Comparison between Fast response Thyristor Switched and Contactor Switched Capacitor A.P.F Correction Systems |
Thyristor switched fast response P.F. correction systems
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Conventional contactor switching P.F. correction systems
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Load P.F. correction is quick and consistently near to the set value. Total P.F. correction is achieved within few hundred milliseconds.
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P.F. correction is slow. Total correction takes few minutes.
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Fast P.F. correction reduces maximum demand more effectively, hence more savings on account of reduction in MD charges.
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Slow response; P.F. correction is not as effective in reducing maximum demand, especially when the load variations are fast.
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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.
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