Danfoss VACON 1000, Operating Manual

Page: 29 / 144

3.4 System Operation
3.4.1 Main Circuit
The typical main circuit topological structure diagram of VACON® 1000 medium-voltage drive is shown in Illustration 24 .
Motor
Phase-shift
Transformer
-12°
-24°
0°
12°
24°
Power Cells
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
≈
Source
e3
0b
i6
54
.1
0
Illustration 24: Main Circuit Diagram of VACON® 1000
The phase-shift rectifier transformer is a 3-phase air-cooled dry-type transformer directly connected with the incoming high voltage.
The secondary windings use an 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:
Phase − shift angle =
60°
Number of power cells
The secondary windings of the transformer provide input power for each power cell respectively. The number of secondary wind-
ings and the phase-shift angle between the windings are determined according to the voltage level and structure of the drive, as
shown in
Table 2 .
Table 2: Power Cell Configuration for VACON® 1000
Drive series Number of power cells per phase System cell number Output phase voltage (V) Output line voltage (V)
2.4 kV 3 9 1385 2400
3 kV 3 9 1732 3000
3.3 kV 3 9 1905 3300
4.16 kV 4 12 2400 4160
6 kV 5 15 3464 6000
AQ363633621020en-000201 / 172F3117 | 29 Danfoss A/S © 2021.06
Product Overview
VACON® 1000
Operating Guide