11
AUTOM ATIC CONTROL U N ITS , OM D20 0 A N D 3 0 0
AU TO M AT I C CO N T R O L U N I T S , O M D 2 0 0 -3 0 0
Ts: Switching delay, Tbs: Back switching delay
Figure 3.3
Automatic Switching Sequence, manual back switching mode
—
3.1.3
Manual back switching mode
The switching sequence of OMD200 and OMD300 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
The Line 2 will start the normal functioning
Switching delay
Change-over switch (Switch II) to the position II
LINE 1
LINE 2
Switch I status
Switch II status
Gen. start
Ts
Tbs
Ts
A0
7262
