IndustrialConverter Solutions - Renewable

IndustrialConverter Solutions - Renewable

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 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



  • 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



  • 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



  • RFT-VV

    Toroidal fixed transformers, fully sealed

    RFT-VV
    • Rated power: 10 - 6000 VA
    • Input voltage: 230 V

    Toroidal transformer fully sealed as mains transformer, autotransformer, safety isolating transformer, isolating transformer. 


    All benefits of the toroidal transformer are combined in fully sealed toroidal transformers in a special plastic housing. The shape of the housing can be adapted exactly to the application. The plastic housing provides optimal mechanical protection against humidity and dust and provides in addition better heat conduction which leads to an increased power density.


    The mounting is carried out by means of a central screw and allows therefore a short mounting time.



    • Conform to: EN 61558-2-6, EN 61558-2-4, EN 61558-2-1

    • Maximum production : up to 6 kVA

    • Voltages: 24 up to max. 690V

    • Frequency range: 50-400Hz

    • Rated currents: up to 50 A

    • Temperature class: T40/E und T40/B


    Special voltages and higher capacities on request

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    Industrial Converter Solutions - Renewable
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    Industrial Converter Solutions - Renewable

    Components for Solar and Wind Power Generation
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    Protection Ratings
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    Protection Ratings

    Discover our brochure about high protection ratings!
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    EMC-Filter Product catalogue
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    HF-components Product catalogue

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    Current and voltage sensors catalogue
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    Current and voltage sensors catalogue

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    Liquid cooled systems catalog
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    Liquid cooled systems catalog

    Product catalog for liquid cooled systems
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    Components for wind power generation Catalouge
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    Components for wind power generation Catalouge

    REO components for wind power generation Safe application for onshore and offshore installations
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    Braking resistors Overview
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    Braking resistors Overview

    REO Braking- and charging resistors The product range at a glance
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    Liquid-cooled components
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    Liquid-cooled components

    Liquid-cooled components The product range at a glance
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    REO chokes with high protection ratings
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    REO chokes with high protection ratings

    REO chokes with high protection ratings Fully encapsulated REO chokes
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    REOSOL
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    REOSOL

    Chokes for solar applications
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