Study On Inverter Of Dielectric Loss Measurement Apparatus

Regular dielectric loss measurement is very necessary for the high voltage electric equipment in order to monitor its insulating state. The dielectric loss measurement is a test calling for high delicacy but the industrial power grid bring strong same-frequency interference comparative to the useful signals in the testing spot. The frequency conversion measurement method is the ultimate way to solve it. The inverter of dielectric loss measurement apparatus whose output voltage and frequency can be adjusted continuously is studied in this article based on what have be discussed above.This article expound the principle of inverter at the same time the selective harmonic elimination technology is studied. Based on the approximate answer made by homotopy method, the discrete phenomenon of Newton iterative loop is greatly cut down in the course of solving the SHET equation group. The on and off angles is memoried in the SCM's ROM. The software of SCM use its high speed output make control of IGBT by the way of consulting list. The output voltage is adjusted by changing on and off angle. The IGBT electrocircuit of driving and protecting is devised in this article as well as the negative partial voltage electrocircuit of IR2110. After the LC parameter of the Γ filter are confirmed in theory, they are validated by emulator. The inductance was designed and produced. After the system finished its shortage of hardware and software are mended by way of analyzing the oscillograph's output.The inverter system can be easily fixed into the dielectric loss testing apparatus because its simply framework and small volume. The dielectric loss testing apparatus who use the inverter system studied in this article can eliminate testing spot interference effectively and improve the precision of measure result.