Current and voltage of the power system, the basic physical

Current, voltage, power system is the basic physical quantities. Electronic current and voltage transformers as a new type of current, voltage measuring device with small size, light weight, no ferromagnetic saturated ferromagnetic resonance  mcb circuit breaker , computer protection interface easily with other characteristics, has made rapid progress in recent years. The digital output electronic transformer Electric transformer developed after further accelerate the pace of development of electronic transformer. This paper describes a comprehensive electronic transformer basic principles and the basis of composition, introduced digital output interface electronic transformer important part - the definition and composition of merged cells analyzed merging unit features.