Working Principle Of Dry-type Transformer

The working principle of Dry Type Transformer is basically the same as that of oil-immersed transformers, both of which are based on the principle of electromagnetic induction. The following is a detailed description of the working principle of dry-type transformers:

Electromagnetic induction: When alternating current passes through the primary coil (primary side) of the transformer, an alternating magnetic field is generated in the iron core. This alternating magnetic field is transmitted to the secondary coil (secondary side) through the iron core, thereby inducing an electromotive force in the secondary coil.

Voltage conversion: According to Faraday's law of electromagnetic induction, the induced electromotive force in the secondary coil is proportional to the ratio of the number of turns of the primary coil and the secondary coil. If the number of turns of the secondary coil is more than that of the primary coil, the voltage of the secondary coil will be higher than that of the primary coil, and vice versa.

Energy transfer: Ideally, the input power of the transformer is equal to the output power. Due to the change in voltage, the current will also change accordingly to maintain the balance of power. For example, if the voltage increases, the current will decrease, and vice versa.

Cooling method: The main difference between dry-type transformers and oil-immersed transformers is the cooling method. Dry-type transformers do not use oil as a cooling medium, but rely on natural air convection or forced air cooling to dissipate heat. Therefore, dry-type transformers usually have better fire resistance and environmental protection characteristics.

Insulation material: The coils of dry-type transformers usually use high-strength insulation materials such as epoxy resin or Nomex paper to ensure safe operation under high voltage.

Application scenario: Since dry-type transformers do not use oil, they are particularly suitable for places with high fire protection requirements, such as high-rise buildings, subways, hospitals and commercial centers.

In summary, dry-type transformers achieve voltage conversion through electromagnetic induction, use air cooling and high-quality insulation materials to ensure safe operation, and are widely used in places that require high safety and environmental protection performance.