Design of PLC-Based Identifier to Support Transformer Load Management in Taipower

To support transformer load management, a narrow-band power line carrier (PLC)-based identifier has been designed and developed for the determination of customers served by each distribution transformer. The transmission characteristics of a PLC signal over low-voltage distribution lines is simulated by using the mathematical model of distribution transformers, line conductors, and customer loading at high frequencies of the carrier signal. After completing the development of PLC-based identifier, a field test has been executed to verify the performance of the identifier to determine the connectivity of the distribution transformer and the customers served without requiring power service interruption. With the customer account numbers updated by the PLC identifier, the monthly energy consumption and the service type of customers served by each distribution transformer are retrieved from the customer information system. The daily power profile and peak loading of the distribution transformers are then derived according to the energy consumption and the typical load patterns of the customers served.