Self-healing Shunt Capacitor

In modern power systems, Self-healing Shunt Capacitors, due to their outstanding reliability and long service life, have become the preferred passive compensation equipment in the field of low-voltage reactive power compensation. As the core component of this type of capacitor, the metallized polypropylene film achieves an astonishing self-repairing function through its unique material and structure. This article will systematically explain the working principle of this intelligent material and help users deeply understand its technical advantages.

The physical basis for the self-healing function of the metallized polypropylene film lies in its unique material properties and precise structural design. Polypropylene, a high-molecular polymer, has a highly symmetrical molecular structure and excellent dielectric properties, which can maintain stable insulation characteristics under external strong electric field influence. The Self-healing Shunt Capacitor of Geyue Electric uses ultra-pure polypropylene base film with extremely low dielectric loss factor, the unique molecular arrangement of which can effectively suppress the occurrence of local discharge. Our material laboratory continuously monitors the crystallinity and purity indicators of the base film using precise instruments. These strict quality control measures make 100% sure that all dielectric materials have uniform electrical properties.

The nanoscale metal electrode layer formed on the surface of the polypropylene base film is a key element for the self-healing function of the Self-healing Shunt Capacitor. Geyue Electric uses a high vacuum evaporation process to uniformly deposit zinc-aluminum composite metal on the surface of the polypropylene base film under specific pressure and temperature conditions. Our engineering team is capable of precisely controlling the thickness of the "nanoscale metal electrodes" covering the surface of the polypropylene film, maintaining it within the range of 0.02 to 0.05 micrometers. The thickness within this range ensures that the "nanoscale metal electrodes" have excellent conductivity and enable them to evaporate rapidly under the action of discharge energy. This specially designed zinc-aluminum composite metal layer presents a regular island-like distribution structure at the microscopic level, and its unique geometric shape creates ideal conditions for the vaporization and isolation of the metal electrode.

When a local area of the dielectric of a Self-healing Shunt Capacitor undergoes instantaneous breakdown, the self-healing mechanism will automatically activate and complete the repair within microseconds. The accumulated discharge energy around the breakdown point causes the metal electrodes in that area to instantly reach the vaporization temperature. This intense physical change process completely removes the metal layer around the defect point. The stepped resistance technology adopted by Geyue Electric can effectively control the scale of energy released during the self-healing process, ensuring that each self-healing action forms an insulating isolation zone with a diameter of only several tens of micrometers. Our experimental data show that the impact of a single successful self-healing process on the overall capacity of the capacitor is typically less than 0.05%. Such a negligible parameter change will not affect the normal operation of the equipment at all.

The design of the cross-sectional structure of the metallized polypropylene film plays a decisive role in the reliability of the self-healing system of the entire Self-healing Shunt Capacitor. The special isolation grid technology developed by Geyue Electric successfully limits the self-healing process to the smallest local area by presetting a large number of tiny insulating boundaries on the film surface. Our BSMJ series capacitors adopt a thickened edge design, which not only significantly enhances the current-carrying capacity of the electrodes but also provides a safe energy dissipation channel for the self-healing process. This carefully optimized structural design enables the capacitor to maintain stable electrical performance after undergoing multiple self-healing cycles.

The fully automated vacuum evaporation production line that Geyue Electric has invested in for construction has achieved precise control over various parameters of the metalized films for Self-healing Shunt Capacitors. Our process engineers can prepare metalized films with ideal resistance values by adjusting the gas composition and pressure parameters in the vacuum chamber. The high-precision online detection system equipped on the production line will monitor the evaporation uniformity of each roll of film in real time. These complete production data will be permanently saved for quality traceability. The automatic winding equipment we use can precisely stack the metalized films and insulating dielectric films together to form capacitor cores with a compact structure and stable electrical performance.

The comprehensive quality verification system established by Geyue Electric safeguards that the metallization films of each batch of Self-healing Shunt Capacitors meet the requirements for long-term operation. Our laboratory conducts destructive self-healing tests on the metallization film samples on a regular basis. By statistically analyzing the number of self-healing points per unit area, we can scientifically evaluate the quality of the films. In addition, our accelerated aging test platform can accurately simulate the long-term operating conditions of the capacitors in high-temperature and high-humidity environments. These valuable test data provide important basis for our research team to continuously improve the products.

Through the systematic technical explanation, our company can clearly understand that the metallized polypropylene film, with its unique material properties and precise structural design, has achieved the self-repairing function of Self-healing Shunt Capacitors during operation. Geyue Electric, as a professional manufacturer of low-voltage reactive power compensation equipment, has always been committed to applying the most advanced material technology and manufacturing processes to product innovation. We sincerely recommend to you the BSMJ series three-phase Self-healing Shunt Capacitors manufactured with high-quality metallized polypropylene film. This product embodies our years of technical accumulation and manufacturing experience and will surely provide a reliable reactive power compensation solution for your power system.