Examination terminal of low voltage distribution
system’s electricity parameters research
Abstract: The electrical parameter examination technology, as the foundation of the electrical network automation control, plays an extremely vital role in the electrical network security economy movement aspect. The design is realized complex electric parameter transducer based on single chip, no matter of signal sampling or data handling are all fulfilled by single chip. The hardware design have completed altering current and altering voltage input circuit, analog to digital conversion circuit, phase-lock doubling circuit and communication interface, display interface , keyboard circuit. Meanwhile, the part of software has realized the function of the alternating electricity parameter analysis, the directing electricity parameter analysis and the demonstration, which is taking the sampled data in a sampling cycle as the examination object, and carrying on the analysis with the digital signal processing technology to the sampling data, and then programming with single chip. Finally, the harmonic analysis, using the Forier Transform Algorithm, filter the whole time harmonics which are less than 10 order and have a good effect on the filtration of the high frequency non-whole time harmonics. This intelligent transducer has high computation precision and velocity, outstanding capability and the facility of counter interference. This intelligent transducer, realizes the real-time examination and control the directly connecting strong electricity equipment in the local production processing, simultaneously communication through the system network, play an important role in the generate electricity examination and using electricity supervision.
Key words: quantity of electricity, intelligent transducer, measurement, Single chip, synchronized sampling, algorithm, serial communication
