GN24-12/630 high-voltage isolation switch indoor AC 12kV rated current 630A

Description :

  GN24-12/630 high voltage isolation switch is an indoor switchgear used in three-phase AC power systems with a rated voltage of 12kV and a frequency of 50Hz. This equipment is mainly installed in the high-voltage switchgear as an isolation component of the circuit, ensuring that a clear disconnection point is formed during the maintenance or repair of high-voltage lines and equipment, and ensuring the safety of operators. It does not have arc extinguishing capability, so it is strictly prohibited to operate with load. The opening and closing actions must be carried out after the circuit breaker has disconnected the circuit. The GN24-12/630 high-voltage isolation switch has a compact structure and is designed to comply with national standards. It is suitable for various indoor substations, distribution rooms, and distribution systems in industrial and mining enterprises, and is an indispensable basic safety component in the power system.

  The technical parameters of GN24-12/630 high-voltage isolating switch strictly follow the standards of GB 1985 "High voltage AC isolating switch and grounding switch" for manufacturing. Its rated voltage is 12kV, rated current is 630A, rated short-time withstand current (thermal stability current) is usually 20kA or 25kA (depending on the manufacturer's design, common values are taken here), and rated peak withstand current (dynamic stability current) is correspondingly 50kA or 63kA. The equipment uses high-quality copper material as the conductive circuit, and the contact surface is silver plated to reduce contact resistance and prevent oxidation. The insulation material selected is high-performance epoxy resin or ceramic insulator, which has excellent electrical insulation performance and mechanical strength. The overall structural design focuses on heat dissipation and mechanical stability, ensuring low temperature rise and high reliability during long-term operation.

  When selecting GN24-12/630 high-voltage isolation switches, it is necessary to clarify that their applicable scenarios are indoor environments, with ambient temperatures typically between -5 ℃ and+40 ℃ and relative humidity not exceeding 90%. If applied to high-altitude areas (over 1000 meters), insulation strength correction or special customized models should be considered. This model is suitable for isolation units of fixed switchgear (such as KYN28 series) or handcart switchgear. Please note that the GN24 series has a single pole or three pole linkage structure. When selecting, the type of operating mechanism (manual or electric) and installation method (vertical or horizontal) should be confirmed. Unlike load switches, GN24-12/630 high-voltage isolation switches are only used to isolate power sources and cannot be used to cut off load currents or short-circuit currents. Therefore, they must be used in conjunction with circuit breakers in system design, strictly following the operating sequence of "first disconnect the circuit breaker, then pull the isolation switch".

  The installation of GN24-12/630 high-voltage isolation switch should be carried out by professional electricians according to electrical installation specifications, ensuring that the base is firmly fixed, the conductive connection part is in good contact, and conductive paste is applied. In daily maintenance, it is necessary to regularly check the contact condition of the contacts, observe whether there is overheating and discoloration, and check whether there are cracks, dirt, or discharge marks on the surface of the insulators. For the operating mechanism, it is necessary to regularly add lubricating grease to ensure that the opening and closing actions are flexible and free of jamming. In humid or dusty environments, cleaning frequency should be increased to prevent insulation performance degradation caused by pollution flashover. If severe contact erosion or insulator damage is found, the corresponding components should be immediately stopped and replaced to avoid safety accidents. Proper maintenance can significantly extend the service life of GN24-12/630 high-voltage isolation switches and ensure stable operation of the power system.

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