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Zero sequence current transformer

A zero-sequence current and transformer technology, applied in the field of electric power, can solve problems such as application and promotion restrictions, and achieve the effect of ensuring stable reliability, stable and reliable firm strength, and excellent anti-loosening effect.

Inactive Publication Date: 2016-08-10
申俊
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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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  • Zero sequence current transformer
  • Zero sequence current transformer
  • Zero sequence current transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0018] This embodiment is a zero-sequence current transformer, see Figure 1 to Figure 7 As shown, it includes a core tube 2 , two sets of pressing jaw assemblies 3 , two flat nuts 4 , two sets of crimping assemblies and a current transformer 9 .

[0019] The tube wall of the core tube is provided with six 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 in the axial direction of the core tube. In the middle part of the top, the radial cross-sectional shape of each radial limiting hole is I-shaped; the inner peripheral wall of the core tube is provided with an annular stopper 23 protruding inward. In this embodiment, the six radial limiting holes are divided into two groups, and the three radial limiting holes in each group are used for matching with a corresponding set of pressing jaw assemblies.

[0020] Each set of crimping c...

Embodiment 2）

[0032] This embodiment is basically the same as the above-mentioned embodiment 1, the difference is that: see Figure 8 to Figure 10 As shown, in this embodiment, the overall shape of the intelligent control module is also ring-shaped; the ring-shaped sensing body 91 and the intelligent control module 92 are sleeved side by side on the outer peripheral wall of the crimping member.

[0033] 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.

[0034] 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 pipe plug 84 that is used for limit spring.

[0035] One end 812 of the...

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PUM

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Abstract

The invention discloses a zero sequence current transformer. The zero sequence current transformer comprises a core tube, a current transformer, two sets of press claw assemblies, two planar nuts and six crimping elements, wherein six radial limitation sliding holes are formed in the tube wall of the core tube, 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, each set of press claw assembly comprises 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, each 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, 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 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 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-sequence curr...

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 申俊
Owner 申俊