UNIQUE AT HEART
FOR 70 YEARS
Three-phase 3-120 kVA
Independent regulation of each phase
Three-phase 3.5-32 kVA
Common regulation of the three phases
Three-phase 45-8000 kVA
Independent regulation of each phase
Ministab and Sterostab are registered names of two series of voltage stabilizers that offer a reliable and tested economic solution to inconveniences caused by voltage fluctuations. The use of voltage stabilizers increases the level of power quality and represents a real investment because the elimination of the inconveniences means a reduction in costs and an increase in productivity.
Very often it is only necessary to avoid a few minutes machine downtime or just one failure to repay the cost of the voltage stabilizers.
Ministab and Sterostab 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;
- voltage stabilization 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 voltage stabilizers can be supplied in enclosures with protection degree IP00, IP21, IP54 INDOOR, IP54 OUTDOOR.
Extended warranty to 5 years.
In the voltage stabilisers with IP21 protection degree, cooling in is ensured by natural convection only. The total absence of fans (fan-free) increases the reliability of the product dramatically and makes the use of filters, which would need constant maintenance, unnecessary.
The criteria used to size the electrical and electronic parts of all IREM voltage stabilisers guarantee the greatest reliability.
The declared performance is always ensured in the most several and critical conditions for unlimited time (heavy duty): nominal power with minimum input voltage, highest input current and at the declared ambient temperature.
Single-phase and three-phase voltage stabilisers from 1 kVA up to 8000 kVA. Voltage range from 110V to 500V.
All the voltage stabilisers are available in symmetrical configuration ±10%, ±15%, ±20%, ±25%, ±30% and in asymmetrical configuration -35% +15%. Different configurations are available on request.
IREM voltage stabilisers are characterized by long life, no degradation of performance over time and reduced maintenance requirements, thanks to the robustness of construction and the high quality of the materials used.
The whole range of voltage stabilisers has a very high level of customization, both in terms of electrical characteristics as well as mechanical and aesthetic. A staff of technicians specially dedicated to “special” projects can satisfy the most demanding requests.
SHORT DELIVERY TIMES
The particular architecture of IREM voltage stabilisers allows to satisfy in a short time even the most demanding project, reducing design and production times. Moreover, the modular system used for higher power models simplifies transport and reduces time and cost.
COOLING BY NATURAL AIR CONVECTION,
This is the distinctive characteristic of all IREM voltage stabilisers 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 (fafree system). 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 voltage 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.
The pictures clearly show that NO fan is used in IREM voltage variable transformers to cool down the contact point between brushes and turns. This is possible thanks to the thermal dissipation being the result of:
- 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.
DECLARED POWER ON HEAVY DUTY
The fundamental parameter of a voltage stabiliser is the nominal power; it is expressed in kVA and the relevant number, indicated in the name plate, represents the maximum power that the equipment can deliver. The power figure of a voltage stabilizer must however be contextualized with reference to the service class, to the input voltage fluctuations and to the ambient temperature.
THE SERVICE CLASS.
The standards define different types of service, i.e. operating conditions, for the electric machines.
INPUT VOLTAGE FLUCTUATIONS.
A voltage stabilizer is characterized by the ability to compensate for the fluctuations in the mains voltage and to supply the connected load at a constant voltage and close to the nominal value. The work of the voltage stabilizer is to supply the additive or subtractive compensation voltage which will act as a corrective for the mains voltage. The most heavy working condition is in presence of the minimum mains voltage in input. All IREM voltage stabilizers are characterized by the ability to stabilize the output voltage when the mains is in the worst conditions for unlimited time and without any degradation of performance.
THE AMBIENT TEMPERATURE.
Electric machines are characterized by energy losses produced during energy transformation, which occur in the form of heat. The cooling of an electric machine occurs through the phenomenon of transmission of the heat produced inside to an element at a lower temperature, according to the principles of physics.