AC Contactor for Switching Power Capacitors

In the field of low-voltage reactive power compensation, each switching of power capacitors is accompanied by the generation and extinction of arcs. The traditional AC contactors have a challenging issue that they are difficult to overcome because their arc extinguishing systems often seem inadequate when dealing with capacitive loads. However, the CJ19 series AC Contactors for Switching Power Capacitors have conquered this challenge by means of a series of precise optimizations, transforming this challenge into a stable and reliable guarantee for entire power system. Geyue Electric, as a company deeply involved in global low-voltage power industry, we deeply understand that in the reactive power compensation system, a successful capacitor switching is not only about safely connecting the power capacitors to the power grid, but also about how to gracefully and safely cut off the current and bid farewell to the arcs.

When the AC contactor cuts off a normal resistive load, the current and voltage phases are basically in line, and the arc naturally extinguishes easily when the current crosses zero. However, when the capacitor is switched on or off, a surge current several times or even tens of times the rated current will be generated. During the cutting-off process, due to the inability of the voltage at both ends to change abruptly, there is a phase difference with the grid voltage, making the arc even more intense and difficult to extinguish. The arc extinguishing grids or simple arc extinguishing chambers of traditional contactors are often designed for cutting off conventional inductive or resistive loads. When facing the strong arc generated by the capacitor load, their arc-extinguishing capabilities and spatial layout often cause the arc to reignite, spurt, or even cause the contacts to weld, which not only shortens the contactor's lifespan but also poses a potential threat to the stable operation of the compensation cabinet.

In response to the unique "temperament" of capacitor loads, the arc-extinguishing system of the CJ19 series AC Contactors for Switching Power Capacitors have undergone a comprehensive innovation in terms of materials, structure and principles.

The 1st step of the triple refinement path is structural reinforcement and spatial reconstruction. The CJ19 series AC Contactors for Switching Power Capacitors have significantly enhanced the physical space and arc-blocking capability of the arc extinguishing chamber. The arc extinguishing grid plates are made of a denser and more heat-resistant alloy material, and the geometric shape and spacing of the grid plates have been optimized. The deeper arc extinguishing chamber and the more numerous partition plates design effectively elongate and divide the arc path, causing the elongated arc to be rapidly cut into multiple short arcs. This enables forced cooling and ionization removal within a limited space, which is similar to building multiple levels of speed bumps and cooling pools for the furious arc, allowing its energy to be consumed layer by layer.

The 2nd step of the triple refinement path is precise matching of contact materials. Capacitor switching has extremely strict requirements for the anti-soldering property and electrical lifespan of the contacts. The CJ19 series AC Contactors for Switching Power Capacitors adopt a special formulation of silver-based alloy contact materials, which not only ensures low contact resistance but also significantly enhances their ability to withstand high-rate surge currents and arc erosion. Combined with a special contact shape design, the CJ19 series AC Contactors for Switching Power Capacitors effectively eliminate the probability of metal bridging during disconnection, thereby reducing the risk of continuous arc burning at the source.

The 3rd step of the triple refinement path is collaborative design with switching timing. The core of the CJ19 series AC Contactors for Switching Power Capacitors lies in their switching sequence of "first limiting the resistance, then closing the main contacts". From a mechanical perspective, this design significantly reduces the inrush current during closure, thereby indirectly reducing the arc intensity during opening. The arc suppression system of the CJ19 series AC Contactors for Switching Power Capacitors works in conjunction with this design, ensuring the mechanical linkage and spatial layout of the main contacts and auxiliary current-limiting contacts, and guaranteeing that the arc suppression system of the contactors operates reliably within the designed capacity, even in the event of large current discharge due to abnormal conditions.

A thorough understanding of every technical detail is aimed at achieving 100% reliability. As a leading figure in the Chinese low-voltage reactive power compensation industry, Geyue Electric not only has a deep understanding of core components such as the CJ19 series AC Contactors for Switching Power Capacitors, but also is committed to providing customers with comprehensive solutions from core components to complete systems. Our low-voltage reactive power compensation devices are based on these deeply optimized specialized components, combined with the precise switching strategies of intelligent controllers, ensuring that each compensation system can respond quickly to changes in power factor while achieving the smoothest and safest capacitor switching, effectively extending the overall lifespan of the equipment and reducing the risks of system operation and maintenance. Choosing Geyue is choosing a solid commitment to power quality. We believe that true value lies in making technology invisible, and making stability and efficiency the norm in your power grid operation.