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Zero-sequence current transformer for electric power circuit

A zero-sequence current and power line technology, which is applied in the direction of inductors, transformer/inductance components, circuits, etc., can solve the problems of the application and promotion of zero-sequence current transformers, and achieve good anti-loosening, labor-saving operation, and easy installation Effect

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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  • Zero-sequence current transformer for electric power circuit
  • Zero-sequence current transformer for electric power circuit
  • Zero-sequence current transformer for electric power circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0020] This embodiment is a zero-sequence current transformer for power lines, see Figure 1 to Figure 7 As shown, it includes a core tube 2 , two pressing bolts 1 , two sets of crimping assemblies 3 , a current transformer 7 and two sets of pressing claw assemblies 9 .

[0021] In this embodiment, the core tube 2, the crimping assembly 3 and the two sets of pressing claw assemblies 9 are all made of insulating materials.

[0022] Two groups of guide holes are arranged on the tube wall of the core tube, and the two groups of guide holes are arranged side by side along the axial direction of the core tube; each group of guide holes includes four radial guide slide holes 22, and the four radial guide slide holes The circumferential direction of the tube is evenly distributed on the tube wall of the core tube; each radial guiding slide hole runs through the tube wall of the core tube along the radial direction of the core tube; the cross-sectional shape of each radial guiding sli...

Embodiment 2）

[0041] This embodiment is basically the same as Embodiment 1, the difference is: see Figure 7 to Figure 8 As shown, in this embodiment, the ring-shaped inductive sensing body is sleeved and fixed on the outer peripheral wall of the pressure plate; the outer wall of the core tube, the outer wall of the crimping piece and the inner wall of the ring-shaped sensing body are clamped to form a plurality of accommodating cavities 73, intelligently controlled The module is arranged in the accommodation cavity. This structure can make full use of the space and is conducive to the overall small size and integration.

Embodiment 3）

[0043] This embodiment is basically the same as Embodiment 1, the difference is: see Figure 9 to Figure 11 As shown, at least one crimping member 31 is provided with a mounting screw hole 315 penetrating through the wall of the pressing plate portion 311 in the radial direction of the core tube; a temperature sensing device 8 is fixedly installed in the mounting screw hole.

[0044] The temperature sensing device 8 includes a metal housing 81 made of metal material with a containing groove 811, a temperature sensor 82 arranged in the containing groove, and a spring 83 for crimping the temperature sensor on the bottom wall of the containing groove , The screw tube plug 84 that is used for limit spring.

[0045] One end 812 of the metal shell close to the central axis of the core 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 core tube is provided with an inner hexagonal screw groove 815;...

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PUM

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Abstract

The invention discloses a zero-sequence current transformer for an electric power circuit. The zero-sequence current transformer comprises a core tube, a current transformer body, two pressing bolts, two sets of crimping components and two sets of press claw components, wherein two groups of guide holes are arranged in the tube wall of the core tube; each group of guide holes comprise at least three radial guide slide holes; two inner thread regions are arranged in a tube cavity of the core tube; each set of crimping component comprises at least three crimping parts; each crimping part is provided with a press plate part and an anti-drop connection part; the crimping parts are detachably arranged on the core tube through the anti-drop connection parts; each press claw comprises a top plate part, a guide slide block part and a drive surface; the crimping components and the press claw components form at least three wire clamping holes in all; the current transformer body comprises an annular induction body; the wire clamping holes are located in a hole cavity of the annular induction body; and an installation screw hole of a built-in temperature sensing device is arranged in at least one crimping part. The zero-sequence current transformer is convenient to install and position and has relatively good firmness.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a zero-sequence current transformer used for power 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 ...

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