Siemens SIPROTEC 4 7VK61 - Page 73

[logikdiagramm-endfehlerschutz-wlk-310702, 1, en_GB]
Figure 2-19
Logic diagram of stub fault protection
1) The output indications associated with the pickup signals can be found in Table 2-3
2) The output indications associated with the trip signals can be found in Table 2-4
Instantaneous tripping before automatic reclosure
If automatic reclosure is to be carried out, quick fault clearance before reclosure is usually desirable. A release
signal from an external automatic reclosure device can be injected via binary input
>O/C InstTRIP . The
interconnection of the internal automatic reclose function is performed via an additional CFC logic, which typi-
cally connects the output signal 2889
AR 1.CycZoneRel with the input signal >O/C InstTRIP . Any stage
of the overcurrent protection can thus perform an instantaneous trip before reclosure via the parameter
Telep / BI ....
Switching onto a fault
To achieve fast tripping of the circuit breaker in the event of an earth fault, the manual CLOSE detection func-
tion can be used. The time overcurrent protection can then trip three-pole without delay or with a reduced
delay. It can be determined via parameter settings for which stage(s) the instantaneous tripping following
energization applies (see also the logic diagrams Figure 2-16, Figure 2-17 and Figure 2-19).
Functions
2.3 Overcurrent protection (optional)
SIPROTEC 4, 7VK61, Manual 73
C53000-G1176-C159-5, Edition 05.2018