After using a new type of environmental protection gas, such as dry air or N2, the insulation property of the SF6 gas is 1/3 because the insulation performance is lower than SF6, especially N2. It needs to restudy the insulation of the switch equipment and the insulation performance of the equipment and complete equipment depends on the dielectric and electrode and potential distribution of the insulation. After the insulating medium is changed, the insulation of the equipment must be redesigned and verified. It is equal to the environmentally friendly gas insulated ring network unit or other products using the new insulating medium. In view of the optimization of the new environmental protection type gas insulated ring network unit, the most meaningful content of its new insulating medium is environmental protection.

(1) first of all, environmental protection should be brought into full play on the basis of ensuring insulation performance, including product usage process and production process.

(2) next is not to pursue product miniaturization too much, and to carry out product design under the premise of ensuring insulation safety.

(3) finally, it is possible to consider the new product layout structure and try insulation optimization design.

The environmental protection type gas insulated ring net cabinet is the upgrading and replacement of the SF6 ring net cabinet. In the process of popularization, it is recommended to avoid the shortage of the original SF6 cabinet.

1. cancel the combined electric cabinet scheme, because its fuse is closed in the insulation cylinder, the heat dissipation is poor, the fuse needs to be used, and the fuse has the characteristics of safety and dispersion, it has a certain influence on the use of the solid cabinet, so it can be replaced by the circuit breaker cabinet; at the same time, because the cost is basically equal, it is encouraged to adopt The circuit breaker replaces the load switch, so the loop network loop is adjusted to the branch loop when the circuit is reformed, and it is put into protection. It can not only simplify the classification of the products, but also be more flexible.

2. a new type of environmental gas is used to dry air or N2, because the insulation performance is lower than SF6, especially N2, its insulation performance is only 1/3 of SF6 gas, so it is necessary to restudy the insulation of the switch equipment. In order to ensure insulation strength, research should be strengthened in leak detection, gas filling and welding technology. Automatic leak detection and inflatable equipment and robot welding equipment can be used. The electric field should also be optimized to make the field intensity as uniform as possible and reduce the components of the electric field, just like metal shielding.

3. environmental protection type gas insulated ring network cabinet is still a new thing in the industry, its development has a certain prospect; at the present stage, it has not been widely used, 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, the comprehensive consideration of volume, structure, maintenance, safety and environmental adaptability.

4. in addition to the problems of ensuring the insulation strength and the optimization of the electric field, it is also necessary to consider how to keep the shape and manufacturing cost of the SF6 gas insulated product basically the same as the insulating medium of the switching equipment, and the same problem as the basic class of the user interface and the operation mode of the SF6 gas insulated product.

5. because the insulation ability 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.