GE Multilin
L30 Line Current Differential System
5-215
5 SETTINGS
5.7 CONTROL ELEMENTS
5
e) BROKEN CONDUCTOR DETECTION
PATH: SETTINGS
CONTROL ELEMENTS
MONITORING ELEMENTS
BROKEN CONDUCTOR 1(2)
Two broken conductor detection elements are provided.
The broken conductor function will detect a transmission line broken conductor condition or a single-pole breaker malfunc-
tion condition through checking the phase current input signals and the I_2 / I_1 ratio. The intention of this function is to
detect a single-phase broken conductor only. As such two-phase or three-phase broken conductors cannot be detected.
To distinguish between single-phase disappearance and system disturbance in all three phases (such as load change,
switching, etc.), the broken conductor element monitors the change in all three phase currents at the present instance and
at four cycles previous. It also monitors changes in the I_2 / I_1 ratio, I_1 minimum, and I_1 maximum.
The broken conductor function should not be used to respond to fault transients and single-pole tripping/reclosing condi-
tions. Therefore, the time delay should be programmed to a sufficient length to ensure coordination with the breaker dead
time of the recloser function.
•
BROKEN CONDUCTOR 1 FUNCTION
: This setting enables and disables the broken conductor function.
•
BROKEN CONDUCTOR 1 SOURCE
: This setting selects a signal source used to provide three-phase current inputs
to this function.
•
BROKEN CONDUCTOR 1 I2/I1 RATIO
: This setting specifies the ratio of negative-sequence current to positive-
sequence current. When one phase conductor is broken, the I_2 / I_1 ratio with a balanced remaining two phases is
50%. So normally this setting should be set below 50% (for example, to 30%).
•
BROKEN CONDUCTOR 1 I1 MIN
: This setting specifies the minimum positive-sequence current supervision level.
Ensure this setting is programmed to a sufficient level to prevent I_2 / I_1 from erratic pickup due to a low I_1 signal.
However, this setting should not be set too high, since the broken conductor condition cannot be detected under light
load conditions when I_1 is less than the value specified by this setting.
•
BROKEN CONDUCTOR 1 I1 MAX
: This setting specifies the maximum I_1 level allowed for the broken conductor
function to operate. When I_1 exceeds this setting, this it is considered a fault. This broken conductor function should
not respond to any fault conditions, so normally this setting is programmed to less than the maximum load current.
•
BROKEN CONDUCTOR 1 PKP DELAY
: This setting specifies the pickup time delay for this function to operate after
assertion of the broken conductor pickup FlexLogic operand.
BROKEN CONDUCTOR 1
BROKEN CONDUCTOR 1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
BROKEN CONDUCTOR 1
SOURCE: SRC 1
Range: SRC 1, SRC 2
MESSAGE
BROKEN CONDUCTOR 1
I2/I1 RATIO:
20%
Range: 20.0% to 100.0% in steps of 0.1%
MESSAGE
BROKEN CONDUCTOR 1
I1 MIN: 0.10 pu
Range: 0.05 to 1.00 pu in steps of 0.01
MESSAGE
BROKEN CONDUCTOR 1
I1 MAX: 1.50 pu
Range: 0.05 to 5.00 pu in steps of 0.01
MESSAGE
BROKEN CONDUCTOR 1
PKP DELAY: 20.000 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
BROKEN CONDCT 1 BLK:
Off
Range: FlexLogic operand
MESSAGE
BROKEN CONDUCT 1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
BROKEN CONDUCT 1
EVENTS: Disabled
Range: Disabled, Enabled
Summary of Contents for L30
Page 10: ...x L30 Line Current Differential System GE Multilin TABLE OF CONTENTS ...
Page 30: ...1 20 L30 Line Current Differential System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 370: ...5 244 L30 Line Current Differential System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 464: ...A 10 L30 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 600: ...C 30 L30 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 610: ...D 10 L30 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 622: ...E 12 L30 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 634: ...F 12 L30 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 644: ...x L30 Line Current Differential System GE Multilin INDEX ...