Liquid-cooled chokes

Liquid-cooled chokes

Reducing the volume of construction with
liquid-cooled chokes

With the help of liquid cooling losses are derived specifically about the cooling circuit - and not in the environment.

By use of liquid cooling, the temperatures in the components can be reduced greatly -
ie less stress for the insulation materials and longer life.

Advantages of liquid cooling in chokes.
- Low surface temperature
- Increased service life
- Reducing the volume of construction

  • CNW MC 903

    Fully encapsulated three-phase mains choke 4% Uk

    CNW MC 903
    • Nominal Voltage: 500 V
    • Rated current: 6 - 70 A
    • Inductance: 0,42 - 4,88 mH

    Mains choke with water cooling for use on the mains side of the converter to reduce harmonics and commutation losses. By using water cooling, higher performances and a smaller design of the device can be implemented. Modular design for IP 00, IP 20 and IP 64/66 possible.



    • Conforming to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, DC 1min; L-PE 2500 V, DC 1min

    • Rated voltage: U = 3 x 500 V

    • Insulation material class: T40/B

    • Protection: Variants of IP00 up to IP66 possible

    • Climartic category: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h



  • CNW MD 835

    Liquid-cooled 5-limb-motor choke

    CNW MD 835
    • Nominal Voltage: 500 V
    • Rated current: 450 - 700 A
    • Inductance per strand: 0,02 - 0,042 mH

    Common problems at the inverter - reduce weight and volume.


    In addition to the typical problems at the inverter like voltage rise, symmetrical and asymmetrical current distortions, there is also the problem of common mode noise in multilevel inverters. In operation with common-mode interference occurs already at low currents to strong warming and in nominal operation can lead to the destruction of the choke.


    The motor choke CNW 835 reduces the voltage rise and the voltage spikes between the conductors. Furthermore, the current is smoothed; losses and heating are minimized and the leakage current reduced. Longer motor cable lengths are possible. By limiting the rate of voltage rise, the motor insulation is protected and thus prolongs the life. The motor choke also attenuates the conducted interference in lower frequency range very good. The losses and the typical noise in the motor plate can be reduced. 


    Voltage rises (<500V / us) will be reduced.


    Increasing the service life of motors, reduction of edge steepness dv/dt to earth and between phases, reduce motor noise, current smoothing.



    • Rated voltage: U ≤ 3 x 500 V

    • Reduce the voltage rise dv / dt to < 500V/µs

    • Field frequency: 0 - 60 Hz

    • Drive switching frequency: up to 150 A >4kHz, from 150 A >1,5KHz

    • According to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, AC/50Hz 60s; L-PE 2500 V, AC/50Hz 60s

    • insulation class: T50/F

    • Protection rating: IP00

    • Climatic categorie: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h

    • Ambient temperature: 40 °C

    • Design: standing on foot angle



    Typical applications



    • Smoothing of current and voltage in regenerative converters

    • Damping of common-mode interference

  • CNW MD 854

    Liquid-cooled three-phase motor choke 2% Uk

    CNW MD 854
    • Nominal Voltage: 400 V
    • Rated current: 200 - 1200 A
    • Inductance per strand: 0,012 - 0,074 mH

    Voltage rise (<200V / us) and current distortions reduce - protect electrical consumers optimally. The motor choke reduces the voltage rise and the voltage spikes between the conductors. Furthermore, the current is smoothed.


    By efficiently cooling the power losses is dissipated up to 80% in cooling and reduces heating of switching cabinets. The targeted derivative of the losses via the cooling circuit prevents that losses are discharged into the environment. By using water cooling the temperatures in the components can be reduced greatly - this means less stress for the insulation materials and a longer service life.


    Losses and heating are minimized and the leakage current reduced. Longer motor cable lengths are possible. By limiting the rate of voltage rise, the motor insulation is protected and thus prolongs the life. The motor choke also attenuates the conducted interference in lower frequency range very good. The losses and the typical noise in the motor plate can be reduced. Increasing the service life of motors, reduction of edge steepness dv / dt to earth and between phases, reduce motor noise, current smoothing.



    • Rated voltage: U ≤ 3 x 400 V

    • Reduce the voltage rise dv / dt to < 200V/µs

    • Field frequency: 0 - 60 Hz

    • Drive switching frequency: up to 150 A >4kHz, from 150 A >1,5KHz

    • According to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, AC/50Hz 60s; L-PE 2500 V, AC/50Hz 60s

    • Insulation class: T40/F

    • Protection rating: IP00

    • Climatic categorie: DIN IEC 60068-1

    • Ambient temperature: 40 °C

    • Cooling medium: Water/Glycol (70/30 %)

    • Max. Coolant outlet temperature: 50° C

    • Flow rate: min. 3,6 l/min.

    • Pressure drop: <0,5 bar


     


    Typical applications



    • Drive systems for motor drives:


      • Mechanical engineering

      • Elevators / escalators

      • Pipes

      • Conveyor technology

      • Ventilation and air conditioning

      • Robotics

      • Automation technology


    • Power supplies

    • Wind turbines

  • CNW MD 903

    Three-phase mains choke with indirect cooling 4% Uk

    CNW MD 903
    • Nominal Voltage: 400 V
    • Rated current: 200 - 1200 A
    • Inductance: 0,024 - 0,147 mH

    Power Noise Reduction - save up to 20% energy costs.


    A mains choke relieved the supply network by compensating the harmonics reactive power. The harmonics and commutation notches are reduced strongly. By efficiently cooling the power losses is dissipated up to 80% in cooling and reduces heating of switching cabinets. The targeted derivative of the losses via the cooling circuit prevents that losses are discharged into the environment. By using water cooling the temperatures in the components can be reduced greatly - this means less stress for the insulation materials and a longer service life.


    Starting currents and current peaks are reduced up to 60%. Mains chokes helps to comply with international power quality standards IEEE 519 or EN 61000-3-2.



    • Rated current: U ≤ 3 x 400 V

    • Short circuit:: Uk 4% (400VAC/50Hz, INenn)

    • Frequency:  50/60 Hz

    • According to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, DC 1min; L-PE 2500 V, DC 1min

    • Insulation class: T40/F

    • Protection rating: IP00

    • Climatic categorie: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h

    • Cooling medium: Water/Glycol (70/30 %)

    • Max. Coolant outlet temperature: 50 ° C

    • Flow rate: min. 3,6 l/min.

    • Pressure drop: <0,5 bar




    Typical applications



    • Drive systems for motor drives:


      • Mechanical engineering

      • Elevators / escalators

      • Pipes

      • Conveyor technology

      • Ventilation and air conditioning

      • Robotics

      • Automation technology


    • Power supplies

    • Wind turbines

  • CNW MD 953

    Water-cooled three-phase mains choke 8% Uk

    CNW MD 953
    • Nominal Voltage: 400 V
    • Rated current: 200 - 1200 A
    • Inductance: 0,012 - 0,074 mH

    Power Noise Reduction - save energy costs. The water-cooled power / filter choke CNW MD 953 series has been specially developed for smoothing flows in regenerative converters. By efficiently cooling the power losses is dissipated up to 80% by cooling and reduces heating of switching cabinets. The CNW MD 953 is also suitable for use as a filter choke in LCL filters.


    By using a mains choke the inverter electronics and DC-capacitors will be protected.


    Starting currents and current peaks are reduced up to 60%. Mains chokes helps to comply with international power quality standards IEEE 519 or EN 61000-3-2.



    • Rated voltage: U ≤ 3 x 500 V

    • Short circuit: Uk 8% (400VAC/50Hz, INenn)

    • Frequency: 50/60 Hz

    • According to: EN 60289 / EN 61558

    • Test voltage: L-L 2500 V, 50Hz 60s; L-PE 2500 V, 50Hz 60s

    • Insulation class: T50/F

    • Protection rating: IP00

    • Climatic categorie: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h

    • Cooling: Water/Glykol (70/30 %)

    • Max. increased coolant inlet temperature: 50° C

    • Flow rate: min. 3,6 l/min.

    • Pressure drop: <0,5 bar



    Typical applications



    • Drive systems for motor drives:


      • Mechanical engineering

      • Conveyor technology

      • Automation technology


    • Wind turbines

    • Solar systems



  • NTT MD 953

    Liquid-cooled three-phase mains choke 8% Uk

    NTT MD 953
    • Nominal Voltage: 400 V
    • Rated current: 200 - 1200 A
    • Inductance: 0,012 - 0,074 mH

    Watercooled chokes are available are available with ingress protection ratings IP00 to IP65. REO can utilise several methods of water cooling these components. This provides controlled conduction of heat losses, ensuring that the local environment is not heated. Water cooling ensures that component temperatures are greatly reduced, reducing component stress and increasing product life. REO technology provides excellent heat distribution, preventing the emergence of so-called hot spots.



    • Winding material : Aluminum

    • Insulation class: F

    • Cooling medium: Water/Glycol (70/30 %)

    • Max. coolant inlet temperature.: 50° C

    • Flow rate: min. 3,6 l/min.

    • Pressure drop: <0,5 bar


     


    Typical applications



    • AFE Drives



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