US 4,554,399 A · Particle trap for compressed gas insulated transmission systems

Abstract

A particle trap is provided for gas insulated transmission lines having a central high voltage conductor supported within an outer coaxial conductive sheath by a dielectric support member. A cavity between the inner conductor and outer sheath is filled with a dielectric insulating gas. A cone-like particle deflector, mounted to the inner conductor, deflects moving particles away from the support member, to radially outer portions of the cavity. A conductive shield is disposed adjacent the outer sheath to form a field-free region in radially outer portions of the cavity, between the shield and the sheath. Particles traveling along the cavity are deflected by the cone-like deflector into the field-free region where they are held immobile. In a vertical embodiment, particles enter the field-free region through an upper end of a gap formed between shield and sheath members. In a horizontal embodiment, the deflector cone has a base which is terminated radially internally of the shield. Apertures in the shield located adjacent the deflector allow passage of deflected particles into the field-free region. The dielectric support member is thereby protected from contaminating particles that may otherwise come to rest thereon.

Claims19

Dependent claims

In a compressed gas insulated transmission system having an inner high voltage conductor supported within an outer conductive sheath by a dielectric support member, an improved means for trapping at least partially conductive particles traveling in a predetermined direction within a cavity formed between said high voltage inner conductor and said sheath, comprising:

a dielectric particle deflector supported from said inner conductor, and opening radially outwardly along said predetermined direction;
conductive shielding means disposed immediately adjacent said sheath for creating a reduced-electric field region between said shielding means and said sheath;
connection means for electrically connecting said conductive shielding means to said sheath;
said particle deflector arranged to deflect traveling particles between said shielding means and said sheath so as to be positioned in said reduced-electric field region, such that further travel of said particles within said cavity is prevented and said particles are prevented from impinging upon said dielectric support member.

1 more element

In a horizontally oriented compressed gas insulated transmission system having an inner high voltage conductor supported within an outer conductive sheath by a dielectric support member, an improved means for trapping at least partially conductive particles traveling in a predetermined direction within a cavity formed between said inner conductor and said sheath, comprising:

a generally cone-like first dielectric particle deflector secured to said inner conductor and having a free-end base portion which opens radially outwardly along said predetermined direction;
conductive shielding means disposed immediately adjacent said sheath for creating a reduced-electric field region between said shielding means and said sheath;
connection means for electrically connecting said conductive shielding means to said sheath;
said particle deflector arranged to deflect traveling particles between said shielding means and said sheath so as to be positioned in said reduced electric field region;
and
said shielding means comprises a conductive cylinder having apertures formed therein, such that particles deflected by said deflector are directed through said apertures to said field-free region such that said particles are trapped from traveling further and are prevented from impinging upon said dielectric support member.

3 more elements

Dependencies are inferred from the claim text.

Particle trap for compressed gas insulated transmission systems

Life of this patent

Particle trap for compressed gas insulated transmission systems

Life of this patent

Abstract

Claims19