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

在现代“更电动”的飞机上，电气设备的增长是通过增加电源电压来实现的。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，局部放电将造成破坏并导致绝缘失效。在高电应力和低气压条件下，高电动飞机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要承受很大范围的操作压力。在海拔33,000至46,000英尺（10至14公里）的高空，气压会下降到地面气压的30%。众所周知，空气的介电强度随高度而降低，这就增加了局部放电的危险。飞机的电力系统部件的性能必须在亚大气压力下的高空可靠。正因为如此，在亚大气压下PD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是一家加拿大公司，该公司在旋转机械状态监测方面的专业知识在国际上得到认可。他们活动的重点主要是安装在地面上的电力系统的一部分旋转机器。拟议的研究将使IRIS开发的PD检测和分析方法扩展到“更电动”飞机中使用的电机所需的研究和调查成为可能。拟议研究的主要目标是启动马尼托巴大学McMath高压实验室和IRIS Power之间的合作，这将使IRIS Power能够将其技术扩展到高海拔和低气压下的PD检测和分析，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.