Voltage stabilizers REG

The REG stabilisers are registered names of two series of electrodynamic voltage stabilisers that offer a reliable and tested economic solution to inconveniences caused by voltage fluctuations. Their use is a real investment because the elimination of the inconveniences means a reduction in costs and an increase in productivity.

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Range from 1 to 4750 kVA with compensation of input voltage fluctuations up to ±30% or greater upon request. Stabilisers with the following characteristics can be supplied:

• Single-phase: 100-110-115-120-127-200-220-230-240-265-277V

• Three-phase: 208-220-230-240-380-400-415-440-460-480-500V

• Frequency: 50 or 60 Hz

Accuracy at true RMS value of 0.5% to ±1.5%, depending on model, even where strong harmonic distortions are present on the line. Correction speed.The advanced electronic control circuit ensures a fast response, from 11 to 50 ms/Volt depending on model. Overload capacity up to 10 times the rated current for 10 milliseconds, 5 times for 6 seconds and 2 times for 1 minute. Efficiency from 96% up to more than 98% depending on model. Insensitivity to power factor and load variations Insensitivity to frequency variations up to ±5%.

Waveform distortion is always less than 0.2% in any working condition. Impedance from 0.52 to 0.0015 ohm according to the model. It does not affect the line impedance. Therefore the installation of REG-T and REG-Y in an already existing plant does not require a new calculation of the protections.

Operating temperature up to +40°C. Models suitable for operation at temperatures higher than 40°C are manufactured on request. 4 degrees of protection: IP00, IP21, IP54 INDOOR and OUTDOOR.

3 cooling systems according to the type of enclosure and the ambient conditions of the installation site:

  • natural air convection for all IP21 models
  • forced ventilation for IP54 models
  • air conditioning for IP54 models installed in particularly hot and/or humid areas.

Reliability (MTBF) exceeding 500,000 hours. This is the result of the continuous improvements brought about since 1947. Compliance to Standards: Electro Magnetic Compatibility 2014/30/UE and following amendments; Low Voltage Electrical Equipment 2014/35/UE and following amendments.

Power supply and professional users

The voltage fluctuations are particularly treacherous interferences since they are not seen and can only be detected by using specific instrumentation. When such interferences are present, the electrical equipment seems to maintain correct operation but disguises serious problems that at times are beyond repair.

Even an ordinary light bulb, if overpowered by 10%, continues to give light, but halves its operating life; if underpowered by the same percentage it loses 30% of its brightness. The situation becomes much more serious in the case of voltage variations on more complicated equipment:

  • a computer may become damaged or make unexpected errors;
  • a laser cutting machine undergoes changes in the “laser beam mode”, resulting in cutting burrs or the shutting off of the beam;
  • an electric drive causes undesired changes in the speed of the powered motor and damage to the data storage and power terminals;
  • an “electromedical” device gives incorrect results, wastes expensive reagents and loses the samples to be analysed.

Cooling natural air convection

This is the distinctive characteristic of all models with protection degree IP21; it dramatically increases the reliability as the cooling of the magnetic components and the electronic control boards is ensured by natural convection without fans. Fans and the relevant filters must be constantly checked, cleaned and periodically replaced. Moreover, the absence of fans avoids sucking of dust which would deposit on the copper tracks reducing the contact surface between the electro-graphite rolls and the transformer tracks. As a consequence, this would cause roughness, sparks and copper smelting, phenomena that in the long run would damage the component and reduce its life expectancy. When the voltage is stable and the contact point is the same for several minutes, temperature can exceed 200°C. To avoid this problem, many manufacturers of voltage stabilisers install fans on the brush holder.

The pictures clearly show that NO fan is used in Aunilec variable transformers to cool down the contact point between brushes and turns. This is possible thanks to the thermal dissipation being the result of:

Cela est possible grâce à la faible dissipation thermique résultant :

  • the correct sizing and the high permeability of the magnetic cores;
  • the low density of current flowing through the windings of the variable transformers, and consequently the reduced thermal dissipation;
  • the square section of the linear variable transformers.

REG stabilisers are particularly suitable for applications that require: 

  • high reliability. For example they can be installed in areas with difficult access, subject to critical environmental conditions due to cold, high temperatures, humidity, atmospheric discharges;
  • capability to compensate wide mains voltage variations. This is a typical requirement of equipment installed in areas that are far from the distribution transformer substation and in fast developing countries.
  • high precision of the stabilised voltage. Ideal condition for calibration and inspection stands, electric furnaces, professional lighting equipment;
  • stabilisation of high power users or with high inrush currents like e.g. motors, air conditioners, compressors, pumps;
  • simple and limited maintenance. Very important feature where it is difficult to find qualified personnel for servicing;
  • wide range of models. According to the ambient conditions, the stabilisers can be supplied in enclosures with protection degree IP00, IP21, IP54 INDOOR, IP54 OUTDOOR.