efiel_sf6 - 204 Volpou: Electric Field Modeling and Field...

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204 Volpou: Electric Field Modeling and Field Formation Mechanism in HYDC SF, Gas Insulated Systems Electric Field Modeling and Field Formation Mechanism in HVDC SF, Gas Insulated Systems IIvgeni Volpov Transmission & Substations Division Israel Electric Corporation Lld. Haifa 31000, Israel ABSTRACT This paper reports on the electric field behavior in INDC SF, gas insulated sys- tems. In the field model definitions, the SF,/epoxy interfaces are assumed as thin slightly conducting layers with non-zero thickness. The boundary conditions in- volving surface-reduced parameters of these layers are adopted. This allows avoid- ance of problems of calculation regarding the proximity of interfaces between sub- domains. The boundary-value problem describing capacitive-resistive time-varying electric field is formulated. On this basis, the transient HVDC electric field model and time domain-calculating algorithm are COnStructed. The model accounts si- multaneously for both the surface layer properties and bulk conduction parame- ters of the hounding dielectrics, while surface conductivity may be specified as a non-linear or an arbitrary funclion. The method employs direct integration of a continuity equation in the time domain with the calculation of an electrostatic field approximation at each integration step. The basic features and applicability of the method are discussed. The model has been applied for analysis of HVDC electric field formation mechanism in SF,/epoxy insulation. It is demonstrated that charge accumulation phenomena cannot he described hy a single time-stable mechanism. Some directions regarding further development of the field model and calculating algorithm are suggested. Index Terms - HMC SF, GIS, epoxy spacer, interface layer, quasi-stationary electric field, time domain simulation, boundary conditions, surface charge accu- mulation, surface and volume conductivity, field formation mechanism. 1 INTRODUCTION N recent years, there has been a resurgence of interest are the opportunity to transmit large blocks of power over long distances, keeping high system stability, ecological as- pect advantages and attractive economical benefits pro- vided by modern HVDC technological solutions (HVDC links, submarine cables, etc.). In view of increased effects to conserve environmental quality, fully encapsulated and compact HVDC gas insu- lated systems (GIS) have become a desirable and justified component in the above installations. The design of a reli- able HVDC SF, GIS or other HVDC gas insulated (equip- ment normally includes coordination of dielectric strength of their insulating systems. This task requires trustworthy information concerning the electric field distribution io these apparatus. However, experience has shown that electrostatic (capacitive) field calculating methods, which I.
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efiel_sf6 - 204 Volpou: Electric Field Modeling and Field...

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