Three-phase transformers are widely used in circuits with AC voltage below 660V from 50Hz to 60Hz, and are widely used in imported important equipment, precision machine tools, mechanical and electronic equipment, medical instruments, rectifier devices, lighting and so on. Various input and output voltages, wiring groups, the number and position of regulating taps (generally 5%), the distribution of winding capacity, the equipment of secondary single-phase winding, the application of rectifier circuit, whether it is required to have a shell, etc. This product can be carefully designed and manufactured according to the requirements of users.
By establishing a new neutral line-grounding in the three-phase transformer, the interference of * * mode and other neutral lines in the power grid can be alleviated. The three-phase transformer transforms the three-wire triangular connection into a four-wire Yo system, and further eliminates the high-frequency pulse interference and noise coupled by the transformer by adding shielding. Although shielding the three-phase transformer can effectively prevent all kinds of N-G interference (pulse and high-frequency noise), the transformer must be grounded correctly, otherwise the anti-* mode interference is ineffective.
Transformer is a device for converting AC voltage, current and impedance. When alternating current passes through the primary coil, alternating magnetic flux is generated in the iron core (or magnetic core), and voltage (or current) is induced in the secondary coil. With the continuous development of transformer industry, more and more industries and enterprises have applied transformers and more and more enterprises have entered the transformer industry. A transformer consists of an iron core (or magnetic core) and a coil. The coil has two or more windings, of which the winding connected to the power supply is called the primary coil and the rest is called the secondary coil.
Transformer parameter variable
Browsing times: Notes on three-phase transformer parameter variables and several non-main parameters of three-phase transformer parameter variables.
1 Rated power is the characteristic symbol parameter variable of current transformer at frequency and voltage.
2. The rated voltage determines the voltage applied to the transformer coil. The transformer can work for a long time without exceeding the output power of temperature rise.
3 Voltage ratio refers to the ratio of higher voltage to secondary voltage of transformer, and there is no difference between no-load voltage ratio and load voltage ratio.
4 Working frequency The frequency of transformer core damage has a great relationship with loss, and it should be conceived and utilized according to the utilization frequency, which is called working frequency.
5 Rate refers to the ratio of secondary power P2 to primary power P 1. As long as the rated power of the transformer is larger, the speed will be higher.
No-load loss refers to the power loss measured at a higher level when the secondary side of the transformer is connected. The non-main loss is the iron core loss, followed by the loss (copper loss) caused by no-load current on the copper resistance of the primary coil, which is smaller.
7 No-load current There is still no definite current when the secondary of the three-phase transformer is connected, and the current in that department is called no-load current. No-load current consists of magnetizing current (generating magnetic flux) and iron loss current (caused by iron core loss). For 50Hz current transformer, the base level of no-load current is higher than magnetizing current.
The insulation resistance privately indicates the insulation between the coils of the transformer and between the cores of the coils. The inhomogeneity of insulation resistance is related to the function of insulation data, the inhomogeneity of temperature and the degree of wetting.
Power calculation:
U is line voltage, I is line current, apparent power: S= 1.732UI, active power: P = SCOS φ, reactive power: Q = SSIN φ, and power factor: COS φ = P/S.
Three-phase power supply = three-way single-phase power supply summary
Three-phase rated power = root number three × rated current × rated line voltage (380 V) = three-phase × rated current × rated phase voltage (220V)
Namely:? P= 1.732×I×U line =3×I×U phase.
Three-phase transformers are widely used in many places, such as textile machinery, printing and packaging, industrial and commercial enterprises and so on. Of course, household appliances and high-rise buildings are definitely used the most. Think about it, three-phase transformers are so widely used that they are super powerful and unparalleled. Where can I find such high isolation performance and good voltage conversion? Three-phase transformer, of course! As long as there is a three-phase transformer at home, what is there to be afraid of? Resistance and voltage are not a problem.
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