permissive tripping at the local end. This blocking condition is maintained long
enough to ensure that no unwanted operation will occur as a result of the current
reversal.
On verification of a weak end infeed condition, the weak end infeed logic provides
an output for sending the received teleprotection signal back to the remote sending
end and other output(s) for local tripping. For terminals equipped for single- and
two-pole tripping, outputs for the faulted phase(s) are provided. Undervoltage
detectors are used to detect the faulted phase(s).
13.2.3 Function block
SEMOD53507-9 v6
IEC06000287-2-en.vsd
ZCRWPSCH
U3P*
BLOCK
IRVBLK
IRV
WEIBLK1
WEIBLK2
VTSZ
CBOPEN
CRL
IRVL
TRWEI
TRWEIL1
TRWEIL2
TRWEIL3
ECHO
IEC06000287 V2 EN-US
Figure 200: ZCRWPSCH function block
13.2.4 Signals
PID-3521-INPUTSIGNALS v8
Table 230: ZCRWPSCH Input signals
Name
Type Default Description
U3P GROUP
SIGNAL
- Group signal for voltage input
BLOCK BOOLEAN 0 Block of function
IRVBLK BOOLEAN 0 Block of current reversal function
IRV BOOLEAN 0 Activation of current reversal logic
WEIBLK1 BOOLEAN 0 Block of WEI logic
WEIBLK2 BOOLEAN 0 Block of WEI logic due to operation of other
protections
VTSZ BOOLEAN 0 Block of trip from WEI logic through fuse-failure
function
CBOPEN BOOLEAN 0 Block of trip from WEI logic by an open breaker
CRL BOOLEAN 0 POR Carrier receive for WEI logic
Section 13 1MRK 505 394-UEN A
Scheme communication
410 Line differential protection RED650 2.2 IEC
Technical manual
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