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To understand the space charge formation of nano-sized magnesium oxide (MgO)/low-density polyethylene (LDPE) nanocomposite materials, the space charge and the conduction current up to the breakdown has been investigated under increasing DC ramp field. A negative charge was dominated in the 0 phr sample. A positive charge was dominated in nanocomoposite sample. The field increment (= the maximum field...
To understand the space charge formation of nano-sized magnesium oxide (MgO)/low-density polyethylene (LDPE) nanocomposite materials, the space charge up to the breakdown has been investigated under DC increasing ramp field. A negative charge was dominated in 0 phr sample. A positive charge was dominated in nano-composite sample. The field increment (= the maximum field - the average field) of 0 phr...
Polyethylene (PE) is widely used as an insulating material for power cable. The simultaneous observation system for electroluminescence (EL) and dissipation current waveform of polymeric film has been developed by authors. By using this system, the simultaneous observations in low-density polyethylene (LDPE) film were carried out at 50, 100 and 200 Hz, respectively. The frequency dependence of the...
A nano-composite material is attracting many researchers' attention in the field of dielectric and electrical insulation. The purpose of this study is to investigate the influence of MgO filler size on electrical properties of MgO/LDPE nanocomposite. The volume resistivity, DC breakdown strength and the impulse breakdown strength of low-density polyethylene (LDPE) containing nano-filler or micro-filler...
This paper deals with a water tree retardant characteristic of magnesium oxide (MgO) nano-filler addition to a low-density polyethylene (LDPE) and a cross-linked polyethylene (XLPE). Water tree retardation of both LDPE and XLPE at 313 K was improved with adding the MgO nano-filler at the content of more than 2 phr, while it was almost the same level at the nano-filler content of less than 2 phr. From...
Recently, authors have developed the simultaneous observation system which is combined a photomultiplier tube (PMT), a high performance CCD camera and the dissipation current waveform detecting circuit. In this study, the observations of the dissipation current waveform and EL of LDPE/MgO nanocomposite material under AC high field were carried out. LDPE and the concentration of LDPE/MgO nanocomposite...
To understand basic electric properties of nano-sized magnesium oxide (MgO)/low-density polyethylene (LDPE) nanocomposite under DC voltage application, the volume resistivity, the space charge distribution, the breakdown strength and the short circuit tree were investigated. By the addition of nano-sized MgO filler, both the DC breakdown strength and the volume resistivity of LDPE increased. At the...
A nanocomposite material of magnesium oxide (MgO) added to a low-density polyethylene (LDPE) was subjected to electrical tree breakdown investigation. The LDPE without nano-fillers was lower in breakdown voltage than the LDPE added with nano-fillers. The breakdown voltage was increased by increase of nano-filler concentrations in LDPE. This result much coincided with the result on tree inception voltage...
Antistatic agent is often used for avoiding electrification of polymer films. In some cases, the film has a double-layer structure to improve its adhesive property. As an example, an ethylene-vinylacetate copolymer (EVA) film, in which an antistatistic agent is mixed, is laminated with a low-density polyethylene (LDPE) film. In such a case, there is a possibility that the antistatic property of the...
We have been studying the breakdown characteristic of air-polymer composite insulation under repetitive pulse voltage application using needle-plane electrode system. The purpose of this study is to clarify the effect of heat by discharge on breakdown of air polymer composite insulation. The effect of thermal insulation between low density polyethylene (LDPE) film and plane electrode was investigated...
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