Peak current limiting device design using an oscillating zero crossing circuit and current limiting characteristics analysis
DOI：10.19783/j.cnki.pspc.240456
Key Words:LC high-frequency oscillatory circuit  forced zero-crossing  ultra-high speed vacuum circuit breaker  peak current limiting
Author NameAffiliation
YU Yingang1,2 1. School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
2. Anhui Province Joint Construction Discipline Key Laboratory of High Reliable Power Distribution Technology, Hefei 230088, China 
PAN Tianhong1 1. School of Electrical Engineering and Automation, Anhui University, Hefei 230601, China
2. Anhui Province Joint Construction Discipline Key Laboratory of High Reliable Power Distribution Technology, Hefei 230088, China 
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Abstract:Excessive short-circuit current in distribution networks of industrial and mining enterprises is one of the most severe threats to the stable operation of equipment. To address this issue, an electrical circuit comprising an LC series circuit connected in parallel with the main circuit breaker is proposed, generating a current frequency of approximately 1.3 kHz. The high-frequency current flows through the main circuit breaker along with the system short-circuit fault current, forcing the short-circuit current to reach zero earlier and enabling a short-circuit current-limiting strategy in a vacuum condition. The proposed strategy incorporates an ultra-high-speed vacuum circuit breaker with an opening time of less than 1.2 ms, and a parallel LC high-frequency oscillatory circuit as a forced zero-crossing unit. This setup allows the main circuit to be rapidly interrupted, while a current-limiting reactor is subsequently introduced to effectively suppress the short-circuit current. Furthermore, this paper provides a detailed analysis of the operating mechanism of the current-limiting device, key parameter design, and its potential application in real-world distribution networks. Simulation and experimental validations demonstrate that the proposed current-limiting device can limit the short-circuit peak to below 70% of the actual value, thereby significantly reducing the peak short-circuit current, mitigating the adverse impact on distribution network equipment, and substantially enhancing the overall system operational stability.
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