What are HT transformers?

HT transformers are electrical devices that use the principle of electromagnetic induction to change the voltage level of alternating current. They can convert low voltage into high voltage (boost) or reduce high voltage to low voltage (降りる). They are indispensable core components in modern power systems.

The core working principle of HT transformers.

HT transformers are mainly composed of three parts:

1. Iron core: It is usually made of silicon steel sheets stacked and pressed together to form a magnetic pathway.

2. 巻線: Including high-voltage windings and low-voltage windings, which are made of copper or aluminum wires.

3. Insulation system: Oil-immersed or dry insulation to ensure high-voltage safety.

When alternating current passes through the primary winding, it will generate an alternating magnetic field in the iron core, which in turn induces currents of different voltages in the secondary winding, thereby realizing voltage conversion.

The main types and characteristics of HT transformers.

Oil-immersed transformers are the most common type. Including mineral oil as an insulating and cooling medium, they have the characteristics of good heat dissipation and large capacity and are usually used in large substations and power plants and other places that require high-power conversion. Their insulating oil can not only effectively cool the windings but also improve the insulation strength, but it needs to be regularly maintained and checked for oil quality.

Dry transformers do not use liquid coolants but rely on air convection cooling, which has the advantages of good fire prevention performance and is maintenance-free. This type is particularly suitable for installation in commercial buildings, 病院, subways and other places with high fire prevention safety requirements. 同時に, due to its environmental characteristics, it is also increasingly favored by the market.

Amorphous alloy transformers are made of new amorphous alloy materials for the iron core, which have superior magnetic properties compared to traditional silicon steel sheets. Their no-load loss can be reduced by 60-70%, making them the most energy-efficient transformer type. This energy-saving feature makes them play an important role in new energy power generation systems and smart grid construction. Although the initial investment is higher, their long-term operational economy is significant.

The key role of HT transformers.

1. Long-distance power transmission: The voltage of the power plant is raised to 110kV-1000kV, which greatly reduces the line loss.

2. Terminal distribution: Reduce the high voltage to a safe usage voltage, such as 380V/220V.

3. Industrial support: Provide custom voltage for special equipment (such as 600V, 690V, 等).

4. International adaptation: solve the differences in power grid standards between different countries (例えば, converting 480V to 400V).

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