Scaling laws of the lifting height of a conductive particle in a gas insulated switchgear

Abstract

Conductive particles greatly impair the insulation integrity of a gas insulated switchgear (GIS). Factors including applied voltage, frequency of the alternating current, size and coefficient of restitution of the metallic particle, pressurized gas, and sizes of the GIS dramatically influence the particle dynamics. Previous investigations basically focused on certain scenarios, seldom considered the effects from coefficient of restitution, and did not provide universal laws for the particle dynamics. This paper proposes a dimensionless number that considers all the above-mentioned factors, and presents the scaling law between dimensionless mean/maximum lifting height of a charged particle in GIS and the proposed dimensionless number. It is believed that the scaling law together with the dimensionless number can provide guidance and shrink the parameter window for relevant investigations on the GIS with sparsely distributed conductive particles.

Physical mechanism of electrode coatings to suppress wire particle’s firefly motion under DC stress and selecting criterion for in situ applications

“…Gas-insulated equipment will inevitably produce metal particles by mechanical collision, equipment vibration, and motion friction [1][2][3]. Metal particles move under the electric field force and produce a partial uniform electric field, consequently endangering the insulation performance of gas-insulated equipment [4,5].…”

MCTSR: A super‐resolution method for defects in gas‐insulated switchgear X‐ray images based on multi‐scale contextual transformers

“…Gas-insulated switchgear (GIS) is widely used in transformer stations owing to the advantages of low maintenance, good integration, and high reliability of power supply [1,2]. However, influenced by production techniques and prolonged operation, the internal components of GIS inevitably suffer from defects (such as cracks, air bubbles, and metal foreign bodies), which lead to the failure of the insulation performance of the equipment and render its protection and control role in the power grid ineffective [3,4]. In severe cases, it may even cause power outage accidents.…”