What transformer is good to buy? How to choose a transformer?

The ** of the transformer is about a few hundred yuan per unit, the cheap one has one or two hundred yuan, and the expensive one has several thousand yuan. Different types of transformers** are also different. In terms of categories, the classification of commonly used transformers can be summarized as follows:

1. According to the number of phases: 1) Single-phase transformer: used for single-phase load and three-phase transformer group.

2) Three-phase transformer: used for the rise and fall voltage of the three-phase system. 2. According to the cooling method:

1) Dry-type transformer: relying on air convection for natural cooling or increasing fan cooling, mostly used in high-rise buildings, high-speed toll stations and local lighting, electronic circuits and other small-capacity transformers. 2) Oil-immersed transformer:

Relying on oil as the cooling medium, such as oil immersion self-cooling, oil immersion air cooling, oil immersion water cooling, forced oil circulation, etc. 3. According to the use: 1) Power transformer:

for transmission and distribution systems....

Because the power consumption of hair dryer is mainly used for heaters, and so is the curling iron, so the first solution to the problem is to buy a transformer with more than 1300w and 220v and 100v, so that it can be used by two electrical appliances at the same time, but the transformer is larger in size and weight, simple, more reliable but inconvenient.

Because these two devices can be regarded as resistive loads (hair dryer motors have less power), another feasible way is to use a bidirectional thyristor voltage regulating circuit to adjust the AC 220V voltage to 100V for use, saving cost, volume, and weight.

When choosing a transformer, you can not choose too large or too small, and you can choose the transformer capacity according to the following methods.

One important piece of data that is not provided is the simultaneous coefficient of load. The ratio of the actual load carried by the transformer to the rated power of the equipment is called the load factor of the transformer. For loads, the concept of load factor is the probability that the load is used at the same time, also known as the need factor or the simultaneous coefficient, which is the probability of the equipment being used at the same time.

The total load is 300kw, but there is a probability that they are used at the same time, and this probability is the load factor. It is not always possible to use them at the same time. If you use both of them, the coefficient is 1.

Of course, you can calculate it yourself according to the actual situation, and choose the power factor.

With this formula, s=p*kx cos

The capacity of the transformer s = the rated power of the equipment p the load rate of the transformer kx the power factor cos = (300 kx).

This is the transformer capacity.

I don't know under what circumstances the motor is used, so I can't calculate it, so I can only calculate the simultaneous coefficient and incorporate it into the above formula. If the coefficient of the same time is, the result is about 340 kVA, if it is used at the same time, it is 375kva, considering a certain margin and reserve capacity, then choose 400kva.

Based on the above considerations, especially considering the starting current factor of the motor, it is more reliable to choose a transformer. Try to rely on the big and not the small. And the standard capacity level of the transformer is kva, 315kva is a bit small, 500kva is big and it is not necessary.

So go for 400kva.

The main function of the transformer is to transmit electrical energy, and the rated capacity is its main parameter. So about.

The first thing to pay attention to is to choose the rated capacity of the transformer.

For example, the rated capacity of a double-winding transformer is the rated capacity of the winding.

Multi-winding transformers should specify the rated capacity of each winding. Its rated capacity is the rated capacity of the winding with a large amount; When the capacity of the transformer is changed by the cooling method, the rated capacity refers to the large capacity.

At present, the rated capacity grade of transformers in China is increased by multiples, such as the capacity is ......KVA, etc., only the capacity classes other than 30 kVA and 63,000 kVA differ from the priority number system.

Before 1967, the rated capacity class of transformers was the R8 capacity series increased by R8=8 multiples.

The capacity of the transformer is also closely related to the voltage level. When the voltage is low and the capacity is large, the current is large, and the loss increases; The voltage is high, the insulation ratio is too large in the capacity hour, and the transformer size is relatively large, so the capacity with low voltage must be small, and the capacity with high voltage must be large.

In order to transmit the electric energy generated by the power plant economically, rationally distribute it and use it safely, power transformers are used; A power transformer is a stationary electrical appliance, so how does it work?

In fact, the power transformer is composed of two or more windings around the same core, and the windings are connected with each other through alternating magnetic flux, and its function is to change one level of voltage and current into another level of voltage and current of the same frequency, and also change the number of phases, impedance and phase.

Now there are many types of transformers in China, so how to choose the type of transformer to suit your needs?

Power transformers are generally divided into power transformers and special transformers, the former is an important equipment for power transmission and distribution in the power system, according to the use, step-up transformers, step-down transformers, distribution transformers and contact transformers; According to the structure, double-winding transformer, three-winding transformer and self-lotus transformer; According to the number of phases, single-phase transformers, three-phase transformers and multi-phase transformers. The choice of transformer requires you to refer to and judge in many aspects. Shandong Kerman Electric **** is a professional manufacturer of transformers, high quality, low **, recommended to go to the official website of Kermante to see.

The capacity of the transformer is determined according to the nature and size of the load.

The ratio is selected according to the supply voltage and the voltage required by the load.