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About this book

Vacuum circuit breakers are widely used in distribution power systems for their advantages such as maintenance free and eco-friendly. Nowadays, most circuit breakers used at transmission voltage level are SF6 circuit breakers, but the SF6 they emit is one of the six greenhouse gases defined in Kyoto Protocol. Therefore, the development of transmission voltage level vacuum circuit breaker can help the environment. The switching arc phenomena in transmission voltage level vacuum circuit breakers are key issues to explore.
This book focuses on the high-current vacuum arcs phenomena at transmission voltage level, especially on the anode spot phenomena, which significantly influence the success or failure of the short circuit current interruption. Then, it addresses the dielectric recovery property in current interruption. Next it explains how to determine the closing/opening displacement curve of transmission voltage level vacuum circuit breakers based on the vacuum arc phenomena. After that, it explains how to determine key design parameters for vacuum interrupters and vacuum circuit breakers at transmission voltage level. At the end, the most challenging issue for vacuum circuit breakers, capacitive switching in vacuum, is addressed.
The contents of this book will benefit researchers and engineers in the field of power engineering, especially in the field of power circuit breakers and power switching technology.

Table of Contents

Frontmatter

1. High-Current Vacuum Arcs Phenomena at Transmission Voltage Level

Abstract
Vacuum circuit breakers (VCBs) are widely used to protect power distribution systems because of high interrupting capacity, low maintenance, long operating life, and eco-friendly.
Zhiyuan Liu, Jianhua Wang, Yingsan Geng, Zhenxing Wang

2. Dielectric Recovery Properties After Current Interruption in Vacuum

Abstract
In Chap. 1, we discussed the high-current vacuum arcs phenomena. We especially discussed the high-current anode mode vacuum arc because of its negative influences on current interruptions. In this chapter, we focus on the dielectric recovery properties after the arcing period.
Zhiyuan Liu, Jianhua Wang, Yingsan Geng, Zhenxing Wang

3. Vacuum Interrupters at Transmission Voltage Level

Abstract
Developing transmission voltage level vacuum interrupters poses a number of challenges. As the voltage to be interrupted increases from medium voltage, large contact gaps are needed to be able to withstand the high voltages that occur at transmission voltage levels, especially the basic insulation level, power frequency withstand voltage, and any other switching transients.
Zhiyuan Liu, Jianhua Wang, Yingsan Geng, Zhenxing Wang

4. Vacuum Circuit Breakers at Transmission Voltage Level

Abstract
Previously, there was a general idea that all technologies in developing transmission voltage level vacuum circuit breakers were based on medium voltage vacuum circuit breakers. No essentially new technical features were necessary, while it was only an extrapolation in geometry.
Zhiyuan Liu, Jianhua Wang, Yingsan Geng, Zhenxing Wang

5. Capacitive Current Switching in Vacuum

Abstract
Capacitive current switching is energization or de-energization of no-load cables/overhead lines, capacitor banks, or filters in ac circuits at distribution or transmission voltages. The switching process may involve high voltage and high current transients. Capacitor banks are widely used for the compensation of reactive power in the power system; The capacitor banks are switched frequently, perhaps once or twice a day.
Zhiyuan Liu, Jianhua Wang, Yingsan Geng, Zhenxing Wang
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