Space Charge Transport of $\boldsymbol{\text{Al}_2 \mathrm{O}_3}$ /Silicone Rubber Composites Under Thermal Aging

Silicone rubber (SIR) has been widely used in the insulation of cable accessories due to its excellent performance. In this paper, pure SIR and nano $\boldsymbol{\text{Al}_2 \mathrm{O}_3 / \text{SIR}}$ composites are thermally aged for 0–80 days at $\boldsymbol{200^{\circ} \mathrm{C}}$. The effects of long-term thermal aging on the space charge transport are analyzed. The results show that with the increase of thermal aging time, the accumulation of heteropolar charge of pure SIR and nano $\boldsymbol{\text{Al}_{2}\mathrm{O}_{3}/\text{SIR}}$ composites gradually decreases and changes to the accumulation of homopolar charge. Compared with pure SIR, the space charge accumulation of $\boldsymbol{\text{Al}_{2}\mathrm{O}_{3}/\text{SIR}}$ composites decreases significantly and changes little with the increase of thermal aging time. It is believed that when doped nano $\boldsymbol{\text{Al}_{2}\mathrm{O}_{3}}$ in SIR, the increase of carrier mobility and the introduction of metal oxides reacting with fallen free radicals to form stable compounds both lead to less space charge accumulation of $\boldsymbol{\text{Al}_{2}\mathrm{O}_{3}/\text{SIR}}$ composites.

[1]  Yuanxiang Zhou,et al.  Space charge evolution and its effects on electrical tree degradation in silicone rubber at varied temperature under polarity reversal voltage , 2022, Journal of Electrostatics.

[2]  R. Liao,et al.  Multi-dimensional Analysis and Correlation Mechanism of Thermal Degradation Characteristics of XLPE Insulation for Extra High Voltage Submarine Cable , 2021, IEEE Transactions on Dielectrics and Electrical Insulation.

[3]  B. Du,et al.  Effect of Mechanical Stretching on Nonlinear Conductivity and Dielectrics Breakdown Strength of SiR/SiC Composites , 2021, IEEE Transactions on Dielectrics and Electrical Insulation.

[4]  J. Kindersberger,et al.  Effect of Surface Layer on the Space Charge Accumulation in Epoxy Samples under DC Stress , 2020, IEEE transactions on dielectrics and electrical insulation.

[5]  Weifeng Sun,et al.  Interface Damages of Electrical Insulation in Factory Joints of High Voltage Submarine Cables , 2020, Energies.

[6]  Kai Wu,et al.  Space charge behavior in polymeric materials under temperature gradient , 2020, IEEE Electrical Insulation Magazine.

[7]  M. Ese,et al.  Compatibility of liquid and solid insulation materials for high voltage subsea connectors , 2019, IEEE Transactions on Dielectrics and Electrical Insulation.

[8]  Avinash Nelson Asokan,et al.  Effect of interphase on dielectric relaxation mechanisms in , 2019, IEEE Transactions on Dielectrics and Electrical Insulation.

[9]  Ge Li,et al.  IEEE Transactions on Dielectrics and Electrical Insulation , 2016 .

[10]  M. Pettersson,et al.  Dielectric properties and partial discharge endurance of polypropylene-silica nanocomposite , 2010, IEEE Transactions on Dielectrics and Electrical Insulation.