China's ring network cabinet development process:

The insulation of the ring cabinet has undergone air insulation, air and SF6 gas mixed insulation, SF6 gas insulation, and finally to the process of solid insulation.

Air insulated ring network cabinet. This ring network cabinet to the main air insulation, the main switch with gas, pressure or vacuum load switch, load switch with side mounted and installed, the operation of the front side of the installation. Air insulation ring network cabinet larger, the main switch such as the use of vacuum load switch, the design of the load switch before the need to add a disconnector.

 Air and SF6 gas mixed insulation ring network cabinet. The product main switch is generally selected SF6 load switch, designed to be placed in a fully sealed epoxy resin or stainless steel shell, filled with low pressure SF6 gas as an insulating medium and arc medium.

Other high-voltage live parts such as a busbar, a connecting cable, voltage / current transformer and arrester installed in the air. Air and SF6 gas mixed insulation ring network cabinet with excellent electrical performance, switch cabinet volume than the same type of air insulation ring network cabinet much smaller, can achieve three stations. Switchgear function is complete, convenient combination and easy to achieve distribution network automation.

SF6 gas insulated ring network cabinet. The product will be high-voltage live conductor (three-position switch and connecting bus, etc.) all sealed in the low pressure SF6 gas stainless steel shell, SF6 gas as insulation and arc medium. Stainless steel shell strength, corrosion resistance, good heat dissipation and reliable grounding, to ensure personal safety. For ease of maintenance and replacement, the operating mechanism with high voltage current limiting fuses is installed in the air. The ring network cabinet also uses pre-made silicone rubber insulated cable terminal to achieve cable plug, reducing the volume, improve the ease of installation and maintenance of security.

Solid insulated ring network cabinet. About around 2007, domestic enterprises took the lead in the introduction of solid insulation ring network cabinet. The ring counter eliminates the application of the pressure vessel. The internal insulation and the arc of the switch body adopts the vacuum medium. The external insulation adopts the insulating cylinder curing switch part, and the circuit is connected by the enclosed bus. Insulation tube with solid-sealed pole technology, the vacuum interrupter, the main conductive circuit and insulation support, such as organic integration as a whole, to achieve full insulation, fully sealed and maintenance-free structure.

The insulating cylinder is made of epoxy resin and the bus is encapsulated with silicone rubber. This structure due to the isolation of air, water, dust and hot and cold gas source, effectively slow down the corrosion of the power body.

Solid insulation ring network cabinet advantages:

Environmental protection: solid insulation ring network cabinet to cancel the sulfur hexafluoride gas and the corresponding gas box components, the use of insulation sleeve curing switch components, closed by the bus to connect the various circuits, the whole to achieve full insulation, to reduce the sulfur hexafluoride emissions The technical means.

Safety: solid insulation ring network cabinet will vacuum interrupter, the main conductive circuit, insulation support and other organic combination as a whole, to achieve full insulation, sealed, maintenance-free structure. Phase completely isolated, with explosion-proof performance.

Intelligent: can be added to the scene voltage transformer, modular operation mechanism, can be directly in the operation of the scene to achieve manual upgrade to the power switch, load switch instantaneous break, really meet the distribution network automation requirements. Flexible: solid insulation ring network cabinet to meet the IP67 protection level requirements on the basis of unit assembly, unit replacement, program exchange, greatly reducing the operating costs, in the intelligent upgrade, internal monitoring, anti-harsh environment (cold, Coastal, strong sand, underground, etc.) have obvious technical advantages.