How to choose a power transformer, know how to choose a transformer for power

1. First of all, know how big is your load? Usually the capacity range of the transformer is specified in the regulations, if your load is a 450kw motor, then you choose a 630kVA distribution transformer is enough, such a small capacity transformer 10kV power supply is enough.

2. If the load is relatively large, such as more than 3000kw, then you can consider using 35kv voltage to supply power, choose 35 10kv transformer, 3. If it is more than 30,000, then it is recommended that you choose a 110kv power supply transformer.

4. If you exceed 2000kw, then you can apply for a special line power supply of more than 10kv to the power supply bureau, and your transformer is a good choice.

5. If it is lower than 2000, it may be used in the public network line T, then it is to use a small-capacity transformer.

Power transformers are usually divided into dry-type transformers and oil-immersed transformers by insulation, and there is not much difference between them in use; The grid voltage has different levels such as 10kV and 35kv, which depends on the external line of the power bureau to your access place; The second is to choose the capacity of the power transformer according to the electricity consumption.

Call your local power supply company**, the simplest, they will tell you everything, and if you want to install a transformer, you absolutely can't do without the local national grid, you need to apply, then design, then construction, and then the power bureau and then acceptance. So you just need to explain to them what you are using a transformer.

Assuming that the power is 230kw, then the demand coefficient of the equipment is set as tg as active power = 230 * reactive power = apparent power = active power + reactive power apparent power = 315kva can be selected, 400kva can also be selected, if there is only this machine There are other equipment that choose 315 Then choose 400.

It is selected according to the load situation of the circuit system. In order to improve the utilization rate of the transformer and reduce the loss, it is more reasonable when the load current of the transformer is 75 85% of the rated current.

1. Determine the load type and select the typical daily load curve.

2. Determine the equivalent air temperature δ; The ambient temperature in the IEC standard is not the average temperature of the environment, but the equivalent air temperature, which means that in the time interval, under load, if the δ remains unchanged, the deterioration of the insulation is equal to the deterioration of the insulation when the air temperature changes naturally; It is suggested that the Jiangnan region should take 20 from the Jiangbei region, and the northwest and northeast regions should be taken from the northeast region.

3. According to the estimated maximum load value (kVA), check the table to determine the rated quality SN of the selected transformer. For example: load curve i, the annual equivalent air temperature is 9; The maximum load is 1000 kVA, and the distribution transformer of 800 kVA should be selected.

4. According to the environmental conditions and the type of negative load, determine the normal overload capacity of the working transformer. For example, the class VI load curve, the annual equivalent air temperature is 22, the frontal capacity of the working transformer is 315 kVA, and the maximum load of the transformer energy band is 340 kVA.

It should be noted that the transformer capacity is selected according to the above method, and the maximum load continuous operation time should be restricted in actual operation to ensure safety. If the allowable time is exceeded, there is still a danger of burning the transformer.

The transformer efficiency is calculated, the transformer capacity: 230, and the transformer of 300kVA should be selected.

A transformer is a device that uses the principle of electromagnetic induction to change the alternating voltage, and the main components are the primary coil, the secondary coil and the iron core (magnetic core).

The main functions include voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization, etc. According to the use, it can be divided into: power transformer and special transformer (electric furnace transformer, rectifier transformer, power frequency test transformer, voltage regulator, mining transformer, audio transformer, intermediate frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer, reactor, transformer, etc.).