| 引用本文: | 咸日常,鲁 尧,陈 蕾,等.干式空心串联电抗器匝间短路故障特征研究[J].电力系统保护与控制,2021,49(18):10-16.[点击复制] |
| XIAN Richang,LU Yao,CHEN Lei,et al.Fault characteristics of an inter-turn short circuit of a dry-type air core series reactor[J].Power System Protection and Control,2021,49(18):10-16[点击复制] |
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| 摘要: |
| 干式空心串联电抗器是电力系统无功补偿回路中的重要电气设备，其主绝缘通常采用环氧浇注结构，在实际研究中其匝间绝缘故障设置困难、试验验证成本高。为了监测是否发生匝间短路故障、提高在线监测灵敏度，借助有限元软件Comsol仿真研究了电抗器发生匝间短路时各电气参数的变化情况。首先仿真计算正常状态下电抗器的电感值和电流值，通过与解析计算结果进行比较，验证所建模型的正确性。然后在不同位置分别设置匝间短路故障点以得到电抗器各线圈层电流。最后得出其等效电阻、等效电抗、等效阻抗、功率因数、损耗因数等电气参数的变化情况。仿真分析结果表明：电抗器匝间短路故障点的位置不同，各电气参数变化率也不同，其绝对值由端部向中部、由内层向外层呈现增大趋势，且损耗因数和功率因数变化率较大，对匝间短路故障反应灵敏，可用于干式空心串联电抗器匝间短路故障的在线监测与保护。 |
| 关键词: 干式空心串联电抗器 有限元 匝间短路 损耗因数 功率因数 |
| DOI：DOI: 10.19783/j.cnki.pspc.201295 |
| 投稿时间：2020-10-27修订日期：2020-12-20 |
| 基金项目:国家“十三五”重点研发计划(2016YFB0901303) |
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| Fault characteristics of an inter-turn short circuit of a dry-type air core series reactor |
| XIAN Richang1,LU Yao1,CHEN Lei1,GENG Kai2,WANG Yanping1,YIN Baolin3 |
| (1. School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China;
2. Shandong Huineng Electric Co., Ltd., Zibo 255089, China; 3. Zhiyang Innovation Technology Co., Ltd., Zibo 255086, China) |
| Abstract: |
| The dry-type air-core series reactor is an important component in the reactive power compensation loop of a power system. Its main insulation usually adopts an epoxy casting structure. It is difficult to set the inter-turn insulation fault and the test verification cost is high. There is a need to monitor whether turn-to-turn short-circuit faults occur and improve online monitoring sensitivity. In this paper, the finite element software Comsol is used to simulate the changes of electrical parameters when inter-turn short circuits occur. First, the inductance and current values of the reactor under normal conditions are simulated and calculated, and the correctness of the model is verified by comparing with the results obtained by analytical calculation methods. Then the inter-turn short-circuit fault points at different positions are set to obtain the current of each coil layer of the reactor. Finally, the change of electrical parameters such as equivalent resistance, reactance, mpedance, and power and loss factors of the reactor is calculated. The simulation analysis shows that the different electrical parameters of the reactor have different rates of change because of different short-circuit locations. The absolute values of the reactor have a tendency to increase from the end to the middle and from the inner layer to the outer layer. Among the parameters, the change rate of the loss factor of the reactor and power factor change rate are large, and sensitive to reactor short-circuit faults between turns. The system can be used for on-line monitoring and protection of inter-turn short-circuit faults in dry-type air-core series reactors.
This work is supported by the National “Thirteen-Five Year” Research and Development Program of China (No. 2016YFB0901303). |
| Key words: dry-type air core series reactor finite element inter-turn short circuit loss factor power factor |
