Sathish Arul

  ENERGY CONSUMPTION HT TARIFF LT TARIFF

DIESEL GENERATOR CHECKS TO BE DONE FOR DG'S A CHECK B CHECK    C CHECK D CHECK ALTERNATOR Q&A  

 APFC (CAPACITOR BANK) APFC Stands for automatic power factor correction/controller  Assume that your electrical  distribution system have the value of 100KVA,415V,240.96 Amps and PF is 0.8. If we want to improve the power factor from 0.8 to 0.99, you need to install the static capacitor in the existing  system.  There is a standard formula to calculate the required KVAR i.e.  KVAR =P(Tan pi 1 - Tan pi 2)  Let us assume Cos Pi 1 = 0.8                                    Pi 1 = cos inverse of 0.8                                   Pi 1 = 36.869  Also let us assume Cos Pi 2 =0.99                                        Pi 2=Cos inverse of 0.99           ...

  As per CEA Guidelines, those who maintaining the substaion in the voltage level of 11kV,22kV,33kV, they should maintain the total harmonic distortion as per the below allowable limit. Individual Voltage Harmonic Distoriton maximum acceptable limit is 3% Total Voltage Harmonic Distoriton maximum acceptable limit is 5% Total Current Harmonic Distoriton maximum acceptable limit is 8% The limit has mentioned by institute of electrical and electronic engineer (IEEE 519 2014) If THD is breaching the acceptable limit, then you have to install harmonic filter to maintain the level as stated by above standards, othewise government authority will impose the penalty. The Harmonic filter may be active harmonic filter or passive harmoic filter or hybrid harmoic filter.However, the selection of filter is based on your site load requirement.