Abstract
The condition of electrical insulation is significant to the safety of electric power systems, especially to the More Electric Aircraft (MEA) that carries hundreds of people. The property of insulation will be reduced by aging and degradation which caused by partial discharge (PD). This has become a topic of extensive research and investigation. This paper represents the PD detection in terms of Lissajous figures which is a composite of two orthogonal oscillations with integral proportional frequencies. It can be used to calculate the total charge of PD transferred per cycle and the total energy of PD per cycle, thus the average charge and energy of a single PD activity can be recognized accompany with the current pulse PD detection method based on IEC 60270. These parameters could be useful to evaluate whether the insulation was damaged or how badly the damage was, hence to provide references to engineers for insulation condition judgment and design service plan.
Highlights
Modern aviation industry are interested in developing More Electrical Aircraft (MEA) which has larger electric capacity than the traditional aircraft
This paper reports the partial discharge (PD) detection of ETFE insulated twisted pair over a range of pressures using the Lissajous figure analysis
The BC and DA sides can be regarded as the ‘active phase’ of Dielectric Barrier Discharge (DBD) [7], the PD events are occurring in this phase and the sides were observed non-smooth as compared to the ‘passive sides’, as shown in figure 4 which is an result of the experiment
Summary
Modern aviation industry are interested in developing More Electrical Aircraft (MEA) which has larger electric capacity than the traditional aircraft. The increasing electric capacity brings new challenges to the aircraft power system which works at reduced air pressures. The insulation problems are very likely to cause electrical failures, which is greatly influenced by the event of Partial Discharge (PD). PD must be well recognized and monitored in low pressure conditions to protect the electric power system in MEA from electrical failure to avoid possible disasters. There seems to have been little attempts on the condition evaluation of polymer insulation which widely applied in aircraft power system at lower pressures. Polymer insulation is easier to be degraded by ion bombardment caused by PD than other solid insulation such as ceramics and mica [4, 9, 10], and corona discharge as a special type of PD has significant influence to the insulation and cause power loses [11]. Greater PD level generates more ion to cause worse damage to polymer insulation, which can be presented in terms of apparent charge
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