
Addition of pf correction - useful to whom?
#1
Posted 15 July 2006 - 11:11 AM
in one of the posts, u had said that addition of power factor correction equipement is of no use
to the user,since the KWh meter readings are based on actual KW consumed.
Then it should be of some use to the power supply compnay since they insist on PF correction?
Of wat use, is it to them?
Regards,
bala
#2
Posted 15 July 2006 - 07:39 PM
Correcting the pf then can have a benefit for the user, IF the utility charges them a penalty or surcharge for poor power factor.
#3
Posted 15 July 2006 - 08:27 PM
The addition of power factor dorrection will not reduce the KWs consumed by the load. I will reduce the reactive current upstream of the capacitors and will therefore reduce the line and transformer losses supplying the circuit up to the power factor correction.
The major advantage is to the power company supplying the power, but if there are significant line losses within the plant on the supply side of where the capacitors are connected, there can also be some KW reduction as well. If there is significant KW reductionwithin the plant, the cable used must be well undersized.
In some circumstances, the cable from the supply to an individual motor may be too small, resulting in significant voltage drop to that motor. This will icreases the line losses to that motor and reduce the voltage supplied to that motor. The addition of static correction may reduce the voltage drop at the motor terminals. This will reduce the current drawn by that motor.
Where a customer has their own transformers, the addition of power factor correction can increase the maximum load that can be connected to a transformer. Transformers are loaded by KVA, not KW.
Best regards,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#4
Posted 16 July 2006 - 07:00 AM
Pls explain... thnx U
#5
Posted 16 July 2006 - 08:06 AM
The MW meter is sensitive to the current times the voltage times the power factor. If you improve the power factor, the current will drop but the power will stay constant.
For example, if you have a power factor of 0.5 and then correct it to 1.0, you will halve the current, halve the MVA, but the power will be the same. The meter will record the same power consumption.
Best regards,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#6
Posted 16 July 2006 - 01:17 PM
I have observed that when I online say, 7.5Mvar Capacitor Bank some 70kms from my station (along the transmission line), it has a corresponding increase of around 2Mw on my Mw meter, also a 2kV voltage improvement. This is a 69kV transmission line.
thnx u....
#7
Posted 16 July 2006 - 10:28 PM
It really comes down to the way that you are charged for your supply. Having a high p.f. will not make your equipment operate any better (besides a reduction in losses) but it could be costing significant money.
Cheers
Ken
#8
Posted 19 July 2006 - 12:34 PM
Hello marke,
in one of the posts, u had said that addition of power factor correction equipement is of no use
to the user,since the KWh meter readings are based on actual KW consumed.
Then it should be of some use to the power supply compnay since they insist on PF correction?
Of wat use, is it to them?
Regards,
bala
hi everybody,
i m new to this forum
you all can get knowledge about the power factor improvement just palying with the power vector diagram..
for supplier: supplier wants to supply more n more active power at good pf..n it can get by just reducing the reactive power n increasing the active power while keeping the constant apperant power.so supplier can supply more active power at good pf and can get good revenue...but reactive power is always there so power factor at supply end cant be unity.
for end user: if supplier poses penalty on consumer for poor pf..then consumer can use capacitor bank to improve power factor...again u can play with power vector diagram..keep active power constant n decreases the reactive power...n in that case you can improve the power factor up to unity...i think so
....
thanx n regard
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