1 SIGNAL
SOURCE: SRC 1
PHASE OV1
PICKUP: 1.000 pu
PHASE OV1 PICKUP
DELAY: 1.00 s
PHASE OV1 RESET
DELAY: 1.00 s
PHASE OV1 BLOCK:
Off
PHASE OV1
TARGET: Self-reset
PHASE OV1
EVENTS: Disabled
GROUPED ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0.004 to 3.000 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
5
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