Space Charge Phenomena inside Solid Insulation under Different Voltage and Temperature Conditions

抄録

The space charge characteristic of Polyimide (PI) material under different voltage conditions is experimentally studied in this paper. Combined with the PEA method and the IEC Standard, the protection capacitor and resistor are adjusted to 187 pF and 333 kΩ for high-frequency voltage applications. Further experimental results find that, positive charge easily accumulates inside the PI material under rectangular wave voltage and room temperature, and the accumulated charge amount under negative conditions are larger than that under positive ones. Meanwhile, positive charge is more likely to accumulate under positive voltages with low frequencies, while it easily accumulates under negative voltages with high frequencies. When the temperature increases, the space charge injected from the grounded electrode increases obviously under DC voltages. In contrast, it is inferred that under rectangular wave voltages, more negative charge exists inside the sample with temperature. The measured results under different voltage conditions can provide guidance for material research in the corresponding application environment.