7.9 Inhibit conditions before synchronising mains breaker
This function is used to inhibit the synchronising of the mains breaker after blackout. After blackout, the timer
in menu 2291 ("Delay activate recovery 2") will start to run, and if the mains voltage and frequency are inside
the limits (2281/2282/2283/2284) before the timer runs out, the short interruption timer (menu 2292 "Recovery
del. 1") will be started. When the timer has run out, the synchronising of the MB will start.
If the "Delay activate recovery 2" timer runs out, the long interruption timer (menu 2294 "Recovery del. 2") will
start to run.
Examples:
Recovery timer 1 (short interruption timer)
Menu 2291 = 3 s
Menu 2292 = 5 s
That means: if the short interruption timer is set to < 3 s, and the grid is back and voltage and frequency are
inside the acceptable range stated above, then after 5 s the MB can be closed.
GPC-3 DRH 4189340587 UK
Synchronisation
DEIF A/S Page 121 of 122
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