Protection without current transformers for electrical installations with three-phase bus ducts
Kletsel M. Mashrapov B. Mashrapova R.
March 2025Elsevier Ltd
Electric Power Systems Research
2025#240
A current protection which responds to the difference in absolute values of phase currents and receives information from inductance coils (IC) mounted on three-phase bus duct enclosure is suggested. The protection does not need in current transformers, thus saving high-quality copper, steel, and expensive high-voltage insulation in unprecedented amount. This protection is comparable with traditional overcurrent protections in speed and reliability and is superior in sensitivity in the absence of neighboring bus duct. Induction of magnetic fields around bus duct enclosure, which act on ICs (considering fields produced by a neighboring bus duct), is studied in experiments and computer simulation. Based on results of these studies, IC mounting points are selected; protection operation algorithm and techniques for selecting protection operation parameters and estimating its sensitivity are developed. The operation algorithm takes into account a need in ensuring the protection operation in the events of fault in the circuits of any IC. A laboratory prototype of the protection system and structures for fastening ICs are described; voltage oscillograms confirming protection efficiency are presented.
Bus duct enclosure , Current , Experiment , Inductance coils based protection , Interference , Simulation
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Department of Electric Power Industry Toraighyrov University, Lomov str., 64, Pavlodar, Kazakhstan, 140008, Kazakhstan
Department of Electric Power Industry Toraighyrov University
10 лет помогаем публиковать статьи Международный издатель
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