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Intelligent zero sequence current transformer with high line clamping intensity

A zero-sequence current and intelligent technology, applied in the field of electric power, can solve the problems such as the limitation of the application and promotion of zero-sequence current transformers, and achieve the effects of reasonable center of gravity distribution, labor-saving operation and vibration reduction

Inactive Publication Date: 2016-10-12
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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  • Intelligent zero sequence current transformer with high line clamping intensity
  • Intelligent zero sequence current transformer with high line clamping intensity
  • Intelligent zero sequence current transformer with high line clamping intensity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0023] This embodiment is an intelligent zero-sequence current transformer with high clamping strength, see Figure 1 to Figure 8 As shown, it includes a base pipe 1 , a core pipe 2 , a crimping piece 3 , a current transformer 7 and a set of pressing claw assemblies 9 .

[0024] In this embodiment, the base pipe 1, the core pipe 2, the crimping member 3 and a set of pressing jaw assemblies 9 are all made of insulating materials.

[0025] The inner peripheral wall of the base pipe is provided with a plurality of clamping bosses 11, and the inner wall of each clamping boss is provided with arc-shaped grooves 111, and each wire-holding boss and arc-shaped grooves extend axially along the base tube. The inner peripheral wall of the base pipe is also provided with four positioning slide grooves 12 along the axial direction of the base pipe.

[0026] The core tube and the base tube are concentrically arranged, and the core tube is located in the lumen of the base tube; the outer pe...

Embodiment 2）

[0042] This embodiment is basically the same as Embodiment 1, the difference is: see Figure 9 and Figure 10 As shown, the base pipe 1 is provided with a mounting screw hole 18 that penetrates the wall of the clamping boss 11 along the radial direction of the base pipe; a temperature sensing device 8 is fixed in the mounting screw hole;

[0043] 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;

[0044] 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 screw hol...

Embodiment 3）

[0053] This embodiment is basically the same as Embodiment 1, the difference is: see Figure 11 to Figure 12 As shown, in this embodiment, the annular inductive induction body is sleeved and fixed on the outer peripheral wall of the base tube; the outer peripheral wall of the base tube is provided with a wiring hole 13 that penetrates the tube wall in the radial direction; the inner wall of the base tube, the outer wall of the core tube, A plurality of accommodating cavities 73 are formed by clipping between the clamping bosses, supporting convex plates, and pressing jaws, and the intelligent control modules are arranged in the accommodating cavities; the electrical connection wires between the ring sensing body and the intelligent control modules pass through the wiring holes. This structure can make full use of the space and is conducive to the overall small size and integration.

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Abstract

The invention discloses an intelligent zero sequence current transformer with high line clamping intensity. The current transformer comprises a base tube, a core tube, a pressing joint part, a current transformer body and a pressing claw assembly, wherein at least three line clamping bosses are disposed on the inner circumferential wall of the base tube; the core tube is located in the cavity of the base tube; a radial limiting slide hole is formed in the tube wall of the core tube; an inner thread area is disposed on the inner wall of the core tube; the pressing claw assembly comprises multiple pressing claws; each pressing claw comprises a pressing plate part, a guide slide block part and a drive face; the pressing joint part comprises a body, an outer thread area and a pressing joint boss, and the outer thread area of the pressing joint part is fitted with the inner thread area of the core tube; the drive face of each pressing claw is fitted with the outer circumferential wall of the pressing joint boss; the current transformer body comprises an annular induction body; each line clamping hole is located in a hole cavity of the annular induction body; and an installation screw hole equipped with a built-in temperature sensing device is formed in the base tube. The current transformer disclosed by the invention has a function of real-time temperature monitoring.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to an intelligent zero-sequence current transformer with high clamping strength. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/06H01F38/30H01F27/40H02G7/04F16L3/10G01K7/22
CPCH01F27/06F16L3/10G01K7/22H01F27/402H01F38/30H01F2027/406H02G7/04
Inventor 不公告发明人
Owner 胡小青
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