10
AUTOM ATIC CONTROL U N ITS , OM D20 0 A N D 3 0 0
Ts: Switching delay, Tbs: Back switching delay, Gs: Generator stop delay
Figure 3.2
Automatic Switching Sequence, no line priority
—
3.1.2
No line priority
The switching sequence can be summarized in following steps:
An anomaly occurs on the Line 1
Switching delay
Generator start
Change-over switch (Switch I) to the position O
Change-over switch (Switch II) to the position II
And the back switching sequence can be summarized in the following steps:
The Line 1 will start the normal functioning
Change-over switch stays in position II
An anomaly occurs on the Line 2
Back switching delay
Change-over switch (Switch II) to the position O
Change-over switch (Switch I) to the position I
Generator stop delay
Generator stop
LINE 1
LINE 2
Switch I status
Switch II status
Gen. start
Ts
Tbs
Gs
A0
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