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Monday, July 26, 2010

preparation of monthly reports (Part 1)

Every last Monday of the month, monthly reports are required in our substation. There are at least nine reports to be submitted at our main office were trends and different values are tallied. I am going to discuss all of the reports that we are required to submit.

The most important report that we prepare is the Monthly Operational Report. In this report, power transformers, transmission lines, feeders and station service transformers are monitored in terms of energy used and supplied, the peak loads and its corresponding reactive power, date and time of occurence. The data are being tallied to get the total percent losses by calculating the percent ratio of incoming energy and outgoing energy. The percent loss must be below five percent.
Positive percent loss indicate that the supplied energy is greater than the consumed energy, so the generating plants are at the losing side in this scenario because tey are generating energy but the consumer only consumes 95% of the energy so they will only pay or that 95%. But if the percent loss has a negative value, then the customers are at the losing end because they are paying energy that the generating plants had supplied them at a lower amount of energy. This discrepancy might be caused by the transmission line losses, meter and instrument transformers inaccuracies.
Next reports are the Transmission line loading profile (TLLP) and Transformer load profile (TLP). TLLP provides the necessary information about transmission and sub-transmission lines like the name, voltage level, circuit kilometer, structure type, size of conductor, year installed, rated load, maximum load, maximum current and its corresponding date and time of occurence. This will enable the engineers to see the percent loading of the line and the date and time the load usually peaks.
The TLP provides the important data of the power transformer like the rated power, percent loading, as well as the date and time of the occurence of peak load.

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