Load Calculation

Are the meters electronic and what may be accuracy. In the unlikely event if the billing is md related that may be a cause.Otherwise The mismatch appears to be on the higher side. Thorough calibration check will usually reveal the cause of error . If all the branch meters record as per estimated usage then the main meter may be suspect. A sample survey may also be done. At any specified time say 11 am ask 7 persons to note down the respective meter readings same instant. Again at say 12 and at 1,2,3 pm record meter readings.This is may appear naive but is very reliable unobtrusive and does not require special instruments.

thanks for your comments.meters are analog.

Check your accuracy class of submeters and main meters. Find out the general land lord load like pumps, corridoor lighting etc whichever out side the appartments. calculate the difference if within the tolerence as per calibration.

thanks .will follow your instruction when we will start the job tomorrow morning when the building will re-open after weekly holiday.all the building has been rented out to banks and one of the tenant has Servers supported by UPS of 70kva capacity.will furnish further complete technical details hopefully on 1st June 2010.

Accuracy of all meters will be checked tomorrow i.e 02/06/2010

Salahuddin Zia

You may also have significant losses in transformers to reduce voltages to usable levels.

I think in these points

1- Meters of all same class

2-Check your cabling any overloads /wiring

3-Is the previous load calculation is correct

4- There is extra Power loss between the main meter and sub meters

recheck it replace or repair it ...

Regards

Does the wiring look like this???????

No not at all

Salahuddin Zia

Measuring energy is easy, measuring contribution to electrical bill costs of each metered load is not. Better know what the difference is. Better know how your utility charges for power. Better know what kind of metering technology to use when getting contribution to costs. Better know the meaning of what I am talking about.

The following points may be checked.

1)Check whether the sub meters are electrmagnetic type and the main meter is electronic type. The errors in em type meters will be more and these errors are added up to make a difference like this.

2) check whether you have taken into consideration the common load metered seperately If not ,pl add this to the the total

But as per Indian electricity rules, only the local statutary body have the right to sell the power. So pl term it as occupants paying for the energy used metered by the main meter installed by GOVT.or else the individual meters to each premises is sealed and under the boards control with individual consumer numbers given by the board.

KT MENON

Thanks for your guide lines.the sub meters are not sealed.the owner is paying the electric bill to the GOVT. as recorded on the main meter

sounds like the goverment meters is cheating so the gov't gets extra $$, typical.

Get gov't meter checked.

Simple increase your KWH Charge by 30% and reap the rewards.

Cheers

Joe

thanks for the advise but really i am in no mood that my head is broken into 30 pieces by the 6 tenants.

Salahuddin Zia

I would be very curious to see the facts before I took on this project! 25% losses are significant. The original installation of the sub-meters needs to be checked thoroughly and then you have to question what kind of sub-meters are being used. The accuracy is in question......Let's say that the meters are all calibrated and checked.

I may take some time to measure actual KW usage of the individual flats. May be a design flaw in the meters. Check the spec's on the MAIN supply meter and have it calibrated by the city government. If you divide the 6 flats into the low 25% reading it seems that each meter needs to adjusted by at least 4%. The owner can just figure 4% on top of each tenants bill after discussing it with them!! Just thoughts.

well, I think the ratios are different than simply 4% each...more like 25% each.

lets say each tenant uses 100 KWH, x 6 tenants = 600 KWH, yet the city charges for 750 KWH (25%), the overage being 150 KWH, split equally this is 25 KWH each = 25%

Ah yes, another sloppy use of terminology, leads to confusion.