Abstract
Although a wide variety of different types of electrically protective devices is used nowadays, industrial facilities witness constant growth in the number of failures of power station and substation switchgear components due to various reasons. Many specialists working in the power-engineering sphere express opinions that the facilities should be equipped with protection that operates in case of busbar faults. The given article investigates peculiarities in the design of the busbar differential current protection instrument that employs Rogowski coils as primary current transducers. A design of a noise-immune sectionalized Rogowski coil with double-layer winding is suggested, which makes it possible to significantly improve operational performance of busbar differential protection. Main attention is paid to methods of mathematical modeling of transient processes in busbar differential protection, based on designs of such coils developed in the Far Eastern Federal University. The article dwells upon theoretical research and technical features to be taken into account while developing modeling schemes of longitudinal differential protection of a three-phase busbar system based on Rogowski coils. Results of protection modeling in Micro-Cap software are described. Based on the analysis of data acquired during modeling; a valid conclusion is made about advantages of using Rogowski coils in busbar differential protection, which provides improvement of sensitivity and speed of response of such protective devices.
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