Siemens siprotec SJ62 User Manual page 268

SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
• Inrush restraint:
Direct interaction with the inrush restraint is not possible. In order to block a flexible
function by the inrush restraint, the blocking must be carried out in CFC. The flexible
function provides three binary inputs for blocking trip commands selectively for each
phase (no. 235.2115 to 235.2117). They have to be linked with the phase-selective
indications for detecting the inrush (no. 1840 to 1842). Activating a crossblock func-
tion requires the phase-selective inrush indications to be logically combined with
the binary input for blocking the function trip command (no. 235.2114 „>$00
BLK.TRIP"). The flexible function also needs to be delayed by at least 20 ms to
make sure that the inrush restraint picks up before the flexible function.
• Entire relay logic:
The pickup signal of the flexible function is added to the general device pickup, the
trip signal is added to the general device trip (see also Chapter 2.22). All functions
associated with general device pickup and tripping are thus also applied to the flex-
ible function.
After the picked up element has dropped out, the trip signals of the flexible protec-
tion functions are held up at least for the specified minimum trip command time 210
T TRIPCOM MIN.
2.17 Flexible Protection Functions (7SJ64 only)
266