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Home » Energy saving » Change PF of pump motors with soft starter
Change PF of pump motors with soft starter
I have 3 pumping motors of 1750 kw 6.6kv, with soft starter they are maintaining a power factor (PF) of .96-.97. Now I want to install HT capacitors to use these motors in d.o.l, can I take the power factor to .99 using this?
The short answer is no. You are comparing apples and oranges. PFCC and VFDs are not a substitute for each other. The capacitors do not save energy per say, they may save money in billing, if you are paying penalty on pf or demand charges. The "energy" consumed will not change just because of the caps.
Variable frequency drive can save energy consumed, if the load is of varying type that can be matched by varying the motor rpm. Regulating speed of motor also provides better control and energy savings vs. say using valve throttling.
In the end you have to run a cost, benefit and ROI (return on investment) analysis to verify suitability of any options. Before that get the technical facts right.
There are many considerations before changing. If you direct line start how does that impact breaker settings/protection and motor saver type systems as well. The capacitors may improve line voltage but not likely affect your metered load unless you are suffering from sharp p.f. penalties. If you have .96 power factor now I doubt the penalty is too steep. Need to run a cost benefit analysis for some limited losses savings but I believe the changes due to a bolted start will cause greater impact than you might experience with soft starter. Check with your utility as well. They may have sized their circuit based on your soft start.
The short answer is no. You are comparing apples and oranges. PFCC and VFDs are not a substitute for each other. The capacitors do not save energy per say, they may save money in billing, if you are paying penalty on pf or demand charges. The "energy" consumed will not change just because of the caps.
Variable frequency drive can save energy consumed, if the load is of varying type that can be matched by varying the motor rpm. Regulating speed of motor also provides better control and energy savings vs. say using valve throttling.
In the end you have to run a cost, benefit and ROI (return on investment) analysis to verify suitability of any options. Before that get the technical facts right.
There are many considerations before changing. If you direct line start how does that impact breaker settings/protection and motor saver type systems as well. The capacitors may improve line voltage but not likely affect your metered load unless you are suffering from sharp p.f. penalties. If you have .96 power factor now I doubt the penalty is too steep. Need to run a cost benefit analysis for some limited losses savings but I believe the changes due to a bolted start will cause greater impact than you might experience with soft starter. Check with your utility as well. They may have sized their circuit based on your soft start.
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