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Improved type zero-sequence current transformer

A zero-sequence current and transformer technology, which is applied in the electric power field, 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, saving labor in operation, and preventing loosening

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 type zero-sequence current transformer
  • Improved type zero-sequence current transformer
  • Improved type zero-sequence current transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0021] This embodiment is an improved 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 .

[0022] 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.

[0023] 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.

[0024] 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 peripheral wall of ...

Embodiment 2）

[0038] 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;

[0039] 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;

[0040] 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）

[0049] 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.

[0050] In addition, the base pipe 1 is provided with a m...

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Abstract

The invention discloses an improved type zero-sequence current transformer. The improved type zero-sequence current transformer comprises a base tube, a core tube, two crimping parts and two sets of pressing claw assemblies, wherein multiple wire-clamping lug bosses are arranged on the inner circumferential wall of the base tube; two groups of guiding holes are formed in the tube wall of the core tube; each group of guiding holes comprise multiple radial limiting sliding holes; two internal thread regions are arranged on the inner wall of the core tube; each set of pressing claw assembly comprises multiple pressing claws; each pressing claw comprises a plate pressing part, a guiding sliding block part and a driving surface; each crimping part comprises a body, an external thread region which is arranged on the outer circumferential wall of the body, and a crimping lug boss which is arranged at the inner side end of the columnar body; the external thread region of each crimping part is matched with the internal thread region of the core tube; the driving surface of each pressing claw is matched with the outer circumferential wall of the corresponding crimping lug boss; a mounting screw hole is formed in the base tube, wherein a temperature sensing apparatus is arranged in the mounting screw hole; and when each crimping part rotates in a preset direction, the plate pressing part of corresponding one set of pressing claw assembly is pushed to move outwardly in the radial direction of the core tube. The improved type zero-sequence current transformer is relatively good in performance and capable of improving the intelligent level of the power grid.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to an improved 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 mechanism receives the zero-seq...

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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