- 375 -
Figure 2.31-1 Scheme logic in the CTF function
1
Note: Signal CB_ALLPH_CLOSE is provided from Protection common function
(PROT_COMMON). For more information, see Chapter
Relay application:
Protection common
.
2
Note: Entering signals come from distance protections (ZS/ZG) when the ZS/ZG are
available in the IED. For more information, see Chapter
Relay application:
Distance protection
.
3
Note: Output signals are provided for respective relays when the relays are available.
See
Appendix: Ordering
whether the relays are supplied into the IED.
4
Note: AMF feature is used for the test. To generate the AMF signal, see chapter
User
interface: test-submenu
.
If a PLC signal is injected at the PLC connection point “CTF_BLOCK”, the operation of
the CTF function is blocked. The user can program to inject an external signal for the failure
detection using the PLC connection point EXTERNAL_CTF; the CTF_DETECT signal is
generated when the signal is injected at the EXTERNAL_CTF.