Development of ring network cabinetAddtime：2015/8/24 

 {! MiDian}     distribution network in our country began to implement the transformation of urban and rural power grid since 1998, with pressure directly into the center, the city network ring network power supply, thus promoting the rapid development of China's ring network cabinet. The last century 80's has launched a ring network cabinet, Chinese ring network cabinet development so far, but after a few decades, the detailed description is as follows:
   {M! The insulation of iDian}   ring network cabinet has experienced the process of air insulation, air and SF6 gas mixture insulation, SF6 gas insulation, and finally to the solid insulation.
1. air insulated switchgear. The ring network cabinet with air of the main insulation, main switch using gas, compressed air or vacuum load switch, load switch with side mounted and dress and operating mechanism of front mounted. Air insulated ring network cabinet volume is relatively large, the main switch, such as the use of vacuum load switch, the design of the load switch must be coupled with a separate switch.
2. air mixed with SF6 gas insulated switchgear. SF6 load switch is generally used in the main switch of the product, which is placed in the fully sealed epoxy resin or stainless steel case, and the SF6 gas is used as an insulating medium and an arc extinguishing medium.
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