Chapter 2 - Twelve-Pulse Technology; Definition Of 12 - Pulse Technology; Types Of 12 - Pulse Configurations; Pulse Parallel Configuration - ABB DCS 600 MultiDrive Series Manual

Definition of 12 – pulse
technology
Advantages of
12 – pulse technology
2.1 Types of 12 – pulse configurations
12 – pulse parallel
configuration
DCS 600 Manual for 12 – Pulse Operation
Chapter 2 – Twelve–Pulse Technology
The characteristic features of the 12 – pulse technology are:
•
a DC drive comprising two 6 – pulse thyristor converters;
•
a 12 – pulse line transformer providing the AC power for both
converters from separated transformer secondary windings
whose phase positions differ by 30°. An example for such a
transformer configuration is ∆ /
The most significant advantages of 12 – pulse technology are:
•
Reduced level of harmonics on the AC side for 12 – pulse
parallel and serial configurations
Configuration
6 – pulse
12 – pulse
•
Extension of the power range by doubling the converter out-
⇒
put current (
•
Possibility of an emergency operation with one converter in
case of a breakdown in the other converter.
•
Improvement of the motor efficiency due to reduced DC cur-
rent ripple.
ABB offers different types of 12 – pulse configurations:
In this
12 – pulse parallel
the DC current of two converters. Thus the current is doubled.
An emergency operation is possible with full armature voltage and
with 50 % of the former maximum torque.
98T Ã% 
!ƒˆy†rÃH 6 T U@ S Ã
D1
*) For 4-Q drives
two DC breakers
are recommended
/ ∆ .
Harmonics
5th; 7th; 11th; 13th; 17th; 19th; 23rd; 25th; ..
11th; 13th;
parallel config.) or voltage (
configuration the motor gets the sum of
∆
!ƒˆy†rÃh…hyyryÃ
p‚svtˆ…h‡v‚
C1
C1
*)
T-REACTOR
Field
0
23rd; 25th; ..
⇒
serial config.).
98T Ã% 
!ƒˆy†rÃT G6 W @
D1
*)
Figure 2/1
II F2
2 - 1