DVS ELECTRO-MECHANICAL VOLTAGE STABILIZERS

Vega 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 (±15/±20% or ±25/±30%) can be dealt with. An automatic circuit breaker is mounted on the regulation circuit to protect against overload and short circuit on the voltage regulator, whilst the auxiliary circuit is protected by fuses. A digital display on the front panel shows the output voltage and the alarms (min/max output voltage, gearmotor lock, internal overheating, regulator overload). The control logic is based on a digital microprocessor. All Vega stabilizers are fitted with the same control card, thus simplifying maintenance operations and spare parts storage.

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.

Orion 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. The output voltage regulation is performed independently on each phase (stabilization of each phase- to-neutral voltage). Orion stabilizers are used with three-phase loads and single-phase loads with 100% current imbalance across the phases and asymmetrical mains voltage. For the correct operation, Orion voltage stabilizers require the neutral wire presence. Operation without neutral wire connection is achievable by adding a device able to generate it (D/Yn isolating transformer or neutral point reactor). An automatic circuit breaker is mounted 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 multi-task digital line analyser. Such instrument is able to provide with information regarding the voltage stabilizer output parametres, such as phase and linked voltage, current, power factor, active power, apparent power, reactive power, etc.. The alarms (min/max output voltage, gearmotor lock, internal overheating, regulator overload) are recognizable by means of LEDs on the control card. Voltage control and stabilisation, performed on the true RMS value, are managed by the digital microprocessor. Each phase of every stabilizer belonging to this range is controlled by the same control board used on Vega and Antares models, thus simplifying maintenance operations and spare parts storage. Up to 45kVA, the stabilizers are equipped with wheels for easy handling.

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.

• 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 stabilised. 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 arrestors.

Sirius 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 (only up to 2000kVA ±15% and equivalent). Sirius stabilizers are equipped with columnar voltage regulators which enable the achievement of high ratings (up to 6000kVA) and a solid and reliable construction, thus meeting the most diverse industrial applications. The Sirius voltage stabilizers regulate the output voltage independently on each phase. Similarly to the other models, 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 any case, 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 user interface consists of a multilingual 10" touch panel (fitted with RS485 port) 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 displaying all the information regarding each phase operating mode ('power on'; reaching of voltage regulation limits; increase/decrease of voltage regulation, etc.) and the possible alarms (minimum and maximum voltage, maximum current, overtemperature, etc.). The alarm indicators are accompanied by an acoustic alarm. The display is remotable using VNC software. It is also possible to communicate with the stabilizer with the Modbus TCP/IP protocol (standard communication protocol between electronic industrial equipment) via an Ethernet connection with RJ45 cable. The control system is also provided with two USB ports for downloading stored data and uploading new releases of the control card software. The Sirius stabilizer is provided with 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 stabilised. When the overload condition ceases to exist, the stabilizer switches automatically back to regular functioning. The control logic is managed by two DSP microprocessors (one performing the control and the other one managing the measurements) which obtain the output voltage stabilisation by adjusting its true RMS value. The whole system is supervised by a third 'bodyguard' microprocessor that controls the correct functioning of the other microprocessors. The unit parameters and reference output voltage value can be set via a PC connection, allowing for promptly dealing in the field with any issues concerning voltage stability. The output voltage is reset to the minimum value in case of blackout by means of supercapacitor banks in order to ensure the correct shutdown. All Sirius stabilizers are provided with Class I and Class II SPD surge arrestors.

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:

• Input automatic circuit breaker;
• Bypass switch via an interlocked automatic circuit breaker;
• Output interlocked motorized automatic circuit breaker;
• Integrated automatic power factor correction system.

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.