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This paper presents the design and experimental results of a Thomson coil-based fast mechanical switch for hybrid ac and dc circuit breakers rated at 30-kV voltage and 630-A current. The compact design with optimized circuit parameters and geometric dimensions of components targets 2-mm travel within 1 ms when driven by a 2-mF capacitor bank precharged to 500 V. The use and design of a disc spring...
The DC power delivery system is becoming an appealing research topic and real world solution due to its higher energy efficiency compare with AC delivery system. It has already been applied in data centers, commercial buildings, electrical vehicle charge stations and micro grid systems, etc. Among many new issues that need to be addressed for the DC power delivery system, ultra-fast and accurate protection...
The DC power delivery system is becoming an appealing research topic and real world solution due to its higher energy efficiency compared with AC delivery system. It has already been applied in data centers, commercial buildings, electrical vehicle charge stations and micro grid systems, etc. However, the electrical arc and related potential for fire and human injury is a main safety concern for the...
The paper presents the design and experimental results of a Thomson coil based fast mechanical switch for hybrid AC and DC circuit breakers rated at 30 kV voltage and 630 A current. The compact design with optimized circuit parameters and geometric dimensions of components targets 2 mm travel within 1 ms when driven by a 2 mF capacitor bank pre-charged to 500 V. The use and design of a disc spring...
This paper deals with the design of a 7.2 kV, 200 A hybrid AC circuit breaker employing a 15 kV Silicon Carbide (SiC) Emitter Turn-off (ETO) thyristor device as the main semiconductor switch and presents the test results to verify the functions of both the high voltage and low voltage electronic components of the medium voltage hybrid circuit breaker. The hybrid circuit breaker consists a fast acting...
This paper describes a novel protection method to limit the fault currents caused by short circuit in a voltage source converter (VSC) based DC systems with capacitors connected to the DC bus. Analyzing the development of DC fault current in such DC systems shows that capacitor discharge dominates the very rapid fault current rising at the instance of faults. If this high slope fault current surge...
In this paper, the system application, the structure and the duties of the dc breakers are firstly introduced, and then the test principle of the dc breakers is told. Based on that, the test circuits model is established and the simulation analysis of the broken process is made for passive dc breakers by the PSCAD/EMTDC simulation software. The breaking test is made on the dc breakers prototype, and...
A circuit topology which can prevent the series resonant power supply in a Tesla transformer from damage induced by the reversal voltage on the storage capacitor is presented. The circuit is based on current-limiting resistor and auxiliary capacitor which can restrict the over current in the rectifier of series resonant power supply. Moreover, adoption of the auxiliary capacitor can raise the average...
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