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Power transmission line power frequency parameters measuring method and device

A technology for parameter measurement and transmission lines, applied in the direction of measurement devices, impedance measurement, and measurement of electrical variables, can solve problems such as principle defects and insufficient technical content, and achieve the effects of avoiding capacity increase, improving signal-to-noise ratio, and reducing errors

Inactive Publication Date: 2010-05-19
WUHAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the principle defects and insufficient technical content of the existing power frequency parameter measurement method, and provide an intelligent and efficient new transmission line power frequency parameter measurement scheme that can overcome the interference of adjacent lines

Method used

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  • Power transmission line power frequency parameters measuring method and device
  • Power transmission line power frequency parameters measuring method and device
  • Power transmission line power frequency parameters measuring method and device

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Embodiment Construction

[0028] The transmission line parameter measurement method provided by the present invention applies the signal source for measurement to the transmission line, and then collects the basic circuit parameters of the transmission line. The difference from the existing transmission line parameter measurement method is that the transmission is measured by sweeping the frequency in the range of 100-2000HZ intermediate frequency Line, set the frequency of the signal source for measurement according to the signal-to-noise ratio of the measurement signal, set the voltage of the signal source for measurement according to the length of the transmission line, and calculate the equivalent parameters of the power frequency of the transmission line after collecting the basic circuit parameters of the transmission line. Since the main source of interference on the measurement line comes from the power frequency induced voltage generated by adjacent lines, and the grid frequency is relatively fi...

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Abstract

This invention belongs to power measuring technique region, relates to a line frequency parameter measurement and device of electric transmission line. The trait is: measuring electric transmission line by frequency sweeping at intermediate frqquency range of 100 to 2000hz, base on Signal-to-Noise Ratio of measuring signal to set frequency of supply oscillator used for measuring. Base on length ofelectric transmission line to set voltage of supply oscillator for measuring. picking up fundamental circuit parameter of electric transmission line, then calculate and obtain line frequency equivalent parameter of electric transmission line; line frequency parameter measurement device of electric transmission line includes control system that takes singlechip as controlling center, brainpower numerical control frequency conversion transform power that operated by singlechip, voltage and electric current sensing circuit, digital filter and signal acquisition circuit. Power supply of brainpower numerical controlling, frequency conversion and variable voltage supply signal source to electric transmission line. Electric transmission line detects the signal and then sends to digital filter and signal acquisition circuit. Digital filter and signal acquisition circuit would turn circuit signal to fundamental circuit parameter, and send into singlechip.

Description

technical field [0001] The invention belongs to the technical field of electric power measurement, in particular to a method and a device for measuring power frequency parameters of power transmission lines. Background technique [0002] Transmission lines are an important part of power systems, and line parameters need to be measured at the initial stage of line construction. Moreover, although these physical parameters will not change for a considerable period of time, the line parameters may change due to the aging of the conductor after long-term operation, changes in soil resistivity, or the influence of climate, environment and geographical factors. Therefore, the power dispatching department requires actual measurement of the power frequency parameters of the transmission line. Power frequency parameters generally include DC resistance, positive-sequence impedance, phase-to-phase capacitance, positive-sequence capacitance, zero-sequence capacitance, and coupling capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02G01R27/16G01R27/26
Inventor 郑贵林张志锋杨祥国
Owner WUHAN UNIV
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