Siemens siprotec SJ62 User Manual page 141

2 Functions
139
Figure 2-45 Typical fault profile for load side connection of the voltage transformers (with
current supervision)
Following closing of the circuit breaker, current supervision BkrClosed I MIN is
delayed for a short period of time. If voltage criterion drops out during this time period
(about 60 ms), the protection function will not pick up. Thereby no fault record is gen-
erated when closing the CB in a healthy system. It is important to understand, howev-
er, that if a low voltage condition exists on the load after the circuit breaker is closed
(unlike Figure 2-45), the desired pickup of the element will be delayed by 60 ms.
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015