Research and case studies on fusing mechanism of high-voltage side fuse of hydro-generator outlet voltage transformer

Zhe Feng; Jie Zhu; Guangqing Xi

doi:10.1117/12.2640524

19 October 2022 Research and case studies on fusing mechanism of high-voltage side fuse of hydro-generator outlet voltage transformer

Zhe Feng, Jie Zhu, Guangqing Xi

Author Affiliations +

Proceedings Volume 12294, 7th International Symposium on Advances in Electrical, Electronics, and Computer Engineering; 122942I (2022) https://doi.org/10.1117/12.2640524
Event: 7th International Symposium on Advances in Electrical, Electronics and Computer Engineering (ISAEECE 2022), 2022, Xishuangbanna, China

Abstract

The high-voltage side fuse of the generator outlet voltage transformer is used to protect the stability of the high-voltage system due to the failure of the voltage transformer itself or the failure of the primary side. When the fuse at the high-voltage side of the voltage transformer is overcurrent and blown, the voltage at the secondary side should drop to zero voltage instantaneously (Fast-melting). In actual operation, due to the aging, poor quality and partial fusing of the fuse, the quartz sand in it cannot play the arc extinguishing function well, resulting in the fuse breakpoint being continuously connected through the arc, and the voltage at the secondary side of the voltage transformer is sometimes high, sometimes low or continuously falling (Slow-melting), which leads to chain reactions such as false forced excitation, voltage rise at the machine terminal, alarm of the protection device, and machine tripping. This paper analyzes and studies the fusing mechanism of a slow-melting accident of the high-voltage side fuse of the generator outlet voltage transformer in a power station, and proposes targeted preventive measures.

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Zhe Feng, Jie Zhu, and Guangqing Xi "Research and case studies on fusing mechanism of high-voltage side fuse of hydro-generator outlet voltage transformer", Proc. SPIE 12294, 7th International Symposium on Advances in Electrical, Electronics, and Computer Engineering, 122942I (19 October 2022); https://doi.org/10.1117/12.2640524

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KEYWORDS

Transformers

Resistance

Analytical research

Oxidation

Quartz

Temperature metrology

Ferromagnetics

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