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A modified method is proposed to directly determine the trap energy distribution in dielectrics after high electric field charge injection based on thermally stimulated current (TSC) measurement. Firstly, through a series of equation derivation, it is found that obtaining trap energy distribution from measured TSC data becomes solving a nonnegative least squares problem. Then, an iteration algorithm...
This study describes a modified pulsed electroacoustic (PEA) system, which can measure the space charge distribution in dielectric films at low temperatures. The temperature around the sample is controlled by the liquid nitrogen, an electric heating coil as well as a PID temperature controller. The space charge distribution of DC stressed cross-linked polyethylene (XLPE) with the thickness of ∼300...
The physical interface between two dielectrics has been acknowledged as the weak point of the double-layered insulation system. In order to investigate the effect of the interface on the conduction characteristics of the double-layered insulation system, the time-varying currents of XLPE, ePdM and double-layered XLPE/EPDM are measured under various electric fields at 50 X!. Besides, it is found that...
To evaluate the thermal aging effect on space charge dynamics and carrier transport characteristics in cross-linked polyethylene (XLPE), films with the thickness of ∼300 μm are thermally aged at 120 °C for 36, 84, 168 and 252 hours, respectively. And then, the simultaneous measurement of space charge and conduction current is employed by our developed system, which overcomes the defect of the weak...
To overcome the weak correlation between space charge and conduction current caused by individual measurement, a specialized system based on pulsed electro-acoustic method (PEA) was designed to perform simultaneous measurement of space charge and conduction current for plate sample. Firstly, electric pulse response during space charge measurement was simulated to analyze the interference during conduction...
Polarization, charge transport, breakdown, space charge and other electrical phenomena have been studied under a quantum level. Several theories and codes based on Schrodinger equation have been applied. However, there are inevitable defects in these methods, e.g. excessive simplification, which is not reasonable when studying electrical phenomena. This paper is to study electron behavior under electric...
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