AET-HV High Voltage frequency inverter (AC Drives, Variable frequency drive,  adjustable frequency drive)

Our high voltage(HV) frequency inverter (adjustable frequency drives) are widely applied in the following areas:

Heat power station: coal grinding machine, blower, draught fan, dust exhaust fan, circulating pump and water-feeding pump.

Iron and steel plant, metallurgical plant: water-feeding pump, dust exhaust fan, draught fan, oxygenator.

Mine: slurry pump, ventilator.

Oil: water injection pump, oil pump.

Chemical plant: compressor, blower, circulating pump.

draw off pump, supply pump, purifying pump, sewage pump in urban power supply and sewage disposal.

The grinder, pump, draught fan, dust fan, supply blower in cement plant, and ceramic plant.

others: the blower for medicine, paper making, food.

Voltage of this medium voltage frequency inverter: 3kV, 3.3kv, 6kv, 6.6kv, 10kV, 11kv, or more  Single unit power of our high voltage ac drive: 315kW - 8000kW

Common feature:
Adopt A-D-AD high voltage way controlled by space voltage vector in sine wave PWM technology, transformer isolation and in-line power element.
Input end adopts move phase transformer multiple-rization technology, electric current harmonic input is minor;
Output end adopt n power-unit cascade to fold up wave technology, output voltage wave form approaches sine, electric current wave form is perfect;
Input and output harmonic waves all completely meet the standard
IEEE Std 519-1992 and GB/T14549-2002.
No need set power factor repair equipment. The power factor of regular variable speed range is higher than 0.97.
No need set I/O filter
No peculiar request to the driven electric motor
System overall efficiency is higher than 96%
Friendly user interface
WINDOWS operation system platform, large screen and real color LCD display, touch screen direct operating, quick and convenient function parameter setting, and preserving up to 20 sets of parameter settings. Automatically record the all information in every operation, and can be referred on-line anytime.
Flexible control mode
Local control by the touch screen; remote control by inside PLC I/O gate; Superordination control by RS485 interface and DCS system linking.
Pre-charging circuit ensures the system with shock-free starting, apply to any low capacity electricity network and ancillary equipment.
Control two power supplies to maximally ensure normal running.
Perfect self-diagnosing functions can online monitor system state. Automatically take suitable protective measures and record running parameters in malfunction.
The power element automation bypass function may cut the malfunction element and ensure symmetry and balance of the three-phase output voltage and output electric current. Maximally reduce motor stopping rate to ensure non-stop working in breakdown state.
Supply the inverters perfect diagnose and strong treatment ability to various protection at input and output ends, voltage and electric current and temperature etc.
No-perturbation function can be used to realize frequency conversion. Motor can automatically change to frequency transformer in case the inverters is with bad failure, to ensure the machine run regularly in system breakdown.


AET-HV High Voltage frequency converter (variable frequency ac drive, adjustable speed drive, VFD, variable speed drives )'s main electric circuit principle:

AET-HV High Voltage frequency changer (variable frequency ac drive, adjustable speed drive, VFD, variable frequency drives )'s bypass structural

AET-HV Medium voltage High Voltage frequency converter (variable speed ac drives)'s diagram: