Variable transformers put inverters to the test
A
REO product story
Edited by the Engineeringtalk editorial team
May 15, 2006
Motorised 150kVA variable transformers are employed in both development and production of multiphase inverters for the international military and commercial marine markets.
Modular multiphase inverters developed specifically for the international military and commercial marine markets by ConverTeam of Rugby (formerly Alstom Power Conversion) are subject to continual development to ensure maximum control and efficiency.
Called the VDM25000 convertor, they provide PWM control for 15-phase marine propulsion motors.
Helping to achieve this are two motorised 150kVA variable transformers supplied by REO UK, which are employed both at the development and production stages for the VDM25000.
At the ConverTeam's Rugby plant, one of the REO transformers is used to provide a variable three-phase power supply (0-4160V) to reproduce different supply/load conditions.
This enables the company to prove new IGBTs as they are introduced by equipment manufacturers as part of an ongoing test and development programme.
REO's motorised transformer, which provides more effective supply control than an earlier manually operated unit, is connected to a channel simulation unit.
As in a real duty onboard situation, the three-phase AC supply is converted by the simulation unit into a nominal 5300V DC.
During tests, this load is dumped to a 700A oil cooled reactor.
The second REO transformer is installed at ConverTeam's Glasgow site for testing assembled convertors.
ConverTeam's VDM25000 has three channels each feeding five of the 15 phases to the propulsion induction motor, an arrangement that allows parallel redundancy at lower capability levels.
Each phase is driven with an H-bridge to maximise output capability and gain net improvements in signature and efficiency.
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