STUDY THE EFFECT OF METALLIC PARTICLE ON DIFFERENT SPACER IN A CO-AXIAL DUCT AT DIFFERENT PLACES

Abstract

Particle accelerators can be placed in two general classes, those which operate by direct time varying electric or
magnetic fields. The following discussion will relate primarily to the direct acceleration machine where the maximum
particle energy is determined by the voltage which can be insulated. In this work, it is proposed the breakdown of air gaps in
a co-axial geometry, due to the presence of metallic particle has been studied. Bare copper wire particles of different lengths
have been introduced in to a co-axial geometry and breakdown strength of air gap has been estimated. The testing high ac
voltage, positive dc voltage and negative dc voltage is carried out. The study repeated with dielectric covering to the control
conductor. When a sufficiently high electric field is applied to a gas, avalanche ionization (TOWNSEND PROCESS) occurs
which will lead to breakdown. Gas insulated systems are extensively used in air insulated system due to advantages of weight
and volume reduction, limited overall space requirements and easy maintenance. Even though case wise, GIS is very
expensive has compared to AIS, it is preferred because of better service, more reliable performance and facility of higher
operating stresses. In recent years, SF6 has been considered to green house gas and hence, all round efforts are made to
reduce emission of SF6 gas in to the atmosphere. This was successfully used in GITL (gas insulated transmission lines) and
experimental lines of few kilometers lengths are available