Development of Digital Measuring Instrument for Dielectric Loss Tangent

The dielectric loss tangent measurement is an important normal item to test the insulation condition of high voltage equipment in an electric power system. This paper describes a measurement method—improved fundamental harmonic separation algorithm which is used for measuring the dielectric loss of the electric equipment. According to this measurement method, a digital measuring instrument for dielectric loss tangent which is based on 80C196KC single-chip microcomputer is designed. Its hardware circuit and software programs are described briefly. The instrument takes a series of anti jamming measures in the hardware circuit and software procedure. It can realize many functions, such as automatic measurement, running parameters and mode setting, data display and printing. The experiment results show that the instrument has high precision of measurement, high stability and reliability, strong anti jamming ability, easy to operate and so on.