Electrical Enclosure Cabinet: High voltage switchgear, ring main unit, central cabinet

Among the three major majors of mechanical and electrical engineering (water, heating, and electricity), electrical engineering has distinct characteristics. The core equipment of water and heating professions relies heavily on power devices such as water pumps and fans, which achieve the flow of matter and energy through pressure; The five major elements of electrical engineering, including transmission, transformation, distribution, and usage, all rely on various types of Outdoor Electrical Cabinets (which can be called "boxes" according to size and have consistent properties) in practical applications. Especially in the daily production and life of power distribution and consumption engineering, electrical cabinets play a core role, forming a pattern of "no cabinet, no system". Various power supply and distribution cabinets (boxes) form a complex power supply and distribution system, transmitting electrical energy to various end users. It is worth noting that the Outdoor Weatherproof Enclosure Cabinet Box is only illustrated with component combinations or boxes on the drawings, which may have a certain "mystery" to non electrical professionals. However, for electrical professionals, the electrical equipment, components, and circuit structures inside the cabinet are the core, and the cabinet itself mainly plays a role in installation and load-bearing. As a key carrier for the complete and integrated electrical system equipment, the electrical cabinet has been endowed with more connotations with the development of technology. In addition to core components and main circuits, auxiliary components, control circuits, secondary monitoring devices, etc. need to be further configured by the complete cabinet manufacturer to ensure the integrity of the electrical system. Its specialization level continues to improve with the development of technology. Therefore, mastering the names, functions, and characteristics of various complete sets of electrical cabinets is the key to avoiding confusion in use and preventing safety hazards.

High voltage switchgear is a general term in the field of high voltage (medium voltage) power supply and distribution, covering various types of high/medium voltage distribution and breaking equipment, including ring main unit, central cabinet, high voltage incoming cabinet, high voltage outgoing cabinet, etc. Its core commonality is the function of controlling the on/off of high and medium voltage circuits. As an important category of Electrical Enclosure Cabinet, it occupies a core position in the power supply and distribution system. In terms of types, high-voltage switchgear is mainly divided into two categories: fixed and mid mounted. Among them, fixed type (such as GG-1A type) has gradually been replaced by mid mounted metal enclosed switchgear (such as KYN-18 series), which is widely used due to its excellent mechanical performance and safety reliability. The upgrade of such electrical cabinets has also promoted the safety improvement of power supply and distribution systems. According to the Electrical Cupboard structure, high-voltage switchgear can be divided into four categories: metal enclosed interval switchgear (represented by the letter J, such as JYN2- type, with main electrical components packaged in separate compartments, including non-metallic partitions), metal enclosed armored switchgear (represented by the letter K, such as KYN28A type, with core components packaged in grounded metal partition compartments), metal enclosed box type switchgear (represented by the letter X, such as XGN2- type, with a fully metal enclosed shell), and open switchgear (with no clear protection level, with partially open shell, such as GG-1A (F) type). Electrical Cabinet Outdoor with different structures are suitable for different installation scenarios and usage needs. In common scenarios, high-voltage switchgear and ring main unit are often classified as one type, focusing on power distribution functions, while mid mounted cabinets (commonly known as handcart cabinets) focus on load protection. The three types of electrical cabinets have clear division of labor and cooperate to ensure the stable operation of the power supply and distribution system.

Mid mounted switchgear, also known as metal armored mid mounted withdrawable switchgear, belongs to high-voltage distribution equipment. As an important type of high-voltage Electrical Cabinet Assembly, it has a maximum working voltage of 3.6/7.2/12kV and is suitable for indoor complete distribution of three-phase AC 50Hz single busbar segmented or double busbar segmented systems. It is mainly used for power transmission to small and medium-sized generators in power plants, power transmission to secondary substations in power systems, power distribution to factories, enterprises and institutions, and starting of large high-voltage motors. Common models include KYN28, KYN18, KYN61, etc. Its core feature is the adoption of a three-layer structure design: the upper layer is the busbar and instrument room (isolated from each other), the middle layer is the circuit breaker room, and the lower layer is the cable room. It is named after the circuit breaker located in the middle layer, which makes the operation and maintenance of Metal Electrical Cabinet more convenient. The central cabinet is divided into high and low structure and equal height structure. The front height of the high and low structure is 2300mm, and the rear height is 1920mm. The busbar is arranged in a cross shape, and the instrument room is detachable; The height of the structure is consistent before and after, and the busbars are arranged vertically in a straight line. The instrument room is integrated with the cabinet, providing a larger installation space for easy production and operation. The External Electrical Cabinet of the two structures is suitable for different indoor installation space requirements. The significant feature of the current central cabinet is the configuration of a microcomputer protection device, which integrates protection, measurement, monitoring, communication and other functions. It adopts a "modular" design, which can replace conventional relays and measuring instruments, simplify secondary design and construction, save installation space and control cables, and greatly improve the intelligence level of such electrical cabinets.

There is a clear difference between the central cabinet and the commonly known high-voltage switching cabinet and ring main unit cabinet. Although the three belong to the category of high-voltage Locomotive Electrical Cabinet, their application scenarios and functional positioning have their own focuses, and they need to be selected reasonably according to actual needs. This is mainly reflected in five aspects: firstly, the meaning is different. The central cabinet specifically refers to armored movable central metal enclosed switchgear, while the commonly known high-voltage switchgear is a general term for a type of electrical product with an operating voltage of 3.6kV~550kV, used for power system switching, control, and protection. The scope of this type of electrical cabinet is more extensive; Secondly, the fixed method and switch properties are different. The central cabinet is a portable electric meter cabinet with circuit breakers, while the high-voltage switchgear (including ring main unit) is a fixed cabinet with load switches. Electrical cabinets with different fixed methods are suitable for different operation and maintenance needs; Thirdly, the functions are different. The central cabinet focuses on high-voltage load protection, which is used to protect the backend transformer and high-voltage load. The high-voltage switchgear focuses on high-voltage power distribution, dividing one or two high-voltage power sources into multiple outgoing lines. The two types of electrical cabinets complement and work together; The fourth difference is the structure. The central cabinet adopts a three-layer partition structure, and the high-voltage switchgear is mostly connected to the copper busbar through ordinary SF6 load switches to form a system. The structural differences determine the installation and operation of the Electrical Control Cabinet; Fifthly, there are different forms of existence. High voltage switchgear has two forms: air insulated and fully enclosed gas filled cabinets. In addition to dedicated connectors for incoming and outgoing lines, fully enclosed gas filled cabinets are connected to each other in a complete gas chamber filled with SF6 gas. Different forms of electrical cabinets are suitable for different environmental requirements. In summary, although the three types of equipment belong to the category of high-voltage electrical cabinets, their application scenarios and functional positioning have their own focuses, and they need to be selected reasonably based on actual needs.

If you have any selection inquiries, technical questions or procurement needs related to various Electrical Enclosure Cabinets, please feel free to contact us at any time for detailed discussion. We will provide professional electrical cabinet solutions based on your actual scenario to assist in the stable operation of your power supply and distribution system.