GE B30 UR Series Instruction Manual page 256

5.6 GROUPED ELEMENTS
d) PHASE INSTANTANEOUS OVERCURRENT (ANSI 50P, IEC PIOC)
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PATH: SETTINGS GROUPED ELEMENTS
 PHASE IOC1

5
Six instantaneous overcurrent elements facilitate applications including an external check zone function. For bus configura-
tions of up to five feeders, each with a second set of CTs, a check zone can be implemented by externally summing cur-
rents from the independent sets of CTs and connecting the resulting differential current to the sixth current input. In this
case, one element monitors the independently formed differential current and supervises the differential protection.
If applied, the overcurrent function responding to the independently formed differential signal should be used to supervise
the output from the main differential protection with a FlexLogic AND gate before driving the output contact. It is not recom-
mended to use the drop-out operand of the overcurrent function as the block input to the differential element. The differen-
tial element includes the saturation detector that responds to specific time relationships between the differential and
restraining currents, and therefore, it must be operational all the time in order to function properly.
The phase instantaneous overcurrent element may be used as an instantaneous element with no intentional delay or as a
definite time element. The input current is the fundamental phasor magnitude. For timing curves, see the publication Instan-
taneous Overcurrent Element Response to Saturated Waveforms in UR-Series Relays (GET-8400A).
5-134

SETTING GROUP 1(6)
PHASE IOC1
FUNCTION: Disabled
PHASE IOC1 SIGNAL
MESSAGE
SOURCE: SRC 1
PHASE IOC1
MESSAGE
PICKUP:
PHASE IOC1 PICKUP
MESSAGE
DELAY:
PHASE IOC1 RESET
MESSAGE
DELAY:
PHASE IOC1 BLOCK A:
MESSAGE
Off
PHASE IOC1 BLOCK B:
MESSAGE
Off
PHASE IOC1 BLOCK C:
MESSAGE
Off
PHASE IOC1
MESSAGE
TARGET: Self-reset
PHASE IOC1
MESSAGE
EVENTS: Disabled
B30 Bus Differential System

PHASE CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0.000 to 30.000 pu in steps of 0.001
1.000 pu
Range: 0.00 to 600.00 s in steps of 0.01
0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
0.00 s
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS

PHASE IOC 1(6)
GE Multilin