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) function.
12.4.3 Function block
M13924-3 v5
IEC06000288-2-en.vsd
ECPSCH
BLOCK
BLKTR
BLKCS
CSBLK
CACC
CSOR
CSUR
CR
CRG
TRIP
CS
CRL
LCG
IEC06000288 V2 EN-US
Figure 231: ECPSCH function block
12.4.4 Signals
PID-3581-INPUTSIGNALS v7
Table 264: ECPSCH Input signals
Name
Type Default Description
BLOCK BOOLEAN 0 Block of function
BLKTR BOOLEAN 0 Signal for blocking trip due to communication
logic
BLKCS BOOLEAN 0 Signal for blocking CS in Overreach and Blocking
schemes
CSBLK BOOLEAN 0 Reverse residual overcurrent signal for Carrier
Send
CACC BOOLEAN 0 Signal to be used for tripping by Communication
Scheme
CSOR BOOLEAN 0 Overreaching residual overcurrent signal for
Carrier Send
CSUR BOOLEAN 0 Underreaching residual overcurrent signal for
Carrier Send
CR BOOLEAN 0 Carrier Receive for Communication Scheme
Logic
CRG BOOLEAN 0 Carrier guard signal received
Section 12 1MRK 506 382-UEN A
Scheme communication
450 Line distance protection REL650 2.2 IEC
Technical manual
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