Harmonics supprenssion and power factor/comprehensive efficiency improving
Energy saving by SC7
SC7 series is harmonics suppression converter to conect inverter drive equipment.
SC7 control input voltage and input current to same phase (power factor=1) for harmonics suppression.
Therefore, to use this SC7 will be energy saving by harmonics suppression and power factor/comprehensive efficiency.
Outline of comprehensive efficiency improving
|Power supply equipment efficiency||Improving by power factor=1 control.|
|Capacity of breaker
|Reducing capacity of wiring apparatus by decreasing motor current and input current.|
|Inverter efficiency||Improving by inverter's inside loss; Rectifier loss is nothing.|
|Motor driving voltage||Keep the motor driving voltage to high level without voltgae drop as rector.|
|Motor efficiency||Improving by decreasing motor current for high motor driving voltage.|
- Comparison of needed input capacity:
Input Capacity = (1.732*Vout*Iout)/(eff1 * cosX)
Input Capacity = (1.732*Vout*Iout)/eff2
Vout: Inverter's output voltage
Iout: Inverter's output current
eff1: Inverter's efficiency
eff2: Inverter and SC7 efficiency
cosX: Inverter's input power factor
Inverter's input power factor:
Reactor installing: about 0.8
Interter's input power factor depends on capacity of power supply and impedance of wiring.
- In case of driving 160kW motor (440V-250A)
|Condition||Inverter/Converter efficiency||Total power factor||Necessary input Capacity|
|Inverter with DC choke||0.96||0.8||248.1 kVA|
|Inverter with SC7||0.98 x 0.98 = 0.96||1||198.5 kVA|
|Condition||Input current||Cable size||MCCB flame||Selected transformer capacity|
|Inverter with DC choke||253 A||100 mm2||400 AF||300 kVA|
|Inverter with SC7||194 A||60 mm2||300 AF||200 kVA|