Theoretical Analysis and Experimental Verification of Switching Current Transient Process of High Voltage Switch-gear Circuit Breaker

This paper proposes a new and surge-less solid-state direct current (DC) circuit breaker in a high-voltage direct current (HVDC) transmission system to clear the short-circuit fault. The main purpose is the fast interruption and surge-voltage and over-current suppression capability analysis of the breaker during the fault. The breaker is equipped with series insulated-gate bipolar transistor (IGBT) switches to mitigate the stress of high voltage on the switches. Instead of conventional metal oxide varistor (MOV), the resistance–capacitance freewheeling diodes branch is used to bypass the high fault current and repress the over-voltage across the circuit breaker. The topology and different operation modes of the proposed breaker are discussed. In addition, to verify the effectiveness of the proposed circuit breaker, it is compared with two other types of surge-less solid-state DC circuit breakers in terms of surge-voltage and over-current suppression. For this purpose, MATLAB Simulink simulation software is used. The system is designed for the transmission of 20 MW power over a 120 km distance where the voltage of the transmission line is 220 kV. The results show that the fault current is interrupted in a very short time and the surge-voltage and over-current across the proposed breaker are considerably reduced compared to other topologies.

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Research on the Service Life of High-Voltage Vacuum Circuit Breaker of High-speed Train

10.1109/cieec50170.2021.9510823 ◽

2021 ◽

Author(s):

Jian Li ◽

Hui Dong ◽

Pankui Yang ◽

Yunming Shi ◽

Jianqiang Liu

Keyword(s):

Service Life ◽

High Voltage ◽

High Speed ◽

Circuit Breaker ◽

High Speed Train ◽

Vacuum Circuit Breaker

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Multi-stage convergent-divergent nozzle structure and their effects on gas flow in high voltage SF/sub 6/ circuit breaker

2005 International Conference on Electrical Machines and Systems ◽

10.1109/icems.2005.202950 ◽

2005 ◽

Author(s):

Yundong Cao ◽

Xiaoming Liu ◽

Ming Zong ◽

Yan Liu

Keyword(s):

High Voltage ◽

Gas Flow ◽

Circuit Breaker ◽

Multi Stage ◽

Nozzle Structure

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UHV AC and DC Coordinated Operation Techniques Based on Continuous Simulation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.713-715.1347 ◽

2015 ◽

Vol 713-715 ◽

pp. 1347-1350

Author(s):

Yu Fei Rao ◽

Lin Lin Yu

Keyword(s):

Theoretical Analysis ◽

High Voltage ◽

Power Grid ◽

Double Pole ◽

Continuous Simulation ◽

Operation Techniques ◽

Load Mode ◽

Typical Method ◽

Ultra High Voltage

In the process of China's ultra high-voltage (UHV) construction, Henan UHV power grid is the important part. Summer great load mode of Henan power gird is chosen as the typical method. In the background of completing Nanyang UHV extension project, based on single pole running and double pole running of Hami-Zhengzhou UHVDC project respectively, it is simulated and analyzed. The results indicate that power grid cannot maintain stability when single pole block fault or double pole block fault occurs. Through theoretical analysis and simulation, under UHV AC running certain limit, HVDC latching grid is stable. Under UHV DC running certain limit, HVDC latching grid is stable. Based on continuous simulation, this paper obtained the coordinated operation of area UHV AC and DC.

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