Characterization Of The Polymers Charge Trap By Combination Of Photo Stimulated Discharge And Photo-Luminescence Methods

With the rapid development of China's power industry, the demand for wire and cable industry is rising. How to improve the insulation of the cable material performance has become an important problem that the industry faces. When produced, the wire and cable will introduce space charge, the nature of which plays a very important role in the electric breakdown and aging. Therefore, the research of space charge behavior in the insulation process is particularly important. There are so many methods for the test of space charge, but they have a few shortcomings. How to improve the test method and explore new test means of the space charge has become the key of the current insulation performance study.Photo-luminescence stimulated discharge(PSD) method is one of the important means to study the space charge behavior. The polymer stimulated methods include PSD and PL. The PSD method for the trap energy levels of space charge about insulation has attracted great interests. The photo-luminescence(PL) method is mainly used for rare earth luminescence and address exploration, which rarely for polymer material. And the PL method has rarely reported about the characterization of space charge. What's more, The combination of the PSD and PL method for testing the space charge has rarely reported.The paper combines the PSD and PL method to explore the characterization of space charge trap energy level, which can show more comprehensive charge trap energy distribution information and improve the space charge testing theory and method.The excitation light source in the PSD experiment is NT342-SH wavelength laser that can be adjusted. The test wavelength range for the polyethylene material is from210 nm to 418 nm. The results indicate that the energy level is between 2.48 e V and5.51 e V. PL method uses the xenon lamp as the excitation light source and the wavelength is 160 nm?170 nm?180 nm?225 nm?250 nm?and 300 nm for the PE specimen, respectively. The results show that the spectrum exists obvious red shift phenomenon with the increase of excitation wavelength and the energy level is between 2.48 e V and 5.51 e V. The combination of PSD and PL method give more comprehensive energy distribution of PE, which has important reference value for the research of space charge.