An investigation into the effect of shattered glass discs on insulation strength under HVDC voltage stress

This paper explores the electric field distribution near a string of six NJ120 high voltage insulators through experimental measurements under various conditions. Using a distributed capacitance method with custom probes connected to an Arduino-based system, tests were conducted on clean and polluted insulators. Pollution was simulated using a tuf-based solution with conductivities ranging from 0.5 to 1.97 mS/cm. Measurements were taken at 13 heights and four distances (1 to1.75 m) under applied AC voltages of 15 to 80 kV. The study also investigates the effects of damaged insulators, placed at different positions (near the high voltage terminal, in the middle, and near the ground), as well as the role of guard rings in improving field uniformity. Results indicate that pollution and damaged insulators significantly increased field intensity, particularly near the high voltage terminal. Guard rings effectively reduced field peaks, with larger radii and optimal placement providing the best performance. These findings contribute to optimizing high voltage insulator design for enhanced reliability.

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An investigation into the effect of shattered glass discs on insulation strength under HVDC voltage stress

Cited by 3 publications

References 2 publications

A Parametric Study on the Critical Lightning Currents Causing Flashover to the Overhead Lines of a ±533 kV HVDC Transmission System

A Parametric Study on the Critical Lightning Currents Causing Flashover to the Overhead Lines of a ±533 kV HVDC Transmission System

A Stochastic Model for Evaluating the Lightning Performance of a −400 kV HVDC Overhead Line

Experimental measurement of electric field near the insulator string

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