IREM PROPOSAL
VOLTAGE STABILISERS
Ministab – Sterostab
LINE CONDITIONERS
Ministatic – Steroguard
INTEGRATED POWER SUPPLIES
AI – AO
ISOLATION TRANSFORMERS
ITT – IT
PASSIVE FILTERS FOR HARMONICS
PHF – LIF
PASSIVE FILTERS FOR MOTOR PROTECTION
VTF – SWF
UNINTERRUPTIBLE POWER SYSTEMS
Minipower – Steropower
VOLTAGE DIP COMPENSATOR
STEROCOMP
VOLTAGE OPTIMISERS
Ecostab – Ecobuck
POWER QUALITY
There is no formal (or univocal, academic, etc.) definition of the term “Power Quality”, however it is customary to refer to “Power Quality” such as the suitability of electricity to power the user appliances.
“Power Quality” is intrinsically linked to the interaction between the electrical system power supply and loads; the term refers both to the voltage quality and the current quality.
Any deviation from the ideal power conditions manifested in voltage, current or frequency
deviations – which is the cause of failure or malfunction of a powered equipment – constitutes a problem of “Power Quality”. Poor Power Quality inevitably causes problems to motors, drive devices, lighting systems and computer networks.
Many users of process plants and equipment underestimate the effects of poor “Power Quality”, which in terms of downtime, lack of productivity, data loss and damages to the equipment can be truly remarkable.
A reduced “Power Quality” can also give rise to unexpected high electricity costs and cause the application of penalties due to power supply network pollution.
Users with internal power quality problems, responsible for the network “pollution”, end up damaging other users connected to the network node and adversely affect the ability of substations to meet the quality requirements of the power supply.
The interdependence between the different systems only increases the vulnerability of the equipment to Power Quality problems, every plant and every company also have strategic systems for their business and any Power Quality problem can determine their interruption of operation at any time.
A wide range of devices is available to improve the power quality and ensure the best protection to professional equipment highly sensitive to electrical disturbances. As a matter of fact, any equipment needs a correct powering to ensure its performance. When this condition is not complied with, there are failures, errors and premature ageing.
To protect sensitive equipment, it is possible to have recourse to several devices which, depending on their characteristics, complexity and cost, ensure different levels of efficacy. The choice should be made by assessing the degree of protection required, the entity of failures and the direct and indirect costs these may cause. It is therefore useful to know the most common electrical faults in order to adopt the most adequate protection and avoid ine¡ciency and failures.
PROBLEM: MAINS FAULT
SOLUTION: IREM
SYMMETRICAL VOLTAGE VARIATIONS
Distribution lines, being subject to continuous load variations, cannot guarantee a constant voltage.
Electrical equipment usually operates correctly within a tolerance of at least ±5% of the nominal value.
In fact, power suppliers contractually allow for a variation of ±10%. However, this limit is often exceeded due to ‘slow variations’ (voltage drops caused by undersized lines and overloads), ‘overvoltages’ (signifi cant increases in the RMS voltage that occur when industries do not consume energy), and ‘rapid variations’ (voltage drops caused, for example, by the connection of loads such as discharge lamps, welding machines, large electric motors, etc.)
VOLTAGE STABILISERS
MINISTAB – STEROSTAB T
ASYMMETRICAL VOLTAGE VARIATIONS
Asymmetry, otherwise called voltage imbalance, is a problem affecting three-phase networks, it can cause serious damage to equipment, but is often overlooked. For example, a 2.3% voltage imbalance on a 400 V motor results in a current imbalance of almost 18%, causing a temperature rise of 30 ° C.
VOLTAGE STABILISERS
MINISTAB – STEROSTAB Y
VOLTAGE SPIKES
These are impulse disturbances of extremely short duration, which are dangerous for the most sensitive equipment as they can reach voltage levels of several thousand volts. They are caused not only by lightning but also by switching operations on high-voltage lines, the connection of power factor correction capacitors, and the disconnection of loads with high reactive power. Due to their short duration, they cannot be detected with a standard voltmeter and are one of the main causes of faults and malfunctions.
ELECTRONIC LINE CONDITIONERS
MINISTATIC – STEROGUARD
HIGH FREQUENCY DISTURBANCES
They are caused by sparking in commutator electric motors, the ‘corona effect’ on high-voltage lines, the starters of neon signs and burners, and the magnetic fi elds emitted by radio and television broadcasters.
Line noise, also known as HF NOISE, does not affect electromechanical equipment but is often harmful to electronic devices.
INTEGRATED POWER SUPPLIES
AI – AO
GALVANIC ISOLATION
This specific feature is used for electrical hazard protection, suppressing electrical noise in sensitive devices, attenuating impulse voltages, or, in general, transferring power between two circuits that must not be electrically interconnected while preventing the transmission of the DC component from one circuit to another. Isolation transformers provide galvanic isolation; there is no conductive path between the source and the load.
ISOLATION TRANSFORMERS
SERIE ITT – IT
HARMONICS
Harmonics in electrical systems are sinusoidal currents or voltages with frequencies that are integer multiples of the fundamental frequency of the distribution system. By superimposing themselves on the fundamental current and voltage, they cause waveform distortion.
The issues caused by harmonics are numerous and include equipment malfunctions, increased circuit currents, higher energy losses, and acoustic frequency interference, among others
PASSIVE FILTERS FOR HARMONICS
PHF – LIF
MOTOR POWER SUPPLY WITH VFD - VSD
Frequency converters, commonly used to regulate the speed of asynchronous motors, supply the motor with a non-sinusoidal waveform characterized by voltage peaks.
These power supply conditions place both electrical and mechanical stress on the motor, while also worsening EMC emissions and increasing acoustic discomfort.
OUTPUT FILTER
SERIE VTF – SWF
VARIABLE HARMONICS
Some nonlinear loads generate harmonic content distributed across a broad and variable spectrum in both order and intensity.
Their presence leads to a variety of both instantaneous and long-term eff ects on electrical equipment and installations
ACTIVE FILTERS
AHF
VOLTAGE INTERRUPTIONS
Although this phenomenon is less frequent, it is the most well-known because it is perceived by everyone. It can occur in production plants or distribution lines, or be scheduled for technical interventions.
Additionally, there are very short power losses, known as ‘microinterruptions,’ caused by short circuits or network switching, which can damage electronic equipment and lead to production downtime.
UNINTERRUPTIBLE POWER SYSTEMS
MINIPOWER – STEROPOWER
VOLTAGE DIP
A voltage dip is defi ned as a temporary, unpredictable, and random reduction of the supply voltage to a value between 90% and 5% of the nominal voltage.
The causes of voltage dips vary and can include faults in the power grid, malfunctions in electrical installations, and transient overloads such as the inrush current of large motors or the connection of high-power loads. A voltage dip propagates from higher voltage levels to lower ones, meaning that, in many cases, the load experiencing the issue is connected to a voltage level lower than where the dip originated.
VOLTAGE DIP COMPENSATOR
STEROCOMP
POWER QUALITY
There is no formal (or univocal, academic, etc.) definition of the term “Power Quality”, however it is customary to refer to “Power Quality” such as the suitability of electricity to power the user appliances.
“Power Quality” is intrinsically linked to the interaction between the electrical system power supply and loads; the term refers both to the voltage quality and the current quality.
Any deviation from the ideal power conditions manifested in voltage, current or frequency
deviations – which is the cause of failure or malfunction of a powered equipment – constitutes a problem of “Power Quality”. Poor Power Quality inevitably causes problems to motors, drive devices, lighting systems and computer networks.
Many users of process plants and equipment underestimate the effects of poor “Power Quality”, which in terms of downtime, lack of productivity, data loss and damages to the equipment can be truly remarkable.
A reduced “Power Quality” can also give rise to unexpected high electricity costs and cause the application of penalties due to power supply network pollution.
Users with internal power quality problems, responsible for the network “pollution”, end up damaging other users connected to the network node and adversely affect the ability of substations to meet the quality requirements of the power supply.
The interdependence between the different systems only increases the vulnerability of the equipment to Power Quality problems, every plant and every company also have strategic systems for their business and any Power Quality problem can determine their interruption of operation at any time.
VOLTAGE STABILISERS
MINISTAB AND STEROSTAB
Suitable for any type of load, they deliver a “true RMS” stabilised output voltage, even when strong harmonic distortions are present on the line.
MINISTAB – STEROSTAB M
Single-phase voltage stabilisers.
MINISTAB – STEROSTAB T
Three-phase voltage stabilisers with common regulation of the 3 phases.
MINISTAB – STEROSTAB Y
Three-phase voltage stabilisers with independent regulation of each phase.
LINE CONDITIONERS
MINISTATIC AND STEROGUARD
ELECTRONIC LINE CONDITIONERS MINISTATIC
These models offer a high protection level for sensitive electronic equipment connected to lines disturbed by voltage variations, high frequency interferences and voltage spikes.
ELECTRODYNAMIC LINE CONDITIONERS STEROGUARD
They ensure the highest protection level to high power sensitive equipment connected to electrical mains perturbated by voltage variations, high frequency interferences and voltage spikes.
INTEGRATED POWER SUPPLIES
AI – AO
They provide protection against various electrical phenomena and ensure the rational power supply of the radio transmission and telephone communication equipment.
The integrated power supplies can be installed at the base of the 19” rack cabinets widely used in the industrial, telecommunications and IT fi elds.
ISOLATION TRANSFORMERS
ITT – IT
They provide galvanic separation between the power supply network and the load, implement overvoltage protection, create the distribution system with isolated neutral and can also adapt the voltage to the functional values of the system.
PASSIVE HARMONIC FILTERS
PHF – LIF
AC-AC and AC-DC drives generate harmonics that ‘pollute’ the power supply.
These harmonics require mitigation to maintain an adequate power quality in the electrical network.
Harmonic fi lters reduce the total harmonic distortion (THD) of the current in variable speed drive applications and, in general, wherever a six-pulse rectifi er is used.
MOTOR PASSIVE FILTERS
VTF – SWF
Output fi lters ensure proper power supply to the motor, guaranteeing optimal performance.
These are low-pass devices that allow low-frequency signals to pass while attenuating or blocking high-frequency signals.
The fi lters convert rectangular pulse-width modulation (PWM) signals into attenuatededge voltage (VTF) or smooth waveform voltage (SWF).
By reducing stress on motor insulation and other mechanical components caused by voltage peaks, current leakage, and overheating, these fi lters help extend the motor’s service life.
ACTIVE FILTERS
AHF
The active fi lter is able to automatically eliminate the current harmonics present in the network within a wide range of frequencies. By exploiting electronic technology, it is able to introduce a counter harmonic system capable of cancelling those present on the network. The active fi lter has the advantage of simultaneously fi ltering dozens of different harmonics and does not involve design costs for sizing.
UNINTERRUPTIBLE POWER SYSTEMS (UPS)
MINIPOWER AND STEROPOWER
The double conversion on-line uninterruptible power supplies adopt PWM technology with IGBT and a latest generation microprocessor control. They guarantee high performance with perfectly sinusoidal output waveform.
VOLTAGE DIP COMPENSATORS
STEROCOMP SERIES
Many devices can withstand voltage dips due to their mechanical and electrical inertia; however, this is not the case for electronic equipment and relays used to control most automated lines, leading to signifi cant costs for product rework and plant restart.
The STEROCOMP series is designed to provide the correct power supply during voltage dips and effectively keep the system running in compliance with the Semi F47 standard.
VOLTAGE OPTIMISERS
ECOSTAB – ECOBUCK
IREM Ecostab Voltage Optimiser is a product dedicated to Power Quality and Energy Saving.
Voltage optimization is an energy-saving technology that, by operating through systematic and controlled reduction of the grid voltage, reduces the absorption of active and reactive power from the network.
The average voltage value of the distribution networks is often higher than the ideal operating value for most electrical equipment.
Ecostab is the Energy Economizer which, by exploiting the principle of voltage
optimization, increases the level of power quality and produces energy savings measured and quantified
according to the international reference standard.
HIGHLIGHTS
WARRANTY
5-year extended warranty for voltage stabilizers and power conditioners with IP21 protection degree.
RELIABILITY
The criteria used to size the electrical and electronic components of all IREM products guarantee high reliability.
The declared performances always refer to the most severe and restrictive conditions of use: continuous duty at nominal power with minimum input voltage and maximum ambient temperature.
NATURAL CONVECTION
In equipment with IP21 degree of protection, cooling is obtained only by natural convection in air. The total absence of fans (IREM fan-free system) significantly increases the reliability of the product by avoiding the use of filters that require constant maintenance.
FIT & FORGET
IREM products are characterized by long life, absence of degradation of performance over time and reduced need for maintenance, thanks to the robust construction and the high quality of the materials used, which determines an extremely high reliability (MTBF).
WIDE RANGE
Single-phase and three-phase voltage stabilizers with powers between 1kVA and 8000 kVA. Voltage range from 110 V to 500 V. All voltage stabilizers are available in symmetric configuration ±10%, ±15%, ±20%, ±25%, ±30% and in asymmetrical configuration -35% +15%. Other configurations are possible on request.
TAILOR MADE
The whole range of IREM products 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 equipment 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.