The aluminum capacitor case with slot provides a solid physical protection barrier for internal capacitor components. High-voltage transmission lines are widely distributed, and the environment they are in is complex and changeable. They may encounter severe weather such as strong winds, heavy rains, and hail, and may also be affected by unexpected situations such as bird strikes and falling foreign objects. The aluminum material itself has high strength and hardness, which can effectively resist external mechanical impact. The design of the slot structure further enhances the overall rigidity of the shell, making it less likely to deform when subjected to external forces. This physical protection can prevent the capacitor components from internal structural damage and electrode breakage due to external mechanical damage, prevent the capacitor components from failing, and ensure the continuity and stability of power transmission. In strong wind weather, the aluminum slotted shell can firmly support the internal capacitor components so that they will not be damaged by violent shaking; when encountering hail attacks, the high strength characteristics of the shell can effectively disperse the impact of hail and protect the capacitor components from damage.​

The excellent heat dissipation performance of the aluminum slotted capacitor shell is a key factor in ensuring the stable operation of capacitor elements in high voltage and high current working environments. In high-voltage transmission lines, capacitors are in high voltage and high current working conditions for a long time, and capacitor elements will continue to generate heat. If this heat cannot be dissipated in time, the internal temperature of the capacitor will continue to rise, accelerate the insulation aging of the capacitor elements, reduce the stability of the capacitance value, and even cause capacitor failure. Aluminum has good thermal conductivity and can quickly transfer the heat generated by the capacitor elements to the surface of the shell. The design of the slotted structure greatly increases the contact area between the shell and the air, forming a more efficient heat dissipation channel. Air can flow between the slots, take away the heat on the surface of the shell, speed up the heat dissipation rate, and keep the internal temperature of the capacitor within a reasonable range. This heat dissipation mechanism effectively slows down the aging rate of the capacitor elements, prolongs the service life of the capacitor, and ensures its long-term stable operation in high-voltage transmission lines. ​
The corrosion resistance of the aluminum slotted capacitor shell also provides a strong guarantee for its reliable operation in high-voltage transmission lines. High-voltage transmission lines are usually erected in the air and exposed to outdoor environments for a long time, and must withstand the erosion of substances such as rain, wind and sand, and chemical gases. A dense aluminum oxide film will quickly form on the surface of aluminum in the air. This film has excellent chemical stability and can effectively prevent aluminum from further oxidation and corrosion. Even in humid and rainy areas, or in environments with more chemical gases such as industrial pollution areas, the aluminum slotted shell can resist external erosion with this protective film, avoiding the corrosion and perforation of the shell, which will cause the internal components of the capacitor to be damp and damaged. The corrosion resistance not only improves the safety of the capacitor, but also reduces the maintenance frequency and cost, ensuring the long-term stable operation of the high-voltage transmission line. ​
The aluminum slotted capacitor shell can also play a good role in fixing the internal capacitor components and fillers in terms of structural design. During the operation of the high-voltage transmission line, the capacitor will be subjected to various vibrations and shocks. If the internal components are not firmly fixed, they are prone to displacement or damage. The slotted structure can accurately position the capacitor components, so that they maintain a stable position inside the shell, and also help the fillers to be evenly distributed around the capacitor components. The evenly distributed fillers can better play the role of insulation, heat dissipation and buffering, further improving the overall performance and reliability of the capacitor. During transportation and installation, the fixing effect of the aluminum slotted shell can also ensure that the capacitor components are not damaged and the capacitor can be put into use smoothly. ​
The aluminum slotted capacitor shell also has good electromagnetic shielding performance. In high-voltage transmission lines, there is a complex electromagnetic environment, and strong electromagnetic fields may interfere with the capacitor components inside the capacitor, affecting its normal operation. Aluminum, as a metal material, can shield the electromagnetic field, and the reasonable design of the slotted structure further optimizes the electromagnetic shielding effect. The aluminum slotted shell can effectively prevent the interference of external electromagnetic fields on the capacitor components, ensure that the capacitor components work in a stable electromagnetic environment, improve the electrical performance stability of the capacitor and the accuracy of signal transmission, and provide protection for the safe and reliable operation of high-voltage transmission lines.