Siemens SIPROTEC 7UT613 series Manual page 264

2 Functions
Figure 2-106 Logic diagram of frequency protection
264
Maintaining the pickup is ended if the frequency measurement reads again frequen-
cies <66 Hz (or <22 Hz) or the frequency protection is blocked via the indication
>FQS. Each frequency stage has a set delay time.
Each of the four frequency elements can be blocked individually by binary inputs. The
entire frequency protection can be blocked via a binary input. A corresponding
command is signalled after the delay time.
7UT613/63x Manual
C53000-G1176-C160-2