BTS series


Standard features

Number of phases 1 3 3-1
Output voltage* 220-230-240V (L-N) 380-400-415V (L-L) 380-400-415V (L-L) input
220-230-240V (L-N) output
Nominal rating from 5kVA to 80kVA
Input voltage range ±15% – ±20% – ±25% – ±30% – +15%/-25% – +15%/-35% – +15%/-45%
Output voltage range ±0.5%
Frequency 50 ±5% or 60Hz ±5%
Admitted load variation Up to 100%
Admitted load imbalance n.a. 100% n.a.
Cooling Natural air ventilation (air extraction over 35°C)
Ambient temperature -25/+45°C
Storage temperature -25/+60°C
Max relative humidity 95% (non condensing)
Admitted overload 200% 2 min.
Harmonic distortion None introduced
Colour RAL 7035
Protection degree IP 54
Installation Outdoor
Overvoltage protection Class II surge arrestor

* The output voltage can be adjusted by choosing one of the indicated values.
Such choice sets the new nominal value as a reference for all the stabilizer parameters.

The acronym BTS stands for Base Transceiver Station and is used to indicate all the transmitting and receiving devices that enable the radio coverage in a telecom cell.

This is definitely an application where high quality voltage supply, regardless of the incoming fluctuation, is very often the key for ensuring efficiency and reliability, fundamental qualities to guarantee operating continuity.

Disrupted service, loss of data, security failure, inaccurate information and general inconvenience are examples of possible problems caused by unstable supply. Of course, all this results in increased costs. A voltage stabilizer is a device able to respond to changes in the voltage level on the input line caused by sags (due to undersized distribution lines, connection of large loads to the network, ground faults, etc.) and surges (generated by disconnection of large loads, increased voltage at the generating plant, atmospheric events, etc.) The duration of such phenomena depends on their cause and is not easily predictable. Sags are generally more common especially where the distribution is not efficient.

The voltage stabilizer specifically designed for BTS sites has proved to be an efficient solution in the telecommunication field.

In comparison to a standard voltage stabilizer, a BTS unit offers the following characteristics:

  • IP54 metallic enclosure for outdoor installation.
  • Manual by-pass.
  • Input and output circuit breakers.
  • Input digital voltmeter.
  • Output Class II surge arrestors.
  • Optional isolating transformer.

The stabilizers can be single-phase, three-phase or specifically designed for receiving a three-phase input and releasing a single-phase output. With the three-phase configuration, the regulation is performed independent on each phase and the voltage stabilizer requires the neutral wire presence for a correct operation. If the neutral wire is not available, the addition of a D/Y isolating transformer or neutral-point reactor is required.

Three-phase stabilizers can be used with three-phase loads and up to 100% unbalanced single-phase loads, even in case of asymmetric mains.

The instrumentation is installed on the cabinet door. An output digital multimetre provides with information on the line downstream the voltage stabilizer (phase and linked voltages, current, power factor, active power, apparent power, reactive power, etc).

Minimum voltage, maximum voltage, internal overheating and overload on the voltage regulator are signalled by an acoustic alarm.

The stabilizer exploits a microprocessor-based control logic.

Main features
  • Power design based on the maximum input current.
  • Regulation based on the «rms voltage» and insensitivity to harmonics on the mains.
  • Full functionality with load charge variable from 0 to 100%.
  • Up to 30% harmonic content admitted on the load current.
  • Insensitivity to the load power factor.
  • No generation of noticeable harmonics in the output voltage.
Protections and signals
  • Motor rotation stop due to regulation reaching the limit switches.
  • Maximum and minimum line voltage alarm.
  • Ambient thermostat (set to 65°C).
  • Automatic circuit breaker to protect the voltage regulator.
  • Fuses to protect the auxiliary circuits.
  • Class II surge arrestors.

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