Frequency Characteristic Testing System of Electronic Potential Transformer

A technology of voltage transformer and frequency characteristics, which is applied in the field of frequency characteristic detection system of electronic voltage transformers, to achieve the effects of wide frequency range, elimination of error influence, and high test accuracy

Active Publication Date: 2016-10-12
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the problem that there is no special test scheme and system for the frequency characteristics of EVT in the prior art, so as to improve the accurate measurement of harmonics by EVT

Method used

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  • Frequency Characteristic Testing System of Electronic Potential Transformer

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, a frequency characteristic detection system of an electronic voltage transformer is characterized in that it includes a variable frequency power supply, a boost unit, a high frequency voltage divider, a merging unit and a frequency characteristic detection unit, and the input terminal of the variable frequency power supply is externally connected to The power frequency single-phase 220V power supply, the rated voltage of the output terminal of the variable frequency power supply, the range of the rated voltage is 0-250V, the frequency range is 20-3000Hz, and the capacity is 10KVA. Measuring electronic voltage transformers provide primary side high voltage U1 of different voltage levels used in the test, primary side high voltage U1, the frequency remains unchanged, and the amplitude increases. The 13th harmonic voltage, the electronic...

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Abstract

The invention discloses a frequency characteristic detection system of an electronic voltage transformer, which comprises a frequency conversion power supply, a boost unit, a high-frequency voltage divider, a combination unit and a frequency characteristic detection unit, and the rated voltage of the output end of the frequency conversion power supply passes through the boost unit Adjust the voltage amplitude of the power supply to provide the primary side high voltage U1 used in the test for the electronic voltage transformer to be tested. The primary side high voltage U1 is converted into a low voltage U2 through a high frequency divider, which is used as the standard for the frequency characteristic detection unit The source signal and the sampling value of the electronic voltage transformer to be tested are sent to the frequency characteristic detection unit through the merging unit as the measured signal of the frequency characteristic detection unit. The frequency characteristic detection system of the electronic voltage transformer of the present invention can reliably and perfectly detect the frequency characteristics of the electronic voltage transformer, and aims to improve the frequency transmission performance of the electronic voltage transformer. Provide technical support for safe and stable operation.

Description

technical field [0001] The invention relates to the technical field of smart grid detection, in particular to a frequency characteristic detection system of an electronic voltage transformer. Background technique [0002] With the rapid development of the smart grid, electronic voltage transformers (EVT) have been widely used in the smart grid. Wave and other IED equipment, its performance directly affects the operation of IED equipment. [0003] Due to the impact of nonlinear loads in smart grids, flexible AC transmission systems, power electronics technology, rail transit, transformer no-load closing, etc., a large number of harmonics will be generated in smart grids, and the amount of harmonics is related to the voltage of smart grids. Levels are closely related. Harmonics are sine wave components of a periodic electrical quantity, including higher harmonics whose frequency is an integer multiple of the fundamental frequency, and fractional harmonics or interharmonics wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/02
Inventor 孙健袁晓冬汤汉松罗强卜强生张剑朱卫平
Owner STATE GRID CORP OF CHINA
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