
GE Multilin
G30 Generator Protection System
5-241
5 SETTINGS
5.7 CONTROL ELEMENTS
5
•
CT FAIL 1 3V0 INPUT:
This setting selects the voltage source.
•
CT FAIL 1 3V0 INPUT PICKUP:
This setting specifies the pickup value for the 3V_0 source.
•
CT FAIL 1 PICKUP DELAY:
This setting specifies the pickup delay of the CT failure element.
Figure 5–113: CT FAILURE DETECTOR SCHEME LOGIC
c) VT FUSE FAILURE
PATH: SETTINGS
CONTROL ELEMENTS
MONITORING ELEMENTS
VT FUSE FAILURE 1(4)
Every signal source includes a fuse failure scheme.
The VT fuse failure detector can be used to raise an alarm and/or block elements that may operate incorrectly for a full or
partial loss of AC potential caused by one or more blown fuses. Some elements that might be blocked (via the
BLOCK
input)
are distance, voltage restrained overcurrent, and directional current.
There are two classes of fuse failure that occur:
•
Class A: loss of one or two phases.
•
Class B: loss of all three phases.
Different means of detection are required for each class. An indication of class A failures is a significant level of negative-
sequence voltage, whereas an indication of class B failures is when positive sequence current is present and there is an
insignificant amount of positive sequence voltage. Also rapid decrease in the phase voltages magnitude from a healthy
voltage level without disturbance in current can indicate a VT fuse fail conditions. These noted indications of fuse failure
can also be present when faults are present on the system, so a means of detecting faults and inhibiting fuse failure decla-
rations during these events is provided.
VT FUSE FAILURE 1
VT FUSE FAILURE 1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
NEUTRAL WIRE OPEN 1
DETECTION: Disabled
Range: Disabled, Enabled
MESSAGE
NEUTRAL WIRE OPEN 1
3 HARM PKP: 0.100
Range: 0.000 to 3.000 pu in steps of 0.001
CT FAIL 1 FUNCTION:
CT FAIL 1 BLOCK:
CT FAIL 1 3IO INPUT1:
CT FAIL 1 3IO INPUT1 PKP:
CT FAIL 1 3VO INPUT:
CT FAIL 1 3VO INPUT:
CT FAIL 1 3IO INPUT2:
CT FAIL 1 3IO INPUT2 PKP:
CT FAIL 1 PICKUP DELAY:
AND
OR
SETTING
Enabled=1
SETTING
SETTING
SETTING
SETTING
SETTING
SETTING
SETTING
SETTING
Off=0
SRC1
RUN
3IO > PICKUP
3IO > PICKUP
3VO > PICKUP
SRC1
RUN
SRC2
RUN
FLEXLOGIC OPERANDS
CT FAIL 1 OP
CT FAIL 1 PKP
827048A8.CDR
0
Summary of Contents for G30
Page 10: ...x G30 Generator Protection System GE Multilin TABLE OF CONTENTS ...
Page 30: ...1 20 G30 Generator Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 414: ...5 274 G30 Generator Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 484: ...11 12 G30 Generator Protection System GE Multilin 11 6 DISPOSAL 11 MAINTENANCE 11 ...
Page 512: ...A 28 G30 Generator Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 620: ...B 108 G30 Generator Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 666: ...E 10 G30 Generator Protection System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Page 678: ...F 12 G30 Generator Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...