Configuration structure for homo-tower dual-loop compact transmission line insulator equalizing ring

Abstract

The invention discloses an insulator grading-ring allocation structure for same-tower double-circuit compact-type transmission lines. The allocation structure comprises insulator strings symmetrically arranged on two sides of a T-shaped tower. The insulator strings are connected into three V-shaped structures through a plurality of bundle conductor hardware tools, and the three V-shaped structures are divided into an upper phase and a lower phase which are hung in a T-shaped tower window, wherein the upper phase is a W-shaped structure formed by two V-shaped dually-connected strings and is hung on a tower crossarm; the lower phase is a V-shaped dually-connected string of which one side is hung on a tower body, and the other side is hung on the tower crossarm and is connected into a structure with a shape of a down arrow through an intermediate insulator string hung on the middle part of the tower crossarm; and one side of the insulator string in the V-shaped structure and one side of the intermediate insulator string, which are close to a power transmission conductor, are both provided with annular grading rings, are connected to the bundle conductor hardware tools by use of a bracket, and are equipotential with the power transmission conductor. The grading-ring allocation can realize the homogenization of voltage distribution and electric field distribution of the insulator strings, prevents the corona discharge and electrical erosion loss on the high-voltage sides of the insulator strings, and improves the operation reliability of same-tower double-circuit compact-type lines.

Description

technical field [0001] The invention belongs to the technical field of external insulation of ultra-high voltage AC transmission lines, and in particular relates to a configuration structure of a 750kV same-tower double-circuit compact transmission line insulator voltage equalizing ring. The high voltage side of porcelain, glass and composite insulators and the tower side of composite insulators play the role of evenly distributing voltage and electric field. Background technique [0002] With the growth of the national economy, China's demand for electricity continues to increase. China's natural conditions and the distribution characteristics of energy and load centers make ultra-long-distance, ultra-large-capacity power transmission inevitable. In order to increase transmission capacity and save precious land resources, There is a need for a cost-effective method of ultra-high voltage AC power transmission. [0003] The 750kV double-circuit compact transmission line on t...

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Problems solved by technology

[0004] At present, since the 750kV double-circuit compact transmission line on the same tower is still in the research and construction stage, there is no public report on the configuration structure of its voltage equalizing ring.

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