Development of condition monitoring techniques for SF6 alternatives in high voltage plant

随着电力部门减少SF6使用量的努力，目前已有几种候选气体在商业上可用或正在评估中，用于气体绝缘高压工厂。PD监测已被确立为SF6填充设备状况评估的手段，初步研究表明其用于替代品的潜在可行性。为充分探索局部放电检测在SF6替代候选气体中的应用，特别是在中高压开关设备中的应用，提出了一个项目。声能和电磁能的传播以及在不同开关设备设计中的检测将被研究。将对SF6及其替代品进行实验室和现场测量，以检查局部放电的发生，表征不同的缺陷类型，并更好地了解绝缘系统的潜在劣化。这项研究将采取务实的方法。将从退役的设备中收集不同的缺陷类型，以试图找到与文献相匹配的相关缺陷。在设计方法和测试设置之前，将在整个研究中使用建模软件对不同的实验和参数进行计算和建模。这项研究的目的是测试各种SF6替代绝缘气体和不同类型的缺陷，因此，由于样本量大，将采取一种方法学的方法来减少总的初始轮测试。根据小规模试验的结果，试验将转移到真实大小的高压地理信息系统，在真实的室外变电站环境中进行长期监测试验。

With a drive to reduce the use of SF6 in the power sector, several candidate gases are now commercially available or under evaluation for use in gas insulated high voltage plant. PD monitoring has been established as means for condition assessment of SF6 filled equipment with initial studies demonstrating its potential feasibility for use in alternatives. A project is proposed to fully explore the application of PD detection to SF6 alternative candidate gases, in particular for medium voltage and high voltage switchgear. Propagation of acoustic and electromagnetic energy will be investigated along with detection in different switchgear designs. Laboratory and field measurements will be made on both SF6 and its alternatives to examine the occurrence of PD, characterise different defect types and better understand the potential degradation to the insulation system.A practical and realistic approach will be taken into this research. Different defect types will be collected from equipment that were decommissioned in an attempt to find relevant defects to match the literature. Modeling software will be used throughout this research to calculate and model different experiments and parameters prior to designing a methodology and test setup. This research aims to test various SF6 alternative insulating gases and different defect types therefore a methodological approach will be taken to reduce the overall initial rounds of testing due to the large sample size. Based on the outcome of the small-scale results, the testing will move to real size HV GIS to perform long term monitoring test at a real outdoor substation environment.