Overview of the working principle of power transformer
power transformer is an electrical equipment that transforms voltage to achieve energy transmission and distribution. According to Hooke's law, the turn ratio of transformer is one of the most important parameters, which directly affects the safe operation of electricity. Transformer turn ratio tester is an instrument specially used to measure transformer turn ratio and tapping point
it takes the 51 series single chip machine as the microprocessor in the process of operating the universal experimental machine, and adopts group switching circuit, automatic shift circuit and polarity discrimination circuit, which is convenient and reliable to use. The accuracy of the whole instrument is guaranteed by two high-precision double integral a/d converters, precision rectifier circuits, programmable gain amplifiers and precision transformers. After many field tests, it has been proved that compared with similar products at home and abroad, this instrument has high accuracy and reliability, easy to use, powerful function, and is suitable for promotion and use in domestic power departments
according to the principle that the turn ratio of the transformer is equal to the primary and secondary voltage ratio of the transformer, By changing pressure, he said: "When the group withdraws the experimental machine, it is required to understand that the experimental power will increase the primary plus test voltage of the group's profitability device, and then carry out a/d conversion of its primary and secondary voltages at the same time, and then shift to the corresponding gear through the microprocessor for testing, calculation, storage and display.
in order to maintain the stability of the output voltage, large power transformers are usually equipped with positive and negative tapping points on the basis of the rated turn ratio to make the turns The ratio can be fine tuned up and down. At the peak of power consumption, when the voltage is low, the turn ratio is reduced and the output voltage is increased by reducing the tapping point; When the power consumption is low and the voltage is high, the turn ratio is increased and the output voltage is reduced by increasing the tapping point. The tapping points are proportional, which is called tapping value. As long as the turn ratio is measured and the tapping value and rated turn ratio are known, the tapping point can also be calculated
Copyright © 2011 JIN SHI