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Medium Voltage Variable Frequency Drive

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BORNA Electronics Medium Voltage Variable Frequency Drive (MV-VFD)

- Motor soft starting and power factor correction
- Significant reduction of initial project costs
- Significant reduction of motor maintenance costs and mechanical load
- Energy saving
- Special design according to the desired specifications of the costumer
- High reliability
- Suitable for oil and gas industries, petrochemicals, mines, power plants, steel, copper, cement industries, etc
- Direct and immediate after-sales service


The Medium Voltage Variable Frequency Drive (MV-VFD) is one of the latest products of the BORNA Electronics Company as the first producer of this equipment in IRAN. MV-VFDs are used in various industries including oil and gas and petrochemical industries, power, mining and steel industries, etc. All inquiries design case by case according to the special need of customers in voltage range of 3 to 11 kilovolts and power range of 250 to 15.000 kilowatts.

 

Work Principles
The structure of BORNA MV-VFD is one of the most famous and reliable structures in multi-level converters which is called Cascaded H-Bridge (CHB). The user can set the output frequency (motor speed), therefore appropriate output voltage waveform is generated by using the most up-to-date pulse generation algorithm. Using of high technology control system guarantees the minimum distortion of output voltage and current and lowest torque fluctuation.

 

Advantages
High power quality at the input and output of BORNA MV-VFD without the need to use harmonic filters (input and output THD are less than 5%)
•  Automatic bypass of a failed power cell and continue working without trip
•  Mean Time To Repair (MTTR) = 15 min
•  Reducing motor starting current to less than 20% of the rated current
•  Power factor correction to more than 95% (no need for power factor correction capacitor)

 

 

Technical Specifications

 

Voltage range

  3-11 (kv)

Power range

 250-15000 (kw)

Input frequency range

45-65 (Hz)

Input current THD

Less than 4% at full load

Input power factor

More than 0.95 from 20 % to 100 % of nominal load

Efficiency

More than 0.95 at nominal load

Output frequency range

0.5-60 Hz

Output frequency resolution

0.01 Hz

 

Overload capability

120% for 5 Min.
150% for 3 Sec.
200% instant trip

Acceleration and deceleration time

1-3000 Sec.

Ingress Protection (IP)

Upon request

 

Cooling method

Air cooled

Water cooled for high power applications

Communication protocols

CAN, Profibus, Modebus, RS232, RS485

 

Features

  • BORNA MV-VFD is a voltage source inverter designed to control the speed of medium voltage motors.
  • The input section of this equipment is “phase shift transformer”; therefore input current THD is less than 5% at the loads over than 80% of the rated load.
  • Input power factor is more than 95% at the loads over than 20% of the rated load.
  • Low output voltage harmonic
  • BORNA MV-VFD is an efficient choice in cases where the motor’s voltage or frequency is not compatible with the existing network.
  • BORNA MV-VFD has the modular structure. Therefore, failed power-cells can be easily replaced and repaired. In ddition, this equipment is able to determine the failed power-cell.
  • User friendly HMI
  • Remote control capability and the possibility of connecting to the DCS by using standard protocols such as Profibus, Modbus, RS232, RS485, etc.

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