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Secondary current compensation method for current mutual inductors

A current transformer and secondary current technology, applied in the field of current compensation, can solve problems such as inconvenient debugging, difficult realization, and complex structure

Active Publication Date: 2015-04-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this compensation method also has disadvantages, such as the need to increase electronic circuits, and the structure is complex, inconvenient to debug, difficult to implement, etc.

Method used

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  • Secondary current compensation method for current mutual inductors
  • Secondary current compensation method for current mutual inductors
  • Secondary current compensation method for current mutual inductors

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] refer to figure 1 , which is a flowchart block diagram of specific steps of the secondary current compensation method of the present invention.

[0056] refer to figure 2 , which is the experimental curve of the input and output effective value of the current transformer.

[0057] As shown in the figure, in order to facilitate the signal acquisition and processing of the hardware circuit, the secondary current has been converted into a voltage value through the sampling resistor.

[0058] It can be clearly seen from the figure that when the detection current becomes larger, the secondary current output curve rises flat, and its value is no longer in a linear relationship with the input detection current. With the further increase of the current, the current detection The error will increase to an unacceptable level. In order to solve this problem, the secondary current is corrected by means of software compensation, so as to obtain the measured current which changes l...

Embodiment 2

[0083] by figure 2 Take the input-output characteristic curve of a current transformer as an example. This curve is obtained through a large number of experiments on current transformers of the same specification and batch, and is typical. The current test range is 6A~600A, with a total of 35 test points. By observing the experimental curve and calculating the experimental data, it can be seen that when the input current is between 6A~150A, the actual output curve is very close to the ideal curve, that is, the inspection of the secondary current can truly reflect the magnitude of the primary current, so no correction is required. However, as the primary current continues to increase from 100A, due to the saturation effect of the current transformer, the secondary current cannot increase linearly, resulting in a larger error. At this time, it is necessary to correct the measurement results.

[0084] given control error =5%, the curve obtained by the automatic segment fitti...

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Abstract

The invention relates to a secondary current compensation method for current mutual inductors. The method comprises the steps specifically as follows: making a large amount of experiments on current mutual inductors in the same batch to obtain typical input and output curves of the current mutual inductors; conducting segmentation and fitting on the output curve of the current mutual inductors under a given error; calculating a compensation coefficient of each segment; and writing the compensation coefficients into signal collecting software. By adopting the secondary current compensating method for current mutual inductors, the problem of the current mutual inductors in inaccurate detection under large currents can be well solved, and accurate measurement values can be obtained through compensation even in condition of large currents.

Description

technical field [0001] The invention relates to a current compensation method, in particular to a current transformer secondary current compensation method. Background technique [0002] With the development of production and life in modern society, digitization and intelligence of traditional switching appliances have become an inevitable trend. The current, voltage and other parameters of the power system operation site cannot be directly collected and processed by the central processing module of the digital controller, but must be transformed into corresponding electric quantities through transformers (such as current transformers, voltage transformers, etc.) The signal is sent to the channel to be measured, and after further conditioning, it can be sent to the A / D converter to become a digital quantity that can be accepted and processed by the central processing unit and the control model. With the improvement of processor performance, the electronic circuit has less a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 黄世泽郭其一
Owner TONGJI UNIV