Abstract:There are about 110 thousand low voltage areas in city and rural power network in Jilin. Three-phase unbalance has great influence on voltage qualification rate, line loss, load capacity of transformer and level of equipment health. In the traditional adjustment method of three-phase load imbalance, front-line employees often solve on-site problems based on operation data and experience. As there is no scientific adjustment method, the effect is often poor.Full coverage of smart meter has been realized in state grid Jilin company. Making full use of the non-metering data and related application technologies of smart meters,and innovatively proposed the technology of synchronous zero crossing based on power line narrow band carrier,carrying out the research on automatic phase recognition technology of low-voltage customers, realizing the discrimination of the phase of the customer, and three-phase unbalanced governance strategy is generated intelligently based on the greedy algorithm,which can develop simple and easy to use intelligent auxiliary tools, provide effective technical means to solve practical problems for front-line staff, and further improve power supply reliability and economic benefit on the basis of guaranteeing various indexes.