Selection and Economic Benefit Analysis of Current Limiting Circuit Breaker in a Project of a Newly-Built Large Nuclear Chemical Plant

Abstract

With the continuous development of science and technology and the iteration of various types of low-voltage protection products, electrical designers are focusing not only on the reliability and security of the power supply system but also its economic benefits. From the calculation of electricity load in the early stage, to the selection of transformers, and then to the determination of the number of low-voltage distribution cabinets, as well as the selection of each feeder circuit protection devices, designers strive to come up with the most reliable and economical choice in each link through rigorous calculation and analysis. In the design and installation of large communities or factories, a small technical improvement can bring substantial economic benefits. Combined with engineering practice, this paper briefly introduces several protective appliances and their functions in low-voltage distribution circuits, the main differences between current limiting circuit breakers and ordinary circuit breakers are also revealed. The selection principle and basis of current limiting circuit breaker in the electrical design of a nuclear chemical engineering project are described in detail. The economic benefits and significance of selecting current limiting circuit breaker are compared and analyzed in this paper. The development prospects of current limiting circuit breaker selection in power supply and distribution system in large nuclear chemical plants and its key role for the whole plant in the future are discussed.