GE Multilin
C70 Capacitor Bank Protection and Control System
5-173
5 SETTINGS
5.6 GROUPED ELEMENTS
5
•
NEUTRAL DIR OC1 FWD PICKUP:
This setting defines the pickup level for the overcurrent unit of the element in the
forward 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.
•
NEUTRAL DIR OC1 REV LIMIT ANGLE:
This setting defines a symmetrical (in both directions from the ECA) limit
angle for the reverse direction.
•
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.
Figure 5–68: NEUTRAL DIRECTIONAL OVERCURRENT LOGIC
e) NEUTRAL CURRENT UNBALANCE
(ANSI 60N, IEC PVCB/PTOC)
PATH: SETTINGS
GROUPED...
SETTING GROUP 1(6)
NEUTRAL CURRENT
NEUTRAL CURRENT UNBALANCE 1(3)
NEUTRAL CURRENT
UNBALANCE 1
NTRL CUR UNBALCE 1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
NTRL CUR UNBALCE 1
BANK SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
SETTING
SETTING
SETTING
SETTING
SETTINGS
SETTING
SETTING
NEUTRAL DIR OC1
FUNCTION:
NEUTRAL DIR OC1
SOURCE:
NEUTRAL DIR OC1 POL
VOLT:
NEUTRAL DIR OC1 OP
CURR:
NEUTRAL DIR OC1
POLARIZING:
NEUTRAL DIR OC1 BLK:
NEUTRAL DIR OC1 FWD
LIMIT ANGLE:
NEUTRAL DIR OC1 FWD
ECA:
NEUTRAL DIR OC1 REV
LIMIT ANGLE:
NEUTRAL DIR OC1
OFFSET:
NEUTRAL DIR OC1 FWD
PICKUP:
NEUTRAL DIR OC1 REV
PICKUP:
NEUTRAL DIR OC1 OP
CURR:
NEUTRAL DIR OC1 OP
CURR:
NEUTRAL DIR OC1 FWD
NEUTRAL DIR OC1 REV
Measured VX
Voltage
Calculated V_0
}
}
Current
Ground Crt (IG)
Zero Seq Crt (I_0)
Dual, Dual-V, Dual-I
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
I_1 IS BELOW 0.8pu
827077AE.CDR
Off=0
Enabled=1
AND
AND
AND
AND
AND
AND
AND
OR
OR
OR
OR
IG 0.05 pu
3( I_0 - K I_1 ) PICKUP
3( I_0 - K I_1 ) PICKUP
IG PICKUP
IG PICKUP
Voltage Polarization
Current Polarization
-3V_0
3I_0
FWD
FWD
FWD
REV
REV
REV
RUN
RUN
RUN
OR
OR
RUN
1.25 cy
1.5 cy
NEUTRAL DIR OC1 POS-
SEQ RESTRAINT:
NEUTRAL DIR OC1 POS-
SEQ RESTRAINT:
IG 0.05 pu
Summary of Contents for C70
Page 10: ...x C70 Capacitor Bank Protection and Control System GE Multilin TABLE OF CONTENTS ...
Page 394: ...5 270 C70 Capacitor Bank Protection and Control System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 676: ...E 10 C70 Capacitor Bank Protection and Control System GE Multilin E 1 OVERVIEW APPENDIX E E ...
Page 698: ...H 8 C70 Capacitor Bank Protection and Control System GE Multilin H 3 WARRANTY APPENDIX H H ...