基于便携式仪器的1000kV输电杆塔接地装置冲击阻抗测试研究

发布时间：2018-08-17 18:28

【摘要】：为大规模开展特高压1 000 kV输电杆塔接地装置的冲击阻抗特性测试,采用便携小型化仪器输出小幅值8/20、10/350μs雷电流作为入射波并采集接地装置的暂态响应电压,从而获取接地装置在模拟直击雷、感应雷工况下的冲击阻抗特性。基于标准电阻对仪器进行了试验测试,验证了该装置测试结果的准确性。对上海电网1 000 kV安塘线典型输电杆塔存在地线分流和无地线分流的条件下,对接地装置进行了冲击阻抗特性测试。结果分析表明,便携小型化仪器能够稳定输出8/20、10/350μs雷电流,测试结果以图形化输出,分析结论可以反应雷电流通过输电杆塔接地装置泄放时造成的冲击暂态地电位升,即较工频接地阻抗高许多倍的瞬时冲击阻抗特性。总之,该测试方法适合用于输电杆塔接地装置冲击阻抗的现场测试,为1 000 kV输电杆塔防雷性能评估提供依据。
[Abstract]:In order to test the impulse impedance characteristics of the earthing device of UHV 1 000 kV transmission tower on a large scale, the portable miniaturized instrument is used to output a small lightning current of 8 / 20 / 10 / 350 渭 s as the incident wave and to collect the transient response voltage of the earthing device. The impulse impedance characteristics of grounding device under simulated direct lightning strike and induced lightning condition are obtained. The instrument is tested based on the standard resistance, and the accuracy of the test result is verified. Under the condition that the typical transmission tower of 1 000 kV Antang line of Shanghai power network has ground distribution and no ground distribution, the impulse impedance characteristic of grounding device is tested. The results show that the portable miniaturized instrument can steadily output 8 / 20 / 10 / 350 渭 s lightning current, and the test results are graphically outputted. The conclusion of the analysis can reflect the surge of the transient ground potential caused by the lightning current being discharged through the grounding device of the transmission tower. The transient impulse impedance is many times higher than the power frequency grounding impedance. In a word, the method is suitable for the field test of impulse impedance of transmission tower grounding device, and provides the basis for the assessment of lightning protection performance of 1 000 kV transmission tower.
【作者单位】：国网陕西省电力公司培训中心;国网上海市电力公司电力科学研究院;华东电力试验研究院有限公司;
【分类号】：TM75;TM862

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