As a key device for ensuring safe, stable transmission and distribution of electric energy in the power system, the core insulation technology principle and reliability guarantee mechanism of the fully insulated gas-filled load switch cabinet are the cornerstones for ensuring the normal operation of the equipment. Its core insulation technology is mainly based on the combination of gas insulation and solid insulation. Among them, gas insulation usually uses gases such as sulfur hexafluoride (SF6) or dry air as insulating media. These gases have excellent insulation properties and arc extinguishing capabilities, and can effectively prevent current leakage and arc formation in high voltage environments; solid insulation uses materials such as epoxy resin to wrap and isolate live parts to prevent the influence of external environmental factors on insulation performance.
From the perspective of insulation technology principles, the working principle of gas insulation is based on the high ionization energy and electron adsorption characteristics of gas molecules. Taking SF6 gas as an example, its molecular structure is stable and its electron affinity is strong. It can quickly capture free electrons and inhibit the gas discharge process. When electrons collide with SF6 molecules, SF6 molecules will adsorb electrons to form negative ions. These negative ions have a large mass and slow movement speed, making it difficult to cause collision ionization, thereby effectively preventing the formation of gas conductive channels and achieving high insulation performance. Solid insulating materials such as epoxy resin, with their good electrical insulation performance, mechanical strength and chemical stability, can provide reliable physical isolation for live parts under complex electrical and mechanical stresses, preventing impurities such as moisture and dust from invading and affecting the insulation effect.
In terms of reliability assurance, the sealing design of the equipment is of utmost importance. The fully insulated gas-filled load switch cabinet adopts a metal shell with excellent sealing performance, and ensures the sealing of the gas through welding, flange connection and other processes. At the same time, it is equipped with a high-precision gas density monitoring device to monitor the internal gas pressure and density in real time. Once a gas leak occurs, the system will immediately issue an alarm to remind the operation and maintenance personnel to handle it to avoid the reduction of insulation performance due to the drop in gas pressure. In addition, the design of the sealing structure can effectively resist the erosion of the internal insulation parts by the harsh external environment, such as moisture, salt spray, sand and dust, etc., to ensure that the equipment can maintain stable insulation performance under different climatic conditions.
The quality control of insulating materials is also a key link to ensure reliability. During the production process, the solid insulating materials are strictly tested and screened to ensure that their electrical, mechanical and chemical properties meet the standard requirements. In the manufacturing process of epoxy resin, the raw material formula, curing process and other parameters are strictly controlled to ensure that it has a uniform structure and stable performance after curing. For gas insulation medium, gas quality detection is carried out regularly to ensure that the gas purity and moisture content are within the specified range to prevent gas impurities from affecting the insulation performance and arc extinguishing effect.
The manufacturing process of the equipment also has a profound impact on reliability. Precision manufacturing technology can reduce defects and bubbles inside the insulation components and reduce the risk of partial discharge. In the production process, advanced processes such as vacuum casting and automated welding are used to ensure the molding quality of solid insulation components and the sealing performance of the metal shell. At the same time, the equipment is strictly tested before leaving the factory, including insulation withstand voltage test, partial discharge test, mechanical operation test, etc. Only products that pass all tests can be put on the market, ensuring the reliability of the equipment from the source.
In the operation and maintenance stage, formulating a scientific and reasonable maintenance plan is an important means to ensure reliability. Regularly inspect the equipment, check key parameters such as gas density and insulation resistance, and promptly identify and deal with potential problems. Conduct preventive tests on the equipment, and use technical means such as partial discharge detection and infrared temperature measurement to diagnose insulation defects and potential faults in the equipment in advance to prevent them from happening. In addition, establish equipment operation files to record the equipment's operating status, maintenance history and other information to provide data support for equipment status assessment and life prediction.
With the continuous advancement of science and technology, the application of intelligent technology has provided a new way to ensure the reliability of fully insulated gas-filled load switch cabinets. By installing intelligent sensors, real-time monitoring and data collection of the equipment's operating status can be achieved, and big data analysis and artificial intelligence technology can be used to evaluate and predict the insulation performance of the equipment, detect potential equipment failures in advance, and achieve precise operation and maintenance. Intelligent technology can also optimize the equipment's operation process, reduce the wear of insulation components caused by frequent operation, and further improve the reliability and service life of the equipment.
