The Effect of Polymer Material Properties on Partial Discharge Vibration Signals Using EYDF-π PSG

To detect partial discharge (PD) signals generated by polymer insulation in power equipment, the generation and propagation characteristics of PD vibration signals are studied in polymer materials. First, the generation and propagation of PD vibration signals in polymer insulation are described as a second-order model. Then, based on the theoretical analysis, dynamic mechanical analysis, and acoustic propagation, experiments reveal that polymers with a higher Young's modulus exhibit a lower initial amplitude of the vibration signal generated by PD. Meanwhile, polymers with higher viscous damping not only display smaller initial vibration amplitudes and greater propagation attenuation but also demonstrate shorter signal durations. Furthermore, the phenomenon has been found and confirmed that crystallization plays a crucial role in vibration propagation in polymer materials. Increased crystallinity will lead to an increase in the viscous damping coefficient of polymers. Finally, erbium and ytterbium co-doped \pi phase-shifted grating laser was used to measure PD vibration signals. Vibration signal detection experiments are finished in crosslinked polyethylene (XLPE) and methylsilicone rubber (MQ), respectively. Compared to XLPE material with a higher modulus value and viscous damping coefficient, PD vibration signals are easily detected in MQ material.