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.
Impedance/dielectric spectroscopies
electrical characterization
Characterization
impedance/dielectric spectroscopy
Insulating materials
higher harmonics
Electrical field
Dielectric spectroscopy
field grading materials
Dielectric materials
Insulation materials
nonlinear insulation materials
Electrical behaviors
Small amplitude
Insulation
Grading
Filled polymers
Current voltage characteristics
Steady state voltage
Författare
T. Christen
ABB
Thomas Andritsch
ABB
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)
Ämneskategorier (SSIF 2011)
Annan elektroteknik och elektronik
DOI
10.1109/ICD.2016.7547749
ISBN
978-150902802-3