Important Knowledge Of Three Phase Distribution Transformer
In the process of power transmission, transformation and distribution, the three phase distribution transformer is an important electrical equipment. Transformers can be seen everywhere in industrial enterprises, shopping malls, office buildings, and residential quarters. The role of transformers in the power industry is extremely important.
The principle of three phase distribution transformer
A transformer is a device that uses the principle of electromagnetic induction to change AC voltage and current. The main components are the primary coil, the secondary coil and the iron core (magnetic core).
What are the functions of three phase distribution transformers?
Transforming voltage: increasing or decreasing the voltage, the generator goes through the process of boosting, transmitting, and reducing the voltage to convert the voltage into a voltage level for residential or industrial use.
Changing current: changing the voltage while changing the magnitude of the current
Isolation: The user system and the power supply system are isolated to reduce the scope of the accident.
What types of three phase distribution transformers are there?
Oil-immersed transformer: a transformer that uses transformer oil as the insulating medium and cooling medium, and the iron core and coil are all immersed in the insulating oil.
Dry-type transformer: The iron core and coil are cast with epoxy resin material for insulation.
Amorphous alloy transformer: Amorphous alloy material is used as insulating medium, which has good temperature resistance.
What are the components of a three phase distribution transformer?
Main body: including iron core, winding, insulating support
Voltage regulating device: namely tap changer (on-load voltage regulating device and non-excitation voltage regulating)
Fuel tank and fin-shaped radiator, bushing
Safety devices: moisture absorbers, gas relays, oil filters and temperature measuring instruments, etc.
Transformer oil
Insulation effect: Transformer oil has strong insulating properties, which can generate insulating strength between the winding and the casing.
Heat dissipation: The transformer oil circulates naturally between the body and the fin-shaped radiator according to the principle of heating up, and the heat is dissipated through the radiator to keep the temperature of the coil from being too high.
Arc suppression function: When the on-load voltage regulator is operated, arc light will be generated when the tap changer is opened, and the transformer oil can extinguish the arc light and play a protective role.
What are the losses in the three phase distribution transformer during operation?
Transformer losses include: no-load loss (iron loss): loss caused by iron core eddy current,
Load Loss (Copper Loss): Losses due to resistance heating of the windings.
