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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 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 the inverter and motor the shielded cable for EMI suppression used can cause a capacitive coupling. A conventional motor choke cannot 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 does 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) 1,000m (shielded)
    • According to: EN 60289 / EN 61558
    • Test voltage: L-L 2,500 V, AC/50Hz 60s; L-PE 2,500 V, AC/50Hz 60s
    • Insulation class: T40/F
    • Protection class: IP00
    • Climatic category: DIN IEC 60068-1
    • Overload: 1.5 x Irated 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. continuous 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 with 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


  • CNW 806

    Three-phase-dv/dt filter

    CNW 806
    • Nominal Voltage: 500 V
    • Rated current: 4 - 1200 A
    • Inductance: 0.005 - 1.5 mH

    Reduce voltage rise to < 500V/µs - electrical consumers and insulation will protected with low costs. 

    A simple and inexpensive method for reducing the rate of voltage rise is to use a du / dt filter or throttle. It dampens the voltage rise to acceptable values and prevents overvoltages on long supply lines.

    Losses and heating are minimized and the leakage current reduced. By limiting the rate of voltage rise, the motor insulation is protected and, therefore, its life is prolonged.

    Also, the electromagnetic interference can be reduced in the radiation range of 1 MHz to 30 MHz.

    • Rated voltage: U ≤ 3 x 500 V
    • Reduce voltage rice 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 2,500 V, AC/50Hz 60s; L-PE 2,500 V, AC/50Hz 60s
    • Insulation class: T40/F
    • Protection rating: 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


  • 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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    Components for wind power generation Catalouge
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    Braking resistors Overview
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    Braking resistors Overview

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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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