Ground Current - GE Multilin g60 Instruction Manual

5.6 GROUPED ELEMENTS
SETTING
NEUTRAL DIR OC1
FUNCTION:
Disabled=0
Enabled=1
SETTING
AND
NEUTRAL DIR OC1 BLK:
Off=0
SETTING
NEUTRAL DIR OC1
SOURCE:
NEUTRAL DIR OC1 POL
VOLT:
NEUTRAL DIR OC1 OP
CURR:
}
Measured VX
Calculated V_0
Zero Seq Crt (I_0)
Ground Crt (IG)
SETTING
NEUTRAL DIR OC1
POLARIZING:
5
Voltage
OR
Current
Dual OR
NOTE:
1) CURRENT POLARIZING IS POSSIBLE ONLY IN RELAYS WITH
THE GROUND CURRENT INPUTS CONNECTED TO
AN ADEQUATE CURRENT POLARIZING SOURCE
2) GROUND CURRENT CAN NOT BE USED FOR POLARIZATION
AND OPERATION SIMULTANEOUSLY
3) POSITIVE SEQUENCE RESTRAINT IS NOT APPLIED WHEN
_1 IS BELOW 0.8pu
a) MAIN MENU

PATH: SETTINGS GROUPED ELEMENTS
 GROUND CURRENT

The G60 relay contains one Ground Time Overcurrent, one Ground Instantaneous Overcurrent, and four Restricted Ground
Fault elements. Refer to Inverse Time Overcurrent Characteristics on page 5–150 for additional information.
5-168
SETTING
NEUTRAL DIR OC1 FWD
PICKUP:
NEUTRAL DIR OC1 OP
CURR:
NEUTRAL DIR OC1 POS-
SEQ RESTRAINT:
RUN
3( _0 - K _1 ) PICKUP
G
SETTINGS
AND
NEUTRAL DIR OC1 FWD
ECA:
NEUTRAL DIR OC1 FWD
LIMIT ANGLE:
NEUTRAL DIR OC1 REV
LIMIT ANGLE:
NEUTRAL DIR OC1
OFFSET:
RUN
FWD
}
REV
Voltage Polarization
G 0.05 pu
AND RUN
Current Polarization
SETTING
NEUTRAL DIR OC1 REV
PICKUP:
NEUTRAL DIR OC1 OP
CURR:
NEUTRAL DIR OC1 POS-
SEQ RESTRAINT:
RUN
3( _0 - K _1 ) PICKUP
G
Figure 5–81: NEUTRAL DIRECTIONAL OVERCURRENT LOGIC

SETTING GROUP 1(6)
 GROUND TOC1

 GROUND IOC1
MESSAGE

 RESTRICTED GROUND
MESSAGE
 FAULT 1
 RESTRICTED GROUND
MESSAGE
 FAULT 4
G60 Generator Protection System
OR
PICKUP
AND
FWD
OR
-3V_0
AND
3I_0
REV
FWD
OR
REV
AND
OR
PICKUP


GROUND CURRENT

See page 5–169.
See page 5–170.
See page 5–171.

5 SETTINGS
FLEXLOGIC OPERAND
AND NEUTRAL DIR OC1 FWD
1.25 cy
1.5 cy
FLEXLOGIC OPERAND
NEUTRAL DIR OC1 REV
827077AB.CDR
5.6.8 GROUND CURRENT
GE Multilin