Space charge dynamics under AC stress is of importance as a majority of high voltage cables are under AC stress, and space charge is the driving mechanism of dielectric degradation under these conditions. Bipolar charge transport model is used to simulate space charge dynamics in polyethylene under AC stress. The current density, electroluminescence intensity and space charge density under sinusoidal, triangular and square voltages are compared. It is found that there is no phase shift between current density, electroluminescence intensity and applied voltages, which disagrees the results of Baudoin et al. The thickness of space charge layer under AC stress is much thinner that under DC stress.

AC应力下的空间电荷动力学非常重要，因为大多数高压电缆都处于AC应力下，而空间电荷是这些条件下电介质降解的驱动机制。双极电荷传输模型用于模拟交流电应力作用下聚乙烯中的空间电荷动力学。比较了正弦，三角和正方形电压下的电流密度，电致发光强度和空间电荷密度。发现在电流密度，电致发光强度和施加的电压之间没有相移，这与Baudoin等人的结果不一致。在交流应力下，空间电荷层的厚度要比在直流应力下要薄得多。