Development Of On Site Comprehensive AC Electric Parameters Measuring Instrument

With the increase of the need of electric energy, the problem of electric energy shortage becomes more and more serious. In order to save and use electric energy reasonably and effectively.It is necessary to measure Ac electric parameters accurately and real-time,So the rapid development of industrial production requires measuring instrument with high level.During the operation of industrial devices,it demands real-time,on-line measurment of the multi-parameters for crect operation.Therefore,power system and users demand urgently a new type of safe, reliable, real-time and high-speed measuring instrument of AC parameters.This paper describes mainly system functions, measuring methods, circuit design, software program and errors analysis of a new type of measuring instrument.This instrument can measure and monitor electric parameters in single-phase circuits, three-phase(three-wire or four-wire)circuits.This system can be applied to electric devices and power plants, transformer substations with harmonic pollution.It can measure current,voltage,power,energy,frequence,power factor etc.It also can detect load quality, phase sequence, alarm, display and print results,as well as detect and dispose negative power.The controlling part of the comprehensive measuring instrument is 16 bits single-chip microprocessor 80C196KC.It is based on sampling theory and uses synchronous sampling algorithm to measure AC parameters of power system.It has many advantages as followed:complete functions, perfectperformance, portability,high-reliability,low cost and so on.