局部放电特高频检测装置抗电磁干扰性能的量化评估方法研究

Research on Quantitative Evaluation on Anti-Electromagnetic Interference Capability of Ultra High Frequency Partial Discharge Detection Instrument

变电站电磁干扰的存在严重影响现场局部放电检测的灵敏度与缺陷诊断的准确性,是局部放电状态检测的关键技术瓶颈之一。该文研究了干扰的来源及对于局部放电检测的影响,积累了较为完善的局部放电样本数据库。在此基础上提出高性能任意波形发生器还原典型局部放电的方案,建立通过干扰实景模拟的方式对局部放电特高频检测装置抗电磁干扰能力量化评估的平台,首次提出基于信噪比的原则对特高频检测装置抗电磁干扰能力量化评估的方法。该文提出的评价方法对于填补局部放电检测装置抗干扰性能量化评价的空白,完善局部放电状态检测技术标准具有工程实用价值。

The existence of electromagnetic interference in substations seriously affects the sensitivity of on-site partial discharge detection and the accuracy of defect diagnosis. It is one of the key technical bottlenecks for partial discharge state detection. In this paper, the source of interference and its influence on partial discharge detection are studied, and a relatively complete database of partial discharge samples is accumulated. Based on this, a high performance arbitrary waveform generator is proposed to restore the typical partial discharge. A platform of quantitative evaluation for the anti-electromagnetic interference capability of the partial discharge UHF detection device is established by means of interference real-time simulation. Based on the principle of signal-to-noise ratio, a method for quantitative evaluation of the anti-electromagnetic interference capability of UHF detection devices is proposed for the first time. The evaluation method proposed in this paper has a practical value for improving the quantitative evaluation of the anti-interference performance of the partial discharge detection device and perfecting the partial discharge state detection technology standard.