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Three-phase zero sequence current transformer

A sequence current and transformer technology, which is applied in the field of three-phase zero-sequence current transformers, can solve problems such as restrictions on application and promotion, and achieve the effects of ensuring stability and reliability, firm strength, and high firm strength

Inactive Publication Date: 2016-08-10
胡妍
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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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  • Three-phase zero sequence current transformer
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  • Three-phase zero sequence current transformer

Examples

Experimental program
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Effect test

Embodiment 1）

[0021] The present embodiment is a kind of power line connection clip, see Figure 1 to Figure 10 As shown, it includes a core tube 2 , a set of pressing jaw assembly 3 , a flat nut 4 , a current transformer 9 and three crimping parts 1 .

[0022] The tube wall of the core tube is provided with three radial limiting sliding holes 22, and each radial limiting sliding hole runs through the core tube tube wall along the radial direction of the core tube; each radial limiting sliding hole is located on the axial direction of the core tube. In the middle part, the radial cross-sectional shape of each radial limit hole is I-shaped; the inner peripheral wall of the core tube is provided with an inwardly protruding annular stopper 23 .

[0023] Each crimping piece is provided with a pressing plate portion 11 and an anti-off connecting portion 12; the crimping piece is detachably arranged on the core tube through the anti-off connecting portion; the pressing plate portion 11 extends ax...

Embodiment 2）

[0035] This embodiment is basically the same as the above-mentioned embodiment 1, the difference is that: see Figure 11 to Figure 13 As shown, the current transformer 9 in this embodiment includes a ring-shaped sensing body 91 and an intelligent control module 92; the overall shape of the smart control module is also ring-shaped; the ring-shaped sensing body 91 and the smart control module 92 are arranged side by side on the outer periphery of the crimping piece on the wall.

[0036] At least one of the crimping parts 1 is provided with a mounting screw hole 15 penetrating through the pressing plate portion in the radial direction of the core tube; a temperature sensing device 8 is fixed in the mounting screw hole.

[0037] 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 conta...

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Abstract

The invention discloses a three-phase zero sequence current transformer. The three-phase zero sequence current transformer comprises a core tube, a set of press claw assemblies, a planar nut, a current transformer and three crimping elements, wherein each crimping element is provided with a press plate part and a disconnection-preventing connection part and is detachably arranged on the core tube by the disconnection-preventing connection part, the press plate parts are arranged outside the core tube, three radial limitation sliding holes are formed in the tube wall of the core tube, the press claw assemblies comprise three press claws, each press claw comprises a top plate part, a guide sliding block part and a driving thread part, the guide sliding block part is inserted into the corresponding radial limiting sliding hole, the driving thread parts extend into a tube cavity of the core tube, the planar nut is rotatably arranged in the tube cavity of the core tube and comprises a planar thread part, the current transformer comprises an annular substrate, the annular substrate is arranged outside the crimping elements, an installation screw hole is formed in at least one of the crimping elements, and a temperature sensing device is arranged in the installation screw hole. The three-phase zero sequence current transformer has a function of monitoring temperature in real time.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a three-phase 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 receives the zero-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/06H01F38/38H01F27/40H02G7/04F16L3/10G01K7/22
CPCH01F27/06F16L3/10G01K7/22H01F27/402H01F38/38H01F2027/406H02G7/04
Inventor 胡妍
Owner 胡妍
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