Transformer Oil Dielectric Strength in the Contact Gap of the Explosive Arc-Extinguishing Device

5th International Conference: Modern Technologies For Non-Destructive Testing

材料科学;物理学

Muravlev, I.O.^1 ; Surkov, M.A.^1 ; Tarasov, E.V.^1 ; Tsoggerel, Kh^1 ; Uvarov, N.F.^2,3

National Research Tomsk Polytechnic University, Tomsk, Russia^1

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, RAS, Novosibirsk, Russia^2

Novosibirsk State Technical University, Novosibirsk, Russia^3

关键词: Contact gaps;    Dielectric strengths;    Extinguishing device;    Gas inclusions;    High speed flows;    Power circuit;    Static state;    Switch contacts;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/189/1/012018/pdf
DOI  :  10.1088/1757-899X/189/1/012018

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The article describes the experimental results on the breakdown of the high-speed flow of transformer oil. In real conditions, the flow moves in the contact gap of a high-voltage explosive switch with speeds from 67 to 152 m / s. The geometry of the contact gap is sharply inhomogeneous and forms turbulence in the flow zone. In the arc chute medium the air inclusions pass from the dissolved state to the gaseous and the emerging bubbles enter to the electric field. Breakdown occurs, mainly through gas inclusions. In the moment, the gradient of the breakdown voltage is reduced by 91.6% compared to the static state of the oil. The experiments were carried out on the model of a high-voltage explosive switch, connected to the power circuit of the surge generator. The probing of the gap was made by a standard pulse of 1.5 / 50 μs. As a result, the dependences of the gradient of the breakdown voltage on the flow rate of the transformer oil for the usual geometry of the high-voltage explosive switch contact system are constructed.