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Measuring device and method for measurement errors of electric measurement meter in frequency fluctuation process

A frequency fluctuation and measurement error technology, which is applied in the field of electric power measurement, can solve the problems of inability to quantitatively evaluate the influence of frequency fluctuation on the measurement accuracy of electric measuring instruments

Active Publication Date: 2014-07-30
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0004] The object of the present invention is to provide a measuring device for accurately measuring the electrical measuring instrument when the signal frequency fluctuates according to the set mode in order to solve the practical problem that the influence of frequency fluctuation on the measurement accuracy of the electrical measuring instrument cannot be quantitatively evaluated at present. measurement error; at the same time, a measurement method based on the measurement device is proposed to measure the measurement error of the electrical measuring instrument when the voltage and current signal frequency fluctuates

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  • Measuring device and method for measurement errors of electric measurement meter in frequency fluctuation process
  • Measuring device and method for measurement errors of electric measurement meter in frequency fluctuation process
  • Measuring device and method for measurement errors of electric measurement meter in frequency fluctuation process

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0039] Such as figure 1 As shown, the measuring device of the present invention includes a control system 10 , a measured meter 20 , a power source 30 , a standard meter 40 , and a frequency control unit 50 and a frequency conversion unit 60 . During actual work, the meter to be tested is placed on the epi-position 20 of the meter to be tested.

[0040] The control system 10 can adopt a PC, which is used for the man-machine dialogue between the testing device and its user, sending commands and transmitting data to other parts of the measuring device. In this embodiment, the control system 10 sends the serial port A signal to the frequency control unit 50 through the serial port A, and sends the serial port B signal to the power source 30 through the serial port B, and both the serial port A and the serial port B are RS232 interf...

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Abstract

The invention relates to a measuring device and method for measurement errors of an electric measurement meter in the frequency fluctuation process. The measuring device for the measurement errors of the electric measurement meter in the frequency fluctuation process comprises a control system, a meter position of a meter to be measured, a power source, a standard meter, a frequency control unit and a frequency conversion unit. The measuring device is used for accurately measuring the measurement errors of the electric measurement meter when signal frequency fluctuates in a set mode, the frequency of voltage and current signals output by the device can fluctuate in the artificially set mode, and the standard meter of the device can achieve complete synchronous sampling under the signal conditions of frequency fluctuation. The invention provides a measuring method based on the measuring device, and the measuring method is used for measuring the measurement errors of the electric measurement meter in the fluctuation process of the voltage and current signals. The measuring device and method are suitable for measuring the measurement errors of the electric measurement meter in the fluctuation process of the voltage and current signals.

Description

technical field [0001] The invention relates to a device and method for measuring the measurement error of an electric measuring instrument when frequency fluctuates, belonging to the technical field of electric power measurement. Background technique [0002] In the current electrical measuring instruments, the measurement method of sampling calculation is widely used, that is, sampling is performed through analog-to-digital conversion first, and the analog signal is converted into a digital signal, and then the measurement result is obtained through calculation by MCU or DSP. During the sampling process, if the sampling frequency f s with the frequency f of the measured voltage and current signal p The relationship that cannot be an integer multiple, that is, f s ≠nf p (n is any positive integer), at this time, it is asynchronous sampling, which will cause problems such as spectrum leakage, which often leads to deviations in calculation or analysis results. In order to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 马建刘强王爱民陈克绪
Owner STATE GRID CORP OF CHINA
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