automatic voltage regulator

An ORTEA AVR Automatic Voltage Regulator is a power device destined to be positioned between the mains and the User.

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The purpose is to ensure that the User is fed a voltage subject to a variation much lower (±0.5% with regards to the nominal value) that the one guaranteed by the distributing system.

The stabilization is performed on the «true rms» voltage and it is not affected by harmonics in the mains. Due to the fact that the regulation does not involve any sine wave slicing (which is what happens in power electronic converters such as inverters and UPSs), neither an appreciable harmonic distortion nor a phase displacement is introduced on the downstream line.

The AVR Automatic Voltage Regulator is not affected by the load power factor (cos φ) and can operate with a load percentage varying between 0% and 100% on each phase. Regulation speed depends on the input voltage variation percentage and on the type of construction. Indicatively, said speed ranges between 8 and 30millisec/V.

Basically, An AVR Automatic Voltage Regulator is made of a buck/boost transformer, a voltage regulator and an electronic control. Based on a microprocessor that samples at high frequency the output voltage, the control system drives the regulator gearmotor.

By doing so, the regulator rollers change their position and therefore the voltage drawn and supplied to the buck/boost transformer primary winding. Being the secondary voltage of the buck/boost transformer in phase or in opposition to the supply, the voltage drawn from the regulator is added or subtracted to the mains voltage, thus compensating its variations.

The AVR Automatic Voltage Regulator can operate with input and output voltage different (380V/415V) from the rated voltage (400V).

The ORTEA AVR Automatic Voltage Regulator are designed and built in compliance with the European Directives concerning CE marking 2006/95/EEC (Low Voltage Directive) and 2004/EEC (Electromagnetic Compatibility Directive). Standard units are housed in an IP21 metallic enclosure RAL7035 painted. Cooling is guaranteed by natural air circulation aided by extracting fans over a certain temperature.

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