Current transformer for GIS and assembling method thereof

Abstract

The invention relates to a current transformer for a GIS and an assembling method thereof. The current transformer for the GIS includes a shielding cylinder, a CT coil sleeved on the shielding cylinder, a connecting flange connected to the shielding cylinder, an intermediate flange arranged at the end of the shielding cylinder, and a tensioning flange connecting the intermediate flange and the connecting flange; the connecting flange and the tensioning flange are connected by threaded fasteners; the tensioning flange is provided with an intermediate flange pressing surface which is press-fitted with the intermediate flange in the axial direction of the shielding cylinder; one of the intermediate flange and the tensioning flange is provided with a positioning member, and the other is provided with a positioning hole for the positioning member to be inserted so that the tensioning flange and the intermediate flange are positioned and matched along the circumferential direction of the shielding cylinder; and the intermediate flange and the tensioning flange are matched with each other in a positioning manner through the positioning member and the positioning hole so that the positionof the connecting flange holes on the connecting flange are matched with the shielding cylinder. The current transformer for the GIS solves the problems of complicated assembling procedures and low assembling efficiency of the assembly between the current transformer for the GIS and electrical equipment in the prior art.

Description

technical field [0001] The invention relates to a current transformer for GIS and an assembly method thereof. Background technique [0002] In the GIS power grid equipment, the detection and measurement of the bus current and the signal source of the secondary control and protection are all induced by the CT coil. The commonly used assembly types of CT coils are divided into fabricated and casted. Assembled CT coils have been gradually replaced by casted CT coils due to their shortcomings such as large inner diameter, difficult assembly, and high cost. The cost of the CT coil is greatly affected by the inner diameter, so the outer diameter of the flange at one end of the shielding tube needs to be as small as possible to meet the economical requirements of the small inner diameter of the CT coil. [0003] The authorized announcement number is CN203746650U, and the Chinese patent whose authorized announcement date is 2014.07.30 discloses a compact current transformer for GIS...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a current transformer for GIS, to solve the problem that in the prior art, when the current transformer for GIS is connected to the electrical equipment, the connecting flange and the cylinder flange will rotate relative to the shielding cylinder circumferential direction, resulting in The assembling procedure is complicated between the current transformer for GIS and the electrical equipment, and the problem of low assembly efficiency; the purpose of the present invention is also to provide a kind of assembling method for the current transformer for GIS that solves the above problems

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