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2024

Understanding the principle of a transformer involves grasping how it transfers electrical energy between two or more circuits through electromagnetic induction. A transformer typically consists of two coils of wire, known as the primary and secondary windings, wrapped around a core made of magnetic material. When an alternating current (AC) flows through the primary winding, it creates a magnetic field that induces a voltage in the secondary winding. The ratio of the number of turns in the primary and secondary windings determines whether the transformer steps up (increases) or steps down (decreases) the voltage. This principle is fundamental in electrical engineering and is widely used in power distribution and various electronic devices.

A transformer is a device that changes alternating current voltage, current, and impedance. When alternating current flows through the primary coil, an alternating magnetic flux is generated in the iron core (or magnetic core), inducing voltage (or current) in the secondary coil.

2024

How to maintain a transformer?

Transformer maintenance is to ensure the normal and safe operation of the transformer after inspection and repair. Power safety and stability require that transformers, whether in operation or out of service, be maintained once a year. Transformers that are about to be put into operation should be checked and maintained beforehand.

2024

Methods for Handling Transformer Failures

The guidelines for handling transformer tripping are as follows: when a transformer trips, stop and check according to the on-site procedures. Analyze the maintenance actions and the phenomena at the time of the incident, assess the situation, and proceed with handling. If both gas protection and differential protection trip simultaneously, do not restore power until the cause is clearly identified and the issue is resolved.

2024

What methods are there for drying transformers?

This method involves placing the device body inside an oil tank, with the outer winding coil connected to the power frequency current, utilizing the heat generated by eddy current losses in the tank wall for drying. At this time, the temperature of the tank wall should not exceed 115-120°C, and the temperature of the device body should not exceed 90-95°C. For the convenience of winding the coil, it is advisable to minimize the number of turns or reduce the current; generally, a current of 150A is selected, and the wire can be of 35-50mm². Multiple asbestos strips can be placed on the tank wall, and the wire is wound around the asbestos strips.

2024

What are the types of transformers?

Classified by cooling method: dry (self-cooled) transformer, oil-immersed (self-cooled) transformer, fluorinated (evaporative cooling) transformer.

2024

Materials of transformers

To wind a transformer, we must have a certain understanding of the materials related to the transformer. Therefore, I will introduce some knowledge in this area.

2024

Losses in transformers

When the primary winding of the transformer is energized, the magnetic flux generated by the coil flows through the core. Since the core itself is also a conductor, an induced electromotive force occurs in the plane perpendicular to the magnetic field lines. This electromotive force forms a closed loop on the cross-section of the core and generates a current, resembling a vortex, hence it is called "eddy current." This "eddy current" increases the losses in the transformer and causes the core of the transformer to heat up, resulting in an increase in temperature.

2024

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