电力变压器匝比测试仪

Instrument for measuering dectric power transformer coil ratio

介绍了电力变压器匝比测试仪的两个部分：测试电源和测试电路．经Ｄ／Ａ转换、滤波、功率放大及变压器后，获得测试所需的精密电源．测试电路以８０３１为微处理器，配以自动组别切换电路、极性判别电路等，能自动测出任意组别变压器的匝比、误差等，并打印．

This paper states the principle of measurement of the electric power trsnstormer coil ratio,and introduces two parts of the instrument for measurement of electric power transformer coil ratio:measuring power and measuring circuit. In the measuring power, the single-chip microcomputer is usedto generate sine signal. The precise power supply is obtained by D/A converter, filter, power amplifierand transformer. The measuring circuit utilizes 8031 as microprocessor, matched with the circuit forautomatic change of the groups of the coil, the polarity diatinguishing circuits, and so on. It canmeasure the coil ratio of any group of the transformer, the error, and so on, and can also print theresult.