Zero sequence current transformer for overhead line

A technology of zero-sequence current and overhead lines, which is applied in the field of electric power, can solve problems such as restrictions on the application and promotion of zero-sequence current transformers, and achieve the effects of compact and reasonable structure, easy installation, and labor-saving operation

Inactive Publication Date: 2017-05-24
胡小青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing zero-sequence current transformers are installed by means of flange installation or bonding. The installation position generally needs to be reserved, so the application and promotion of zero-sequence current transformers are more restricted.

Method used

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  • Zero sequence current transformer for overhead line
  • Zero sequence current transformer for overhead line
  • Zero sequence current transformer for overhead line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0019] This embodiment is a zero-sequence current transformer for overhead lines, see Figure 1 to Figure 9 As shown, it includes a base pipe 1, a stem 2, a bolt 3, a current transformer 7 and a splint assembly 4; the base pipe 1, the stem 2 and the splint assembly 4 are all made of insulating materials.

[0020] The base pipe 1 includes a crimping part 11 and a sealing part 12 located at one end of the crimping part; the shape of the crimping part is circular, and the inner wall of the crimping part is provided with a crimping boss 13, and the inner wall of the crimping boss is An arc groove 14 is provided. The base tube is made in one piece, and the crimping boss protrudes radially inward from the inner wall of the crimping tube part, and the crimping boss penetrates the inner wall of the crimping tube part along the axial direction of the crimping tube part.

[0021] In this embodiment, four crimping bosses are arranged on the crimping tube part, and the four crimping boss...

Embodiment 2）

[0041] This embodiment is basically the same as Embodiment 1, the difference is: see Figure 10 to Figure 12 As shown, the base pipe 1 is provided with a mounting screw hole 18 that penetrates the wall of the pressure tube portion 11 along the radial direction of the base pipe; a temperature sensing device 8 is fixed in the mounting screw hole;

[0042] The temperature sensing device includes a metal housing 81 made of metal material with a containing groove 811, a temperature sensor 82 arranged in the containing groove, a spring 83 for crimping the temperature sensor on the bottom wall of the containing groove, Coil plug 84 for limit spring;

[0043] One end 812 of the metal shell close to the central axis of the base tube is provided with a heat conduction boss 813 used as a puncture, and one end 814 of the metal shell away from the central axis of the base tube is provided with an inner hexagonal screw groove 815; There is an external thread 816 adapted to the mounting scr...

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PUM

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Abstract

The invention discloses a zero sequence current transformer for an overhead line. The zero sequence current transformer comprises a base tube, a core column, a bolt, a current transformer body and a clamping plate assembly. The base tube comprises a tube pressing part and a blanking plate part. The blanking plate part and the tube pressing part are oppositely and fixedly arranged. The blanking plate part is provided with a limiting sliding hole and a threading hole. The core column is in a frustum shape, and the core column is provided with a tip layering sliding groove and a conical pressure welding surface. A center screw hole is formed in the center of the core column in the axial direction of the tube pressing part. The clamping plate assembly comprises at least three line clamping plates. The line clamping plates are right opposite to corresponding pressure welding bosses. The bolt comprises a rod body, a fastening part and an external thread connecting part. The rod body of the bolt penetrates through the limiting sliding hole to be located in the center screw hole of the core column. The current transformer body comprises an annular induction body. Line clamping holes are located in a hole cavity of the annular induction body. The bolt is rotated to pull the core column to push and press the line clamping plates to move outwards in the radial direction of the tube pressing part. The base tube is provided with an installing screw hole. A temperature sensing device is fixedly arranged in the installing screw hole. The structure is compact, and the performance is good.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a zero-sequence current transformer for overhead lines. Background technique [0002] The basic principle of zero-sequence current protection is based on Kirchhoff's current law: the algebraic sum of the complex current flowing into any node in the circuit is equal to zero. When the line and electrical equipment are normal, the vector sum of the currents of each phase is equal to zero. Therefore, the secondary side winding of the zero-sequence current transformer has no signal output, and the actuator does not operate. When an electric shock or leakage fault occurs, the vector sum of the currents of each phase is not zero, and the fault current causes magnetic flux in the iron core of the zero-sequence current transformer, and the current generated by the zero-sequence current transformer is the zero-sequence current. When the protection mechanism receives the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/30H01F27/06H01F27/40
CPCH01F38/30H01F27/06H01F27/40H01F27/402H01F2027/406H01F2038/305
Inventor 不公告发明人
Owner 胡小青
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