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

Chapter 2 – Twelve–Pulse Technology
DCS 600 Manual for 12 – Pulse Operation II F2 2 - 1
Definition of 12 – 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 ∆ / / ∆ .
Advantages of
12 – pulse technology
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 Harmonics
6 – pulse 5th; 7th; 11th; 13th; 17th; 19th; 23rd; 25th; ..
12 – pulse 11th; 13th; 23rd; 25th; ..
• Extension of the power range by doubling the converter out-
put current (
⇒ parallel config.) or voltage (⇒ serial config.).
• 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.
2.1 Types of 12 – pulse configurations
ABB offers different types of 12 – pulse configurations:
12 – pulse parallel
configuration
In this
12 – pulse parallel configuration the motor gets the sum of
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.
SXOVH0$67(5
SXOVH6/$ 9(
C1D1
C1 D1
∆
<
T-REACTOR
SXOVHSDUDOOHO
FRQILJXUDWLRQ
Field
'&6 '&6
0
*) For 4-Q drives
two DC breakers
are recommended
*)*)
Figure 2/1