FACTS (Flexible AC Transmission) by TSR

Model: 244

Solderable DIY project kit for Engineering & Diploma students

Product of choice for Engineering & Diploma students worldwide.

Do-It-Yourself Kit :

Includes complete hardware comprising of discrete components, modules, PCB, controller etc. and tested program code for building the project. Extensive documentation for project execution including step-by-step instructions for Circuit building, Assembly procedure and Troubleshooting. (Tool kit-Multimeter, Soldering iron and program burner not included in the kit)

Rs.4,999.00 Rs.3,749.00



The project is designed to implement FACTS by TSR (Thyristor Switch Reactance). This method is used either when charging the transmission line or when there is very low load at the receiving end.

Due to very low or no load, very low current flows through the transmission line and shunt capacitance in the transmission line becomes dominant. This causes voltage amplification (Ferranti Effect) due to which receiving end voltage may become double than the sending ends voltage (generally in case of very long transmission lines). To compensate this, shunt inductors are automatically connected across the transmission line.

In this proposed system the lead time between the zero voltage pulse and zero current pulse duly generated by suitable operational amplifier are fed to two interrupt pins of the microcontroller, where the program takes over to bring the shunt reactors to the circuit to get the voltage duly compensated.

Back to back SCRs duly interfaced through optical isolation from the programmed microcontroller are used in series for switching the reactor (in our case a choke is used). The microcontroller used in the project is of 8051 family.

Further the project can be enhanced by using firing angle control methodology for smooth control of the voltage. Thus, this is better than switching reactors in steps where voltage control (also in steps) is not very precise.


Easy to use, Self-explanatory kit.

All-inclusive solution kit.

Extensive audio-visuals available.

Branding-free material.

Pre-programmed Microcontroller.

Thyristor based APFC.

Call/mail for Tech Support from 10 am – 7 pm.

Can be Customized for Arduino, Raspberry Pi, PIC


Hardware Requirements

  • 8051 series Microcontroller
  • Op-amps
  • LCD
  • Shunt Capacitors
  • SCR
  • Opto-Isolator
  • Current Transformer
  • Choke
  • Crystal
  • Slide Switches
  • Resistors
  • Capacitors
  • Diodes
  • Transformer
  • Regulator
  • Lamp

Software Requirements

  • Keil compiler
  • Language: Embedded C or Assembly

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