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High-voltage power zero sequence current transformer for power transmission and distribution line

A technology of transmission and distribution lines and high-voltage power, 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 compact and reasonable structure, good anti-loosening effect, and labor-saving operation

Inactive Publication Date: 2016-11-30
钱才英
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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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  • High-voltage power zero sequence current transformer for power transmission and distribution line
  • High-voltage power zero sequence current transformer for power transmission and distribution line
  • High-voltage power zero sequence current transformer for power transmission and distribution line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment is a high-voltage power zero-sequence current transformer for transmission and distribution lines, see Figure 1 to Figure 9 As shown, it includes a base pipe 1, a stem 2, a bolt 3, a current transformer 7 and a splint assembly 4; the base pipe 1, the stem 2 and the splint assembly 4 are all made of insulating materials.

[0022] The base pipe 1 includes a crimping part 11 and a sealing part 12 located at one end of the crimping part; the shape of the crimping part is circular, and the inner wall of the crimping part is provided with a crimping boss 13, and the inner wall of the crimping boss is An arc groove 14 is provided. The base tube is made in one piece, and the crimping boss protrudes radially inward from the inner wall of the crimping tube part, and the crimping boss penetrates the inner wall of the crimping tube part along the axial direction of the crimping tube part.

[0023] In this embodiment, four crimping bosses are arranged on the crimpi...

Embodiment 2

[0044] This embodiment is basically the same as the above-mentioned embodiment 1, the difference is that: see Figure 10 and Figure 11 As shown, the base pipe 1 is provided with a mounting screw hole 18 that penetrates the wall of the pressure tube portion 11 along the radial direction of the base pipe; a temperature sensing device 8 is fixed in the mounting screw hole;

[0045] 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;

[0046] 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...

Embodiment 3

[0055] This embodiment is basically the same as Embodiment 2, the difference is: see Figure 12 As shown, the bolt in this embodiment no longer includes a nut 34. In this embodiment, an internal thread area 171 for fitting with the external threaded connection part of the bolt is set in the limit sliding hole of the sealing plate part; Through the central hole of the core column, the external thread connection part of the bolt is screwed with the internal thread area.

[0056] In this embodiment, a nut is saved, and the structure is relatively simplified.

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PUM

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Abstract

The invention discloses a high-voltage power zero sequence current transformer for a power transmission and distribution line. The high-voltage power zero sequence current transformer comprises a base tube, a core column, a bolt, a current transformer and a clamping plate assembly, wherein the base tube comprises a press tube part and a sealing plate part, the sealing plate part and the press tube part are oppositely and fixedly arranged, the sealing plate part is provided with a limitation sliding hole and threading holes, crimping bosses are arranged on an inner wall of the press tube part, a conical crimping surface is arranged on a peripheral wall of the core column, the clamping plate assembly comprises wire clamping plates, a guide sliding table is arranged on an inner wall of each wire clamping plate, a guide sliding groove is formed in each wire clamping plate, a limitation sliding post is arranged on each crimping boss and is adaptive to the guide sliding groove, each wire clamping plate is arranged right opposite to one corresponding crimping boss, the current transformer comprises an annular sensitive body, each wire clamping hole is formed in a hole cavity of the annular sensitive body, each wire clamping plate is pushed to move along a radial direction of the press tube part by rotating the bolt, the base tube is provided with an installation screw hole, the installation screw hole passes through a wall body of the press tube part along the radial direction of the base tube, and a temperature sensitive device is fixedly arranged in the installation screw hole. The high-voltage power zero sequence current transformer has the function of real-time temperature monitoring.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/06H01F38/38H01F27/40G08C17/02
CPCH01F27/06G08C17/02H01F27/40H01F38/38
Inventor 钱才英
Owner 钱才英
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