The difference between KYN28 metal-clad switchgear of different qualities

Regarding the temperature rise solution for 2000A, 800mm wide cabinets: reduce self-heating, implement rational ventilation design; 2000A solid-sealed pole column circuit breakers can also use heat sinks; use two 80×10mm busbars made of high-quality busbar material; increase contact pressure and bolt tightening torque.

For 650mm width with lightning impulse withstand voltage: do not assume that 17.5kV 95kV BIL, being a higher voltage level, necessarily requires larger dimensions and wider cabinets. Since 17.5kV is not a standard domestic voltage grade, it is not necessary to follow domestic technical standards strictly—such as the requirement that heat-shrink tubing cannot reduce clearance distances. The power frequency withstand voltage for 17.5kV is 36kV, and international creepage distance requirements are relatively lower, allowing creepage as low as 16mm/kV.

There is no need to worry about operational issues, as overseas switchgear installation requirements, operating environments, and maintenance management are generally stricter than domestic practices. When dealing with international customers, one must be practical and not focus solely on appearance. Instead, focus on meticulously manufacturing high-quality products, ensuring technical parameters are solidly guaranteed. Temperature rise and impulse withstand voltage must be verified through testing, not merely based on experience. New or modified products should not be released without proper testing, relying solely on trial reports that have no proven value.

For the short-circuit closing test of earthing switches, the standard requires internal switchgear cabinet testing. Key factors include closing speed, contact pressure, and contact material. Installation of earthing switches is rarely studied, yet the installation orientation and copper busbar routing significantly affect the closing test performance. It is essential to fully understand the dynamic and thermal stability and the short-circuit closing process to select high-quality switches. Regarding resistance distribution, appropriately increasing the shorting resistor and reducing contact resistance can lower the risk of overheating and welding. The routing of connecting copper busbars determines closing speed and whether electromagnetic forces assist or hinder closure.

For arc-resistant switchgear design, it is crucial to understand the arc release process, ensuring smooth pressure relief channels and easily opened pressure relief covers. Research the weak points of shock wave overpressure on doors, covers, and enclosures, study the thermal effects of sustained arc burning, improve the cabinet's fire resistance, and ensure rapid flame extinction.

High-quality KYN28 switchgear has a clear market positioning, with performance significantly superior to ordinary domestic metal-clad switchgear. Its technical depth, meticulous design, premium materials, comprehensive manufacturing processes, careful assembly, thorough and standardized testing, and focus on serving mid-to-high-end customers contribute to elevating industry standards.