GE B90 Instruction Manual page 224

5.5 GROUPED ELEMENTS
The instantaneous overcurrent element is used primarily for supervising main protection trip commands on a per-breaker
basis (that is, differential, breaker failure, and end fault protection). It responds to a single-phase current. If the intention is
to allow three-phase tripping if any phase current is above the threshold, the appropriate FlexLogic™ operands are passed
between the IEDs using the B90 fiber optic communications (Direct I/Os).
Instantaneous Overcurrent supervision can also be used to prevent tripping feeders with low currents or for definite time
backup protection.
The pickup setting is specified in per unit values. The nominal current as entered under

RENT BANK XY CT XY SECONDARY
tection". One instantaneous overcurrent element is available per each CT input of the relay.
SETTING
B90 FUNCTION:
Logic = 0
Protection = 1
SETTING
IOC 1 FUNCTION:
Disabled = 0
Enabled = 1
SETTING
IOC 1 BLOCK:
Off = 0
5
SETTING
IOC 1 CT:
Current Magnitude, |I|
d) TIME OVERCURRENT

PATH: SETTINGS GROUPED ELEMENTS
 TIME
 OVERCURRENT 1
5-104
is 1 p.u. The element can be effectively enabled only when
SETTING
IOC 1 PICKUP:
RUN
Figure 5–45: INSTANTANEOUS OVERCURRENT LOGIC

SETTING GROUP 1(6)
TOC1 FUNCTION:
Disabled
TOC1 CT:
MESSAGE
F1
TOC1 PICKUP:
MESSAGE
1.200 pu
TOC1 CURVE:
MESSAGE
IEEE Mod Inv
TOC1 TD MULTIPLIER:
MESSAGE
1.00
TOC1 RESET:
MESSAGE
Instantaneous
TOC1 BLOCK:
MESSAGE
Off
TOC1 TARGET:
MESSAGE
Self-Reset
TOC1 EVENTS:
MESSAGE
Disabled
B90 Low Impedance Bus Differential System
SETTINGS
IOC 1 PICKUP DELAY:
IOC 1 RESET DELAY:
t
PKP
| I | > PICKUP

CURRENT ELEMENTS
Range: Disabled, Enabled
Range: Available current channels
Range: 0.000 to 30.000 pu in steps of 0.001
Range: see OVERCURRENT CURVE TYPES table
Range: 0.00 to 600.00 in steps of 1
Range: Instantaneous, Timed
Range: FlexLogic™ operand
Range: Self-Reset, Latched, Disabled
Range: Enabled, Disabled
5 SETTINGS

SYSTEM SETUP AC INPUTS
is set to "Pro-
B90 FUNCTION
FLEXLOGIC OPERANDS
IOC 1 OP
t
IOC 1 DPO
RST
IOC 1 PKP

TIME OVERCURRENT 1(24)
GE Multilin

CUR-