S11-500/10/0.4 oil-immersed transformer

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The S11-500/10/0.4 oil-immersed transformer is a common three-phase distribution transformer. The following is a detailed introduction to it: The price of the S11-500/10/0.4 oil-immersed transformer is approximately between 17,000 yuan and 60,000 yuan. The following are the specific quotations from some manufacturers:

### Medium and high price range

- **Supply of oil-immersed transformers with low loss and energy saving, S11-M-500kva**: The price is approximately 60,000 yuan. - **S11 type oil-immersed transformer**: The price is approximately 50,000 yuan.

### Basic parameters - **Rated capacity**: 500KVA, indicating that the apparent power that the transformer can transmit is 500 kilovolt-amperes.

- **Rated voltage on the high-voltage side**: 10kV, meaning that the transformer is designed to be connected to a 10-kilovolt high-voltage transmission line.

- **Rated voltage on the low-voltage side**: 0.4kV, that is, the output low voltage is 400 volts, which is suitable for general industrial and civil low-voltage distribution systems.

### Performance characteristics - **Energy-saving and high efficiency**: The S11 series transformers adopt high-quality core and winding materials as well as advanced manufacturing processes. They have relatively low no-load losses and load losses. Compared with traditional transformers, they can significantly save electrical energy and reduce operating costs.

- **Low noise**: By optimizing the structural design of the core and windings and adopting appropriate vibration reduction measures, the noise generated during the operation of the transformer is relatively small, reducing noise pollution to the surrounding environment.

- **Strong short-circuit resistance**: The windings adopt special winding processes and fastening measures, such as using copper foil to wind the low-voltage windings and multi-layer cylindrical high-voltage windings, etc., so that the ampere-turn distribution of the windings is balanced, the mechanical strength is high, and they can withstand relatively large short-circuit current impacts without being easily damaged.

- **Good sealing performance**: The oil tank adopts a corrugated sheet structure or other sealing technologies and has good sealing performance. It can effectively prevent the transformer oil from contacting the outside air, reduce the oxidation and moisture absorption of the oil, extend the service life of the transformer oil, and also reduce the maintenance workload.

### Structural composition - **Core**: It is laminated by silicon steel sheets with high magnetic permeability, providing an efficient magnetic circuit for the transformer to reduce energy losses.

- **Windings**: They include high-voltage windings and low-voltage windings, usually wound with copper or aluminum wires. The high-voltage windings generally have a multi-layer cylindrical structure, and except for small-capacity ones using copper wires, the low-voltage windings often adopt a cylindrical structure wound with copper foil.

- **Oil tank**: It is a sealed metal container used to accommodate the core, windings and insulating oil, playing a role in fixing and protecting the internal structure and also having a heat dissipation function.

- **Insulating oil**: It is filled inside the oil tank and serves as an insulating medium and a cooling medium. It has good insulating properties, can prevent short circuits between the windings and the core, and at the same time dissipates the heat generated during the operation of the transformer through the tank wall and the radiator.

### Working principle Based on the law of electromagnetic induction, when the high-voltage winding is connected to an alternating current power source, the alternating current generated will produce an alternating magnetic flux in the core, and this magnetic flux will induce an alternating electromotive force in the low-voltage winding, thus realizing the transformation of voltage. According to the law of electromagnetic induction, the voltage is proportional to the number of turns of the winding. Therefore, by reasonably designing the turn ratio of the high-voltage winding to the low-voltage winding, the input high-voltage electrical energy can be converted into the required low-voltage electrical energy for output.

Application fields - **Power system**: It is widely used in substations and distribution rooms at all levels, reducing the voltage of the electrical energy transmitted by high-voltage transmission lines and then distributing it to industrial users, commercial users, and residential users, etc.

- **Industrial production**: It provides a stable low-voltage power supply for various industrial equipment, such as motors, lighting equipment, and production lines in factories.

- **Construction field**: It is used in distribution rooms in commercial buildings, residential buildings and other places to supply power to electrical equipment and lighting systems in buildings.

### Maintenance and upkeep - **Daily inspection**: Regularly check the appearance of the transformer, including whether there is oil leakage in the oil tank, whether the oil temperature is normal, whether the oil level is within the normal range, whether the porcelain bushings are clean and undamaged, etc.; listen to whether the sound during the operation of the transformer is normal and whether there are abnormal vibrations and noises.

- **Regular testing**: Regularly conduct electrical performance tests, such as measuring the direct current resistance, insulation resistance, transformation ratio, etc. of the windings to ensure that the performance of the transformer meets the requirements; test the quality of the transformer oil, including indicators such as the breakdown voltage strength, water content, and acid value of the oil, and filter or replace the oil when necessary.

- **Component maintenance**: Regularly inspect and maintain components such as the cooling system, voltage regulation device, and protection device of the transformer to ensure their normal operation; check the sealing performance of the oil tank, and repair any leakage in a timely manner.

### Installation requirements

- **Site selection**: It should be installed in a place that is dry, ventilated, free of corrosive gases and dust, and away from flammable, explosive items and high-temperature heat sources.

- **Foundation construction**: According to the weight and size of the transformer, build a solid concrete foundation to ensure the levelness and stability of the foundation to prevent the transformer from tilting or sinking during operation.

- **Safety distance**: The transformer should maintain a sufficient safety distance from surrounding buildings, walls, and other electrical equipment to meet the requirements for safe operation and maintenance.

- **Grounding system**: Install a complete grounding system to ensure that the shell and neutral point of the transformer are reliably grounded to ensure personal safety and the normal operation of the equipment.

### Common faults and treatment methods

- **Insulation fault**: The insulation performance may decline due to reasons such as aging of insulation materials, moisture absorption, and deterioration of oil quality, resulting in insulation breakdown or short circuit. Treatment methods include replacing damaged insulation components, filtering or replacing the transformer oil, and strengthening insulation monitoring.

- **Winding fault**: Such as winding short circuit, open circuit, inter-turn short circuit, etc., which may be caused by manufacturing process defects, long-term overload operation, being subjected to external force impacts and other reasons. It is necessary to repair or replace the windings and at the same time check whether the relevant protection devices operate normally.

- **Oil leakage**: Poor sealing of the oil tank, rupture of oil pipes and other reasons may lead to oil leakage. Once oil leakage is found, the leakage point should be found and repaired in a timely manner, an appropriate amount of transformer oil should be supplemented, and the oil level and oil quality should be checked.

- **Cooling system fault**: Failure of cooling fans, blockage of radiators and other problems will affect the heat dissipation effect of the transformer, resulting in excessive oil temperature. The faulty components of the cooling system should be checked and repaired in a timely manner to ensure good heat dissipation.