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Method for measuring harmonic accuracy of electronic voltage transformer, and error analysis method

A technology of voltage transformer and measurement method, which is applied in the field of measurement method and error analysis of electronic voltage transformer harmonic accuracy, and can solve the problem of electronic voltage transformer non-existence and electronic voltage transformer harmonic accuracy Determination has not yet been carried out and other issues

Inactive Publication Date: 2017-06-20
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0005] At the present stage, there is no measuring device or method for measuring the harmonic accuracy of electronic voltage transformers, and the measurement of harmonic accuracy of electronic voltage transformers has not yet been carried out.

Method used

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  • Method for measuring harmonic accuracy of electronic voltage transformer, and error analysis method
  • Method for measuring harmonic accuracy of electronic voltage transformer, and error analysis method
  • Method for measuring harmonic accuracy of electronic voltage transformer, and error analysis method

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0047] A method for measuring the harmonic accuracy of an electronic voltage transformer, comprising the following steps:

[0048] A: Connect the high-voltage side of the capacitive voltage divider in parallel with the primary side of the electronic voltage transformer to be tested, and apply a harmonic voltage; the harmonic voltage is the simulated harmonic voltage, which is the grid reference voltage superimposed on each harmonic wave component. To meet different testing needs, its composition and content are variable and similar to the actual operation of the grid;

[0049] B: connecting the low-voltage side of the capacitive voltage divider to a voltage follower and outputtin...

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Abstract

The invention discloses a method for measuring the harmonic accuracy of an electronic voltage transformer, and the method comprises the steps: enabling a high-voltage side of a capacitive voltage divider to be in parallel connection with a primary side of the electronic voltage transformer, applying a harmonic voltage, carrying out the Fourier transform of digital signals of two sides through a data processing unit, and obtaining the spectrums of the digital signals, wherein the spectrums comprise amplitude spectrums and phase spectrums; taking the digital signal of the capacitive voltage divider as the reference, calculating the amplitude error and phase angle error of the digital signal of the electronic voltage transformer, and obtaining the harmonic accuracy of a to-be-detected electronic voltage transformer. The method can achieve the overall verification of the harmonic accuracy of the electronic voltage transformer, meets the test demands of electronic transformers, and detects the harmonic measurement capability of the electronic transformers truly and effectively.

Description

technical field [0001] The invention relates to the technical field of harmonic measurement, in particular to a method for measuring the harmonic accuracy of an electronic voltage transformer and an error analysis method. Background technique [0002] Due to the use of special devices (non-linear loads, FACTS, rail transit), harmonics are generated on the grid. The amount of harmonics is related to the grid and voltage level. Harmonics have an impact on metrology, quality measurement and relay protection. [0003] Electronic transformers are used for system measurement or protection, and are the core components of the power grid. Its harmonic response characteristics are the key factors for accurate measurement of harmonics. Therefore, it is of great theoretical and practical significance to detect the harmonic characteristics of electronic transformers and master their harmonic response performance. [0004] Electronic transformer standards GB / T 20840.8-2007 and IEC6004...

Claims

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Application Information

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IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 刘翔童悦王晓周叶国雄胡蓓邓小聘黄华代静汪英英刘彬熊俊军万罡王佳颖冯利民王朔
Owner CHINA ELECTRIC POWER RES INST
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