20 kHz Unipolar Pulsed Field Surface Flashover Characteristics of Polymer Nanocomposites in Subatmospheric Pressure Helium
Küçük Resim Yok
Tarih
2014
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The high performance electrical insulation materials and structures in power systems must be free from unwanted and unpredictable dielectric breakdown through the insulation as well as over the dielectric surfaces, and along the interfaces. Surface flashover, another form of breakdown, usually occurs over the surface of insulator between the energized electrodes, and is usually triggered by the stresses caused by the field at the insulator/electrode/ambient interfaces. Studies of surface flashover at sub-atmospheric pressures are specifically important for aerospace systems and vehicles operating in this regime. In this work we present surface flashover characteristics of two different polymer nanodielectrics filled with either TiO2 or Al2O3 nanoparticles. A 20 kHz pulsed, unipolar field is applied across the electrodes positioned on top of the sample with a 0.5 cm gap distance in sub-atmospheric pressure helium. The plasma characteristics, such as voltage, current and optical emission waveforms are recorded. Breakdown voltage as a function of pressure, frequency and duty cycle of the applied field is presented. Differences between the surface breakdown of TiO2 and Al2O3 filled samples are studied and results are presented. Furthermore, frame-by-frame images of the optical emission during the breakdown events are recorded and presented.
Açıklama
IEEE International Power Modulator and High Voltage Conference (IPMHVC) -- JUN 01-05, 2014 -- Santa Fe, NM
Anahtar Kelimeler
Unipolar Pulsed Field, Nanodielectrics, Surface Flashover
Kaynak
2014 Ieee International Power Modulator And High Voltage Conference (Ipmhvc)
