What are the factors that affect the iron consumption of transformers

When the current flows through the transformer windings, it is due to the winding resistance that heats up.

The resulting loss should be that the winding is made of copper, so it is called "copper loss", also known as "copper loss" The magnetic flux in the transformer.

It flows on the core, which has magnetic resistance to the magnetic flux, just like the conductor resists the current, and also generates heat, which is a "hysteresis loss".

Because the core itself is also a conductor, perpendicular to the magnetic field lines.

The electric potential is induced on the plane of the core, and this electric potential is in the cross-section of the core.

A closed loop is formed and an electric current is generated, as if a vortex is called a "vortex". This "eddy current" increases the loss of the transformer and increases the temperature rise of the transformer with heating in the core. The loss caused by "eddy currents" is called "eddy current loss".

We use an induction cooker.

It is the eddy current loss caused by the formation of eddy currents in the iron (steel) container by using a certain frequency of magnetic field.

Consume heat. Both hysteresis loss and eddy current loss are generated with the transformer core, which is called "iron loss" or "iron loss".

There are many factors that affect the iron consumption of a transformer:

From the design aspect, the main ones are: 1Selection of the magnitude of the magnetic flux density in the core.

2.Selection of silicon steel sheet grade of iron core material.

The weight of the core.

4.Selection of the joint form of silicon steel sheet.

From the manufacturing aspect, the main ones are:1Whether the silicon steel sheets are stacked neatly and tightly.

2.The size of the burr of the silicon steel sheet shear.

3. Whether the transformer is neat when the secondary insert is neat when it is assembled.

4.The core is clamped tightly.

5.Whether the paint film of the silicon steel sheet is damaged.

All of the above factors affect the core loss of the transformer.

The losses of transformers include no-load loss PO, short-circuit loss PK and stray loss PS. No-load loss, also known as transformer iron loss, refers to the occurrence in the transformer core lamination, when the periodically changing magnetic field lines pass through the material, caused by the hysteresis and eddy current of the material, and its size is related to the operating voltage and tap voltage.

Short-circuit losses are based on a specified pair of windings. It is caused by the resistance of the transformer windings and is generated by the load current passing through the windings. Stray losses are losses that occur on leads and housings, as well as other structural metal parts, and are load-related.

The no-load loss and short-circuit loss of the transformer account for the vast majority of the transformer loss.

There are two types of losses in transformers, iron loss and copper loss.

Iron loss is caused by excitation, reducing iron loss can appropriately reduce the magnetic flux density, and use materials with high permeability, small hysteresis and high resistivity as the iron core.

Copper loss is the loss caused by the resistance of the coil, which can reduce the current density appropriately, and the copper loss can be reduced by winding with materials with low resistivity and appropriately increasing the wire diameter.

Iron loss is a constant value and is a constant loss, while copper loss is a variable loss.

Transformer copper loss is the power dissipated on the resistance of the primary and secondary windings when the current passes through the primary and secondary windings, and the copper loss is also called variable loss because the PCU is related to I2. As long as the current of the primary and secondary windings is constant, the measured copper loss is the constant loss. An important indicator in transformer design is to minimize or within the allowable range of power losses in the transformer.

Transformers, generators, and electric motors all have iron loss. When the supply voltage is constant, the iron loss is a constant value, independent of the load nature and the magnitude of the current. The loss of the transformer is mainly divided into copper loss and iron loss.

Summary. Hello, dear.

The loss of transformer iron is used to measure the core loss of the transformer, which has nothing to do with the load, but only the size of the transformer's core, materials and grid voltage. Under the condition that the core size, magnetic material properties and grid voltage of each transformer are determined, the value of iron loss is proportional to the square of the voltage. The wiring diagram of the principle is shown in the figure on the right.

The single-phase electric energy meter core can be modified, and two sets of voltage coils are wound on the voltage core, one of which is a coil N1 with a thin wire diameter and many turns, and the lead wires at both ends are connected to the power supply voltage; The outer group is a coil N2 with a thick wire diameter and a small number of turns, and the two ends of N2 are connected and closed with the current coil N3, so that the current in the current coil N3 is proportional to the power supply voltage, and has a fixed phase angle difference with the power supply voltage, and the speed of the turntable is proportional to the voltage U2. The constant of the iron loss table is the number of revolutions (volt·h) [r (v·h)]. The permanent magnet can adjust the iron loss meter constant to a predetermined value, and calculate the number of revolutions of the turntable through the recorder, and the iron loss amount proportional to the iron loss of the measured transformer can be obtained.

The iron consumption of the transformer is proportional to the square of the voltage + why.

Hello, the loss of the iron of the pro-transformer is used to measure the core loss of the transformer, which has nothing to do with the load, but only the size of the core of the transformer, the material, and the grid voltage. Under the condition that the core size, magnetic material properties and grid voltage of each transformer are determined, the value of iron loss is proportional to the square of the voltage. The wiring diagram of the principle is shown in the figure on the right.

The single-phase electric energy meter core can be modified, and two sets of voltage coils are wound on the voltage core, one of which is a coil N1 with a thin wire diameter and many turns, and the lead wires at both ends are connected to the power supply voltage; The outer group is a coil N2 with a thick wire diameter and less turns, and the two ends of N2 are connected and closed with the current coil N3, so that the current in the current coil N3 is proportional to the power supply voltage, and the power supply voltage is a fixed phase angle difference, and the speed of the turntable is proportional to the voltage U2. The constant of the iron loss table is the number of revolutions (volt·h) [r (v·h)]. The permanent magnet can adjust the iron loss meter constant to a predetermined value, and calculate the number of revolutions of the turntable through the recorder, and the iron loss amount proportional to the iron loss of the measured transformer can be obtained.

Ok thanks.

There are many factors that affect the iron consumption of a transformer:

From the design aspect, the main ones are: 1Selection of the magnitude of the magnetic flux density in the iron core 2Selection of silicon steel sheet grade of iron core material.

3.The weight of the core.

4.Selection of the joint form of silicon steel sheet.

From the manufacturing aspect, the main ones are:1Whether the silicon steel sheets are stacked neatly and tightly2The size of the burr of the silicon steel sheet shear.

3. Whether the transformer is neat when the secondary insert is neat when it is assembled.

4.The core is clamped tightly.

5.Whether the paint film of the silicon steel sheet is damaged.

All of the above factors affect the core loss of the transformer.

Due to the small current of the transformer at no load, the loss of the resistance flowing through the coil is negligible, and the main loss at this time is the hysteresis loss of the eddy current of the iron core, so the no-load loss can be regarded as the loss of the iron core.

Because when the transformer is no-load, there is no load current, and the loss at this time is almost all iron consumption, so the no-load loss of the --- transformer can be approximated as iron consumption.

First of all, look at the concept of no-load loss: when one winding of the transformer applies the rated voltage at the rated frequency, and the other windings are open, the active power absorbed by the transformer is called no-load loss.

Therefore, the no-load loss should include the hysteresis and eddy current loss in the core and the resistance loss of the no-load current on the winding applied to the rated voltage. Because the no-load current is very small, the resulting loss can be omitted, therefore, the no-load loss is basically the core loss, commonly known as iron loss.