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Cable cross-core all-shield electronic current transducer

An electronic current and core-through technology, which is applied in the directions of inductors, voltage/current isolation, transformer/inductor coil/winding/connection, etc., can solve the problem that the current transformer for protection cannot measure the current transformer for measurement, and the current transformer for measurement Transformers can not use current transformers, use and other problems, to achieve the effect of reducing the average magnetic path length, reducing errors, and reducing the secondary load impedance

Inactive Publication Date: 2015-08-12
林纪秋 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After more than 100 years of development, so far there is no current transformer that can provide a signal with one of its secondary windings or both ends of an air-core coil and provide substantial applications for current measurement and current protection control. In other words, the current transformer for measurement cannot be used as a current transformer for protection, and the current transformer for protection cannot be used as a current transformer for measurement. Neither of them has the function of simultaneous measurement and protection

Method used

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  • Cable cross-core all-shield electronic current transducer
  • Cable cross-core all-shield electronic current transducer
  • Cable cross-core all-shield electronic current transducer

Examples

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Embodiment 1

[0043] The present invention includes a single-core cross-linked cable 1 as a single-turn primary winding, a shielding box 2 formed of a non-magnetic metal material, and a secondary winding 25 arranged inside the shielding box 2. The non-magnetic metal material refers to a non-magnetic Stainless steel, copper, aluminum and other metal plates, wire mesh, or the non-magnetic metal material is sprayed or plated with a non-magnetic metal layer on the plastic material, or the non-magnetic metal material is a combination of non-magnetic metal wire mesh and The material formed by the fusion of plastic materials, as well as semiconductor paint, semiconductor paper, semiconductor rubber and other materials; the secondary winding 25 is wound on the circular winding frame 26, the shielding box 2 is grounded, and the shielding box 2 corresponds to the secondary The central hole of the winding 25 is provided with a metal through-hole formed by a non-magnetic metal tube 22. The single-core c...

Embodiment 2

[0070] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the annular winding bobbin 26 is a non-magnetic annular winding bobbin, and its size is the same as that of the annular iron core in Embodiment 1. The geometric dimensions of the enameled wire are the same, and the number of enameled wire winding turns of the secondary winding 25 is roughly the quotient obtained by dividing the inner circumference length of the circular winding frame by the wire diameter of the enameled wire 0.60mm. In this example, the number of turns is about 230- 250 turns, the two ends of the secondary winding 25 are respectively grounded through a grounding resistor 23, and the resistance value of each grounding resistor 23 is equal, preferably, each resistance value of the grounding resistor 23 in this embodiment is 100Ω. In the air-core coil, the secondary winding is on the non-magnetic circular ring frame. There is no ferromagnetic material to make this sensor have good...

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Abstract

The invention discloses a cable cross-core all-shield electronic current transducer. The transducer can use two ends of one secondary winding individually to provide a sampling signal and input the sampling signal into a signal processing circuit on an electronic circuit board; after processing, two output ends of the circuit simultaneously output two sine shaped analog signals, one signal is a measurement signal for current measurement and metering, and the other is a guard signal for current protection control. The cable cross-core all-shield electronic current transducer has both the measurement function and protection function, thereby realizing integration of a measurement current transducer and a protection current transducer, and having excellent performances, low cost, broad applicability, and remarkable economic and technical effects.

Description

technical field [0001] The invention relates to an AC current transformer used in the electric power industry, in particular to a cable-piercing type fully shielded electronic current transformer. Background technique [0002] A current transformer is one of the most basic devices in a power system. [0003] After more than 100 years of development, so far there is no current transformer that can provide a signal with one of its secondary windings or both ends of an air-core coil and provide substantial applications for current measurement and current protection control. In other words, the current transformer for measurement cannot be used as a current transformer for protection, and the current transformer for protection cannot be used as a current transformer for measurement. Neither of them has the function of simultaneous measurement and protection. Contents of the invention [0004] The purpose of the present invention is to overcome the deficiencies of the prior ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/28H01F27/30H01F27/36H01F27/40H01F38/32G01R15/18
Inventor 林纪秋林琳
Owner 林纪秋
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