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High-voltage electric 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: 2017-01-04
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 electric power zero-sequence current transformer for power transmission and distribution line
  • High-voltage electric power zero-sequence current transformer for power transmission and distribution line
  • High-voltage electric 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, the base tube 1, the core column 2, the bolt 3, the current transformer 7 and the splint assembly 4 are included; the base tube 1, the core column 2 and the splint assembly 4 are all made of insulating materials.

[0022] The base pipe 1 includes a pressure pipe portion 11 and a sealing plate portion 12 located at one end of the pressure pipe portion; the shape of the pressure pipe portion is circular, and the inner wall of the pressure pipe portion is provided with a crimping boss 13 on the inner wall of the crimping boss With an arc-shaped slot 14. The base pipe is made in one piece, the crimping boss is formed to protrude radially inward from the inner wall of the pressure pipe part, and the crimping boss penetrates the inner wall of the pressure pipe part in the axial direction of the pressure pipe part.

[0023] In this ...

Embodiment 2

[0044] This embodiment is basically the same as the above-mentioned embodiment 2, the difference lies in: see Picture 10 with Picture 11 As shown, the base pipe 1 is provided with a mounting screw hole 18 that penetrates the wall of the pressure pipe 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 shell 81 made of a metal material and having a containing groove 811, a temperature sensor 82 arranged in the containing groove, a spring 83 for pressing the temperature sensor on the bottom wall of the containing groove, Solenoid plug 84 for limit spring;

[0046] The end 812 of the metal shell close to the central axis of the base tube is provided with a heat conduction boss 813 used for puncture, and the end 814 of the metal shell far away from the central axis of the base tube is provided with an inner hexagonal screwing groove 815; There is an externa...

Embodiment 3

[0055] This embodiment is basically the same as embodiment 1, the difference lies in: see Picture 12 As shown, the bolt in this embodiment no longer includes a nut 34. In this embodiment, an internal threaded area 171 is provided in the limit sliding hole of the sealing plate portion for fitting with the external threaded connection part of the bolt; Passing through the central hole of the core column, the external threaded connection part of the bolt is screwed to the internal threaded area.

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

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Abstract

The invention discloses a high-voltage electric power zero-sequence current transformer for a power transmission and distribution line. The high-voltage electric power zero-sequence current transformer comprises a base tube, a core column, a bolt, a current transformer body and a plate-clamping assembly, wherein the base tube comprises a tube-pressing part and a plate-sealing part which are fixedly and oppositely arranged; a limiting sliding hole and threading holes are formed in the plate-sealing part; crimping lug bosses are arranged on the inner wall of the tube-pressing part; a conical crimping surface is arranged on the outer circumference wall of the core column; the plate-clamping assembly comprises wire-clamping plates; a guiding sliding table is arranged on the inner wall of each wire-clamping plate; guiding sliding grooves are formed in each wire-clamping plate; limiting sliding columns adapted to the guiding sliding grooves are arranged on each crimping lug boss; each wire-clamping plate is arranged in a manner of directly facing to one corresponding crimping lug boss; the current transformer body comprises an annular induction body; each wire-clamping hole is formed in the corresponding hole cavity of the annular induction body; the bolt is rotated to push each wire-clamping plate to move radially along the tube-pressing part; and a mounting screw hole which penetrates through the wall part of the tube-pressing part in a radial direction is formed in the base tube; and a temperature sensing apparatus is fixedly arranged in the mounting screw hole. The high-voltage electric power zero-sequence current transformer has a real-time temperature monitoring function.

Description

Technical field [0001] The invention belongs to the field of electric power technology, and specifically relates to a high-voltage power zero-sequence current transformer used for 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 circuit and electrical equipment are normal, the vector sum of each phase current is equal to zero. Therefore, the secondary 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 each phase current is not zero. The fault current causes magnetic flux to be generated 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 ...

Claims

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Application Information

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