Siemens SIPROTEC 4 User Manual page 64

Functions
2.2 Overcurrent Protection 50, 51, 50N, 51N
[7sj6x-abhueberstromzeit-phase-20061212, 1, en_US]
Figure 2-11
If an ANSI characteristic is configured, parameter 1209 51 TIME DIAL is used instead of parameter 1208 51
TIME DIAL.
If parameter MANUAL CLOSE is set to 51 instant. and manual close detection applies, the trip is initiated
as soon as the pickup conditions arrive, even if the element is blocked via a binary input.
The same applies to 79 AR 51N inst.
64
Logic diagram of the inverse-time overcurrent protection element for phases
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016