Voltage Flicker Issues Related to New Large Residential Loads
The voltage flicker from the starting of newer heat pumps, AC units and tankless water heaters may present a significant challenge to utilities. Solutions to this problem may include over-sizing transformers, increasing secondary conductor sizes, or reducing starting current through reduced voltage starts. Each of these solutions has its own trade-offs and some may be impractical to implement on existing services. Quite often customers do not understand and are unwilling to accept the additional cost involved with serving these types of loads. This project aims to characterize, through examples, the impact of the newest voltage flicker-causing loads such as large heat pumps and on-demand electric water heaters, and to explore mitigation measures that can be taken for new and existing customers. The result is a white paper which can be used to explain and justify the mitigation measures.