Impact of poor power quality on stress grading system of cable termination

Renewable energy penetration is on the rise in the Ontario distribution network. Renewable energy sources such as wind farms and solar PV system have poor power quality, therefore, it is expected that it will hamper the power quality of the grid. The insulation system is vulnerable to the steady state power quality issues. Poor power quality can have adverse effects on cable accessories such as cable joints and terminations. The impact of poor power quality on the SG layer of cable termination and electric field concentration on the surface of cable termination is identified in this paper. In particular, the effect of distorted voltage waveforms on cable termination is studied considering the penetration of odd harmonics from 3^rd to 15^th harmonic at 10%, 20%, and 30% level. The cable termination is diagnosed with electrostatic voltmeter (ESV) that measures potential on the surface of the cable termination.