5
AU TO M AT I C T R A N SFER S W I TC H , OT M _ C _ 2 1 D
And the return sequence can be summarized in
the following steps:
•
The Line 1 will start the normal functioning
•
Return delay TBs
•
Change-over switch (Switch II) to the position 0
•
Change-over switch (Switch I) to the position I
•
Generator stop delay Gs
•
Generator stop
Figure 2. Automatic Switching Sequences in OTM_C_21D, Line 1 priority
The transfer sequence of OTM_C21D can be sum-
marized in following steps:
•
An anomaly occurs on the Line 1 (LN1)
•
Generator start, immediately start generator in
case of black-out, phase-loss, overvoltage or
undervoltage (If Generator mode is selected)
•
The Line 2 start the normal functioning,
transfer delay Ts
•
Change-over switch (Switch I) to the position 0
•
Change-over switch (Switch II) to the position II
—
2.2 OTM_C21D switching sequence
2.2.1 Line 1 Priority (default mode)
