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IndustrialConverter Solutions - Renewable

IndustrialConverter Solutions - Renewable

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www.REOHM.de

• Compact dimensions

• Low weight

• Very high power density

• Use of power loss for heat
   management

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Solutions for the future of energy - products for solar and wind energy

Without doubt, wind and solar power plants are currently the cleanest form of energy and are now no longer considered as niche products but instead offer a real alternative to traditional methods of energy generation. Inverters are used in both wind and solar power installations and these achieve the highest efficiency ratings.

However, they do generate interference, which cannot be allowed onto the public mains network and is controlled by power quality standards, so that other electrical equipment is not affected by these disturbances.

REO has 90 years of experience in the application of inductive and resistive components, over a wide range of products and has gained a broad know-how, in particular with respect to EMC and Power Quality issues for inverter drives.

Wind energy technology

In contrast to solar energy, energy obtained from wind power is AC. To comply to standards for grid connected inverters, certain criteria like network frequency, sinusoidal output voltages and other interference factors have to be satisfied as well as factors like variable energy generation (variations in wind intensity). In this application, the AC power is first converted into DC power with an inverter.

In order to adhere to standards of electromagnetic compatibility (EMC), several components — from line filters, HF transformers, HF storage chokes, compensation chokes, mains and motor chokes to sinusoidal and harmonic filters — are utilised. REO supplements this range with resistive components like brake resistances for protection from overload conditions.

Water cooling for maximum power in a small space

Wind energy plants are becoming progressively more compact in order to achieve the best possible return from the smallest possible area. A solution to this offer water-cooled components that enable optimized cooling in the smallest space . REO manufactures a wide range of devices with water cooling - a pioneering alternative to air cooling.

Solar technology

Solar systems first generate DC voltage from solar energy, then a solar inverter converts DC into AC voltages. Single-phase or three-phase inverters can be used depending on the power requirement and application.

The ever-increasing efficiency of energy conversion in modern inverters is resulting in high-frequency energy that is fed to the DC circuits. This fast switching of power semiconductors can then result in a premature ageing of the solar modules.

REO components – like filter chokes and DC EMC filters – counteract this safely and reliably to optimise the service life. For inverters which require transformers, REO produce highly efficient ring core based designs, EMC filters and components for interference suppression and safety and current transducers and shunt resistances for current monitoring.

For transformer-less inverters, REO manufactures ring core chokes, storage chokes, filter chokes and resonance chokes. Single-phase or three-phase sinusoidal filters are particularly suitable for sine-wave filtering.

We are always there to listen to your requirements - just give us a call!

 

  • CNW 107.3/480

    High-current mains filters (3 lines)

    CNW 107.3/480
    • Nominal Voltage: 480 V
    • Rated current: 280 - 3000 A

    Applications: Suppression of frequency inverters, Power electronics and general suppression for higher power ratings on wind energy and industrial applications.



    • Conforming to: VDE 0565-3 / IEC 950 / UL 1283

    • Test voltage: L-N 2100 V,DC 1s, L/N-PE 2700 V,DC 1s

    • Overload: 1,5 x I 1 min/h

    • Climatic category: DIN IEC 68 Teil 1 25/085/21

  • REOHM series 156

    Max. continous power: 1.500 W

    BW 156
    • Resistance values: 1 - 1000 Ohm
    • Continuous power: 400 - 1500 W
    • max. operating voltage: 1000 V

    Resistances of REOHM Series 156 are characterized by their high power density with a small mounting area. Due to their high degree of protection up to IP66  they can be used even in particularly aggressive environmental conditions  (eg salt spray). The resistors are available as braking resistors , charge-, attenuation,- and filter resistors or as UL version.


    As BW (Braking resistor)


    When an electric machine operates as a generator (Electromotive brake), the brake resistor protects the machine from a voltage rise in the intermediate circuit. The current reduces als the speed of the machine. 


    As R (Charging resistor, damping resistor, filter resistance, etc.)


    The charging resistor is a current limiting resistor for the charging and discharging of capacitors and limitates for example the current flowing into the intermediate circuit capacitor inrush current. For this the device must be designed for a high single pulse energy and nominal voltage. The inductance of the resistor contributes to limit the inrush current, so wirewound resistors are the right choice.


    As UL version


    In addition to the high protection class IP66, the profile resistors REOHM 156 are also UL-certified and have a power of 50W up to 7.500 W (as combination).


     


    Maximum energy with minimum space



    • This unit is very compact with high power

    • In case of failure of resistor, this will become highly resistive.

    • Suitable for IP 66 applications

    • Test voltage: 2,5 kV AC (at 900 V rated voltage)


    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



  • CNW 114/500

    Three-phase mains filters (3 lines)

    CNW 114/500
    • Nominal Voltage: 500 V
    • Rated current: 80 - 1200 A

    Applications: Frequency converters for motor drives, wind power installations and power supply units



    • Conforming to: VDE 0565-3 / IEC 950 / UL 1283

    • Test voltage: L-L 2100 V, DC 1s, L-PE 2700 V, DC 1s

    • Overload: 1,5 x I 1 min/h

    • Climatic category: DIN IEC 68 Teil 1 25/085/21

  • CNW 174

    DC filter for photovoltaik (2 lines)

    CNW 174
    • Nominal Voltage: 900 V
    • Rated current: 10 - 600 A

    Applications: The DC-filter surpresses grid-bound troubles of inverters for renewable energies like solar and wind power. 



    • Conforming to: VDE 0565-3/ IEC 950/ UL 1283

    • Test voltage: L-L 3000 V, DC 1 s; L-PE 3000 V, DC 1s

    • Climatic category: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h

  • CNW 933

    Three-phase sinusoidal filter

    CNW 933
    • Nominal Voltage: 500 V
    • Rated current: 2 - 1200 A
    • Inductance per strand: 0,05 - 25 mH

    Sinusoidal output current - save costs and trouble-free operation.


    For particularly long cable lengths of > 100m between inverter and motor the shielded cable for EMI suppression used can cause a capacitive coupling. A conventional motor choke can not provide sufficient damping in such cases.


    The sinusoidal filter is a low pass from inductance and capacitance and has a very low resonance frequency. So it is able to generate a largely sinusoidal current. The operation and the loss balance of the asynchronous motor behave like the normal mains operation. The typical motor noise with converter do not occur and a shielded cable to the motor can be dispensed. Losses and heating are greatly minimized and the leakage current will be reduced. Longer motor cable lengths are possible. The motor insulation is protected, thus increasing the service life.


    The sinusoidal filter also attenuates the conducted interference in lower frequency range very good. The losses and the typical noise in the motor plate can be reduced.



    • Rated voltage: U ≤ 3 x 500 V

    • Max. voltage ripple: 5%

    • Field frequency: 0 - 60 Hz

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

    • Short-circuit voltage Uk: 8% (bei 400V)

    • Voltage drop: 18,4 V/Strang (bei IN und 50Hz)

    • Max. Cable length to the motor: 600 m (unshielded) 1000m (shielded)

    • 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 class: IP00

    • Climatic category: DIN IEC 60068-1

    • Overload: 1,5 x INenn 1 min / h

    • Ambient temperature: 40 °C

    • Design: standing on foot angle



    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

  • REOHM series 155 - Combination

    Max. continous power: 30.000 W

    BW 156
    • Resistance values: 0,8 - 820 Ohm
    • Continuous power: 4000 - 30000 W
    • max. operating voltage: 900 V

    As BW (Braking resistor)


    When an electric machine operates as a generator (Electromotive brake), the brake resistor protects the machine from a voltage rise in the intermediate circuit. The current reduces als the speed of the machine. 


    As R (Charging resistor, damping resistor, filter resistance, etc.)


    The charging resistor is a current limiting resistor for the charging and discharging of capacitors and limitates for example the current flowing into the intermediate circuit capacitor inrush current. For this the device must be designed for a high single pulse energy and nominal voltage. The inductance of the resistor contributes to limit the inrush current, so wirewound resistors are the right choice.


     


    Maximum energy with minimum space



    • This braking resistor of the REOHM series is very compact with high capacity

    • Maximum energy is provided in smallest space and very high protection rating

    • The resistor is to be as-sembled vertically with the terminal box at the bottom

    • Sufficient convection is to be ensured

    • Ratings higher than 22kW require a separate terminal box

    • Test voltage: 2,5 kV AC (at 900 V rated voltage

    • Ambient temperature: -10...+40°C

    • Max. temperature: >300°C



    Optional



    • With temperature switch

    • Cover for protection against high surface temperatures



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