Constant Voltage Transformer

These are basically servo stabilizers except for certain design aspects like very fast speed of correction and good normal and common mode noise suppression. Also they takes care of small dropout in the power for a few tens of milliseconds. They can be used for sophisticated electronic and electrical equipment like Data processing equipments, elecro-medical equipments, electronic typewriters, Telecom, VCR’s, PA systems, R&D labs etc. The typical specification for a CVT are given below:

Input Voltage: 180 – 260 V, 50 Hz, single phase.
Output Voltage: 230 V (Taps at 220 & 240 V)
Response time: Within 3 cycles.
Load regulation: ±2 %.
Efficiency: More than 85 %.
Harmonic content: Less than 5 %.
Overload: Voltage start drooping after rated load.
Short Circuit: Short circuit currents are less than 2 times rated current.
Waveform: Sine wave.
Insulation Resistance:Greater than 500 MΩ.

The following precautions may be taken for the installation and operation of CVT:

  1. CVT should be kept in well ventilated place approximately 1 to 3 m away from the equipment.
  2. Earth should be properly grounded.
  3. The CVT should be made ON first and made OFF later, than the equipment.
  4. Do not put audio or video cassette on CVT or they may get erased.
  5. CVT should not be operated with generators which do not have frequency controlled output of 50 Hz ±3 %.
  6. Do not put anything on the top of the CVT to allow for proper ventilation.


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