Improved three-phase power zero-sequence current transformer

A three-phase power, zero-sequence current technology, applied in the field of electric power, can solve problems such as application and promotion restrictions, and achieve the effects of ensuring stable reliability, high firm strength, and easy installation

Inactive Publication Date: 2016-08-17
申清章
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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 location generally needs to be reserved, so its application and promotion are more restricted.

Method used

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  • Improved three-phase power zero-sequence current transformer
  • Improved three-phase power zero-sequence current transformer
  • Improved three-phase power zero-sequence current transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0017] This embodiment is an improved three-phase power zero-sequence current transformer, see Figure 1 to Figure 6 As shown, it includes a base pipe 1 , a core pipe 2 , two sets of pressing jaw assemblies 3 , two flat nuts 4 and a current transformer 9 .

[0018] The inner peripheral wall of the base pipe is provided with three crimping bosses 11 along the axial direction of the base pipe, and the inner wall of each crimping boss is provided with an arc-shaped groove 111; the inner peripheral wall of the base pipe is also provided with four positioning slides along the axial direction of the substrate Slot 12; the core tube and the base tube are concentrically arranged and located in the base tube lumen; the outer peripheral wall of the core tube is provided with four supporting convex plates 21 protruding radially along the core tube, and the outer ends of each supporting convex plate are located at corresponding to a positioning chute, so that the core tube is supported an...

Embodiment 2）

[0029] The base pipe 1 is provided with a mounting screw hole 15 radially penetrating through the wall of the base pipe; a temperature sensing device 8 is fixed in the mounting screw hole.

[0030] 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.

[0031] 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; There is an external thread 816 adapted to the mounting screw hole, and an internal thread area 817 is provided on the inner peripheral wall of the accommodating groove; the heat conduct...

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PUM

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Abstract

The invention discloses an improved three-phase power zero-sequence current transformer. The improved three-phase power zero-sequence current transformer comprises a base tube, a core tube, two pressing claw assemblies, two planar nuts and a current transformer body, wherein the base tube is sleeved with the current transformer body and provided with crimping bosses; radial limiting sliding holes are formed in the wall of the core tube, and a stop block is arranged on the inner circumferential wall of the core tube; the two planar nuts are rotationally arranged in a cavity of the core tube and located on two sides of the stop block; a driving thread part of each pressing claw assembly is located on one side, far away from the stop block, of the corresponding planar nut; each planar nut comprises a fastening part and a planar thread part meshed and matched with the driving thread part of each pressing claw of the corresponding pressing claw assembly; a mounting screw hole in which a temperature sensing device is arranged is formed in the base tube. The improved three-phase power zero-sequence current transformer has an excellent loosening prevention effect.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to an improved three-phase electric 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 ...

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 申清章
Owner 申清章
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