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Overview diagram – 2×D8D, 6-pulse, external charging and
￭
pre-magnetizing
The diagram shows a supply unit with two D8D modules in a 6-pulse connection. The
system has an external charging circuit combined with a transformer pre-magnetization
circuit. For more information, contact ABB.
*)
Note:
Each module must have its own input AC cable with the minimum length of 5 meters. Use
symmetrical supply cabling to ensure equal current sharing between parallel diode bridges.
A
External installation (outside supply module cubicle)
B
Supply module cubicle
1
Medium voltage/low voltage switchboard
2
Switchgear including:
• Disconnecting device
• Breaker/contactor
3
Combined transformer pre-magnetizing circuit and drive charging circuit
4
Supply transformer
5
Overcurrent and short-circuit protection of input cabling
6
AC fuses for protecting supply unit against short circuit
7
Diode supply modules
8
DC link
1)
Available through ABB or third party
2)
Available through ABB
Operation principle and hardware description 23
2)
1)
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