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We measured space charge and external circuit current simultaneously in XLPE sandwiched by semi-conductive layers. Space charge accumulation characteristics are important factor to develop a DC power transmission cable. Many research works have been carried out using pulsed electro-acoustic (PEA) method to investigate the space charge behavior in insulating material like cross-linked polyethylene...
We measured space charge and external circuit current simultaneously in XLPE sandwiched by semi-conductive layers. Space charge accumulation characteristics are important factor to develop a DC power transmission cable. Many research works to investigate the space charge behavior in insulating material like cross-linked polyethylene (XLPE), which is a typical base insulating material for the DC cable,...
Printed circuit boards for communication equipment have been promoted by mounting circuits in them with higher-density. It is said that an ECM (Electro Chemical Migration) generates in the insulating material when a high electric stress is applied to the board material under high temperature with high humid condition. Since the ECM degrades the insulation properties of it, it is necessary to use a...
Recently, it is required for electronic device that an insulating material which shows an excellent characteristic at high temperature under high DC stress. In this study, we focused on insulating properties of Dicyclopentadiene (DCP) resin. The DCP resin shows a good thermal property and it is expected to be used as a molded insulating material alternative to the epoxy resin because of its superior...
As a long distance DC power transmission cable, XLPE (cross-linked polyethylene) insulated cable is considered to be used. Since the cable is supposed to be used at high-temperature because a large current flows in inner conductor, it is necessary to estimate the performance of the insulating material at high temperature. Especially, characteristics of a space charge accumulation and a conduction...
Irradiating an electron beam to the ETFE, it is thought that electron-hole pairs are generated inside the sample. However, there is no reported cases about this problem. Therefore, by using a blocking layer to block the charge injection from the outside, an inside of an irradiated sample electron-hole pairs were investigated whether it is produced in the DC stress.
The mechanism of charge injection, the interface charge transfer between LDPE and SC (semi-conductive) or Al electrode, was investigated by using the density function theory (DFT) of Gaussian 09. The electric dipole layer between electrode (Al or SC) and LDPE is created after contact because Fermi levels between the LDPE and electrodes are difference. As the barrier height of hole injection (ϕBh=1...
A positional resolution of space charge measurement system of a pulsed electro acoustic (PEA) method is tried to improve using a newly designed upper electrode unit and a new pulse generator. The improved upper electrode unit with a good terminator contribute to reduce the inductance and it results in reduce a noise. Moreover, in order to apply a pulse voltage to a sample efficiently using a newly...
We investigated the relationship between the space charge accumulation characteristics and the breakdown in various combination of multilayered polyimide samples under dc stress using the pulsed electro acoustic (PEA) method. In recent years, there are many examples which a multilayered polyimide film is used as the flexible Printed-Circuit Board (PCB) inside an advanced electronic devices or motor...
The relationship between an electrical breakdown and a space charge accumulation in low-density polyethylene (LDPE) and cross-linked polyethylene (XLPE) was investigated under high dc stress using the pulsed electro-acoustic (PEA) measurement system with a circuit for an external current measurement. It has been found that the space charge accumulation strongly affects the breakdown characteristics...
Since the space charge accumulation sometimes enhances the electric field in an insulating material, it can be thought as a reason of unexpected PD (partial discharge) generation. Therefore, measurements of the space charge in the insulating layer of the winding are required. The space charge accumulation in the insulating material is usually carried out using the PEA (pulsed electro-acoustic) method...
We have observed space charge profiles using the PEA (pulsed electro-acoustic) system in low density polyethylene (LDPE) and cross-linked polyethylene (XLPE) under high electric dc field to study a relationship between space charge behavior and dielectric breakdown. XLPE, which is used as an insulating material of ac power cable, is also expected to be applied as the insulating layer of DC long distance...
Effect of electron beam irradiation on dielectric properties in various insulating materials for spacecraft is investigated using PEA (Pulsed Electro-Acoustic) method. In space environment, spacecraft is exposed to plasma or radioactive-rays. In such condition, multilayer insulating materials covering the spacecraft are charged up. Sometimes the charge accumulation causes to the serious damage to...
Recently, the switching frequency of motors for automotive and railway cars are increased according with the innovation of power semiconductor technology. When the switching speed is increased, so called “inverter surge voltage” is increased, then the coating insulating materials are degraded due to the high voltage phenomena like partial discharge, dielectric heating and space charge accumulation...
For an insulation layer of a DC power transmission cable, space charge properties of various insulating materials have been investigated using pulsed electro acoustic (PEA) method. Especially, cross-linked polyethylene (XLPE), which has an improved heating resistance by forming a bridge between molecular chains of low density polyethylene (LDPE), is expected to be applied to the insulating layer of...
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