Power (KVA) Supplied by Electricity Boards consist of Real Power (KW), which Produce energy & reactive power (KVAR) generated by Inductive Loads, which decreases the loading capacity & the efficiency of the Supply System. The Power Factor (PF) is defined as a ratio between the Real Power & the Total Power.

Electricity Boards charge heavy Penalty to H.T. Consumer, if the Power Factor of the system is below a required minimum average value. Power Factor of the System can be improved by switching Capacitors as per KVA demand with the help of Automatic Power Factor Controllers.


Modern Industries use Large Nos. of AC Motors, DC Drives, Rectifiers, Invertors, Compressors, Inductive Furnaces and Welding Machines, causing poor Power Factor of the System. The Reactive Power requirement in such Industries varies rapidly within every few cycles. The response speed of the conventional Power Factor Controller is not suitable to take care of rapid switching cycle. The Conventional Power Factor Control System incorporates Electromechanical Switches to Switch Capacitors and or not suitable for Fast switching where the load is rapidly changing.

Also fast switching of Capacitors and Contractors results in inherent stresses on the Capacitors and on the Switchgear components.

Uncompensated reactive power leads to poor Power Factor. Voltage instability, flickering, high current consumption, increased Maximum Demand, high losses, low electric supply, loading capacity and overrating of switchgears & cables results in high wear and tear and high maintenance cost.



Jaivic Thyristorised Automatic Power Factor Correction System is a modern Powerful System constituting a Technological Breakthrough in the field of Power Factor Control.

This new Modern System utilises Electronic Switching Element that switch Power Capacitor Banks into the new worth without creating switching transients. Connection to the network is performed with the help of ‘ZERO-CROSSING Detector’, providing smooth connection to the Capacitor Banks. There is no limit to the no. of switching operations, since the Electronic switching elements do not wear out or deteriorate during the switching process.

Technical Comparison :

Contractor Switching

  • Network Compensation at extremely low voltage is not passible.
  • Welding of the contactor contacts due to high inrush currents resulting in dangerous over compensations.
  • Repeated and momentary Short Circuit currents due to capacitor Switching will have impact on the Life of the transformer.
  • Contactors and Capacitors deteriorate in performance, resulting in down time and non availibility of compensation.

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  • img/ht_shunt/thyristorised-APFC-panel-nashik-india.jpg

Thyristorised Switching

  • Compensation at extreely low voltage is possible.
  • No over compensation, under compensations and unbalanced compensation.
  • No inrush current. Distribution transformer never subjected to short circuit current, life of the transformer increases.
  • The Capacitor bank unit remains in useful operational service with maximum up time.

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  • img/ht_shunt/thyristorised-automatic-power-factor-correction-panel.jpg

  • img/ht_shunt/thyristorised-APFC-Nashik-india.jpg

Advantages :

  • On-line Power Factor Correction.
  • Fast Correction time Selectable
    - up to 100 ms
    - Cycle to Cycle
    - 2 Sec. / 2 min. (Optional)
  • Zero Switch on Surge Current.
  • Zero Differential Voltage Switching.
  • Switching Devices Rating suitable for upto 50% THD.
  • Increase in Life of Capacitors.
  • Protection against System Resources.
  • RS232 Serial Interface useful for Data Logging Application.
  • Avoids Distribution System Deterioration.
  • Transformers Self Inductive Load Compensation by pre-preprogramable kVAr value.
  • Suitable for Unbalanced Load.
  • Loca/Remote Data Logging and Printer Interface.
  • Programmable Settings for Tripping under Fault Conditions like –
    - Capacitor Shorted
    - Capacitor Earth Fault
    - Load Over Current
    - Load Imbalance etc.
    - Wrong Phase Sequence
  • 100 % Depreciation.