Siemens SIPROTEC 7SJ62 Manual page 90

Functions
2.2 Overcurrent Protection 50, 51, 50N, 51N
Note
For an interaction between the automatic reclosing function (79 AR) and the control function, an extended CFC
logic is necessary. See margin heading „Close command: Directly or via Control" in the Setting Notes of the
automatic reclosing function (Section 2.14.6).
Interaction with the Automatic Reclosing Function (phases)
When reclosing occurs, it is desirable to have high-speed protection against faults with 50-2 or 50-3. If the fault
still exists after the first reclosing, the 50-1 or 51 elements will be initiated with graded tripping times, that is,
element 50-2 or 50-3 will be blocked. At address 1214 50-2 active or 1216 50-3 active it can be spec-
ified whether the 50-2 or the 50-3 element should be influenced by the status of an internal or external auto-
matic reclosing system. The setting with 79 active means that the 50-2 or 50-3 elements will only be re-
leased if automatic reclosing is not blocked. If this is not desired, choose the setting Always so that the 50-2
or 50-3 elements will always be active.
The integrated automatic reclosing function of 7SJ62/64 also provides the option to individually determine for
each overcurrent element whether tripping or blocking is to be carried out instantaneously, unaffected by the
AR with the set time delay (see Section 2.14).
Interaction with the Automatic Reclosing Function (ground)
When reclosing occurs, it is desirable to have high-speed protection against faults with 50N-2 or 50N-3. If the
fault still exists after the first reclosing, the 50N-1 or 51N elements or will be initiated with graded tripping times,
that is, element 50N-2 or 50N-3 will be blocked. At address 1314 50N-2 active or 1316 50N-3 active it
can be specified whether the 50N-2 or the 50N-3 element should be influenced by the status of an internal or
external automatic reclosing system. Address with 79 active determines that the 50N-2 or 50N-3 elements
will only operate if automatic reclosing is not blocked. If this is not desired, select the setting Always so that
the 50N-2 or 50N-3 elements will always operate, as configured.
The integrated automatic reclosing function of 7SJ62/64 also provides the option to individually determine for
each overcurrent element whether tripping or blocking is to be carried out instantaneously, unaffected by the
AR with the set time delay (see Section 2.14).
90
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008