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2-2 Principles
2-2-1 Main circuit
The typical circuit topological structure diagram of MVF2000 Medium Voltage Drive
series is as shown in Fig. 2-9.
The phase-shift rectifier transformer is a three-phase air-cooled dry-type transformer
directly connected with the incoming high voltage, whereas the secondary windings use
extended delta connection, which can lower the content of the input side current distortion.
The phase-shift angle between the secondary windings can be calculated according to the
following formula:
The secondary windings of the transformer provide input power for each power cell
respectively. The amount of secondary windings and the phase-shift angle between the
windings are determined according to the voltage level and structure of the MVD, as shown in
Table 2-1.
Table 2-1 Power cell configuration table of MVF2000 medium voltage drive
MVD series
3.3kV
6.6kV
11kV
Fig. 2-9 Topological structure diagram
Phase
shift
angle
Number of power
System cell
cells per phase
3
6
9
60
Number
of
power
cells
Output phase
number
voltage
9
1905V
18
3810V
27
6351V
19
Output line voltage
3300V
6600V
11000V
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