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DSP-based frequency-conversion measurement circuit of transmission line power frequency parameters

A technology for measuring circuits and line workers, which is applied in the electrical field, can solve the problems of affecting the measurement results, the power frequency interference of the tested line, and the large influence of the meter readings, etc., and achieves the advantages of easy use, signal frequency and compact circuit structure. Effect

Inactive Publication Date: 2017-12-29
李福霞
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AI Technical Summary

Problems solved by technology

When using the power frequency method to measure line parameters, there are many problems: ① For multiple lines erected on the same pole, the adjacent lines may not be able to be powered off at the same time during the measurement. A certain power frequency signal should be sent to the line under test, which will bring power frequency interference to the line under test, which will directly affect the measurement results; ②Field tests often require bulky power supply devices such as transformers, voltage regulators, and various measuring meters And engineering vehicles, the wiring of the measuring meters must be changed to measure different parameters, which makes the test process more cumbersome; ③ It is necessary to connect 3 to 8 meters during the test, and the readings of each meter are greatly affected by human factors error; therefore, it is necessary to study new methods to measure power frequency parameters of transmission lines

Method used

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  • DSP-based frequency-conversion measurement circuit of transmission line power frequency parameters
  • DSP-based frequency-conversion measurement circuit of transmission line power frequency parameters
  • DSP-based frequency-conversion measurement circuit of transmission line power frequency parameters

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Embodiment Construction

[0021] The present invention will be further described below with reference to the drawings and embodiments.

[0022] Such as figure 1 In order to convert the voltage of the system from 0 to 400V into a voltage signal of 0 to 5V for measurement, the voltage sampling circuit connects resistors in parallel in the loop. Choose HA2841 op amp to improve accuracy. The current flowing through the resistor is 1mA, and the temperature of the resistor should be very small, so choose a resistor with greater accuracy.

[0023] Such as figure 2 , The current sampling circuit will use a transformer to convert the current signal. The HA2841 op amp is selected. When the measurement signal is 5A, the ratio of the primary side and the secondary coil is 1:500. The input of the device is generally voltage, so it is necessary to convert the current signal into a voltage signal. Only a 500 ohm resistor is connected to the current output terminal to convert a 10 mA current into a 5 volt voltage.

[0024]...

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Abstract

A DSP-based frequency conversion measurement circuit for power frequency parameters of transmission lines is applicable to the electrical field. The frequency conversion measurement circuit of the power frequency parameters of the transmission line is composed of a voltage sampling circuit, a current sampling circuit, an A / D conversion circuit, a frequency tracking circuit and a voltage conversion circuit. The circuit uses the frequency conversion method to measure the power frequency parameters of the transmission line, which can monitor the frequency change of the input signal in real time, and track the measured frequency in real time to ensure that the sampling frequency is synchronized with the signal frequency.

Description

Technical field [0001] The invention relates to a DSP-based frequency conversion measurement circuit for power frequency parameters of transmission lines, which is suitable for the electrical field. Background technique [0002] Transmission line is an important part of power system. Its power frequency parameters generally include DC resistance, positive sequence impedance, zero sequence impedance, positive sequence capacitance, zero sequence capacitance, and mutual inductance impedance and coupling capacitance between multiple parallel lines. These parameters are used in power system flow calculation, short-circuit current calculation, relay protection setting calculation, power system operation mode selection and power system mathematical model establishment. Generally, the power frequency parameters of the transmission line can be obtained through theoretical calculations. However, due to the influence of many factors, the power frequency parameters of the transmission line ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 李福霞
Owner 李福霞
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