When the transformer is running with load, what is the specific relationship between the change of o

1) When transferring from no-load to load operation, because of the problem of internal resistance voltage division, the output voltage will decrease, and with the increase of running time, the temperature of the transformer will rise, the internal resistance value will increase, and the voltage drop will also increase.

2) The internal resistance voltage drop is RI, and with the increase of load current, the voltage drop increases, which is also related to the size of the output power.

3) Depending on what load you have, if it is an inductive load, capacitive load and other nonlinear loads, its output power may be constant, but the nonlinear load will cause abnormal losses on the secondary side of the transformer, and the internal resistance voltage drop will increase.

It can't be counted that way. First of all, the transformer itself has losses, just like the power supply has internal resistance. You can check the output voltage curve with load.

This is related to the impedance of the transformer. It is normal for the power to be greater than the capacity, because the capacity is the rated value, and if it is operated under overload, it will definitely be greater than the rated value. However, this situation cannot be operated for a long time, otherwise the transformer life will be shortened or even burned out.

First of all, the voltage does not change. That is, if the voltage output of the transformer is 220V, then the voltage on the load is 220VIn the case of transformers, there is no such thing as rated resistance. There is only the talk of capacity. That is, va

If you know the resistance of the load, then you can calculate the power of the load. (v*v r) as long as the calculated power is not greater than the capacity of the transformer.

2: Generally speaking, r is fixed. For example, electric lamps or motors have power ratings. I don't know how this r will change all the time. If the calculated load power is greater than the capacity of the transformer, it will burn the transformer.

The output voltage of the transformer in my factory is abnormal, is the transformer burning or has a reason?

How it works when the transformer load is running:

When an alternating voltage U1 is applied to the primary side of the transformer, and the current flowing through the primary winding is i1, the current will generate alternating magnetic flux in the core.

The primary and secondary windings are electromagnetically linked, and according to the principle of electromagnetic induction, the alternating magnetic flux passes through the two windings to induce an electromotive force.

Its magnitude is proportional to the number of winding turns as well as the maximum value of the main magnetic flux.

The voltage on the side with more winding turns is high, and the voltage on the side with fewer winding turns is low, when the secondary side of the transformer is open.

That is, when the transformer is no-load, the voltage of the primary and secondary terminals is proportional to the number of turns of the primary and secondary windings, that is, u1 u2=n1 n2, but the primary and secondary frequencies are consistent, so as to achieve the change of voltage.

The main parameters of the transformer:

1. Working frequency.

The core loss of the transformer has a great relationship with the frequency, so it should be designed and used according to the frequency used, which is called the working frequency.

2. Rated power.

At the specified frequency and voltage, the transformer can work for a long time without exceeding the output power of the specified temperature rise.

3. Rated voltage.

Refers to the voltage allowed to be applied on the coil of the transformer, which shall not be greater than the specified value when working.

The above content refers to Encyclopedia - Transformers.

The load operation of the transformer refers to the working condition when the primary winding is connected to the power supply voltage and the secondary winding is connected to the leased load. At this time, the secondary side of the transformer also has current flow, and the access circuit of the original transformer increases correspondingly compared with the no-load, and the voltage of the secondary side will change due to the influence of the load.

Operation of normal periodic loads:

Under the rated use conditions, the transformer can operate according to the rated current throughout the year.

Transformers are allowed to periodically exceed the rated current when the average relative aging rate is less than or equal to 1.

When the transformer has serious defects (such as abnormal cooling system, serious oil leakage, local overheating, abnormal analysis results of dissolved gas in oil, etc.) or weak insulation, it is not suitable to run beyond the rated current.

Under normal periodic load operation mode, the allowable load factor k2 and time can be determined according to one of the methods of load guide, when the rated current is over-rated.

Related information.

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.

The voltage of the transformer does not change, and when the load increases, the voltage will accompany the positive ()aIncrease. b.Minish.

c.No change in potato sparrows.

d.Adventitious. Correct answer: No change.

Summary. When a transformer is rated at a voltage with a load to run, when the voltage change rate is greater than zero, what is the nature of the responsible pro, hello, very happy for your problem. The load characteristic is the relationship between the generator voltage and the excitation current when the speed and stator current are rated and the power factor cos= constant, that is, U = curved f(i1).

Dear, if my answer is helpful to you, please give a thumbs up (comment in the lower left corner), look forward to your like, your efforts are very important to me, and your support is also the driving force for my progress. If you feel that my answer is still satisfactory, you can click on my avatar for one-on-one consultation. Finally, I wish you good health and a good mood!

When a transformer is rated at a rated voltage, it runs with a load, and when the voltage change rate is greater than zero, what is the nature of responsibility.

When a transformer is rated at a voltage with a load to run, when the voltage change rate is greater than zero, what is the nature of the responsible pro, hello, very happy for your problem. The load characteristic is the relationship between the generator voltage and the excitation current when the speed and stator current are rated and the power factor cos= constant, that is, the limb is pure U = curve f(i1). Dear, if my answer is helpful to you, please give a thumbs up (comment in the lower left corner), look forward to your like, your efforts are very important to me, and your support is also the driving force for my progress.

If you feel that my answer is still satisfactory, you can click on my avatar for one-on-one consultation. Finally, I wish you good health and a good mood!

That's not what I mean when I ask about the nature of the load, I mean whether the nature of the load is purely resistive or resistive.

Capacitive load. The voltage change rate is related to the load size, the nature of the load, and the short-circuit parameters.

When the load current of the transformer increases, the output of the voltage sock at the round end will collapse ().

a.Rise. b.No change.

c.Decline. d.All three are possible.

Correct Answer: All three scenarios are possible.