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kVAHr Saving


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#1 Guest__*

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Posted 21 January 2005 - 10:03 AM

Hi,

kWHr is a part of kVAHr. How can there be no change in kVAHr when there will be change in kWHr, since the PF at Meter end remain constant?

If capacitor bank has to reduce its load, what would be the impact on saving?


Thanks.

#2 marke

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Posted 22 January 2005 - 07:35 PM

It is certainly possible to change the KVAHr without changing the KWHr. If you have a load with a lagging power factor and add power factor correction, the KWHr will remain unchanged, but the KVAHr will fall. The power factor will also improve.

If you have a motor with a smal load, the change in load will affect the KWHr but have very little impact on the KVAHr. The KVA is the vector sum of the resistive power and the reactive power. If the reactive power is significantly larger than the resistive power, small changes in the resistive power (KW) will not show up in the KVAHr.

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#3 Guest__*

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Posted 12 July 2005 - 07:37 AM

we often come to see that power supplying companies donot send the power at improved power factor to the domestic consumers .is it not feasible to improve the power factor ? or it is not economical

#4 marke

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Posted 12 July 2005 - 10:48 AM

The power supply companies do not supply power with a poor power factor. Power factor refers to the ratio between the KW and KVA drawn by the consumer. It is not related to the supplier.
Domestic loading is primarly resistive and electronic. There is very little inductive load in the domestic situation so there is no advantage in power factor correction. There is however, a reasonable amount of electronic load which contributes to distortion power factor. It is best to keep quiet about this as we do not want the power companies to add a surcharge for harmonics!!

Best regards,




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