3.1 Overview 30
3.2 Drive topology 31
3.3 Power supply configurations 32
3.3.1 Main power supply configurations 33
3.3.2 Auxiliary power supply configurations 33
3.4 Drive topology 33
3.4.1 Overview 34
3.4.2 Control compartment and terminal
compartment 35
3.4.3 Rectifier and inverter compartment 36
3.4.4 Grounding switch 37
3.4.5 Rectifier 37
3.4.6 Protection IGCTs 37
3.4.7 Inverter 38
3.4.8 Filter 38
3.4.9 Optional Braking Chopper 38
3.5 Cooling system 42
3.5.1 Fan configurations 42
3.5.2 Type of fan 42
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