20 kV配电网互感器熔断机制分析及抑制措施

doi:10.19595/j.cnki.1000-6753.tces.231888

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Abstract

To cope with the rapid growth of urban power load and density, 20 kV distribution networks have been put into use in Suzhou, Shenzhen and other places, becoming the development trend of medium voltage distribution networks in major cities in China. The frequent occurrence of potential transformer (PT) fuse blowing accidents in 20 kV distribution networks affects the safe and stable operation of the system. Due to power supply requirements, the length of cables in 20kV distribution networks is extremely long, and the capacitance to ground is large. The ratio of capacitive impedance to inductive impedance in the system is much smaller than the range specified in the Peterson resonance criterion, resulting in a fundamental change in the electromagnetic energy interaction mechanism of the system. Ferroresonance will no longer occur, which is significantly different from the fault transient in traditional 10 kV distribution networks. However, existing research has overlooked the nonlinear excitation characteristics of PT, and has not yet conducted in-depth analysis of the electromagnetic energy interaction mechanism and influencing factors in this process, making it difficult to support research on suppression measures and leading to difficulties in preventing PT fuse blowing accidents.
Therefore, this article aims to reveal the mechanism of fuse blowing accidents on PT primary side in large-scale distribution networks and propose targeted suppression measure. Based on a actual 20 kV distribution network, the fault energy interaction circuit is extracted, and the process of cable to ground capacitance discharge after a short circuit is analyzed; Establish a nonlinear differential equation for the process of cable capacitance discharging to PT, characterize the nonlinear excitation characteristics of PT based on the principle of piecewise linearization, obtain segmented time-domain analytical solutions of PT primary side current for the equation under different states, and compare the error between analytical calculations and simulation results to achieve accurate analysis of the process; Based on the analytical formula of PT primary side current, calculate its angular frequency and time constant, and then analyze the law of PT current characteristics changing from "quantitative" to "qualitative" during the process of increasing the ground capacitance in system, revealing the mechanism of electromagnetic energy interaction throughout the entire process of system fault; Construct a 20 kV system electromagnetic transient simulation model, reproduce the fault waveform of the fuse accident, analyze the waveform characteristics through analytical calculations, reveal the influence of system operation mode on current, and study the risk of PT fuse blowing; Based on mechanism analysis, targeted suppression measures are proposed to suppress the amplitude of PT primary side overcurrent through discharge circuit topology reconstruction. Build a high-voltage test platform in the laboratory, conduct suppression measures verification experiment, further prove the effectiveness and feasibility of the suppression measure proposed in this paper.
Research has shown that the analytical calculation results in this article are accurate and can analyze the PT high-voltage side fuse mechanism in large-scale distribution networks. The proposed suppression measures have significant effects and high feasibility, and the research results can support the safe and stable operation of 20 kV distribution networks.

Key words： 20 kV distribution network fuse blown nonlinear analytic calculation Electromagnetic Transients Program (EMTP)

Received: 13 November 2023

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TM451+.1

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	Articles by authors
	Yang Ming
	Shi Yifeng
	Sima Wenxia
	Liu Yao
	Xia Zipeng

Cite this article:

Yang Ming,Shi Yifeng,Sima Wenxia等. Analysis and Suppression of PT Fusing Mechanism in 20 kV Distribution Network[J]. Transactions of China Electrotechnical Society, 0, (): 231888-231888.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.231888 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/231888

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