technical NOTES

S. N. Particulars Conventional System VFD Concept

System Power Factor Average 0.85 P. F Nearer to Unity P.F.(0.95)

3 System Installation & Commissioning

System Installation &

Commissioning Time

Large time required, as more

hardware’s in the system

Less time required,

as less hardware’s in

the system

4 Inventory Cost

Spares Spare Fluid Coupling & its accessories VFD Control Cards /module

5 Operation & Maintenance

System reliability Less Efficient More Efficient

Breakdown

probabilities

High due to Mechanical Fluid

coupling Failure

Less compared

to Conventional

system as direct

drive

System Further

optimisation margin Not possible Possible

14.5 Investment and Power Cost Saving Calculation

14.6 Conclusion & Recommendation:
Based on above comparison & less investment cost for VVVFD. It is recommended
with following advantage:

• Reliability of equipment increased.


• Whenever production to be increase by 10% can be done.


• Smooth start of the system.

S. N. Particulars Cost in Lacs

1 Investment against VFD concept 119

2 Investment against conventional concept including Fluid coupling and conventional electrical feeder cost 175

3 Less investment due VFD concept 56

4 Less Power cost due to VFD concept 164

Capital Investment Savings

5 Total Less investment due to VVFD consideration 219