| 引用本文: | 徐友刚,沈晓峰,杨欢红,等.一种线路避雷器隐患查找用高压直流恒流源研制[J].电力系统保护与控制,2021,49(20):160-166.[点击复制] |
| XU Yougang,SHEN Xiaofeng,YANG Huanhong,et al.Research and development of a high voltage DC constant current source for hidden fault detection of line arrester[J].Power System Protection and Control,2021,49(20):160-166[点击复制] |
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| 摘要: |
| 现有的10 kV配电网避雷器隐患查找易受接地电流大小影响且无法有效识别。针对避雷器隐患定位困难的问题，着眼于直流信号对电缆电容电流的屏蔽能力和避雷器温升变化特点，研制出一种应用于配电网线路无间隙避雷器隐患查找的高压直流恒流源。利用交流斩控调压电路的规律与漏磁变压器稳定电流特性，同时采用霍尔传感器对信号进行检测并有效屏蔽磁场。结合避雷器温升与直流电流关系的试验结果，根据故障点两侧故障电流方向关系，实现避雷器隐患查找。通过PSCAD仿真及现场实际故障数据表明：基于高压直流恒流源产生直流信号注入线路，红外升温明显，且不受避雷器隐患程度干扰，提高了避雷器隐患查找的鲁棒性和准确性。 |
| 关键词: 避雷器隐患 高压直流恒流电源 信号注入 温升试验 |
| DOI：DOI:?10.19783/j.cnki.pspc.210016 |
| 投稿时间：2021-01-05修订日期：2021-02-25 |
| 基金项目:国家自然科学基金项目资助(51877135)；国网上海市电力公司科技项目资助“基于直流恒流源的安全型单相接地快速定位系统的研发”(SGSHQP00HBJS2001123) |
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| Research and development of a high voltage DC constant current source for hidden fault detection of line arrester |
| XU Yougang,SHEN Xiaofeng,YANG Huanhong,XIONG Jinshu,CAO Jinan |
| (1. Qingpu Power Supply Company, State Grid Shanghai Electric Power Company, Shanghai 201799, China;
2. Shanghai University of Electric Power, Shanghai 200090, China) |
| Abstract: |
| The fault location of lighting arrester with hidden fault in existing 10 kV distribution network is easily affected by the size of grounding current. Aiming at the difficulty of the fault location of lighting arrester with hidden fault, focusing on the shielding ability of DC signal to cable capacitance current and the temperature risen characteristics of lightning arrester, a high-voltage DC constant current source applied to the hidden danger detection of gapless lightning arrester in distribution network is developed in this paper. Using the law of AC chopping voltage regulation circuit and the stable current characteristics of magnetic flux leakage transformer, Hall sensor is used to detect the signal and effectively shield the magnetic field. Combined with the test results of the relationship between the temperature rise of the arrester and the DC current, according to the direction relationship of the fault current on both sides of the fault point, the hidden danger of the arrester can be found effectively. PSCAD simulation and field actual fault data show that the DC signal generated based on high-voltage DC constant current source is injected into the line, the infrared temperature rises obviously, and is not disturbed by the hidden danger degree of arrester, which improves the robustness and accuracy of hidden danger finding of arrester.
This work is supported by the National Natural Science Foundation of China (No. 51877135), the Science and Technology Project of State Grid Shanghai Electric Power Company "Research and Development of Safe Single Phase Grounding Fast Positioning System based on DC Constant Current Source" (No. SGSHQP00HBJS2001123). |
| Key words: lighting arrester with hidden fault high voltage DC constant current source signal injection temperature rise test |
