A voltage measurement accuracy assessment system for smart distribution equipment

As Smart Grid is being applied to distribution power system, SDMS (Smart Distribution Management System) has been developed for distribution power system management. Distribution power system has been changed from radial system to closed loop or mesh systems due to connection of distributed generation growth. Data from distribution equipments which are installed at distribution line must be accurate for the performance of SDMS. This study analyzes the voltage measurement data from distribution equipment. However, the results of the analysis confirm to have some errors in voltage measurement data from distribution equipment. These errors come from aging of voltage sensor in distribution equipment and inaccurate data transfer to FRTU through the controller. The main problem is not to assess the voltage measurement data after first installation of distribution equipment at the distribution line. This paper shows the voltage measurement accuracy assessment system that is to evaluate the voltage measurement data from distribution equipment on liveline to solve the problem. This system had a field test to check its performance. It will be used to assess the performance of distribution equipments and smart distribution equipments.