[schutzstufensteuerung-bei-zweimaliger-erfolgreicher-awe-260602-kn, 1, en_US]
Figure 2-92
Control of protection elements for two-fold, successful automatic 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
operation. If the fault prevails, a second tripping is to take place instantaneously and subsequently, a second
reclosing.
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 and 7203 bef.1.Cy:50N-2 und 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).
The blocking applies only after reclosure in accordance with the set address. Hence, it is possible to specify
again other conditions for a third reclosure.
Functions
2.15 Automatic Reclosing System 79
SIPROTEC 4, 7SJ80, Manual 217
E50417-G1140-C343-A8, Edition 12.2017
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