The Design Of Measure System For Power Frequency Parameters Of Power Transmission Line

Design a kind of intellectualized instrument, which can automatically measure powerfrequency parameters of power transmission line. The instrument can automatically measurepower frequency parameters of power transmission line with high measure accuracy, play,save, print result, ease the spot test personnel's work strength consumedly, improve themeasure accuracy and efficiency. Use modern advanced singlechip system as the controlsystem of the instrument, and use high speed,low power, dual 12-bit A/D converters,6-channel simultaneous sampling ADS7864 as A/D converter. It can simultaneously convertthe 6-channel AC analog signal input with high speed and high accuracy, reduce apertureeffect, improve an order of magnitude of measure for 3-phase AC signal, especially foractive power, and simplify the circuit design. Make ADS7864 as the main chip of powerfrequency parameters of power transmission line measure system.High performance singlechips are respectively used as CPU of control main board andmeasure sub board. Use PT and CT to get AC voltage and current signal. The voltage,current signal goes through program control gain adoption circuit, the hardware filter circuitjuniors, then converted by an A/D. Before calculating the 3-phase AC parameters andfrequency parameters of power transmission line, the system software makes an adoptivefilter for the converted signal to reduce the external interference.The system provides with the row or column matrix type keyboard, big screen LCDand the miniature printer to make man-machine conversation easy.