| THYRISTOR SWITCHED FAST RESPONSE P. F. CORRECTION SYSTEM. |
CONVENTIONAL CONTACTOR SWITHCHING P. F. CORRECTION SYSTEM. |
| 1 |
Load P.F. correction is quick and consistently near to the set value. Total P.F. correction is achieved within few hundred milliseconds... |
P.F. correction is slow. Total correcion takes few minutes. |
| 2 |
Fast P.F. correction reduces maximum demand of the load hence reduction in MD charges. |
Solw response P.F. correction is not as effective in reducing maximum demand. |
| 3 |
Capacitors are swithed through thyristors at zero current cross over threshold. Hence the capacitor connection to the mains is smooth, transident free and absolutely without generation of harmonics and voltage spikes. |
Contactor swithching creates high magnitude draw high inrush current affecting sensitive electrinic equipment connected in the network. |
| 4 |
Thyristors are maintenance free devices with very long life. Those are rugged and designed for unlimited switching operations. |
Contactor life is very poor for capacitor duty. Those require regular maintenance and replacement of conaccts. |
| 5 |
Very long capacitor life, since those are switched at Zero current crossing threshold and without and high inrush current at the time of switching |
Short capacitor life. |
| 6 |
MPP capacitors can be used without compromising with life. Those have very low dielectric losses, hence the running cost is low. |
Low loss MPP type capacitors give very poor life. Heavy duty capacitors like Mixed dieletric, give good life but are costly and running cost is high due to more dielectric losses. |
| 7 |
Transformer and other distribution equipment work with better efficiency due consistent good power factor, resulting in marked reduction in ELECTRICITY BILIS |
This advantage is not available. |
| |
LC circuits are de-tuned to avoid resonance. |
It is possible, but the maintenance cost increases due to switching of LC circuits. |
