High-voltage low-frequency dielectric-spectroscopy used for characterization of nonlinear insulation materials
Paper i proceeding, 2016

Common small-amplitude dielectric spectroscopy (DS) is restricted to linear response. We discuss here two concepts of DS at high voltages for characterizing nonlinear insulation behavior relevant for HVDC equipment. The first method uses the higher harmonics of the current, which are naturally generated by nonlinearities. The second method measures small-signal linear response with a superimposed high steady-state voltage, which yields the differential admittance. After a brief introduction to the theoretical prerequisites, experimental results for two illustrative material types are discussed, a polymer-filler composite used for electrical field-grading and a ZnO varistor ceramics used in surge arrestors. Particular focus is on the reconstruction of the current-voltage characteristics. General experimental feasibility of the methods is proven by showing consistency of the different measurements. Additionally, materials with non-robust electrical behavior or very long relaxation times can be identified from inconsistencies, which also provide the limits of the methods.

Filled polymers

impedance/dielectric spectroscopy


Dielectric spectroscopy

Impedance/dielectric spectroscopies

Current voltage characteristics

Dielectric materials

nonlinear insulation materials

higher harmonics

Steady state voltage

electrical characterization

Small amplitude

Insulation materials



field grading materials

Electrical field

Electrical behaviors

Insulating materials


T. Christen

ABB Group

Thomas Andritsch

ABB Group

Louise Almquist

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

1st IEEE International Conference on Dielectrics, ICD 2016, University of Montpellier, Montpellier, France, 3-7 July 2016

Vol. 2 848-851
978-150902802-3 (ISBN)


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