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Functions
2.14 Automatic Reclosing System 79
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
259
Figure 2-97
Control of protection elements for two-fold, successful auto-reclosure
Example:
Before the first reclosing, faults are to be eliminated quickly applying elements 50-2 or 50N-2. Fast fault termi-
nation thus has priority over selectivity aspects as the reclosing action aims at maintaining normal system op-
eration. If the fault prevails, a second tripping is to take place instantaneously and subsequently, a second re-
closing.
After the second reclosing, however, elements 50-2 or 50N-2 are to be blocked so the fault can be eliminated
by applying elements 50-1 or 50N-1 according to the grading coordination chart of the system giving priority to
selectivity concerns.
Addresses
7202
bef.1.Cy:50-2
,
7214
bef.2.Cy:50-2
,
7203
bef.1.Cy:50N-2
and
7215
bef.2.Cy:50N-2
are set to
instant. T=0
to enable the elements after the first reclosing. Addresses
7226
bef.3.Cy:50-2
and
7227
bef.3.Cy:50N-2
, however, are set to
blocked T=
∞
, to ensure that elements
50-2 and 50N-2 are blocked when the second reclosing applies. The back-up elements, e.g. 50-1 and 50N-1,
must obviously not be blocked (addresses
7200
,
7201
,
7212
,
7213
,
7224
and
7225
).
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