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Power factor (again)

Johno12345

Sorry for yet another question on this topic.

 

I have got sub metering installed on all outgoing submains, I also have a meter on the incoming main

 

Between the main meter and sub meters, I have my power factor correction

 

over a week, I'm getting about 1,500kWh of difference, the sub meters total being higher by that amount compared to the incomer meter.

 

I'd like to say that the power factor correction has effectively saved that number of kWh, is that correct?

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    Ok Johno, can you supply the reactive power readings on the TX feed (overall) and after the PF corrector. I would expect the Tx to be very low (comparatively) as the PF reads 0.99. The readings on the outgoing feeders will show the reactive power and the total will be about how much you are saving. It may be about the 1500 kVAh you mention, presumably over a period, but a significant amount of money. The TX primary meter will be reading KVAh, and should approximately agree with the TX secondary meter, less 2-3% for TX loss etc. The PF correction could well be saving several hundred pounds over your metering period, and choosing a day for this would certainly help others understand the savings. Another saving may well come from the replacement of the main transformer, modern high-efficiency types may well save their cost reasonably quickly. Taking daily and hourly readings may also isolate more savings from the use of particular plant, or lighting loads that would benefit from changes or replacement.

    Regards

    David

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  • 0

    Ok Johno, can you supply the reactive power readings on the TX feed (overall) and after the PF corrector. I would expect the Tx to be very low (comparatively) as the PF reads 0.99. The readings on the outgoing feeders will show the reactive power and the total will be about how much you are saving. It may be about the 1500 kVAh you mention, presumably over a period, but a significant amount of money. The TX primary meter will be reading KVAh, and should approximately agree with the TX secondary meter, less 2-3% for TX loss etc. The PF correction could well be saving several hundred pounds over your metering period, and choosing a day for this would certainly help others understand the savings. Another saving may well come from the replacement of the main transformer, modern high-efficiency types may well save their cost reasonably quickly. Taking daily and hourly readings may also isolate more savings from the use of particular plant, or lighting loads that would benefit from changes or replacement.

    Regards

    David

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