GE Multilin
D60 Line Distance Protection System
5-327
5 SETTINGS
5.7 CONTROL ELEMENTS
5
•
LINE END OPEN PICKUP DELAY:
This setting defines the pickup value for validation of the line end open conditions
as detected by the Line Pickup logic through the
LINE PICKUP LEO PKP
FlexLogic operand. The validated line end open
condition is a requirement for the POTT scheme to return a received echo signal (if the echo feature is enabled). This
value should take into account the principle of operation and settings of the Line Pickup element.
•
POTT SEAL-IN DELAY:
The output FlexLogic operand (
POTT OP
) is produced according to the POTT scheme logic. A
seal-in time delay is applied to this operand for coping with noisy communication channels. The
POTT SEAL-IN DELAY
defines a minimum guaranteed duration of the
POTT OP
pulse. As this operand activates the trip table of the POTT
scheme, the trip operands
POTT TRIP A
,
B
,
C
and
3P
are sealed-in for the same period of time.
•
GND DIR O/C FWD:
This setting defines the FlexLogic operand (if any) of a protection element that is used in addition
to the Zone 2 for identifying faults on the protected line, and thus, for keying the communication channel and initiating
operation of the scheme. Good directional integrity is the key requirement for an over-reaching forward-looking protec-
tion element used as
GND DIR O/C FWD
. Even though any FlexLogic operand could be used as
GND DIR O/C FWD
allow-
ing the user to combine responses of various protection elements, or to apply extra conditions through FlexLogic
equations, this extra signal is primarily meant to be the output operand from either the negative-sequence directional
overcurrent or neutral directional overcurrent. Both of these elements have separate forward (
FWD
) and reverse (
REV
)
output operands. The forward indication should be used (
NEG SEQ DIR OC1 FWD
or
NEUTRAL DIR OC1 FWD
). For greater
security and to overcome spurious directional element operation during transients, adding at least 0.5 cycles of pickup
delay to the forward directional element is recommended.
•
POTT NO OF COMM BITS:
This setting specifies the number of bits of the communications channel available for the
scheme. The transmit codes and trip tables of the POTT scheme are the same as those for the permissive under-
reaching transfer trip scheme. Please refer to the description of the PUTT scheme for more information.
•
POTT RX1 through POTT RX4:
These settings allow the user to select the FlexLogic operands that represent the
receive signals for the scheme. Typically input contacts interfacing with a signaling system are used. In single-bit appli-
cations,
POTT RX1
must be used. In two-bit applications,
POTT RX1
and
POTT RX2
must be used. In four-bit applications,
POTT RX1
,
POTT RX2
,
POTT RX3
, and
POTT RX4
must be used.
Содержание D60
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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 ...