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Choice of a Voltage Stabilizer
Generally speaking, a stabilizer can be chosen on the basis of a few elements:
1. NUMBER OF PHASES
1. Number of phases
The stabilizer number of phases depends on the type of load: One 1-phase load: 1-phase stabilizer Combination of several 1-phase loads or 3-phase loads: 3-phase stabilizer or a 1-phase stabilizer on each load. 3-phase load: 3-phase stabilizer
2. Rated voltage
Always detect the nominal voltages that are supposed to be present at the input and at the output of the stabilizer. In case of 3-phase systems, provide with the line-to-line voltage value.
Since there are different nominal voltages around the world, do not assume that YOUR nominal voltage is automatically known.
The standard voltage stabilizer can operate with the following rated voltage:
3. Input variation range
It's a key information for the choice and the design of the stabilizer. Establish the nature of the oscillation of the input voltage and always keep a safety margin on such percentage. The standard production can include stabilizers for symmetrical and asymmetrical input variation range. If the input voltage variation goes beyond the rated range, the difference between real and rated variation is transferred onto the output.
For example: Rated input variation ±15% rated output accuracy ±1%
abnormal variation ±20% output accuracy ±6%
4. Type of regulation
The three-phase voltage regulation can be performed in two different ways: independently on each phase. Used for 3-phase loads and 1-phase loads with until 100% unbalance and unbalance input voltage rated. In this configuration the voltage stabilizer requires the neutral wire presence.
averaged on the three phases. Used for 3-phase loads and 2-phase loads with 50% maximum unbalance and balance input voltage rated. In this configuration the voltage stabilizer does not require the neutral wire presence.
5. Rated power
Establish the power required to supply your load system and consider an extra safety margin for a
possible future expansion.
A voltage stabilizer power is expressed in kVA (kilovoltamperes), whilst load power is often given in kW
(kilowatts). The link between these two measuring units is provided by the power factor (cosj):
Remember the following:
kVA = load voltage x load current (single-phase)
kVA = x phase to phase load voltage x load current (three-phase) If the power factor or the load power in kW cannot be easily established, measure the absorbed currents in order to allow for a correct design of the stabilizer. All the stabilizers are designed for the maximum input current.
6. Installation
In order to provide with the best machine, it is recommended to inform about the installation condition. It is necessary to know:
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IP protection degree
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Indoor or outdoor installation
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Installation site altitude and climatic properties
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Ambient temperature
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Possible environmental hazards such aggressive atmosphere, exposure to chemical components and so on.
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