12.5.2
Functionality
To achieve fast fault clearance of ground faults on the part of the line not covered by the
instantaneous step of the residual overcurrent protection, the directional residual
overcurrent protection can be supported with a logic that uses communication channels.
In the directional scheme, information of the fault current direction must be transmitted to
the other line end. With directional comparison, a short operate time of the protection
including a channel transmission time, can be achieved. This short operate time enables
rapid autoreclosing function after the fault clearance.
The communication logic module for directional residual current protection enables
blocking as well as permissive under/overreaching, and unblocking schemes. The logic
can also be supported by additional logic for weak-end infeed and current reversal,
included in Current reversal and weak-end infeed logic for residual overcurrent protection
ECRWPSCH (85) function.
12.5.3
Function block
ANSI09000009-1-en.vsd
ECPSCH (85)
BLOCK
BLKTR
BLKCS
CS_STOP
PLTR_CRD
CSOR
CSUR
CR
CR_GUARD
TRIP
CS
CRL
LCG
ANSI09000009 V1 EN
Figure 245:
ECPSCH (85) function block
12.5.4
Signals
Table 352:
ECPSCH (85) Input signals
Name
Type
Default
Description
BLOCK
BOOLEAN
0
Block of function
BLKTR
BOOLEAN
0
Block pilot (communication assisted) trip
BLKCS
BOOLEAN
0
Block pilot channel start
CS_STOP
BOOLEAN
0
Block of channel start (CS) due to reverse fault detection
PLTR_CRD
BOOLEAN
0
Signal to be used for coordinating local pilot tripping with
the channel receive (CR) signal
CSOR
BOOLEAN
0
Signal to be used for channel start with overreaching
pilot schemes
Table continues on next page
1MRK 506 335-UUS A
Section 12
Scheme communication
517
Technical manual
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