13.2.2.2
Permissive underreach scheme
In a permissive underreach scheme, a forward directed underreach measuring element
(normally zone1) sends a permissive signal CSLx to the remote end if a fault is
detected in forward direction. The received signal CRLx is used to allow an
overreaching zone (connected to CACCLx) to trip after the
tCoord
timer has elapsed.
The
tCoord
is in permissive underreach schemes normally set to zero. The logic for
trip carrier in permissive scheme is shown in figure
. Three channels for
communication in each direction must be available.
CACCLx
CRLx
AND
ANSI07000088_2_en.vsd
TRLx
0
0
25 ms
0-
tCoord
ANSI07000088 V2 EN
Figure 392:
Basic logic for trip carrier in one phase of a permissive underreach
scheme
13.2.2.3
Permissive overreach scheme
In a permissive overreach scheme, a forward directed overreach measuring element
(normally zone2) sends a permissive signal CSLx to the remote end if a fault is
detected in forward direction. The received signal CRLx is used to allow an
overreaching zone to trip after the settable
tCoord
timer has elapsed. The
tCoord
is in
permissive overreach schemes normally set to zero. The logic for trip carrier is the
same as for permissive underreach, see figure
The permissive overreach scheme has the same blocking possibilities as mentioned for
blocking scheme above. The blocking inputs are activated from the current reversal
logic when this function is included.
Three channels for communication in each direction must be available.
13.2.2.4
Unblocking scheme
In an unblocking scheme, the lower dependability in permissive scheme is overcome
by using the loss of guard signal from the communication equipment to locally create a
carrier receive signal. It is common or suitable to use the function when older, less
reliable, power-line carrier (PLC) communication is used. As phase segregated
communication schemes uses phases individually and the PLC is typically connected
single-phase or phase-to-phase it is not possible to evaluate which of the phases to
release and the unblocking scheme has thus not been supported.
Section 13
1MRK505222-UUS C
Scheme communication
798
Technical reference manual
Содержание Relion 670 series
Страница 1: ...Relion 670 series Line differential protection RED670 ANSI Technical reference manual...
Страница 2: ......
Страница 40: ...34...
Страница 50: ...44...
Страница 60: ...54...
Страница 126: ...120...
Страница 384: ...378...
Страница 496: ...490...
Страница 556: ...550...
Страница 602: ...596...
Страница 620: ...614...
Страница 794: ...788...
Страница 864: ...858...
Страница 988: ...982...
Страница 998: ...992...
Страница 1084: ...1078...
Страница 1164: ...1158...
Страница 1168: ...1162...
Страница 1170: ...1MRK002802 AB 1 670 1 2 PG ANSI V1 EN Section 21 1MRK505222 UUS C Connection diagrams 1164 Technical reference manual...
Страница 1171: ...1MRK002802 AB 2 670 1 2 PG ANSI V1 EN 1MRK505222 UUS C Section 21 Connection diagrams 1165 Technical reference manual...
Страница 1172: ...1MRK002802 AB 3 670 1 2 PG ANSI V1 EN Section 21 1MRK505222 UUS C Connection diagrams 1166 Technical reference manual...
Страница 1173: ...1MRK002802 AB 4 670 1 2 PG ANSI V1 EN 1MRK505222 UUS C Section 21 Connection diagrams 1167 Technical reference manual...
Страница 1174: ...1MRK002802 AB 5 670 1 2 ANSI V1 EN Section 21 1MRK505222 UUS C Connection diagrams 1168 Technical reference manual...
Страница 1175: ...1MRK002802 AB 6 670 1 2 ANSI V1 EN 1MRK505222 UUS C Section 21 Connection diagrams 1169 Technical reference manual...
Страница 1176: ...1MRK002802 AB 7 670 1 2 ANSI V1 EN Section 21 1MRK505222 UUS C Connection diagrams 1170 Technical reference manual...
Страница 1177: ...1MRK002802 AB 8 670 1 2 ANSI V1 EN 1MRK505222 UUS C Section 21 Connection diagrams 1171 Technical reference manual...
Страница 1178: ...1MRK002802 AB 9 670 1 2 ANSI V1 EN Section 21 1MRK505222 UUS C Connection diagrams 1172 Technical reference manual...
Страница 1179: ...1MRK002802 AB 10 670 1 2 ANSI V1 EN 1MRK505222 UUS C Section 21 Connection diagrams 1173 Technical reference manual...
Страница 1180: ...1MRK002802 AB 11 670 1 2 ANSI V1 EN Section 21 1MRK505222 UUS C Connection diagrams 1174 Technical reference manual...
Страница 1181: ...1MRK002802 AB 12 670 1 2 ANSI V1 EN 1MRK505222 UUS C Section 21 Connection diagrams 1175 Technical reference manual...
Страница 1182: ...1MRK002802 AB 13 670 1 2 ANSI V1 EN Section 21 1MRK505222 UUS C Connection diagrams 1176 Technical reference manual...
Страница 1183: ...1MRK002802 AB 14 670 1 2 ANSI V1 EN 1MRK505222 UUS C Section 21 Connection diagrams 1177 Technical reference manual...
Страница 1184: ...1MRK002802 AB 15 670 1 2 ANSI V1 EN Section 21 1MRK505222 UUS C Connection diagrams 1178 Technical reference manual...
Страница 1220: ...1214...
Страница 1230: ...1224...
Страница 1231: ...1225...