Difference in power factor in sending end and receiveing end
Difference in power factor in sending end and receiveing end
(OP)
We have 132/11KV substation .One meter of EB is connected at sending end of 132KV voltage and our meter is connected at receiveing end 132KV voltage .Even though we are maintaining average power factor of receiveing end 132KV voltage around 0.92 but the average power factor of sending end is low around 0.84 .Why such huge difference in average power factor occurs .We have already checked both end meters but no fault found .I am not able to understand why such difference is coming .Also during running condition running power factor on both side is same .






RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
That could be explained by a relatively small active power component.
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
Is this a cable circuit or a line?
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
My crystal ball is broken. The OP needs to provide more detail.
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
It is a clear maths. The penalty what you pay could be due to a loophole in the power agreement. Normally, when the EB (Electricity Board?, Utility supplier)supplies you the bulk power at EHV, you shall define the location of Point of Common Coupling (PCC). Normally, it is in the customer premises. If you have agreed the PCC somewhere far away from your premises, you are getting penalised, which could be avoidable, by reviewing the tariff metering location and moving the same to PCC.
I am sure presently you are also paying for for the line losses.
RE: Difference in power factor in sending end and receiveing end
If there's a capacitance involved, cable or overhead or otherwise, and very low load, this makes sense. But, if this is a line with normal load, it doesn't make sense at all if there is not a rather high reactive component in the transmission line.
My questions: Is the PF capacitive or inductive? How heavily is the line loaded?
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Difference in power factor in sending end and receiveing end
Load: 111 MVA, pf 0.92
Line: 100 km, modeled in 10 sections. X = 0.44 Ohm/km, R = 0.09 Ohm/km, B = 7.7e-5/Ohm km (realistic, or typical ? )
With these parameters the pf = 0.84 at the source and pf = 0.92 at the load.
See the attached picture.
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
The question is - why is the instantaneous pf the same, but the sending end average pf lower? Could be explained by the average load being higher on average than when the instantaneous metering was read.
RE: Difference in power factor in sending end and receiveing end
Is it not the case that customer charges are always calculated at the point of common coupling? If so, the customer's power factor [iow @ the receiving end] should be the determinant; providing the customer can prove it, being billed for reactive power that flows into said [express?] circuit without the customer's consuming it would provide legal grounds upon which the customer could IMHO take the supplier to court for overcharging.
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
From “Transformer Costing with Customers” by HydroOttawa co.
“Section 3, of the Distribution System Code, allows for the LDC (local distribution company) to charge for dedicated distribution transformer(s) for commercial and primary supplied residential services. This procedure focuses on the costing details associated with distribution transformer(s) and their sole use by a customer. This discussion does not apply to Hydro Ottawa owned transformers for multiple customers on the public road right-of-way or easements. Rental of Hydro Ottawa substation class transformers shall be reviewed separately on a case-by-case basis.”
So, if the transformer it is your property then the kWh-and power factor-has to be measured at high voltage supply side of the transformer[132 KV].If the load at 11 KV it will presents 0.92 power factor at 132KV will be 0.84.[Let’s take a 100 MVA transformer, 12.5% impedance, 60% loaded]
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
RE: Difference in power factor in sending end and receiveing end
I'm not saying it would be wrong, either; there is however a difference between what the quote describes and being unfairly gouged by one's supplier...and it is unclear to me based on the info provided whether or not that's what's happening in this case...which is what civil courts are helpful with.
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]