How to choose the best operating capacity of the transformer according to the electrical load.

The problem is not to design a transformer application, but to design a transformer for power engineers.

There are many transformers that generate a lot of heat when they are not loaded, because there is no load degaussing effect, which leads to magnetic saturation and the core design is small.

When the load changes greatly, the selection of large-capacity transformers has this problem, and the small load makes it heat too much.

Actually, you're saying the opposite. When choosing a transformer, the transformer capacity is determined according to the load of the first grade. Once the transformer is operational, we can only adjust and limit the electrical load according to the capacity of the transformer.

The transformer should be kept running close to full load, when the transformer efficiency is at its highest.

It should be the sum of all loads multiplied by the simultaneous coefficient divided by.

For example: Choose a 35 10kV transformer. Assuming that the maximum load is 3500kw, the power factor is, choose two transformers, capacity s=, you can choose a transformer of 3150kva, and the voltage ratio is 35kv. Then select the model number from the product catalog.

First, select the rated voltage of the tremor transformer. The voltage on the high-voltage side is equal to the voltage of the connected grid, and the voltage on the low-voltage side is 10% or 5% higher than the voltage of the low-voltage grid (depending on the voltage level and impedance voltage of the transformer); Rated capacity selection.

Calculate the size of the load carried by the transformer (the maximum comprehensive load is required to be counted, and the active load kw value is converted to the apparent power kva), if it is two transformers, then the capacity of each transformer can be selected according to 70% of the maximum comprehensive load, and a transformer should be considered according to the total load, and leave an appropriate margin. Other brand-name parameters can be properly considered in combination with transformer products.

1.The "maximum load current" of the transformer refers to the maximum working current that may occur in actual operation, which can refer to the high-voltage side or the low-voltage side.

2.For example, the low-voltage side of a transformer is allowed to be 100A, and the actual maximum current is only 50A, so 50A is the maximum load current.

3.The "rated current" of a transformer refers to the maximum current that is allowed for long-term operation.

4.The high-voltage side and the low-voltage side are also different, as long as the manuscript or transformer rated capacity is divided by the rated voltage (three-phase transformer divided by root number 3) to get the rated current of the phase key.

5.The "maximum load current" of the transformer cannot exceed the "rated current" during normal operation.

6.A certain "overload" is allowed for a short period of time.

Choose 800kVA transformer.

That is, 800 * is your kw number. The best operating state of a transformer is; 65-75% of the rated capacity of the transformer. That's 800*, which is the transformer capacity you want.

You 624kw, not at the same time, you calculate according to the maximum power used at the same time, that is, the duty cycle. x2 is the total load current. Then choose the transformer.

If you choose this power, 624x2=1248a. Check the meter 800kva transformer secondary current, which is completely sufficient.

The load factor of the transformer is most suitable at 65-75% of the rated capacity of the transformer. According to the load capacity selection, the 400kva transformer is kw, and the general load factor runs at 65-75% of the rated capacity of the transformer.

For the selection of comprehensive power transformer capacity such as power supply and lighting, agricultural and sideline product processing, the simultaneous power of electrical equipment should be considered, and the capacity of the transformer can be selected according to the times of the maximum load that may actually occur.

According to the characteristics of scattered users, small load density, seasonal load and strong interstitial characteristics of rural power grids, capacity regulating transformers can be used. The capacity regulating transformer is a kind of transformer that can adjust the capacity without load according to the load size, and it is suitable for use in places where the load has obvious seasonal changes.

The load rate of the transformer used in the factory is about 40% in the first shift, about 70% in the second shift, and 100% in the third shift;

The electricity consumption of urban residents generally reaches about 50%;

about 30% of rural domestic electricity;

The selected transformer is selected according to the maximum operating load, s=p cos =p

The load rate of the transformer is most suitable at 65 to 75% of the rated capacity of the transformer, how to choose the capacity of the transformer? It is selected according to the load capacity, such as 400kva transformer multiply kw, and the general load rate runs at 65-75% of the rated capacity of the transformer. But the simultaneous running coefficient of your load is basically about the same.

Below 1600kva, you can basically choose it like this, but it is too big to calculate.

The long-term load of the transformer should be about 75% of the transformer, because the transformer in this state is the most economical to operate. Moreover, there is a certain capacity space to meet the requirements of temporary overload of the transformer. The capacity selection of the transformer is:

The loads that need to be supplied by the transformer are converted according to different k values (load rate and simultaneous rate) and summarized, which should be about 75% of the transformer capacity. Since different processes have different k-values, and they vary greatly. Therefore, it is necessary to find the appropriate k value in the calculation manual of the process industry to convert the load.

The efficiency of the transformer is very high, especially the efficiency of the large transformer reaches more than 97%, and the capacity of the transformer can be kw or kva, which shows this. The transformer is responsible for about 80 percent of the best, the choice of transformer capacity must pay attention to the nature of the load, the load is larger to reserve 20 percent of the transformer capacity, try to choose a larger transformer!

The transformer generally ensures that the operation of the smart leather load rubber is the most efficient at the rated capacity (). Filial piety is like a difference.

Correct answer)

Summary. Hello dear, happy to answer for you. 30 days per month, power factor presses, then: 6000 30 = 200 (200 (hours)

Knowing that a transformer has a capacity of 50kVA, how can I determine if the transformer is overloaded based on the monthly power supply (kWh)?

Hello friends, I'm glad to answer for you. 30 days per month, 0 for power factor. Raid and 9, then: 6000 30 = 200 (200 (hour)

Hello dear, I'm glad to answer Daming for you. From the above calculation results, it can be concluded that as long as the transformer is used for no less than hours per day and the load is average, the transformer is not overloaded.

Summary. The statistical calculation of the load in the design of the low-voltage power supply and distribution system is an important content, and the load calculation results play a decisive role in the power supply capacity installation, the selection of power supply and distribution equipment and the safe and economical operation. The purpose of the load calculation is to:

Calculate the load current and apparent power of the transformer in the substation as the basis for selecting the transformer capacity. The load current of the main electrical equipment (circuit breaker, disconnector, busbar, fuse, etc.) is used as the basis for selecting the equipment. Calculate the load current flowing through each line (power supply inlet, high and low voltage distribution line, etc.) as the basis for selecting the line cable or wire cross-section.

Pls are you ok.

My question is a defense question for graduation.

The statistical calculation of the load in the design of the low-voltage power supply and distribution system is an important internal megacapacitance, and the load calculation results play a decisive role in the power supply capacity application, the selection of power supply and distribution equipment and the safe and economical operation. The purpose of load calculation is to calculate the load current and apparent power of the transformer in the substation, and use it as the basis for selecting the transformer capacity.

The load current of the main electrical equipment (circuit breaker, disconnector, busbar, fuse, etc.) is used as the basis for selecting the equipment. Calculate the load current flowing through each line (power supply inlet, high and low voltage distribution line, etc.) as the basis for selecting the line cable or wire cross-section. Calculation of peak load, which is used to protect the tuning calculation of electrical appliances and to verify the starting conditions of the motor.

Summary. Extended information: The capacity of the high and low voltage coils of a double-turn transformer is usually the same size, which is equal to the capacity of the transformer nameplate. (The coil capacity on the three sides of the three-turn transformer may be inconsistent).

Based on the capacity of the transformer, the rated current of the coil on one side of the transformer (the maximum current that can work for a long time) is calculated. The calculation method is as follows: because: transformer capacity s = root number 3x line voltage x line current. So: line current = s.

The actual current of the transformer is determined by the load, and the power factor is also determined by the load. As long as the actual current is not greater than the rated current. When the actual current exceeds the rated current, it is called "overload", and the transformer is allowed to be overloaded (see specific regulations).

Calculate the role of the transformer's maximum load current.

Hello, I have seen your question and am sorting out the answer, please wait a while

The maximum load current of the transformer refers to the worst working current that may occur in actual operation. The rated current of the transformer refers to the maximum current allowed for long-term operation, and the maximum load current of the transformer cannot exceed the rated current during normal operation, and the overload with a certain amount of virtual impulse is allowed for a short time.

Extended information: The capacity of the high and low voltage coils of the double-turn transformer is usually the same as the large and the capacity of the transformer nameplate is equal to the capacity of the transformer's nameplate. (The coil capacity on the three sides of the three-turn transformer may be inconsistent).

Based on the capacity of the transformer, the rated current of the coil on one side of the transformer (the maximum current that can work for a long time) is calculated. The calculation is as follows: because:

Transformer capacity s = root number 3x line voltage x line current. So: line current nonsense search = s.

The actual current of the transformer is determined by the load, and the power factor is also determined by the load. As long as the actual current is not greater than the rated current. When the actual current exceeds the rated current, it is called "overload", and the transformer allows the overload to crack (see specific regulations).