In recent years, with the continuous development of "smart grid and green grid" construction, the promotion of environmental protection gas cabinet without SF6 has been a trend that is in line with the concept of environmental protection and is expected to be good. The State Grid has included the SF6 free environmental gas cabinet in the new technology catalogue and the demonstration application material catalogue. The solid insulated ring network cabinet is changed from the required catalogue to the recommended catalogue. According to the analysis of the situation, no SF6 environmental gas cabinet will be a directional product to replace the SF6 ring network cabinet and solid cabinet. The future market has a broad prospect. There are about 10 enterprises in China to participate in the co construction unit of the "non SF6 gas insulated equipment" working group, which is led by the Chinese Academy of electrical Sciences, and jointly push the product to promote and apply the product.  Medium voltage distribution network equipment is also developing towards green environmental protection and distribution automation.

The ring net cabinet which is widely used in the medium voltage distribution network is mainly used in the SF6 of six sulfur fluoride gas. As the arc extinguishing and insulating medium, it can not meet the requirements of economic and social energy saving and environmental protection. In 2015, "the new technology catalogue of the national Power Grid Corp" included "no or less SF6 gas metal closed switch equipment"; "distribution network demonstration application material catalogue" also added "no SF6 gas loop net cabinet" products. In medium voltage switchgear, the use of environmental protection gas instead of SF6 gas has become an inevitable trend in the development of environmental protection gas ring network cabinet.

Some enterprises started the R & D project of environmental protection gas ring network cabinet in early 2015, and then successfully developed a new environmental protection gas cabinet. The new product adopts the main loop completely closed dry air box structure, the protection grade can reach IP67, no SF6 gas, green environmental protection, and can completely avoid condensation, pollution and other adverse factors that lead to insulation failure. The switch operation mechanism can be equipped with a spring operating mechanism or a permanent magnetic operation mechanism, and has strong adaptability and high reliability. The ring network cabinet can be equipped with DTU automation terminal to meet the needs of distribution automation.

The result of the test report shows that the environmental gas cabinet is green, safe and reliable; without gas treatment equipment, the whole life cycle cost of the equipment is low, and the maintenance amount is small; it meets the standardization, generalization, serialization requirements, flexible combination and convenient splicing, realizing product standard modularization, small volume, small area and saving area. Use the land. In accordance with the requirements of the state for environmental protection, green grid and intelligent power grid, all parameters can meet the standard requirements of the national network and reach the leading level in the country, and the performance indexes of the environmental gas ring net cabinet are fully met the relevant standards. Excellent data and results fully demonstrate the popularity of the green gas cabinet. The development of the ring network cabinet has achieved a new breakthrough and starting point. With the performance advantage being known, it will have a very good development.

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Environmental gas cabinet is a key distribution equipment suitable for distribution network automation. This equipment uses dry air insulation, vacuum arc extinguishing, and does not use materials that affect the environment. It needs to recycle gas and has no harm to the environment. It belongs to the whole life cycle ring protection equipment for production and operation. After the discussion and analysis of the environmental gas cabinet at the national technical appraisal meeting, the meeting was organized by the China Mechanical Industry Federation, from more than 20 experts from the Chinese Academy of electric science and the Xi'an high voltage electrical research institute. The project was completed by the joint research and design of the Colin electric and other units. At the meeting, the expert committee experts carefully listened to the prototype development and on-site inspection report, inspected the test conditions, reviewed the type test reports and technical documents, and finally agreed that the information of the project identification was complete, and it was in conformity with the national and electric power industry standards, and the type test report index reached the standard requirements. Objective the comprehensive technical performance has reached the international advanced level and has passed the national appraisal.