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The Design of Measure System for Power Frequency Parameters of Power Transmission Line

Author: SunPengFei
Tutor: ChangTieYuan
School: Hebei University
Course: Communication and Information System
Keywords: SCM system A / D converter Frequency Parameters Transmission and distribution lines Measuring
CLC: TM935.1
Type: Master's thesis
Year: 2006
Downloads: 170
Quote: 5
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Abstract


The research and design of an automatic measurement of the transmission line parameters of the transmission and distribution of intelligent instrumentation . The instrument can automatically measure the power frequency parameters , display , store and print the results , with high measurement accuracy , reduce the staff strength of the field test , and improve work efficiency . Instrument control system uses a more advanced microcontroller system , A / D converter with a high-speed , low -power , dual 12 - bit A / D converter chip ADS7864 6-channel simultaneous sampling . It can simultaneously for 6 inputs to three - phase AC analog signal at a high - speed , high-precision conversion , to reduce aperture errors , three - phase alternating current signal , particularly improved by an order of magnitude in the measurement of the active power , and simplify the design of the circuit . To the ADS7864 -frequency parameter measurement system devices . Using high-performance single-chip , respectively, as the control board and the measurement of sub- board CPU . A guide to the transmission and distribution line on the road , the three - phase AC voltage through the voltage transformer PT and the current transformer CT , the current signal. This six - way AC signal by the programmable gain adjustment circuit, after entering ADS7864 hardware filter circuit performs A / D conversion . The result of the conversion to adaptive digital filtering to reduce external interference , the filtered data is used to calculate the parameters of the three-phase AC and transmission and distribution lines -frequency parameters . The instrument provides a friendly man-machine interface , with the ranks of the matrix keyboard , large-screen LCD display and micro printer .

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CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Frequency, waveform parameter measurement and instrumentation > Wavelength,frequency ( time) measurement and instrumentation
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