Automatic phase selector for residential electric meter

• Main Authors: ZHANG MIN, WANG SHUHUI, SHI FENGQI, ZHANG MINGFEI
• Format: Patent
• Language: English
• Published: 11.11.2015
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention relates to an automatic phase selector for a residential electric meter, and the phase selector mainly consists of three parts: a signal collection device, a logic judgment device, and an execution device. The above three parts are packaged in a housing in a centralized manner. As is shown in the graph, the signal collection device consists of three transformers with a fixed transformation ratio and a rectification filtering circuit, and enables a three-phase power frequency voltage to be changed into an about 8.4V DC voltage signal. The logic judgment device consists of a signal comparison and logic judgment integration circuit and a peripheral element. The execution device mainly consists of three AC contactors, is used for switching power supplies of all phases, and achieves an effect of automatic phase change. The phase selector is mature in technology, is simple in structure, is low in manufacture cost, and is high in reliability.