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Three-phase electric zero sequence current transformer for preventing cable from loosening

A technology of three-phase electric power and zero-sequence current, 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 good anti-loosening, easy installation, and labor-saving operation

Inactive Publication Date: 2016-10-05
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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  • Three-phase electric zero sequence current transformer for preventing cable from loosening
  • Three-phase electric zero sequence current transformer for preventing cable from loosening
  • Three-phase electric zero sequence current transformer for preventing cable from loosening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0020] This embodiment is a three-phase power zero-sequence current transformer that prevents cables from loosening, see Figure 1 to Figure 8 As shown, it includes a pressing bolt 1 , a core tube 2 , a set of crimping assembly 3 , a current transformer 7 and a set of pressing jaw assembly 9 .

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

[0022] The tube wall of the core tube is provided with a group of guide holes, and the group of guide holes includes four radial guide slide holes 22, and the four radial guide slide holes are evenly distributed on the core tube wall along the circumference of the core tube; The guiding sliding holes all penetrate the core tube wall along the radial direction of the core tube; each radial guiding sliding hole is located in the middle of the core tube in the axial direction, and the cross-sectional shape of each radial guiding sliding hole is I-sha...

Embodiment 2）

[0041] 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 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 11 to Figure 12 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 three-phase electric zero sequence current transformer for preventing a cable from loosening. The three-phase electric zero sequence current transformer comprises a jacking bolt, a core tube, a current transformer, a crimping component and a claw pressing component, wherein a radial-guiding slide hole is formed on a tube wall of the core tube; an internal thread area is formed in a tube cavity of the core tube; the crimping component comprises a plurality of crimping parts; each of the crimping parts is provided with a pressing plate part and an anti-loosening connecting part; each of the crimping parts is detachably arranged on the core tube through the anti-loosening connecting part; the claw pressing component comprises a plurality of pressing claws; each of the pressing claws comprises a top plate part, a guiding slide block part and a driving surface; each guiding slide block part is inserted into a corresponding radial guiding slide hole; the jacking bolt comprises a body, an external thread area and a jacking boss; the jacking boss has the shape of a circular cone platform; the external thread area of the jacking bolt is matched with the internal thread area of the core tube; the driving surface of each pressing claw is matched with a peripheral wall of one corresponding jacking boss; a mounting thread hole with a built-in temperature sensor is formed on at least one of the crimping parts. The three-phase electric zero sequence current transformer is firmly, stably and reliably mounted.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a three-phase power zero-sequence current transformer for preventing cable loosening. 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 pro...

Claims

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Application Information

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IPC IPC(8): H01F27/06H01F38/38H01F27/40H02G7/04F16L3/10G01K7/22
CPCH01F27/06F16L3/10G01K7/22H01F27/402H01F38/38H01F2027/406H02G7/04
Inventor 不公告发明人
Owner 胡小青
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