Abstract
The operation environment of electric power cables undergoes more and more natural damages, such as earthquake, flood which would result in the change of unit capacitance and inductance of power cables, as well as the reactive power. In this paper, a method of distributed model based on Poynting vector and space-stepping finite difference frequency domain (FDFD) is proposed to calculate the reactive power of power cables. Comparing with the method of lumped model, it can calculate the reactive power of power cables without computing the unit capacitance and inductance which are difficult to get, especially when the cable trench is fill with ponding, sludge and collapse. Calculation of the reactive power has been carried out in consideration of eccentric and water infiltration cases, and results indicate that ponding environment will lead to a substantial increase of capacitive reactive power. Capacitive reactive power increase with cable eccentricity degree; when cables suffer both water ingress and a 2.5 mm eccentricity degree, the increased capacitive reactive power will reach 51.98%.
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