The SZ11 – 25000/115/16.5 transformer purchased by Polish users

The SZ11 - 25000/115/16.5 transformer is an oil - immersed on - load tap - changing power transformer. Here are some relevant information:

1. **Meaning of basic parameters**:

- "SZ11": This is the model of the transformer. S represents three - phase, Z represents on - load tap - changing, and 11 is the design serial number, representing the design version or technical series of the product.

- "25000": It refers to the rated capacity of the transformer being 25,000 kilovolt - amperes (kVA), that is, the apparent power that the transformer can output stably for a long time under specified operating conditions.

- "115": It indicates that the rated voltage on the high - voltage side of the transformer is 115 kilovolts (kV), which is the voltage level of the high - voltage terminal where the transformer is connected to the power system.

- "16.5": It represents that the rated voltage on the low - voltage side of the transformer is 16.5 kilovolts.

2. **Performance characteristics**:

- **Good electrical conductivity**: It usually adopts all - copper coils, which have good electrical conductivity and thermal conductivity, small resistance, can improve the efficiency of the transformer, and reduce energy loss.

- **Flexible voltage regulation**: The on - load tap - changing structure can automatically adjust the output voltage of the transformer according to the changes of the power grid load, ensure the stability of the power supply quality of the power grid, and meet the voltage requirements of different electrical equipment.

- **High reliability**: The internal DC system is adopted, without the need for an external DC power supply, simplifying the installation and maintenance steps, and at the same time increasing the reliability and safety of the transformer.

- **Excellent insulation performance**: It uses selected high - quality oil materials, which have good insulation performance and high - temperature resistance, and can ensure the safe operation of the transformer in harsh environments such as high temperatures.

- **Volume and noise**: Through the optimization of professional design and production processes, it has advantages such as small volume, light weight, and low noise, and is suitable for various scenarios such as substations, industrial and mining enterprises, and urban power distribution.

3. **Market situation**: This large - scale transformer is widely used in power systems and plays an important role in power transmission and distribution. There are many transformer manufacturers in the market that can produce this model of transformer. Its price is affected by factors such as raw materials, production processes, and brands, and generally, the price is relatively high. For the Polish users' purchase of this transformer, relevant international standards and specifications need to be followed in the links such as transportation, installation, and commissioning, and the differences in power system parameters such as voltage and frequency between different countries need to be considered to ensure the normal operation of the transformer. At the same time, attention also needs to be paid to the after - sales service and technical support of the transformer so that problems can be solved in a timely manner during use.