Pragati Enterprises

Features:

• Load P.F. correction is quick and consistently near to the set value. Total P.F. correction is achieved within few hundred milliseconds.
• Fast P.F. correction reduces maximum demand more effectively, hence more savings on account of reduction in MD charges.
• Single and multi stage configuration
• Compensated and uncompensated filter
• Switched and fixed filter bank
• Capacitors are switched through thyristors at "zero current crossover threshold". Hence the capacitor connection to the mains is always smooth, transient free and absolutely without generation of harmonics and voltage spikes.

The basic purpose of Contractor Switched Automatic Harmonic Filter Panel is centralized Reactive Power Compensation with Harmonic Mitigation. Automatic control is provided using Automatic Power Factor Control relays. The switching of individual steps is through contractors or thyristors. With thyristor switching it is possible to have panels at higher voltages (upto 690 V), and with large size of single step (108-kVAR). Based on the load variation pattern, the minimum and maximum size of steps can be determined to maintain optimum power factor. These will help partly mitigate the harmonics from the system.