Auxilliary converter forms part of the auxiliary drive system in the ac locomotive which is primarily used for supplying power to loads such as fans, blowers, lighting the cabin and also charging the locomotive battery. Its typically of IGBT configuration and is fed from the auxiliary winding of the locomotive transformer.
Auxilliary converter forms part of the auxiliary drive system in the ac locomotive which is primarily used for supplying power to loads such as fans, blowers, lighting the cabin and also charging the locomotive battery. Its typically of IGBT configuration and is fed from the auxiliary winding of the locomotive transformer.
In older traction systems, Arno converters were in use to convert the single phase into three phase supply. The three phase supply thus obtained was having phase as well as magnitude unbalances. It was used to feed three phase power to auxiliary motors in compressor used in raising or lowering the pantograph, cooling fans and other requirements. These motors were specially designed motors to give best performance with the known unbalanced supply.
The Arno converters was in fact the three phase squirrel cage induction motor started on single phase supply without any mechanical load. The open phase developed the one of the phase due to cutting of rotating magnetic fields.
Due to advent of solid state devices, the Arno converters in traction locomotives have been replaced by solid state single phase to three phase converter which is used to run three phase auxiliary motors on board of the locomotives.
This System converts single phase power from Locomotive Transformer to three phase 50Hz power to supply to all auxiliary loads of Electric locomotive. It is direct replacement of Single phase to three phases ARNO Converter.
Single Phase to Three Phase 180KVA Static Converter will take Single Phase Supply from the Locomotive main transformer tertiary winding and will use a Rectifier to derive a stable DC link voltage and unity power factor at input stage. The DC Link is unaffected by supply voltage variations. This DC link will be used as input to the three - phase Inverter, which will utilise IGBTs to synthesise a three-phase Sine Weighted PWM waveforms, with a fundamental voltage of 415 Vrms line to line. Since IGBTs are used as switching devices in the inverter, the system reacts fast to any of the fault conditions and protects itself and loads from all fault conditions. A Battery Charger is also built-in to cater to DC loads and to Charge the battery.
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