在电力变压器中定位PD源的新方法:考虑电磁波的NLOS传播
Qingdong Zhu1, Mengzhao Zhu1, Wenbing Zhu1
1State Grid Shandong Electric Power Research Institute, Jinan 250003, China.
一种新的方法通过解决非视线 (NLOS) 信号错误来准确地定位部分放电 (PD) 源. 使用更多的传感器提高了准确性,六个传感器为PD定位提供了最佳结果.
科学领域:
- 电气工程
- 信号处理
- 电磁学
背景情况:
- 部分放电检测对于电气设备的健康至关重要.
- 传统的到达时间差异 (TDOA) 方法与非视线 (NLOS) 传播错误作斗争.
- 精确的PD源定位对于有效的维护和防止故障至关重要.
研究的目的:
- 提出一种针对NLOS传播的新型PD源定位方法.
- 为了提高PD源定位的准确性和稳定性.
- 评估传感器数量对定位准确性的影响.
主要方法:
- 开发了一种基于TDOA的新型PD源定位方法.
- 将近似的NLOS传播误差作为常数来减轻其影响.
- 使用超过四个传感器来减少过度校正效应.
- 使用数学和几何模型将拟议的方法与传统的TDOA进行比较.
- 在一个带有6个传感器的35kV测试变压器上进行实验验证.
主要成果:
- 与传统的TDOA相比,提出的方法显示出更高的准确性和稳定性.
- 拟议方法的局部化误差比TDOA缓慢增加.
- 增加传感器数量提高了定位准确性,超过六个传感器的回报率下降.
- 使用六个传感器实现了10.88厘米的最小计算误差.
- 精度提高了82.04% (相对于四个传感器) 和78.94% (相对于五个传感器) 的六个传感器.
结论:
- 新的PD源定位方法有效地减轻了NLOS传播错误.
- 最佳的传感器配置是六个传感器.
- 该方法为电气系统的PD定位准确性和稳定性提供了显著的进步.
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