Power factor correction
medium voltage

ZEZ SILKO Ltd. is a significant producer of power capacitors, capacitors for power electronics, induction heating capacitors, automatic capacitor banks and other products in the Czech Republic.

ZEZ SILKO Ltd. provides complete service in power factor correction and power system evaluation included harmonics (measurement of the network parameters, preparing specifications, manufacturing equipment and delivery to customers).

Tradition of this production in the Czech Republic dates back to 1930. Nowadays the firm has up-to-date production technology and quality control system according to standards ISO 9001. Therefore the company has been using only non toxic, ecological insulation materials.
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POWER FACTOR CORRECTION

Many electrical devices, equipments and systems needs an electromagnetic field for their standard operation. This physical necessity leads to a consumption of reactive power which is used to provide basic function but not any active power. It means that transmission and distribution system is loaded with this reactive power and that’s not an economically effective use and therefore it’s penalized by electrical utility companies.

The solution is to use local power factor compensation to provide the required rective power from power capacitors directly to the appliance to avoid undesired load of the mains network. Systems with higher harmonics content may be sensitive to create resonant circuit between power capacitors and inductance of a transformer and may cause damage of an electrical system. The solution is to use detuned PFC which combines power capacitors with detuning reactors.

This detuned system shifts the resonance frequency to lower values (below first harmonic) where no harmonics are present so the safe operation of the whole system is ensured. Besides this such circuit has a certain tuning frequency that offers a filtering effect for the harmonic currents and thanks to this reduces the distortion level in the grid system. Note that detuning reactors and their inductance must be selected to match exactly capacitor capacitance to obtain the desired tuning frequency. Also note the capacitor is exposed to increased voltage than the nominal grid voltage in detuned PFC systems because of series connection with detuning reactor.