For the load, the concept of load coefficient is the probability that the load is used at the same time, also called demand coefficient or simultaneous coefficient, which is the probability of the equipment being used at the same time. When both are used at the same time, the coefficient is 1. Of course, it can also be calculated according to the actual situation, and the power factor is 0.80.
Transformer is a device that uses electromagnetic induction principle to change AC voltage. The main components are primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer) and so on. According to the purpose can be divided into:
Power transformers and special transformers (furnace transformers, rectifier transformers, power frequency test transformers, voltage regulators, mine transformers, audio transformers, intermediate frequency transformers, high frequency transformers, impulse transformers, instrument transformers, electronic transformers, reactors, transformers, etc.). ). t is usually used as the beginning of circuit symbols. Examples: T0 1, T20 1, etc.
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Development history
Faraday invented an "inductance ring" on August 29th, 183 1, which is actually the prototype of the first transformer in the world. But Faraday only used it to demonstrate the principle of electromagnetic induction, without considering its practical use.
188 1 year, Lucien Gaulard and John Dixon Gibbs demonstrated a device called "second-hand generator" in London, and then sold this technology to Westinghouse. This may be the first practical power transformer, but it is not the earliest transformer.
1884, Lucerne Gorard and John Dixon Gibbs showed their electric lighting equipment in Turin, Italy. Early transformers used linear cores, which were later replaced by more efficient ring cores.
William Stanley, an engineer from Westinghouse, bought the patent of transformer from George Westinghouse, Lv Xian Gorard and John Dixon Gibbs, and made the first practical transformer in 1885. Later, the iron core of the transformer was made of E-shaped iron sheet, and 1886 was put into commercial use.
The principle of transformer transformation was first discovered by Faraday, but it was not put into practical application until 1980s. In the competition between DC and AC power plants, it is one of its advantages that transformers can be used for AC power.
Transformer can convert electric energy into high voltage and low current, and then convert it back, thus greatly reducing the loss of electric energy in the transmission process and making the economic transmission distance of electric energy reach a longer distance. In this way, power plants can be built far away from electricity consumption. Most of the electricity in the world has to go through a series of conversions before it finally reaches the users.
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