Electric field grading of gas insulated switchgears with microvaristor composites

Effect of permittivity variation on surface flashover of GIS epoxy spacer model in SF<inf>6</inf> gas

“…Advanced insulation techniques, such as dielectric coatings, functionally graded materials (FGM), non-linear resistive materials (NRM), etc., have been recently studied for miniaturizing a GIS [1]- [3]. Nano/micro composites (NMC) is also effective for electric field grading and then reduction in the size of GIS, while there are few reports on the field grading of GIS spacer using nano/micro composites.…”

Nonlinear Electrical Conduction in Polymer Composites for Field Grading in High-Voltage Applications: A Review

“…Other applications of electric field-grading materials have been reported for gasinsulated switchgears. For example, Matsuoka et al [47] worked with the model shown in Figure 55a, where a material with nonlinear resistive material was applied to a cone spacer for gas-insulated switchgears. The comparison of the electric field at the triple junction (ETJ) between materials with and without the nonlinear resistive material is shown in Figure 55.…”

Some aspects of medium voltage switchgear designing with aid of numerical analysis

“…The boundary-value problem under consideration is described by equations and formulas (10)- (14). Joule heating (Ohmic losses) sources are given as follows:…”

“…Therefore, traditional designing methodologies (used still in many factories) are replaced gradually by computer simulations that are more precise and efficient. Such a situation concerns also designing process of compact gas insulated switchgears (GIS) [6][7][8][9][10][11][12][13][14][15][16]. Computer simulations shorten the GIS designing process and bring down the costs involved in the building of prototypes and their laboratory tests.…”