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Automatic Phase Selector

Automatic Phase Selector


Industries require three phases power to run their machinery. Some of them require continuous \ uninterrupted power to maintain their data. We introduce auto phase selector unit for those equipment whose supply is single phase. The single phase supply is selected automatically from three phases supply.

The objective of the APS is to ensure that there is continued commercial power supplied to the site at all times so as to ensure that the Base Transceiver Station (BTS) runs on commercial power until all available phases are either out of electrical tolerance or completely off. This is a micro controller based unit and is used with three phase electrical supply. Whenever the supply of one or two phases of a three phase electrical line goes off, the APS system automatically distributes the electrical supply from the active phase to the failed phases. This ensures continuous power supply through all the three phases even if one phase is active.

The user can operate this system in Auto and Manual Mode. In auto mode the phase is automatically selected by the controller so there will be continuous uninterrupted supply to the unit.

In manual mode the user will select which phase he wants.

A Microcontroller based system will continuously monitor the incoming phase and accordingly display the details on an alphanumeric LCD also it will display the output phase.

Technical Specification

  1. It monitors all three phases and pass one of them.
  2. It displays all available phases on LCD
  3. One LCD and Keypad with three keys are provided for input from user.
  4. If a phase ® is disconnected. New phase (S/T) will select at once and remain connected.

Block Diagram:

Automatic Phase Selector

Text Books:

  1. Muhammad Ali Mazidi –“THE 8051 MICROCONTROLLER AND EMBEDDED SYSTEMS”, Pearson education,




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Written by Amol Shah

Amol Shah

Founder of DNA Technology an Electronic Engineer by choice. Started working on this website as an Hobby and now its a full time venture. Very passionate about Electronics and like to learn new stuff. Want to make DNA Technology one of the best Online Store for Electronics Components in India.
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