9
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
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3 Description
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3.1
OMD200 and OMD300 switching sequence
3.1.1
Line 1 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
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
Ts: Switching delay, Tbs: Back switching delay, Gs: Generator stop delay
Figure 3.1
Automatic Switching Sequence, Line 1 priority
LINE 2
LINE 1
Switch I status
Switch I status
Gen. START
A0
7243
Tbs
Ts
Gs
