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Improved middle-high voltage zero-sequence current transformer

A technology of zero-sequence current and medium-high voltage, 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 improving the intelligence of the power grid, good anti-loosening effect, and labor-saving operation

Inactive Publication Date: 2016-11-09
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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  • Improved middle-high voltage zero-sequence current transformer
  • Improved middle-high voltage zero-sequence current transformer
  • Improved middle-high voltage zero-sequence current transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0020] This embodiment is an improved medium and high voltage zero-sequence current transformer, see Figure 1 to Figure 6 As shown, it includes a base tube 1 , a core tube 2 , a current transformer 7 , two crimping parts 3 and two sets of crimping jaw assemblies 9 .

[0021] In this embodiment, the base pipe, the core pipe 2, the two crimping parts 3 and the two sets of pressing jaw assemblies 9 are all made of insulating materials.

[0022] The inner peripheral wall of the base pipe is provided with four 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 pipe. The inner peripheral wall of the base pipe is also provided with a plurality of positioning sliding grooves 12 along the axial direction of the base pipe.

[0023] The core tube and the base tube are concentrically arranged, and the core tube is located in the lumen of the base tube; the o...

Embodiment 2）

[0037] This embodiment is basically the same as Embodiment 1, the difference is: see Figure 7 and Figure 8 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;

[0038] 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;

[0039] 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 hole...

Embodiment 3）

[0048] This embodiment is basically the same as Embodiment 1, the difference is: see Figure 9 to Figure 10 As shown, in this embodiment, the ring-shaped 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 (the position shown by the dotted line) that penetrates the tube wall in the radial direction; The wall, the outer wall of the core tube, the wire clamping boss, the supporting convex plate, and the pressure jaw pressing plate are clamped to form a plurality of accommodation cavities 73, and the intelligent control module is arranged in the accommodation cavity; between the ring-shaped induction body and the intelligent control module The electrical connection wires pass through the wiring holes. This structure can make full use of the space and is conducive to the overall small size and integration.

[0049] In addition, the base pipe 1 is provided with a m...

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PUM

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Abstract

The invention discloses an improved middle-high voltage zero-sequence current transformer, which comprises a base tube, a core tube, two crimping parts and two sets of press claw components, wherein a plurality of wire clamping bosses are arranged on the inner circumference wall of the base tube; the tube wall of the core tube is provided with two groups of guide holes; each group of guide holes comprise a plurality of radial limiting slide holes; two inner thread regions are arranged on the inner wall of the core tube; each sets of press claw components comprise a plurality of press claws; each press claw comprises a press plate part, a guide slide block part and a drive surface; each crimping part comprises a body, an outer thread region and a crimping boss; each outer thread region is arranged on the outer circumference wall of the body; each crimping boss is arranged at the inner side end of the columnar body; the outer thread regions of the crimping parts are matched with the inner thread regions of the core tube; the drive surface of each press claw is matched with the outer circumference wall of the corresponding crimping boss; an installation screw hole of a built-in temperature sensing device is arranged in the base tube; and each crimping part pushes the press plate parts in one corresponding set of press claw components to move outwards along the radial direction of the core tube when rotating along the preset direction. The improved middle-high voltage zero-sequence current transformer has relatively good performance; and intelligentization of a power grid is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to an improved medium and high voltage zero-sequence current transformer. 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 mechani...

Claims

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Application Information

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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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