MOVEMENT OF METALLIC PARTICLE IN A SINGLE PHASE GAS INSULATED SUBSTATIONS WITH VARIOUS RANDOM SOLID ANGLES

Abstract

The excellent insulation properties of compressed
sulphur hexafluoride are adversely affected by metallic
particle contamination in practical gas insulated systems.
The movement of such particles is random and the particles
play a crucial role in determining the insulation behavior of
GIS. The reliability of power transmission and the
introduction of higher voltages to the center of big cities
have been the two key features in the history of GIS.
Compactness, reduction of the number of parts and simple
construction on-site promote the economy of the GIS. To
determine the particle movement in a single-phase Gas
Insulated Bus duct (GIB) an outer enclosure of diameter 137
mm and inner conductor of diameters 40 mm are
considered. Aluminum, copper and silver particles were
considered to be present on enclosure surface. In order to
determine the random behavior of moving particles, the
calculation of movement in axial and radial directions was
carried at every time step using Monte Carlo Technique.
Monte Carlo simulation is also carried out by changing the
random solid angle from 1 degree to 0.2 degrees in steps of
0.2 degrees. The random solid angle is decreased to take
into account more smooth end profile of the particle. The
simulation results have been presented and analyzed.