110kV oil-immersed transformer is a kind of high-voltage transformer, which is widely used in step-up and step-down conversion in power systems. Compared with other types of transformers, oil-immersed transformers have higher insulation performance and larger capacity, so they are widely used in all aspects of the power system.

First, the working principle

The working principle of the 110kv oil-immersed transformer is similar to that of the S11 series transformer, which is based on the principle of electromagnetic induction. When the primary winding is connected to the AC power supply, the current flows through the winding, generating an alternating magnetic field. This magnetic field causes the secondary winding to induce an electromotive force, which realizes the transformation of the voltage. Due to their high operating voltage, such transformers need to have high insulation properties and voltage strength.

Second, structural characteristics

The 110kV oil-immersed transformer is mainly composed of iron core, winding, oil tank and transformer oil.

Iron core: It is made of silicon steel sheets with high permeability, which has good magnetic permeability, which can reduce magnetic resistance and improve the efficiency of the transformer.

Winding: It is wound by insulated copper wire or aluminum wire and is the circuit part of the transformer. They are placed between the two magnetic pole faces of the iron core, forming the primary and secondary windings of the transformer.

Fuel tank: It is the shell of the transformer, which is used to house the transformer body and other accessories. It has good heat dissipation performance and is able to conduct the heat generated during the operation of the transformer into the air.

Transformer oil: It is a mineral oil with good insulating properties, which is used to fill the space inside the transformer and play the role of insulation and heat dissipation. It can effectively reduce the insulation distance between the windings and improve the electrical performance of the transformer.

In addition, due to their higher operating voltage, 110kV oil-immersed transformers usually have more stringent manufacturing and testing standards to ensure their safety and reliability. For example, in the manufacturing process, more stringent quality inspection and control of silicon steel sheets are required to ensure their magnetic permeability and stability. In the winding manufacturing process, it is necessary to use more high-voltage insulation materials and processes to ensure that it has good insulation properties and compressive strength.

3. Performance parameters

The performance parameters of 110kV oil-immersed transformer mainly include rated capacity, rated voltage, rated current, no-load current, no-load loss and load loss.

Rated capacity: refers to the apparent power that the transformer can output under rated operating conditions. Due to their large capacity, these transformers are often used in the main step-up or step-down conversion link in the power system.

Rated voltage: refers to the rated voltage value of the primary and secondary windings of the transformer under rated operating conditions. Due to its higher operating voltage, it also has higher requirements for ground insulation resistance.

Rated current: refers to the rated current value of the primary and secondary windings of the transformer under the rated operating conditions.

No-load current: refers to the input current value of the transformer under no-load operating conditions. For oil-immersed transformers, the size of the no-load current is also one of the important parameters to measure its performance.

No-load loss: refers to the sum of the core loss and winding loss of the transformer under no-load operating conditions. Due to its long-term operation, the size of the no-load loss directly affects the energy efficiency and operating costs of the transformer.

Load loss: refers to the sum of the core loss and winding loss of the transformer under the rated load operating condition. The magnitude of load loss directly affects the stability and reliability of the transformer.

Fourth, use and maintenance

When using and maintaining a 110kV oil-immersed transformer, the following points should be noted:

Regularly check the operating status of the transformer to ensure that it is working properly; Due to its high operating voltage, more stringent maintenance and management measures are required to ensure its safety and reliability.