Ground Current - GE M60 Instruction Manual

5.6 GROUPED ELEMENTS
• NEUTRAL DIR OC1 REV PICKUP: This setting defines the pickup level for the overcurrent unit of the element in the
reverse direction. When selecting this setting it must be kept in mind that the design uses a positive-sequence restraint
technique for the "Calculated 3I0" mode of operation.
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)
5
SETTING
NEUTRAL DIR OC1
POLARIZING:
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

5-160
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 5–84: NEUTRAL DIRECTIONAL OVERCURRENT LOGIC

SETTING GROUP 1(6)
 GROUND TOC1

 GROUND TOC2
MESSAGE

 GROUND IOC1
MESSAGE

 GROUND IOC2
MESSAGE

M60 Motor Protection System
OR
PICKUP
AND
FWD
OR
-3V_0
AND
3I_0
REV
FWD
OR
REV
AND
OR
PICKUP


GROUND CURRENT

See page 5-166.
See page 5-166.
See page 5-167.
See page 5-167.
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