scholarly journals Minimisation of electric field stress at triple junction of a functionally graded cone type spacer in a gas insulated busduct with metal inserts

High Voltage ◽  
2017 ◽  
Vol 2 (2) ◽  
pp. 110-118 ◽  
Author(s):  
Yerra Swamy Naidu ◽  
Gundavarapu Venkata Nagesh Kumar
Keyword(s):  
Electric Field ◽  
Triple Junction ◽  
Functionally Graded ◽  
Field Stress ◽  
Cone Type

scholarly journals Study of electric field stress on the surface contour and at the triple junction in three phase GIS with FGM spacer under the depression defect

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Janaki Pakalapati ◽  
Venkata N. Kumar Gundavarapu ◽  
Deepak Chowdary Duvvada ◽  
Sravana Kumar Bali
Keyword(s):  
Electric Field ◽  
Triple Junction ◽  
Dielectric Strength ◽  
Functionally Graded ◽  
Uniform Electric Field ◽  
Filler Materials ◽  
Field Stress ◽  
As Doping ◽  
Three Phase ◽  
Graded Material

AbstractNow days, the establishment of spacers is in wide usage in three-phase Gas Insulated Busduct (GIB) for providing mechanical support and better insulation to the conductors. The region of the intersection of SF6 gas, enclosure end and the spacer is one of the weakest links in GIB, so the major concentration is done on minimization of electric field stress at this junction by using Functionally Graded Material (FGM) technique. The other incidents of insulation failures are due to several defects like depression, delamination etc. reduces the dielectric strength of the spacers. In this paper, an FGM post type spacer has been designed for a three-phase GIB under depression and further electric field stress at Triple Junction (TJ) is reduced by introducing a metal insert (MI) nearer to the TJ. Several filler materials are used as doping materials for obtaining different permittivity values using FGM technique to achieve uniform electric field stress. Simulation is carried out for the designed spacer at various operating voltages with different types of FGM gradings. The effect of depression with different dimensions and positions is analyzed before and after inserting MI to the FGM post type spacer in three-phase GIB.

scholarly journals Impact of Lightning Impulse on Electric Field Stress of Spacer in Single Phase Gas Insulated Busduct

2019 ◽  
Vol 8 (2S3) ◽  
pp. 837-842
Keyword(s):  
Electric Field ◽  
Power Systems ◽  
Triple Point ◽  
High Reliability ◽  
Moderate Pressure ◽  
Field Stress ◽  
Cone Type ◽  
Lightning Impulse ◽  
Reliable Power Supply ◽  
The Impact

During the last two decades, for reliable power supply, GIS have found a broad range of application in power systems because of their high reliability, easy maintenance, small space requirement, etc. Gas insulated sub-stations employs a superior dielectric gas, SF6 at moderate pressure for phase to phase and phase to ground insulation. Several troubles and system outages in GIS have been reported world-wide due to insulation failures which resulted in the intensification of electric field along the spacer surface and especially at the triple point electrode – spacer – gas. Hence, it was required to reduce the rate of insulation failure. In this work, Conventional cone type spacer geometry is taken for which field study has been done. Electric field stresses developed by the cone type spacer on the surface of the spacer and also at the triple junction is determined. It is found that the electric field stress at the surface of the spacer is maintained uniform, the electric field stress at the critical junctions formed by the conductor, solid insulator and SF6 gas is not maintained at minimum value. Metal inserts are considered as a means to reduce the stress at the triple point junction. The impact of Lightning Impulse on the Electric Field Stress along the spacer is carried and the reduction of stress is mitigated with the insertion of Metal Inserts.

scholarly journals Electric Field Stress in a Three Phase Common Enclosure Gas Insulated Busduct with FGM Post Type Spacer and Reduction with Metal Inserts

2020 ◽  
Author(s):  
Polamraju V. S. Sobhan ◽  
Janaki Pakalapati ◽  
Venkata Nagesh Kumar Gundavarapu ◽  
Deepak Chowdary Duvvada ◽  
Sravana Kumar Bali
Keyword(s):  
Electric Field ◽  
Shape Control ◽  
Vital Role ◽  
Functionally Graded ◽  
Surface Shape ◽  
Filler Materials ◽  
Uniform Field ◽  
Field Stress ◽  
Surface Flashover ◽  
Three Phase

AbstractThe establishment of supporting insulators plays a vital role in the continuous operation of the three-phase Gas Insulated Busduct (GIB), which primarily depends on the distribution of electric field stress on the spacer surface. Shape control is a technique used along the spacer surface to achieve uniform field intensity, but this technique can also lead to very irregular shapes. The Triple Junction (TJ) is the region where the field stress has to be reduced. Over a period, high field stresses along the spacer surface will result in a surface flashover and thus de-energize the complete GIB, leading to enormous losses economically. In this paper, a Functionally Graded Material (FGM) spacer for a three-phase GIB has been designed with more number of gradings and further field stress at TJ is minimized by inserting and reshaping the metal inserts (MI) at the end of the enclosure. By doping them with different permittivity values, functionally graded materials are spatially distributed with multiple filler materials to achieve uniform stress on the electric field. Simulation is carried out with the FGM and epoxy (post type) Spacers for different voltages and FGM gradings. With MI, the stress is minimized and an enhanced uniform field allocation along the surface is obtained.

Application of functionally graded material for reducing electric field on electrode and spacer interface

2010 ◽  
Vol 17 (1) ◽  
pp. 256-263 ◽  
Author(s):  
Muneaki Kurimoto ◽  
Katsumi Kato ◽  
Masahiro Hanai ◽  
Yoshikazu Hoshina ◽  
Masafumi Takei ◽  
...  
Keyword(s):  
Electric Field ◽  
Functionally Graded Material ◽  
Functionally Graded ◽  
Graded Material

Functionally Graded Polymeric Composites Having Micro-Tailored Structure Formed by Electric Field

Materials ◽  
2003 ◽  
Author(s):  
Geun Hyung Kim ◽  
Daniel K. Moeller ◽  
Yuri M. Shkel
Keyword(s):  
Mechanical Properties ◽  
Electric Field ◽  
Functionally Graded Materials ◽  
Applied Electric Field ◽  
Polymeric Composites ◽  
Functionally Graded ◽  
Graded Materials ◽  
Functionally Graded Composites ◽  
Liquid Suspensions ◽  
Redistribution Effect

A solid composite having locally micro-tailored structure can be produced by curing liquid polymeric suspensions in an electric field. The redistribution effect of the field-induced forces exceeds the effect of centrifugation, presently employed to manufacture functionally graded materials. Moreover, unlike centrifugational sedimentation, one can electrically rearrange the inclusions in desired targeted areas. The applied electric field can be employed to produce a composite having uniformly oriented structure or only modify the material in selected regions. This technology enables polymeric composites to be locally micro-tailored for given design objectives. We discuss electrical and rheological inteactions in liquid suspensions. Relationships between microstructure and mechanical properties of the obtained functionally graded composites are presented.

Electric Field Stress Optimization of Permittivity Graded Spacer in UHVAC Gas Insulated System

2019 ◽  
Author(s):  
Jacob P Varghese ◽  
Avinash Nelson Asokan ◽  
Subham Khatua ◽  
P Preetha ◽  
R Sunitha
Keyword(s):  
Electric Field ◽  
Field Stress ◽  
Stress Optimization
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