Cylindrical Low Voltage Capacitor

In the field of engineering technology for self-healing parallel capacitors, the design of the shell structure is far from being a simple matter of appearance selection; it is a core consideration related to the safety and reliability of the products. When instantaneous high voltage is generated inside the capacitor due to self-healing actions or abnormal operating conditions, the shell will become the first line of defense against internal pressure shock. Ge Yue Electric, through in-depth mechanical analysis and a large number of experiments, discovered that the cylindrical shell of the Cylindrical Low Voltage Capacitor is more structurally advantageous in pressure bearing compared to the square shell of the rectangular low-voltage capacitor.

When a cylindrical shell of a Cylindrical Low Voltage Capacitor is subjected to internal pressure, its stress distribution exhibits a highly uniform characteristic. According to the mechanics principles of thin-walled containers, the cylindrical structure mainly generates circumferential stress and axial stress under the action of internal pressure. These two types of stress can be continuously and uniformly transmitted along the shell, effectively avoiding the stress concentration phenomenon that occurs at the corners of the square-shaped shell. The right-angle connection points of the square-shaped shell will form natural stress concentration points. Under the long-term cyclic pressure action, these areas are prone to generating fatigue cracks. However, the streamlined design of the cylindrical structure enables the uniform distribution of internal pressure over the entire surface of the shell, thereby significantly enhancing the compressive strength and fatigue life of the capacitor. Our test data show that under the same wall thickness conditions, the average bursting pressure of the cylindrical shell is approximately 25% higher than that of the square shell.

During operation, self-healing capacitors experience frequent internal pressure fluctuations. Each self-healing action generates a small amount of gas, causing a transient change in the pressure inside the container. The cylindrical structure of the Cylindrical Low Voltage Capacitor, with its continuous and complete geometric shape, demonstrates more stable mechanical performance compared to the square structure of the rectangular capacitor when dealing with this repetitive pressure impact. Experiments have shown that after undergoing a million simulated self-healing pressure cycle tests, the deformation degree of the cylindrical shell is only one-third that of the rectangular shell. This ability to resist cyclic impact makes cylindrical capacitors particularly suitable for applications in dynamic compensation scenarios where frequent switching is required, providing a solid mechanical guarantee for the long-term stable operation of the reactive power compensation.

Geyue Electric has developed a dedicated deep stamping forming process for the BSMJ(Y) series Cylindrical Low Voltage Capacitors. By using high-strength aluminum alloy materials and special annealing treatment techniques, we ensure that the cylindrical shell can withstand extremely high internal pressure while maintaining a relatively thin wall thickness. Our cylindrical capacitors have undergone strict pressure cycling tests, capable of withstanding over one million standard pressure impacts, which far exceeds the industry standards. At the same time, the cylindrical structure creates conditions for us to optimize the layout of internal components, allowing the dielectric to be wound in a more ideal manner, further enhancing the electrical performance of the capacitors.