An Adaptive Differential Protection and Fast Auto-Closing System for 10 kV Distribution Networks Based on 4G LTE Wireless Communication

Wen An, Jun Jie Ma, Hong Yang Zhou, Hong Shan Chen, Xu Jun and Xu Jian
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Wen An: School of Automation, Foshan University, Foshan 528225, China
Jun Jie Ma: School of Automation, Foshan University, Foshan 528225, China
Hong Yang Zhou: Dispatching and Control Center, China Southern Power Grid Co. Ltd., Guangzhou 510080, China
Hong Shan Chen: Dispatching and Control Center, China Southern Power Grid Co. Ltd., Guangzhou 510080, China
Xu Jun: Department of Distribution Automation, Beijing Sifang Automation Co. Ltd., Beijing 100085, China
Xu Jian: Department of Distribution Automation, Beijing Sifang Automation Co. Ltd., Beijing 100085, China

Future Internet, 2019, vol. 12, issue 1, 1-13

Abstract: With the development of wireless communication technology and computer technology, more and more smart technologies have been applied in electricity distribution networks. This paper presents an adaptive current differential protection and fast auto-closing system for application in 10 kV distribution networks in China Southern Power Grid. The current differential protection can adaptively change its settings according to the topology change of the primary distribution networks, thus the system effectively reduces the operation and maintenance cost of the power distribution network. In order to restore the power supply for the healthy part of the 10 kV networks quickly after a power system fault is cleared, the protection and control system provides wide area control function for automatic fault isolation and automatic switching. The traditional overcurrent protection and control system have no fault location function, it may take several minutes or even hours to manually locate a fault and then restore the power supply. Compared with the protection and control system of the traditional 10 kV distribution networks, the system developed can locate and isolate faults within 900 ms (assuming that the operating time of the load switch is 700 ms), and can quickly restore power supply in less than one second after a power system fault is cleared.

Keywords: adaptive current differential protection; auto-closing; distribution network; wireless communication (search for similar items in EconPapers)
JEL-codes: O3 (search for similar items in EconPapers)
Date: 2019
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