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access icon free Breakdown process experiments of cap-and-pin insulators and their EMT leader progression model implementation

© The Institution of Engineering and Technology
Received 26/06/2017, Accepted 13/09/2017, Revised 16/08/2017, Published 13/09/2017

Here, breakdown tests of cap-and-pin glass insulators with arcing horns, conducted at two different HV labs, are presented. Since only volt–time curves are measured, a curve-fitting approach to determine leader progression model parameters is taken, which involves modelling of the impulse generator in detail and inclusion of the Motoyama model to simulate the breakdown. Furthermore, a comparison of the breakdown simulation results with LPM parameters for a pure air gap and the measurements is accomplished. Finally, a curve-fitting procedure is developed to fit the resulting volt–time curves from simulations to the measurements.

Inspec keywords: pulse generators; curve fitting; insulators; arcs (electric)

Other keywords: HV labs; cap-and- pin glass insulator breakdown process experiments; impulse generator modelling; volt–time curves; arcing horns; EMT leader progression model implementation; leader progression model parameter determination; Motoyama model; LPM parameters; breakdown test; curve-fitting approach

Subjects: Power line supports, insulators and connectors; Pulsed power supplies; Dielectric breakdown and discharges; Interpolation and function approximation (numerical analysis)

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