EN
low voltage switchgear panel drawable control cabinet
Description
What is a high-voltage switchgear?
High voltage switchgear, also kn own as metal enclosed switchgear, is an important distribution device in the power system. It is mainly used to receive and distribute electrical energy, and can quickly cut off the faulty part in the event of a power system failure, ensuring the normal operation of the fault free part in the power grid.
High voltage cabinets are usually composed of electrical equipment such as circuit breakers, isolating switches, grounding switches, transformers, lightning arresters, etc., which are assembled in a closed metal enclosure. The design of high-voltage cabinets aims to ensure the safe and reliable operation of the power system, prevent power accidents, and protect the safety of operators.
In addition, the high-voltage cabinet is equipped with interlocking devices to ensure the safety of operation. For example, the circuit breaker handcart can only move from the test/isolation position to the working position when the grounding switch is in the open state, and vice versa. This design can effectively prevent misoperation and improve the safety of the power system.
There are many types of high-voltage switchgear, mainly including classification by main wiring form, classification by circuit breaker installation method, classification by cabinet structure and classification by internal insulation medium.
Classification by main wiring form
• Bridge wiring switchgear: Bridge wiring switchgear is suitable for power systems that require frequent operations and can provide flexible power switching.
• Single bus switchgear: Single bus switchgear has a simple structure and is suitable for small power systems or as a backup power supply for large systems.
• Double bus switchgear: Double bus switchgear provides higher power supply reliability and is suitable for large industrial and commercial facilities.
• Single bus segmented switchgear: Single bus segmented switchgear combines the advantages of single bus and double bus, and is suitable for medium-sized power systems.
• Double bus with bypass switchgear: Double bus with bypass switchgear adds bypass function on the basis of double bus, which improves the flexibility and reliability of the system.
• Single bus segmented switchgear with bypass bus: Single bus segmented switchgear with bypass bus is suitable for power systems that require high reliability and flexibility.
Classification by circuit breaker installation method
• Fixed switchgear: The circuit breaker of the fixed switchgear is fixedly installed in the cabinet body, which is suitable for occasions that do not require frequent operation.
• Removable (handcart) switchgear: The circuit breaker of the removable (handcart) switchgear can be moved, which is convenient for maintenance and replacement, and is suitable for occasions that require frequent operation.
Classification by cabinet structure
• Metal-enclosed compartment switchgear: The main electrical components of the metal-enclosed compartment switchgear are installed in separate compartments, but have one or more non-metallic partitions that meet a certain protection level.
• Metal-enclosed armored switchgear: The main components of the metal-enclosed armored switchgear are metal-enclosed equipment installed in grounded compartments separated by metal partitions.
• Metal-enclosed box switchgear: The shell of the metal-enclosed box switchgear is a metal-enclosed switchgear.
• Open switchgear: There is no protection level requirement for the open switchgear, and part of the shell is an open switchgear.
Classification by internal insulating medium
• Air-insulated switchgear: Air-insulated switchgear uses air as the insulating medium and is suitable for general industrial environments.
• SF6 gas insulated switchgear: SF6 gas insulated switchgear uses SF6 gas as the insulating medium and is suitable for occasions requiring higher insulation performance.
