A utility was struggling to optimise the utilisation of numerous distribution transformers in their distribution system. There was no data on the quality and reliability of supply nor were they able to decide the proper maintenance schedules and the augmentation programme for the transformers.
It was found that 1% DT were loaded beyond their rating, another 1% were loaded more than 80% of their rated capacity whereas 22% DT were under-loaded.
A comprehensive study was proposed to undertake work to meet these objectives.
A comprehensive distribution transformer study was to be undertaken. This involved capturing the DT meter data, analysing it and submitting meaningful reports to the utility, enabling it to take corrective action. The month-on-month trend for about 3,000 transformers was to be presented to facilitate monitoring the improvement.
To deliver this service, we had to develop special software tools. After ensuring correct metering in all the distribution transformers, the project started with collecting meter data and processing it. Various Information reports were generated with a month-on-month trend of the progress. The special features of the service were:
- Monthly collection of meter data through remote meter reading (RMR) or by using common meter reading instrument (CMRI)
- Generation and submission of information reports to the utility
- Reporting abnormalities like metering error, and phase association error to prompt corrective action which becomes pre-requisite of correct information