Ostalo
Parameter Influences on HVDC Transformer Insulation and Its Link to Conduction Processes
Fabian Schober
; University of Applied Sciences Würzburg-Schweinfurt,Institute for Power Engineering and High Voltage Technology
Andreas Krieg
; University of Applied Sciences Würzburg-Schweinfurt,Institute for Power Engineering and High Voltage Technology
Andreas Küchler
; University of Applied Sciences Würzburg-Schweinfurt,Institute for Power Engineering and High Voltage Technology
Marcus Liebschner
; Aalen University, Optics and Mechatronics
Frank Berger
; Technische Universität Ilmenau, Department of Electrical Apparatus and Switchgear
Sažetak
HVDC (high voltage direct current) transmission is an effective way to transport electrical power over long distances by using direct current. The insulation system of HVDC components has to be designed for both AC and DC field distributions. It consists of mineral oil and pressboard. The used insulation material behavior has not been completely understood under DC stress. In this paper, electrical conductivity of pressboard is evaluated and conduction processes are considered. Therefore, conductivity measurements are linked to a number of RC network elements in order to achieve a network model representative for the insulation material behavior under DC stress. Time-constants are determined under different temperatures and different electric field strengths. In addition, the performed simulations provide evaluation of parameters affecting the dielectric behavior of the insulation system oil and pressboard, which are not measured or even cannot be determined by measurements
Ključne riječi
HVDC insulation; pressboard; RC network; step-response measurement
Hrčak ID:
150751
URI
Datum izdavanja:
15.12.2015.
Posjeta: 1.563 *