Non-contact measurement method of busbar voltage phase of substation arrester
Non-contact measurement method of busbar voltage phase of substation arrester
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DOI：
10.1016/j.epsr.2022.108959
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发表时间：
2023-01
影响因子：
3.9
通讯作者：
Yongzhi Min;Zhenhua Long;Z. Du;Shengchun Meng;Guohua Yue;L. Shu
中科院分区：
文献类型：
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作者：
Yongzhi Min;Zhenhua Long;Z. Du;Shengchun Meng;Guohua Yue;L. Shu
金属氧化物避雷器（MOA）阻性电流是评价避雷器老化状况的重要参数。为了从全电流中提取电阻分量，必须知道全电流和母线电压之间的相位角。传统测量中，电压信号需要从电容式电压互感器（CVT）的二次侧采集，存在短路引发设备损坏的风险。Transformer。针对上述问题，提出了一种变电站避雷器母线电压相位非接触测量方法。通过在避雷器下放置合适的电场探头，由电场信息得到母线电压相位。最后，以实际运行的特高压变电站避雷器为例，对该方法进行了验证，并给出了探头的优化布置。结果表明，当电场探头放置在避雷器与CVT之间，距离避雷器1.3 m ~ 2 m时，误差相对最小。此外，双检测点的布置不仅可以获得电网三相电压的相序，而且可以平均测量误差。
The resistive current of metal oxide arrester (MOA) is an important parameter for evaluating the aging condition of arrester. To extract the resistive component from the full current, the phase angle between the full current and the busbar voltage must be known. In conventional measurement, the voltage signal needs to be acquired from the secondary side of the capacitor voltage transformer (CVT), so there is a risk of short circuit to trigger equipment damage. To solve the above problems, a non-contact measurement method for the busbar voltage phase of substation arrester is proposed. By placing suitable electric field probe under the arrester, the busbar voltage phase is derived from the electric field information. Moreover, models of ultra-high voltage (UHV) substation arresters based on actual operation are constructed to verify this method, and the optimal placement of probes is given. The results show that the error is relatively minimum when the electric field probe is placed between the arrester and the CVT and is 1.3 m – 2 m away from the arrester. In addition, the arrangement of double detection points proposed can not only obtain the phase sequence of the three-phase voltage of the power grid, but also average the measurement errors.