How does the oil immersed distribution transformer ensure the safety of power transmission with its good insulation performance?
Publish Time: 2024-11-26
In the power transmission system, the oil immersed distribution transformer ensures the safety of power transmission with its good insulation performance, which is mainly achieved through the following aspects:
1. The role of insulating oil
The oil immersed distribution transformer uses insulating oil as the main insulating medium. The insulating oil has the following key functions:
High dielectric strength: The insulating oil has a high dielectric strength and can effectively isolate the high-voltage winding and the low-voltage winding to prevent arcing and short circuits. The high dielectric strength of the insulating oil ensures the safe operation of the transformer under high voltage.
Heat dissipation and cooling: The insulating oil also has good thermal conductivity, which can absorb and dissipate the heat generated inside the transformer, ensuring that the transformer operates within the normal operating temperature range, thereby extending the life of the equipment and avoiding insulation failure caused by overheating.
2. Optimization of insulation structure
The insulation structure of the oil immersed distribution transformer has been carefully designed and optimized to ensure good insulation performance under various working conditions:
Winding insulation: The winding is wrapped with multiple layers of insulating paper to form a continuous insulation layer in the insulating oil. Multi-layer insulation paper provides additional insulation strength and mechanical support to prevent deformation and insulation failure of the winding during long-term operation.
Insulation sleeve: The high and low voltage lead wires of the transformer are led out through the insulation sleeve. The insulation sleeve is made of high dielectric strength material to ensure that there is sufficient insulation distance between the lead wire and the external environment to prevent discharge and arc.
Insulation spacer: Insulation spacers are set between the windings and between the windings and the core to increase the insulation distance and prevent local discharge and insulation breakdown caused by electric field concentration.
Sealing structure: The transformer adopts a fully sealed structure to prevent external moisture, dust and other pollutants from entering the transformer, maintaining the purity and insulation performance of the insulating oil.
Moisture-proof treatment: The internal insulation material has been treated with moisture-proof treatment to maintain stable insulation performance in a humid environment. At the same time, the moisture absorption performance of the insulating oil is low, which can resist the invasion of external moisture to a certain extent.
4. Regular maintenance and testing
In order to ensure that the oil immersed distribution transformer maintains good insulation performance for a long time, regular maintenance and testing are essential:
Oil quality testing: Regularly test the insulating oil, including indicators such as dielectric strength, moisture content, acid value, etc., promptly discover and deal with oil quality deterioration problems, and maintain the good condition of the insulating oil.
Insulation test: Regularly conduct insulation performance tests such as insulation resistance and dielectric loss factor to evaluate the insulation status of the transformer, discover potential insulation defects and repair them in time.
Temperature monitoring: Real-time monitoring of the operating temperature of the transformer to ensure that it operates within the normal temperature range and prevent insulation aging and failure caused by overheating.
5. Design and manufacturing process
The design and manufacturing process of the oil immersed distribution transformer are also key factors to ensure its good insulation performance:
High-quality materials: Use high-purity, low-moisture content insulating oil and high-quality insulating materials to ensure that the transformer can maintain stable insulation performance under various environments.
Strict process: During the manufacturing process, strictly control the process parameters to ensure that the thickness and uniformity of the insulation layer of each component meet the design requirements and prevent insulation failure due to manufacturing defects.
The oil immersed distribution transformer ensures the safe operation of the power transmission system through the role of insulating oil, optimization of insulation structure, sealing and moisture-proof design, regular maintenance and inspection, and high-quality design and manufacturing processes. These measures not only improve the insulation performance and reliability of the transformer, but also reduce the risk of failure during power transmission, ensuring the stability and safety of the power system.
