A voltage stabilizer is a power device destined to be positioned between the mains and the User. 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 intervention on the sinewave, neither an appreciable harmonic distortion nor a phase displacement is introduced on the downstream line.
The stabilizer 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, a voltage stabilizer 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 voltage regulator is nothing but an autotransformer with continuously variable transformer ratio.
Depending on the stabilizer power, the regulator can be either toroidal or columnar.
The stabilizers are designed and built in compliance with the European Directives concerning CE marking (Low Voltage and Electromagnetic Compatibility Directives).
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.
The voltage stabilizer operating nominal voltage can be chosen from values (generally included in the range 380V / 415V). Such setting can be performed at the factory or at the Customer’s premises according to the instructions given in the reference technical handbook.
On Sirius and Sirius Advance stabilizers, the output voltage reference and the main configuration parameters can be set in different ways:
– through the local touch panel;
– directly by communicating with the microprocessor via a PC connection (through USB interfaces);
– from a remote station via Ethernet with MODBUS TCP/IP protocol.
Selectable output voltage (dip-switch)* | 220-230-240V |
Output voltage accuracy | ±0,5% |
Frequency | 50Hz ±5% or 60Hz ±5% |
Admitted load variation | Up to 100% |
Cooling | Natural ventilation |
Ambient temperature | -25/+45°C |
Storage temperature | -25/+60°C |
Max relative humidity | 95% (non condensing) |
Admitted overload | 200% 2 min. |
Harmonic distortion | None introduced |
Colour | RAL 7035 |
Protection degree | IP 21 |
Instrumentation | Output digital voltmetre |
Installation | Indoor |
Selectable output voltage (dip-switch)* | 220-230-240V |
Output voltage accuracy | ±0,5% |
Frequency | 50Hz ±5% or 60Hz ±5% |
Admitted load variation | Up to 100% |
Cooling | Natural ventilation (aided with fans) |
Ambient temperature | -25/+45°C |
Storage temperature | -25/+60°C |
Max relative humidity | 95% (non condensing) |
Admitted overload | 200% 2 min. |
Harmonic distortion | None introduced |
Colour | RAL 7035 |
Protection degree | IP 21 |
Instrumentation | Output digital voltmetre |
Installation | Indoor |
Overvoltage protection | Class II output surge arrestor |
Antares stabilizers are available for different ranges of input voltage fluctuation.
Standard models offer a double input connection so that with the same unit two different input variations (±1 5%/±20% or ±25%/±30%) can be dealt with.
An automatic circuit breaker is provided on the regulation circuit to protect against overload and short circuit on the voltage regulator whilst the auxiliary circuit is protected by fuses.
The instrumentation consists of a digital multimetre installed on the cabinet front panel. The alarms (min/max output voltage, gearmotor lock, internal overheating, regulator overload) are recognizable by means of LEDs on the control card.
The control logic is based on a digital microprocessor.
All Antares stabilizers are fitted with the same control card, thus simplifying maintenance operations and spare parts storage.
Voltage stabilisation | Independent phase control |
Selectable output voltage (dip-switch)* | 220-230-240V (L-N) / 380-400-415V (L-L) |
Output voltage accuracy | ±0,5% |
Frequency | 50Hz ±5% or 60Hz ±5% |
Admitted load variation | Up to 100% |
Admitted load imbalance | 100% |
Cooling | Natural air ventilation up to 45kVA ±15% Aided with fans from 60kVA ±15% |
Ambient temperature | -25/+45°C |
Storage temperature | -25/+60°C |
Max relative humidity | 95% (non condensing) |
Admitted overload | 200% 2 min. |
Harmonic distortion | None introduced |
Colour | RAL 7035 |
Protection degree | IP 21 |
Instrumentation | Output digital multimetre |
Installation | Indoor |
Overvoltage protection | Output Class II surge arrestor (over 60kVA ±15%) |
Voltage stabilisation | Independent phase control |
PC selectable output voltage* | from 210 to 255V (L-N) from 360 to 440V (L-L) |
Output voltage accuracy | ±0,5% |
Frequency | 50Hz ±5% or 60Hz ±5% |
Admitted load variation | Up to 100% |
Admitted load imbalance | 100% |
Cooling | Natural air ventilation. From 35°C aided with fans |
Ambient temperature | -25/+45°C |
Storage temperature | -25/+60°C |
Max relative humidity | 95% (non condensing) |
Admitted overload | 200% 2 min. |
Harmonic distortion | None introduced |
Colour | RAL 7035 |
Protection degree | IP 21 |
Instrumentation | Input & output digital multimetre |
Installation | Indoor |
Overvoltage protection | Class II output surge arrestor Optimal voltage return through supercapacitors in case of blackout |
Orion Plus stabilizers are available for different ranges of input voltage fluctuation. In the ±15%/ ±20% and ±25%/ ±30% types, the change of input range is obtained through different internal connections.
The Orion Plus voltage stabilizers regulate the output voltage independently on each phase.
Similarly to the Orion stabilizers, they can supply any single-phase, bi-phase and three-phase load even in case of and up to 100% unbalanced load current and asymmetrical mains distribution.
In this configuration, the presence of the neutral wire is required. The stabilizer can also operate without neutral wire by adding a device able to generate it (D/zn or D /yn isolating transformer or neutral point reactor).
The stabilizers are cooled via natural air ventilation, assisted by extracting fans when the cabinet internal temperature exceeds 35°C).
The instrumentation consists of two multi-task digital line analysers which are able to provide with information regarding the status of the lines upstream and downstream the voltage stabilizer (phase and linked voltages, current, power factor, active power, apparent power, reactive power, etc.)
The operating status of the stabilizer can be monitored by means of the LEDs on the front panel displaying all the information regarding each phase operating mode ('power on'; reaching of voltage regulation limits; increase/decrease of voltage regulation) and the possible alarms (minimum and maximum voltage, maximum current: overtemperature; ventilation failure). The alarm indicators are accompanied by an acoustic alarm.
The auxiliary circuits are protected by fuses.
The control logic, performed on the true RMS value, is based on DSP microprocessors.
The unit parameters and the output voltage reference can be set by using a personal computer, thus allowing for dealing directly in the field with any problems related to voltage stability.
All Orion Plus stabilizers are provided with Class II SPD surge arrestors.
Voltage stabilisation | Independent phase control |
Output voltage selectable via display, PC and/or Ethernet* | from 210 to 255V (L-N) from 360 to 440V (L-L) |
Output voltage accuracy | ±0,5% |
Frequency | 50Hz ±5% or 60Hz ±5% |
Admitted load variation | Up to 100% |
Admitted load imbalance | 100% |
Cooling | Natural air ventilation. Above 35°C aided with fans |
Ambient temperature | -25/+45°C |
Storage temperature | -25/+60°C |
Max relative humidity | 95% (non condensing) |
Admitted overload | 200% 2 min. |
Harmonic distortion | None introduced |
Colour | RAL 7035 |
Protection degree | IP 21 |
User interface | 10" touch panel (multilingual) remotely available via VNC |
Installation | Indoor |
Regulator overload protection | Digital control |
Communication system | Ethernet / USB / MODBUS TCP/IP |
Overvoltage protection | Class I input surge arrestor Class II output surge arrestor Optimal voltage return through supercapacitors in case of blackout |
Voltage stabilisation | Independent phase control |
Output voltage selectable via display, PC and/or Ethernet* | from 210 to 255V (L-N) from 360 to 440V (L-L) |
Output voltage accuracy | ±0,5% |
Frequency | 50Hz ±5% or 60Hz ±5% |
Admitted load variation | Up to 100% |
Admitted load imbalance | 100% |
Cooling | Natural air ventilation. Above 35°C aided with fans |
Ambient temperature | -25/+45°C |
Storage temperature | -25/+60°C |
Max relative humidity | 95% (non condensing) |
Admitted overload | 200% 2 min. |
Harmonic distortion | None introduced |
Colour | RAL 7035 |
Protection degree | IP 21 |
User interface | 10" touch panel (multilingual) remotely available via VNC Reactive power regulator |
Installation | Indoor |
Regulator overload protection | Digital control |
Communication system | Ethernet / USB / MODBUS TCP/IP |
Overvoltage protection | Class I input surge arrestor Class II output surge arrestor Optimal voltage return through supercapacitors in case of blackout |
Total protection and by-pass kit | Input automatic circuit breaker By-pass switch made of an interlocked automatic circuit breaker Output interlocked motorized automatic circuit breaker with protection against overload, overvoltage, undervoltage, phase sequence error and phase failure |
Integrated automatic power factor correction system | Based on high energy density metallised poly-propylene three-phase capacitors (Un = 525V) Three-phase blocking reactor (tuning frequency – 180Hz) |
Sirius Advance voltage stabilizers derive from the SIRIUS type, of which they maintain the main technical characteristics.
The standard integration of some functions and accessories usually offered as optional, complete and enrich the equipment.
The additional features are:
The input automatic circuit breaker (QF1) ensures protection against failure and/or short-circuits inside the unit.
The bypass automatic circuit breaker (QF2) protects the line supplying the load against overload and shortcircuits in bypass condition.
The output motorized automatic circuit breaker (QF3), interlocked with the bypass switch, protects against overload, short-circuit, overvoltage, undervoltage, phase sequence error and phase failure.
The integrated automatic Power Factor Correction system maintains the power factor value (cos φ) to a high level ensuring the known advantages for the users but also affecting the sizing of the stabilizer. The PFC system exploits high energy density metallised polypropylene three-phase capacitors (Un=525V) exclusively thus guaranteeing robustness and reliability. The addition of blocking reactors (detuned filters) eliminates undesired harmonics and protects the capacitors.
The reactive power controller is mounted on the external control synoptic panel.