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Space charge accumulation and conduction current in low density polyethylene (LDPE) incuding cumylalcohol under dc high electric field were investigated using improve PEA (pulsed electro-acoustic) measurement system. In the bulk of XLPE that is being used for power transmission cables, there remain some chemical residues of crosslinking by-products such as α-methylstyrene, acetophenone and cumylalcohol...
We have investigated the space charge distribution in low density polyethylene (LDPE). Under high dc electric field, a huge amount of positive packet like charge is observed in LDPE. It moves towards the counter electrode under high dc electric field, and then the breakdown finally occurs. The reason of the generation of the packet like charge is thought that there are two different conductivity in...
Composite insulation system of liquid nitrogen (LN2) and solid insulator, which are widely employed in high-temperature superconducting power equipments, can be deteriorated by partial discharge (PD) generated in highly stressed region such as a triple junction. To investigate the PD mechanism, an individual current waveform of PD generated around the triple junction in LN2 or gaseous nitrogen (GN...
This paper is mainly concerned with end to-end performance from the viewpoint of measurements using active probes. Since probes are merely trains of packets, packet-level modelling and simulation may intuitively appear to be the best solution. However, given the poor scalability of packet-level simulation, modelling of end-to-end paths at the scale defined by NGN is unfeasible. This spawns the problem...
For HTS (high-temperature superconductor) applications to electric power devices, superconductors are subjected to short-circuit fault currents 10 to 30 times the normal operating current. These over-currents will drive the HTS conductors normal and degrade or burn-out the HTS conductors. Therefore it is important to establish a novel thermal stability criterion for over-current pulse drive. In this...
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