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Variable Frequency Drive Triol AT27 line RX

Medium Voltage Variable Frequency Drive AT27 line RX is a versatile and reliable solution for general industrial applications. AT27 RX is a block-box (insulated container) for outdoor use.


The power cells and transformer are designed for long-term and reliable operation in harsh climatic conditions.


All switching devices and output filters are installed directly in the block-box Variable Frequency Drive Triol AT27 VFD line RX.


Factory warranty for the entire product. There is no division of responsibility between the manufacturer of the building and the manufacturer of the frequency converter of the standard cabinet design. Triol AT27 VFD line RX is an assurance in the reliable operation of VFD.


Various installation options for Variable Frequency Drive Triol  AT27 RX are possible: on a pile field, on a foundation, on concrete slabs.


Triol AT27 VFD line RX custom design allows you: to take into account the features of the installation place; to design the appearance of special requirement; to equip the drive with stairs and platforms for servicing the most convenient configuration.


Variable Frequency Drive Triol AT27 line RX is equipped with external warning devices (alarm lamp and buzzer) that allows you monitoring the status of the drive from a distance.


Triol AT27 VFD line RX is equipped with a fire alarm system. It is optionally possible to install a burglar alarm system with access via magnetic cards and an automatic aerosol fire extinguishing system.

  • a built-in climate control (HVAC) system – ventilation, heating, air conditioning systems
  • cold and hot air mixing chambers
  • rain and snow protection
  • resistance to ice
  • Operating temperature maximum range -60 ºС…+50 ºС
  • Outdoor
  • Enclosure NEMA3 (IP43)
  • Minimum constructing and installation costs
  • No expenses for HVAC system
  • Color touchpad 7”
  • Wi-Fi Wizard
  • Induction and permanent magnet motor
  • Output voltage and current sinusoidal
  • High power factor ≥ 0.96
  • Operating in unstable mains
  • Build-in switching devices and output filters
  • Full factory readiness
  • Factory warranty
Input voltage, kV3; 3.3; 4.16; 6; 6.3; 6.6; 10; 11 (-15 % …+10 %)

-45% continuous with power limit

-100% not less than 100 ms with controlled generator mode of the motor

Input frequency, Hz50 / 60 (-10 %…+10 %)
Power, kW3 / 3.3 kV

4.16 kV

6 / 6.3 / 6.6 kV

10 / 11 kV

from 160 kW up to 3000 kW

from 160 kW up to 3500 kW

from 200 kW up to 5000 kW

from 320 kW up to 8000 kW

Power factor0.96
THDi (input current), %< 5
Pulses of rectifier18; 24; 30; 36; 48; 54

(depends on the number of cells in each phase)

Overvoltage protectionSurge arresters
Rated output voltage, kV3.3; 4.16, 6; 6.6; 10; 11
Output frequency, Hzfrom 0.5 up to 120
Frequency resolution, Hz0.01
Output current, A25…600
Overcurrent characteristics120 % of rated value for 120 sec

150 % of rated value for 3 sec

THDi (output current), %< 2
THDu (output voltage), %< 5
dV/dt value< 1000 V/μs
Efficiency, %≥ 97
Copper transformerCopper bus is the material used for transformer windings. Transformer parameters and efficiency are commensurable with the basic type of transformer with windings of aluminum busbars
Mechanical bypass of power cellsBypass of each power cell of the drive is made on the basis of a vacuum chamber, with a response time of not more than 4 msec
IGBT bypass of power cellsBypass of each power cell of the drive, made on the basis of IGBT transistors
Additional power cell in each phaseFor compensating voltage drop on the output sine-filter or reactors (if available) and the long cable line, as well as to ensure operation in the nominal mode in the case of bypassing the cells (with this option)
Increased operating temperatureMaximum operating temperature up to +50 °С
Side cable entryOrganization of terminals for entry power and signal cables on side of the AT27
Additional PCB coverageCoating of printed circuit boards with a special varnish to protect against aggressive impurities in the air
Electromagnetic door lockElectromagnetic locks on the doors of the AT27 power compartments provide protection against opening doors when medium voltage is applied
Reactors for transfer of the motor to mainsDesigned to provide synchronous and shockless transfer of the motor to mains.
Sine-filterDesigned to improve of the output current and voltage THD, as well as reduce the value of the parameter dV/dt.
Medium-voltage switch compartmentAllow you to implement the required one-line diagram
Profibus communication protocolConvertor Modbus-Profibus
Burglar alarm systemAlerts the operator of unauthorized entry into the block-box
Automatic aerosol fire extinguishing systemCarries out automatic fire extinguishing in case of its occurrence in block-box