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Electronic compensated inductive diverter

A compensation type, shunt technology, applied in the direction of voltage/current isolation, instruments, measuring electrical variables, etc., can solve the problem of the influence of inductive shunt error measurement, the inability to compensate the load characteristics of the inductive shunt, etc., to achieve a small measurement uncertainty , Simple structure, not easy to aging effect

Active Publication Date: 2017-08-11
CHINA ELECTRIC POWER RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an electronically compensated inductive shunt, which solves the problems in the prior art that the additional impedance of the resistance-capacitance line will affect the error measurement of the inductive shunt and cannot compensate the load characteristics of the inductive shunt

Method used

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Embodiment 1

[0026] This embodiment includes an induction shunt unit and an electronic compensation unit; the induction shunt unit includes a main core 1 , an auxiliary iron core 2 , a proportional winding 3 , a compensation winding 4 and a detection winding 5 ; the electronic compensation unit is composed of an operational amplifier 7 . Proportional winding 3 is composed of 10 segments connected in sequence with 20 turns; compensation winding 4 and proportional winding 3 have the same number of turns, both 200 turns; detection winding takes 50 turns. The operational amplifier 7 adopts an analog integrated low-noise operational amplifier OP07, and its amplification factor (gain) is 200.

[0027] See attached figure 1 , the detection winding 5 is evenly wound on the outside of the main core 1, the compensation winding 4 is evenly wound on the outside of the detection winding 5, and the main core 1, the detection winding 5 and the compensation winding 4 are integrally and coaxially nested in...

Embodiment 2

[0047] This embodiment includes an induction shunt unit and an electronic compensation unit; the induction shunt unit includes a main core 1 , an auxiliary iron core 2 , a proportional winding 3 , a compensation winding 4 and a detection winding 5 ; the electronic compensation unit is composed of an operational amplifier 7 . Proportional winding 3 is composed of 5 segments connected in sequence with 50 turns; compensation winding 4 and proportional winding 3 have the same turns, 250 turns; detection winding takes 200 turns. The operational amplifier 7 adopts an analog integrated low-noise operational amplifier OP07, and its amplification factor (gain) is 500.

[0048] See attached figure 2 , the detection winding 5 is evenly wound on the outside of the main core 1, the compensation winding 4 is evenly wound on the outside of the detection winding 5, and the main core 1, the detection winding 5 and the compensation winding 4 are integrally and coaxially nested in the auxiliary...

Embodiment 3

[0061] This embodiment includes an induction shunt unit and an electronic compensation unit; the induction shunt unit includes a main core 1 , an auxiliary iron core 2 , a proportional winding 3 , a compensation winding 4 and a detection winding 5 ; the electronic compensation unit is composed of an operational amplifier 7 . Proportional winding 3 is composed of 10 segments connected in sequence with 20 turns; compensation winding 4 and proportional winding 3 have the same number of turns, both 200 turns; detection winding takes 50 turns. The operational amplifier 7 adopts an analog integrated low-noise operational amplifier OP07, and its amplification factor (gain) is 200.

[0062] See attached image 3 , the detection winding 5 is evenly wound on the outside of the main core 1, the compensation winding 4 is evenly wound on the outside of the detection winding 5, and the main core 1, the detection winding 5 and the compensation winding 4 are integrally and coaxially nested in...

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Abstract

The present invention discloses an electronic compensated inductive diverter that solves the problem that the additional impedance of the resistive line in the prior art affects the error measurement of the inductive diverter and cannot compensate the load characteristics of the inductive diverter. The electronic compensated inductive diverter comprises a main core (1), an auxiliary core (2), a proportional winding (3), a compensated winding (4), a detection winding (5) and an operational amplifier. The detection winding (5) is wound on the outside of the main core (1), the compensated winding (4) is wound on the outside of the detection winding (5), the main core (1), the detection winding (5) and the compensated winding (4) are coaxially embedded in the auxiliary core (2), and the proportional winding (3) is wounded outside the auxiliary core (2); the detection winding (5) is connected with the operational amplifier, and the output end of the operational amplifier is connected with the compensated winding (4). The electronic compensated inductive diverter is suitable for the field of self calibration of current proportional self calibration systems, and is characterized by high measuring range extension efficiency, small uncertainty of measurement and the like.

Description

technical field [0001] The invention relates to a current measuring instrument, in particular to an electronic compensation induction shunt. Background technique [0002] The shunt is an important current meter to realize the power frequency current sampling function. The traditional resistive shunt has a simple structure and high accuracy, but it will generate a lot of Joule heat when used in a high current environment, and make the resistance The resistance value changes. With the development of technology, current transformers based on the principle of transformer electromagnetic induction generally replace the original resistive shunt, also known as inductive shunt. The measurement accuracy level of the existing inductive shunt does not exceed 0.001 without compensation, and the error of the inductive shunt is greatly affected by the secondary load, which cannot meet the application requirements of the current ratio standard (the accuracy is 2×10 -5 The current transfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/18
CPCG01R15/185
Inventor 熊魁周峰范洁刘强郭亮王鑫萌殷小东
Owner CHINA ELECTRIC POWER RES INST