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| Distributed line selection technology of multistage switch station structure in power distribution network |
| Yu Yin’gang, Li Ling, Wu Xisheng, Hong Xinchun, Chen Wenbi |
| Anhui Onesky Electric Technology Co. Ltd, Hefei 230088 |
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Abstract In order to improve the reliability of power supply for enterprises, the user power supply system is becoming more and more complex and its operation mode is flexible. In particular, the distribution network of enterprises that require high reliability of power supply, such as chemical industry, coal mine, steel plant and other heavy industry, has a more complex and flexible structure. The power supply network of such enterprises is characterized by multi-bus ring network, diversified power supply, multiple subordinate switching stations, complicated communication switches among switching stations at all levels, and difficulty in selecting lines after single-phase ground fault. Aiming at the problem of single-phase ground fault line selection in enterprise power supply system with multi-stage switch station structure and flexible operation mode, a distributed collection and centralized processing line selection scheme based on disturbance method is proposed. By single-phase earth fault occurs from system neutral point injection size controllable half wave current on the system disturbance caused by the pulse current collector of distribution in the system will capture the pulse current analog signal into a digital signal sent to the concept of the background, the concept of background through analysis, calculation and comparison, finally choose one or more fault branch. The implementation of this scheme has greatly improved the accuracy of line selection.
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Received: 25 May 2020
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2020, Vol. 21 
