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Device for measuring and checking errors of digital mutual inductor

A technology for calibrating devices and transformers, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of lack of portable digital transformer errors, etc., and achieve the effect of fewer hardware circuits, easy debugging, and phase delay compensation

Active Publication Date: 2010-02-24
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no calibration method and calibration device for the error of portable digital transformers with digital output at home and abroad.

Method used

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  • Device for measuring and checking errors of digital mutual inductor
  • Device for measuring and checking errors of digital mutual inductor
  • Device for measuring and checking errors of digital mutual inductor

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Embodiment Construction

[0042] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0043] see figure 1 As shown, it is the overall functional block diagram of the measuring and verifying device of the digital transformer error of the present invention; the measuring and verifying device of the digital transformer error includes:

[0044]A phase self-calibration unit 3, used to generate a calibration signal; a standard transformer signal processing unit 1, used to receive the input signal of a standard transformer or the calibration signal, these two signals are realized by switching to a single For signal processing, the signal is processed to output a first analog signal and a corresponding first digital signal after analog / digital conversion; a processing unit 4 receives the first digital signal from The measured digital transformer 0 and the second digital signal synchronized with th...

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Abstract

The invention discloses a device for measuring and checking errors of a digital mutual inductor, which comprises a phase self-calibration unit, a standard mutual inductor signal processing unit, a processing unit and a digital phase-locked loop unit, wherein the phase self-calibration unit is used for generating a calibration signal; the standard mutual inductor signal processing unit is used forreceiving an input signal of a standard mutual inductor or the calibration signal, and outputting a first analog signal and a first digital signal which corresponds to the analog signal and is subjected to analog / digital conversion after the processing; the processing unit receives the first digital signal and a second digital signal which is from a digital mutual inductor to be tested and synchronous with the first digital signal, and analyzes and calculates fundamental components of various signals and harmonic components in each time to obtain an angular difference, a phase difference and aphase error of the digital mutual inductor to be tested; and the digital phase-locked loop unit receives and locks the first analog signal, and receives a frequency dividing ratio data signal which is emitted by the processing unit and is based on the sampling data of the digital mutual inductor to be tested to generate a sampling frequency signal to the standard mutual inductor signal processingunit.

Description

technical field [0001] The invention relates to an error measurement and verification device for a transformer, in particular to an error measurement and verification device for a digital current transformer and a digital voltage transformer. Background technique [0002] With the further increase of power system capacity and transmission voltage level, the traditional electromagnetic voltage and current transformers have some defects, such as insulation problems, electromagnetic interference problems, large volume and high cost, etc. Electromagnetic transformers can no longer meet the requirements With the development of the contemporary electric power industry, digital transformers can well solve the shortcomings of electromagnetic transformers. The digital transformer can directly provide digital signals to the metering protection device, which can simplify the secondary equipment, improve the accuracy and reliability of the entire system, help the integration of secondar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
Inventor 杜忠东邓泽官张蓬鹤
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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