Frequency characteristic detecting system of electronic type voltage transformer

A technology of voltage transformer and frequency characteristics, applied in the field of frequency characteristics detection system of electronic voltage transformer, to achieve the effects of high test accuracy, improved frequency transmission performance, and elimination of error effects

Active Publication Date: 2014-01-08
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
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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 detecting system of electronic type voltage transformer

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Embodiment Construction

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

[0023] like 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 vo...

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Abstract

The invention discloses a frequency characteristic detecting system of an electronic type voltage transformer. The frequency characteristic detecting system comprises a frequency conversion power supply, a boosting unit, a high frequency voltage divider, a merging unit and a frequency characteristic detecting unit. The nominal voltage of the output end of the frequency conversion power supply adjusts the voltage amplitude of a power supply through the boosting unit to supply the primary side high voltage U1 used in an experiment to the electronic type voltage transformer to be detected; the primary side high voltage U1 is converted into the low voltage U2 through the high frequency voltage divider, and the low voltage U2 is used as standard source signals of the frequency characteristic detecting unit; the sampling value of the electronic type voltage transformer to be detected is sent to the frequency characteristic detecting unit through the merging unit, and the sampling value is used as detected signals of the frequency characteristic detecting unit. The frequency characteristic detecting system of the electronic type voltage transformer can reliably and perfectly detect the frequency characteristics of the electronic type voltage transformer, and aims to improve the frequency transmission performance of the electronic type voltage transformer and provide the technical guarantee for safe and stable operation of the electronic type voltage transformer.

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 Applications(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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