LDCM” and the “Binary signal transfer to remote end” function. It is also possible to include, in
an easy way (by means of configuration possibilities), the complete functionality into regular
scheme communication logic for the distance protection function. The communication
scheme for the regular distance protection does not operate during the power-swing
conditions, because the distance protection zones included in the scheme are normally
blocked. The powerswing zones can for this reason use the same communication facilities
during the power-swing conditions.
Only one power swing zone is necessary in distance protection at each line terminal, if the
POTT communication scheme is applied. One underreaching power swing zone, which sends
the time delayed carrier signal, and one overreaching power swing zone, which performs the
local tripping condition, are necessary with PUTT schemes.
The operation of the distance protection zones with long time delay (for example, zone 3) is in
many cases not blocked by the power swing detection elements. This allows in such cases the
distance protection zone 3 (together with the full-scheme design of the distance protection
function) to be used at the same time as the overreaching power-swing zone.
STDEF
AR1P1
&
STPSD
BLOCK
&
t
tCS
&
CSUR
CS
t
tBlkTr
&
t
tTrip
CR
CACC
>1
&
BLKZMPS
TRIP
en06000236.vsd
IEC06000236 V1 EN-US
Figure 244: Simplified logic diagram - power swing communication and tripping logic
Configuration
SEMOD131360-17 v2
Configure the BLOCK input to any combination of conditions, which are supposed to block the
operation of logic. Connection to detected fuse failure conditions is required as a minimum.
The STDEF functional input should be configured to the START signal of any line earth fault
overcurrent protection function within the IED. When the directional earth fault O/C function
is used an OR combination of forward and reverse operation should be used.
Connect the AR1P1 to the output signal of the autoreclosing function, which signals the
activation of the single pole autoreclosing dead time.
The STPSD input should be connected to the starting signal of the power swing detection
(ZMRPSB) function, which becomes active in cases of detected system oscillations.
The CSUR functional input should be connected to the starting output of the power swing
distance protection zone, which is used as a local tripping criteria during power swings in
PUTT schemes. When the POTT scheme is used (also on series compensated networks) the
local criteria and the carrier sending zone are one and the same. It is preferred to use separate
communication facilities for distance protection and for power swing communication logic,
but combination of functionality within the same communication channel is possible as well.
Section 7
1MRK 505 343-UEN B
Impedance protection
374
Application manual
Содержание Relion 670 series
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