What are the no load losses and load losses of transformers?

1. No-load loss The no-load loss of the transformer is that the transformer is open at the output end, and the rated voltage is added to the input end.

The loss of the transformer itself is equal to the no-load current multiplied by the rated voltage multiplied by the power factor.

Because the transformer at this time is in the no-load state, the power factor is very small, generally around, so the no-load loss of the transformer is more than the apparent power.

Much smaller. As long as the core temperature is normal in the no-load state, the noise is qualified, and the specific reason is that the core quality problem and the design problem, the same design because the quality of the core is different, and the no-load current is also different. The poor quality of the core can be solved by increasing the number of turns, that is, reducing the magnetic density, but the load loss will increase when the number of turns of the coil increases, and the overall loss of the transformer increases.

2. Load loss Load loss is the rated current.

load losses at the lower and participating temperatures. The output of the transformer is short-circuited, the input voltage is gradually increased until the rated current is operated for a period of time, and the sum of the measured transformer loss and no-load loss is the load loss when the transformer temperature reaches the participating temperature (B class 100, F class 120, H level 145) and the current is adjusted to the rated current. The measured loss is the input voltage multiplied by the rated current multiplied by the power factor, and the power factor here is generally larger, probably around the left, and the voltage cannot be directly multiplied by the current.

The above loss test is a single phase, if it is three phases, it needs to be multiplied by <>

No-load loss: When the secondary winding of the transformer is open, and the rated voltage of the rated frequency sine waveform is applied to the primary winding, the active power consumed is called no-load loss. Load loss:

When the secondary winding of the transformer is short-circuited (steady-state), the active power consumed when the rated current is flowed through the primary winding is called the load loss. Impedance voltage: When the secondary winding of the transformer is short-circuited (steady-state), the voltage applied by the rated current of the primary winding is called the impedance voltage U.

No-load loss = no-load loss process coefficient Unit loss Core weight, load loss = resistance loss of the largest pair of windings + additional loss. Transformer: 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 are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulation (magnetic saturation transformer), etc. According to the use, it can be divided into:

Power transformers and special transformers (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.). Circuit symbols often start with t. Example:

T01, T201, etc. Load loss = resistance loss of the largest pair of windings + additional loss. Additional loss = eddy current loss of winding + circulation loss of parallel winding wire + stray loss + lead loss.

Impedance voltage: When the secondary winding of the transformer is short-circuited (steady-state), the voltage applied by the rated current of the primary winding is called the impedance voltage uz. Generally, uz is expressed as a percentage of the rated voltage, that is, uz=(uz u1n)*100%.

1. The transformer loss is roughly two: iron loss and line loss. Among them, the iron loss is mainly caused by the hysteresis loss of the transformer core during operation, and its size is greatly related to the voltage, and the transformer has little influence on the iron loss with no load or load. 2. The load current flows through the transformer coil, due to the resistance of the coil itself, there will be a part of the power loss in the ** circle, this part of the loss is "line loss", the larger the current, the greater the loss, so the greater the load, the greater the line loss; 3. When there is no load, only the excitation current flows through the transformer, so the line loss is very small; 4. The sum of the above-mentioned "iron loss" and "line loss" is most of the loss of the transformer, and the sum of the line loss and the iron loss at load is the load loss of the transformer, and the meaning of no-load loss is also the same.

The transformer is lossy when running at no load.

No-load operation of transformer refers to the open circuit of the secondary winding of the transformer, and the rated voltage of the sine waveform of the rated frequency applied to the primary winding.

the operational status of the company;

The no-load loss of the transformer refers to the active power consumed by the transformer during no-load operation.

The no-load loss of the transformer accounts for about the rated capacity.

and decreases as the transformer capacity increases.

Definition of no-load loss of transformer:

When the rated frequency of the rated voltage.

Apply to the terminal of one of the windings of the transformer.

The active power drawn when the other windings are open.

No-load loss refers to the active power consumed when the secondary winding of the transformer is open, and the rated voltage chain of the rated frequency sine waveform is applied to the primary winding.

No-load loss is constant loss. It has nothing to do with the current passing through, but with the voltage that the element is subjected to. There are many factors that affect the no-load performance of transformers, such as silicon steel sheets.

Material properties, processing technology and equipment, the structure of Tiewang Youxin, etc.

The eddy current loss caused by the main magnetic flux in the structural components and the dielectric loss of the transformer, etc., the additional loss is difficult to calculate accurately or accurately, so it is also called the core loss, the town group is referred to as the iron loss, the core loss includes the basic iron loss and the additional iron loss, the basic iron loss includes the hysteresis loss PN and the eddy current loss PB, the hysteresis loss is due to the magnetic domain in the iron core under the action of the alternating magnetic field, do periodic rotation to cause the core to heat, and its pure size is determined by the hysteresis loop. Eddy current loss is caused by the heat loss caused by the induced current generated in the core, and its magnitude is inversely proportional to the resistance of the core, and the additional iron loss PS includes the local eddy current loss caused by the insulation part between the core laminations, which is generally 15%-20% of the basic iron loss, and the no-load loss of the transformer is the loss generated when the excitation current in the core causes the change of magnetic flux cycle under the condition that the transformer is connected to the rated voltage.

When the transformer is supplied with the rated voltage once or twice, and the other side is open, the loss and operation resistance is called no-load loss. It is divided into two types: active (resistive) loss and reactive (magnetic) loss.

The algorithm is as follows: no-load loss = no-load loss process coefficient unit loss core weight.

Load loss: When the secondary winding of the transformer is short-circuited (steady state), the rated current of the primary winding is flowed.

The active power consumed is called load loss. The algorithm is as follows:

Load loss = resistance loss of the largest pair of windings + additional loss.

Additional loss = eddy current loss of winding + circulation loss of parallel winding wire + stray loss + lead loss.

Impedance voltage: When the secondary winding of the transformer is short-circuited (steady-state), the voltage applied by the rated current of the primary winding is called the impedance voltage uz, which is usually uz to the rated voltage.

, i.e., uz=(uz u1n)*100%.

I'll come to this question:

Inside the transformer there is something called winding resistance, which is made up of an iron core and copper wire. After the transformer is powered off, even if there is no electrical load access, the iron core itself is a conductor, and it will generate current to cause the transformer to heat up and produce loss, which is the no-load loss, also known as "iron loss". After the transformer is connected to the load, the current will also consume a certain amount of power when it passes through the copper wire wound on the iron core, which is the load loss, also known as "copper loss".

Hope we are helpful to you.

What is the main no-load loss of transformer? How does it affect the operation of the transformer? Let's take a look at the question.

First of all, it is important to understand what transformer no-load losses are. No-load loss refers to the active power consumed by the transformer when working without load, mainly iron loss and eddy current loss. It is a form of total loss of transformer and is usually characterized by high temperature rise and noise.

Secondly, no-load losses have a great impact on the operation of the transformer. No-load losses can cause the temperature rise of the transformer, which in turn affects the life and performance of the transformer. High temperatures can cause the insulation material to age, reduce the insulation performance, and even lead to insulation breakdown.

Therefore, it is very necessary to reasonably control the no-load loss of the transformer.

Finally, it is necessary for power system operators to understand and control transformer no-load losses. Because the transformer is an indispensable equipment in the power system, it has an important impact on the power supply capacity and power quality of the power system. Through scientific and effective management and control of transformer no-load loss, the efficiency of transformer use can be improved, its service life can be prolonged, and the safe and stable operation of power supply of the power grid can be better guaranteed.

In short, transformer no-load losses play a very important role in the manufacture, operation and maintenance of transformers. Understanding and controlling the no-load loss of the transformer is the basis for ensuring the safe and stable operation of the power system, and it is also the responsibility of the power system operation management personnel.

The algorithm is as follows: no-load loss = no-load loss process coefficient unit loss core weight.

Load loss: When the secondary winding of the transformer is short-circuited (steady-state), the active power consumed when the rated current is flowed through the primary winding is called load loss. The algorithm is as follows:

Load loss detection loss = resistance loss of the largest pair of windings + additional loss.

Additional loss = eddy current loss of winding + circulation loss of parallel winding wire + stray loss + lead loss.

Impedance voltage: When the secondary winding of the transformer is short-circuited (steady-state), the voltage applied by the rated current of the primary winding is called the impedance voltage uz, which is usually expressed as a percentage of the rated voltage, that is, uz=(uz u1n)*100%.