The environmental protection gas cabinet is also a new thing in the industry. Its development has certain foresight. At this stage, it has not been widely applied, and is still in the research stage. First of all, from the design, material and manufacturing process should be reconsidered, not only a certain theoretical argument, but also a certain experimental basis; secondly, the maintenance must have a complete set of guidelines and relevant regulations support; finally, comprehensive consideration of volume, structure, maintenance, safety and environmental adaptability.

The guarantee of the breaking ability:

Because the insulation capacity of environmental gas is different, the effect of insulation is different, the electric field distribution and safety distance of the conductor are changed, so the insulation of the switch equipment should be optimized again. It is a fundamental problem to improve the insulation performance of environmental gas, and the research of the new insulating gas is also one aspect. At the same time, the optimization of the joint insulation of solid and environmental gas can also be studied.  The breaking capacity of the load switch unit in the loop network cabinet, such as the use of no or low SF6 gas, will be affected. The use of vacuum interrupters to enhance breaking capacity is a mature alternative. However, it is difficult to accept the vacuum interrupter as an isolating fracture, because the vacuum fracture has the possibility of NSDD under the action of high voltage. The cold welding phenomenon of the vacuum contact can also lead to the drop of the impact level, which directly threatens the safety of the person. Therefore, the existing vacuum load switch needs to match the three station isolation or grounding switch, but the cost is high and the product size is large.

The study of temperature rise and heat dissipation:

The restriction of the gas flow in the sealed box leads to the difficulty of convection heat dissipation of the heating conductor, which is a common technical problem of the gas enclosed switchgear. The use of composite materials to increase radiant heat absorption and external heat exchanger to strengthen heat exchange is currently used. Some units are also studying and trying to use heat pipe heat dissipation, using new materials such as liquid metal to reduce the conductor lap surface. The way of contacting resistance to enhance heat conduction is a relatively new technical side. Under the condition that the insulation distance is satisfied by the industry, the industry can increase the natural heat dissipation channel, the heat transfer device such as the pipe, and control the temperature rise directly with the refrigeration equipment for the current situation of large current and high calorific value.

Selection and recovery of mixed gas:

The use of mixed gas in the operation and maintenance strategy and implementation details of the switchgear with mixed gas is significantly affected by the mixed gas. In order to solve this problem, the supplier first requires a clear verification basis based on performance and long-term reliability. Based on these two types of verification, the operation and maintenance strategy of the product can be formulated, and then the implementation requirements of gas assessment, replenishment, replacement and recovery can be formed. Secondly, in the process of product design, we should consider the cost of using and operation and maintenance, and the positioning of product performance. Now that we need to use green gas cabinets, we must resolutely avoid SF6, even a small amount of mixing, which is a transitional means. By means of electric field analysis, the insulation measures can be increased without mixing gas.

Development prospects analysis:

Compared with the solid insulated ring cabinet, the environmental protection gas cabinet has more simple and mature production process in the manufacturing process, which makes the process less affected, the insulation can be restored, the loss of the material is less, the rated current is large and can be recycled; it is not restricted by the atmospheric conditions, and is especially suitable for the pollution and wet environment, it is a maintenance free product. After nearly ten years of development, from the design and manufacture of products to the accumulation of operation experience, great progress has been made, and the customers and the market have received good praise and favor. The next development is also very good.