Partial discharge detection and analysis in motor winding under variable frequency and air pressure

现代“更电动”飞机的电气设备的增长是通过增加电源的电压来实现的。绝缘系统上的电应力随着电压的增加而增加，并导致局部放电(PD)。在较高的电压下，局部放电将是破坏性的，并导致绝缘故障。多电飞机在较高的电应力和低气压的运行条件下，电气绝缘系统的完整性是一个严重的问题。飞机在上升和下降过程中会承受很大范围的操作压力。在33,000到46,000英尺(10到14公里)的高海拔地区，气压下降到地面气压的30%。众所周知，空气的绝缘强度随着海拔的升高而降低，这增加了局部放电的风险。飞机电力系统部件的性能必须在大气压以下的高空环境中保持可靠。正因为如此，亚大气压力下局部放电活性的测量一直是飞机绝缘系统评估的一个感兴趣的话题。该研究项目的工业合作伙伴IRIS Power是一家国际公认的加拿大公司，其在旋转机械状态监测方面的专业知识。他们活动的重点主要是旋转机器，这些机器是安装在地面上的电力系统的一部分。拟议的研究将使所需的研究和调查能够将IRIS开发的局部放电检测和分析方法扩展到“更电动”的飞机上使用电机的情况。这项拟议研究的主要目标是启动马尼托巴大学麦克马思高压实验室和IRIS Power之间的合作，使IRIS Power能够扩大他们的技术在高空和低气压下的局部放电检测和分析中的适用性，以监测现代“更电动”的飞机，并将其活动范围扩展到航空工业。

The growth of electrical equipment in modern 'more-electric' aircraft is achieved by increasing the voltage ofthe electrical power supplies. Electrical stress on the insulation system increases as the voltage increases, andresults in partial discharges (PD). At higher voltages, the partial discharges will be disruptive and lead toinsulation failure. The integrity of the electrical insulation system of more-electric aircraft is a serious concernunder operating conditions of higher electric stress and low air pressure. An aircraft experiences a wide rangeof operating pressures during ascent and descent. The pressure at high altitudes of 33,000 to 46,000 feet (10 to14 km) drops to as low as 30% of the pressure at ground level. It is known that the dielectric strength of airdecreases with altitude, and this increases the risk of partial discharges. The performance of the electric powersystem components of an aircraft must be reliable at high altitude under sub-atmospheric pressures. Because ofthis, PD activity measurement under sub-atmospheric pressures has been a topic of interest for the evaluationof aircraft insulation system.The industrial partner of this research project, IRIS Power, is a Canadian company that is internationallyrecognized for their specialization in condition monitoring of rotating machines. The focus of their activitieshas been mostly on rotating machines that are part of an electric power system installed at the ground level. Theproposed research will enable the study and investigation required to expand the PD detection and analysismethods developed by IRIS to the case of motors employed in 'more-electric' aircraft. The main objective of theproposed research is to initiate a collaboration between University of Manitoba's McMath High Voltage Laband IRIS Power that will enable IRIS Power to expand the applicability of their techniques to PD detection andanalysis at high altitudes and low air pressure for monitoring modern 'more-electric' aircraft and extend thescope of their activities to aeronautic industry.