Design And Development Of Digital Phase Measurement Instrument

As the rapid development of information technology and computer teehnology,digital signal proeessing teehnology has gradually developed into a key sciencetechnology. With the development of mature technology FPGA，a large number ofapplications already in use in digital signal proeessing. Phase measurement is of greatsignifieance in the power system, this thesis uses FPGA as the core data acquisition andsignal proeessing circuit mainly on how phase measurement will be applied to powersystem. This issue is based on the phase measurement needed in the power systeln, theaim to aehieve the two-frequency sine wave measurement for research. On the base oflots of in-depth analysis at domestic and foreign, all segments of phase in measurementsystem were studied. According to the work flow of the phase measurement in powersystem, the system is divided into signal conditioning modules, data acquisition andproeessing module, liquid crystal display modules. It will also design and debug thevarious modules. Also in accordance with the charaeteristics of the power system, itincreases the current, voltage measurements in Phase Measuring Instrument. In order toachieve requirements of low-Power, this subject choices EP2C8Q208C8in particular,using two1.5V batteries as a power supply and other components such as HT1621,TLC2252are also choose in accordance with the principle of low power consumption.The phase sensitivity of the tester high anti-interference ability is strong, accuratemeasurement, the use of reliable phase measurement accuracy of0.1°, the typicalresponse time is less than0.2s, measurement and tracking error is less than1%.