Electronic type transformer checking system

A technology of current transformer and voltage transformer, which is applied in the field of calibration system of electronic transformer, can solve problems such as untraceability and unguaranteed accuracy, and achieve the effects of traceability of measurement results, simple structure and high measurement accuracy.

Inactive Publication Date: 2010-08-18
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Since the acquisition card generally has temperature drift and stability problems, and cannot be traced back to the source, using it to calibrate the electronic transformer cannot guarantee sufficient accuracy

Method used

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  • Electronic type transformer checking system
  • Electronic type transformer checking system
  • Electronic type transformer checking system

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] The electronic current transformer calibration system of the present invention includes a voltage regulator 1, a current booster 2, a standard current transformer 3, a sampling resistor 4, a digital meter 5, an electronic current transformer 6, a merging unit 7, and a clock synchronization circuit 8 , Digital signal output 9 of digital meter, Ethernet 10 and industrial computer 11.

[0021] The current to be measured is provided by the current booster 2, and the current flows through the primary side of the standard current transformer and the electronic current transformer 6 under test at the same time. Adjusting the output voltage of the voltage regulator 1 can change the output current of the current booster 2 . The secondary side of the standard current transformer is connected to a high-precision standard resistor 4, and the voltag...

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Abstract

The invention provides an electronic type transformer checking system, comprising a voltage regulator, a current booster (or a pressure booster), a standard CT (Current Transformer) or a standard PT (Pressure Transformer), a numerical table, an electronic type current transformer (or an electronic type voltage transformer), a merge unit, a synchronous clock circuit and an industrial personal computer. The numerical table acquires a current measurement value of a standard CT or a voltage measurement value of the standard PT), and the merge unit acquires a current measurement value of the electronic type current transformer (or a voltage measurement value of the electronic type voltage transformer). The measurement results acquired by the numerical table and the measurement results acquired by the merge unit are sent to the computer synchronously, and the computer calculates ratio difference and angular difference. The invention has the advantages of high precision, good stability and tracing basis, and can be applied to checking electronic type transformers with high precision.

Description

technical field [0001] The invention relates to an electronic transformer for measuring alternating current and voltage in a power system, in particular to a calibration system for the electronic transformer. Background technique [0002] The two most important indicators of the transformer are the ratio difference and the angle difference. The size of the error is directly related to the accuracy of the measurement and the correctness of the protection. Therefore, it is very important and necessary to perform high-precision calibration on the transformer. The difference method is generally used in the verification of the contrast difference and angle difference of the traditional electromagnetic transformer, which is very mature. With the implementation of digital substations and smart grids, electronic transformers have become new instruments for measuring current and voltage in power systems. Because their working principles are different from traditional electromagnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
Inventor 李开成李振兴易杨
Owner HUAZHONG UNIV OF SCI & TECH
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