9-8
D60 Line Distance Protection System
GE Multilin
9.3 PROTECTION SIGNALING SCHEMES
9 APPLICATION OF SETTINGS
9
For proper operation of the scheme the Zone 2 and 4 phase and ground distance elements must be enabled, configured
and set per rules of distance relaying. The Line Pickup element should be enabled, configured and set properly to detect
line-end-open/weak-infeed and undervoltage conditions.
If used by this scheme, the selected ground directional overcurrent function(s) must be enabled, configured, and set
accordingly.
The scheme generates an output operand (HYBRID POTT TX) that is used to transmit the signal to the remote end.
Choices of communications channel include Remote Inputs/Outputs and telecommunications interfaces. When used with
telecommunications facilities the output operand should be assigned to operate an output contact connected to key the
transmitter at the interface.
For more application recommendation refer to the POTT scheme.
The output operand from the scheme (HYBRID POTT OP) must be configured to interface with other relay functions, output
contacts in particular, in order to make the scheme fully operational. Typically, the output operand should be programmed to
initiate a trip, breaker fail, and auto-reclose, and drive a user-programmable LED as per user application.
9.3.6 DIRECTIONAL COMPARISON BLOCKING
Generally, the scheme compares the direction to a fault at both ends of the line. Unlike the permissive schemes, the
absence of a blocking signal permits
operation of the scheme. Consequently, the scheme is biased toward dependability
and requires an “on/off” type of signaling.
By default this scheme uses only a forward-looking over-reaching Zone 2 distance element to identify forward faults.
Ground directional overcurrent functions available in the relay can be used in conjunction with the Zone 2 distance element
to increase the coverage for high-resistance faults.
By default the scheme uses only a reverse-looking Zone 4 distance element to identify reverse faults. Ground directional
overcurrent functions available in the relay can be used in conjunction with the Zone 4 distance element for better time and
sensitivity coordination.
For proper operation of the scheme the Zone 2 and 4 phase and ground distance elements must be enabled, configured
and set per rules of distance relaying.
If used by this scheme, the selected ground directional overcurrent function(s) must be enabled, configured and set accord-
ingly.
The scheme generates output operands (BLOCKING SCHEME TX INIT and BLOCKING SCHEME TX STOP) that are
used control the transmission of signals to the remote end. Choices of communications channel include Remote Inputs/
Outputs and telecommunications interfaces. When used with telecommunications facilities the output operand should be
assigned to operate an output contact connected to key the transmitter at the interface.
A blocking scheme may be preferred over a Hybrid POTT scheme, because of shorter reach settings for the Zone 2 ele-
ments. This follows from the fundamental difference that all zone 2 elements are required to see an internal fault for the
POTT approach, under all system conditions, which in turn, means that the reversed Zone 4 block initiate elements must
also have an increased reach. A blocking scheme on the other hand, can have much shorter Zone 2 reach settings if
sequential clearance can be accepted. The simple rule to ensure that all faults can be cleared, is for each terminal to have
a reach setting equal to the distance to the tap plus twice the distance from the tap to the remote terminal.
The Zone 2 element must have a coordinating timer
BLOCK RX CO-ORD PKP DELAY
, to ensure that the blocking signal is
received for all external faults that are within the set reach of the local overreaching Zone 2.
Transient blocking logic is implemented via the
TRANS BLOCK
timer, which continues to send a blocking signal for a settable
time
TRANS BLOCK RESET DELAY
, if it was being sent for at least 30 ms during the initial reverse fault set via
TRANS BLOCK
PICKUP DELAY
.
The output operand from the scheme (BLOCKING SCHEME OP) must be configured to interface with other relay functions,
output contacts in particular, in order to make the scheme fully operational. Typically, the output operand should be pro-
grammed to initiate a trip, breaker fail, and auto-reclose, and drive a user-programmable LED as per user application.
Содержание D60
Страница 61: ...GE Multilin D60 Line Distance Protection System 2 31 2 PRODUCT DESCRIPTION 2 3 SPECIFICATIONS 2 ...
Страница 62: ...2 32 D60 Line Distance Protection System GE Multilin 2 3 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Страница 102: ...3 40 D60 Line Distance Protection System GE Multilin 3 3 DIRECT INPUT AND OUTPUT COMMUNICATIONS 3 HARDWARE 3 ...
Страница 134: ...4 32 D60 Line Distance Protection System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 508: ...5 374 D60 Line Distance Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Страница 538: ...6 30 D60 Line Distance Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Страница 610: ...10 8 D60 Line Distance Protection System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Страница 622: ...A 12 D60 Line Distance Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 745: ...GE Multilin D60 Line Distance Protection System B 123 APPENDIX B B 4 MEMORY MAPPING B ...
Страница 746: ...B 124 D60 Line Distance Protection System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 776: ...C 30 D60 Line Distance Protection System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 792: ...E 10 D60 Line Distance Protection System GE Multilin E 1 IEC 60870 5 104 PROTOCOL APPENDIX E E ...
Страница 804: ...F 12 D60 Line Distance Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Страница 826: ...xii D60 Line Distance Protection System GE Multilin INDEX ...