Orion Plus is a three phase electro-mechanical stabilizer. The electromechanical stabilizers are digitally controlled and are made essentially of buck-boost transformer, voltage regulator and electronic control. By means of the digitally controlled system, the stabilizer is able to compensate for a widely fluctuating incoming voltage stabilizing it within a ±0.5% accuracy range in relation to the rated value. Based on a microprocessor sampling the output voltage at high frequency, the control system operates the voltage regulator motors in order to guarantee the voltage stability. The electromechanical stabilizers are often used in industrial installations, or installations of big nominal power, where the most important criteria are endurance in very high or very low voltages and a high degree of stabilization.
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 analyzers 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: over temperature; ventilation failure). The alarm indicators are accompanied by an acoustic alarm.
- Up to 250kVA ±15%, the regulation circuit is protected against overload and short circuit on the voltage regulator by an automatic circuit breaker.
- From 300kVA ±15%, an electronic voltage regulator protection system activates in case of overload on the voltage regulator. In such condition, the load supply is not interrupted, but the stabilizer output voltage is automatically set to the lower between the mains voltage and the pre-set output voltage. The service continuity is guaranteed, although the voltage is not stabilized. When the overload condition ceases to exist, the stabilizer switches automatically back to regular functioning.
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 arrestor.