Well researched and documented real-industry live case studies covering a wide rage of Industries and PQ issues from Asia on harmonic distortions, under-voltage and over-voltage, voltage dips, sags, flicker/sag/swell, transients, earthing, reactive compensation and so on , are available here for downloading. The case studies offer detailed analysis of the PQ issues ad solutions including economic analysis to enable users and top managements to readily go in for implementable economical solutions.
With rising cost of energy and environmental concerns, energysaving is need of the hour. In order to reduce operating cost installation of variable frequency drive on variable load is proven energy saving measure. VFDs in market are generally based on six pulse rectification topology. Due to the fact that these VFD’s convert frequency to change speed, generation of harmonics cannot be avoided.
A leading hospital in southern India faced chronic problems in terms of humming noise in capacitor bank, its failure, high temperature in transformer, and disturbances on the monitor of ultra sound machine. In order to rectify these problems hospital management carried out power quality study.
An engineering company in western India opted to address power quality issues in the green field project. For a heavy engineering company engaged in manufacturing of turbine power quality becomes very important as the raw material is very costly. Apart from using costly raw material the process is very critical and time consuming.
A large Industry involved in the melting of iron for making castings and machining them uses the Induction furnaces as well as other equipment. The industry desired the Institute to undertake power and energy audit studies of their plant during 2010?11 period. The 110KV grid power supply to this industry is through 2 numbers of 12.5 MVA transformers feeding nearly 10MVA loading of Induction furnaces with medium frequency inverter, a non linear load producing high level of harmonic currents.
A booster pumping station (BPS) in South India with high power HT pumping motors reported sudden failures due to flashover of the current limiting reactors of the PF correction capacitor circuit. The pumping circuit has its own power factor correction capacitor circuits. The failures were reported repeatedly over three/ four days during December 2009.
Wind mills are increasingly becoming an alternative generating source to fulfill the ever increasing need for electricity in India. Indians currently fifth largest country in the world in terms of wind generating capacity concerned. Critical issues affecting their performance such as power quality could impact their vital contribution to the power sector.
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