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Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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Smart Internet of Isolated Capacitor Trip Device for High-voltage Protective Relay of Backup Power

Cheng-Tsung Huang, Ho-Chi Lien, and Wen-Ping Chen

(Received December 5, 2019; Accepted July 28, 2020)

Keywords: capacitor trip device, self-test, real-time notification, protective relay

In high-voltage power systems, overload or short-circuit accidents occur frequently owing to failure of the user equipment, leading to abnormal occurrence of power accidents. Therefore, protective relays must be installed before and after each feeder to isolate the occurrence of faults and thus reduce damage to the power system. However, when the working power supply of the protective relay loses power, it will not be possible to isolate the accident feeder, and the failure of the power system will expand, seriously affecting the reliability of the system power supply. Therefore, it is expressly stated by the Taiwan Power Company that a capacitor trip device (CTD) must be installed to ensure a power supply to the protective relay for high-voltage users. However, CTDs currently on the market often fail to ensure proper operation of the protective relay owing to insufficient capacitance or low output operating voltage. Therefore, we propose a high-capacity CTD capable of performing self-tests and instant notification for network monitoring. Compared with the conventional CTD, our CTD can prevent instantaneous large current transfer to the powered device, ensuring that the power supply of the powered device is uninterrupted. It can accomplish real-time monitoring of power status, provide a stable power supply, prevent overcurrent, and protect equipment. It is a very important contribution to the protection of the relay system.

Corresponding author: Wen-Ping Chen

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