There are three core technologies of medium voltage switch, including arc extinguishing technology, architecture and insulation mode. As far as the insulation method is concerned, the solid insulation and full shielding technology is a revolutionary and innovative insulation technology and a new trend in the development of switch technology. Li Mingxin, an expert of Xi'an High Voltage Switchgear Research Institute, said. In arc extinguishing technology, vacuum arc extinguishing has great advantages, especially in the medium voltage field, which cannot be replaced by vacuum arc extinguishing technology. As far as architecture is concerned, architecture and insulation mode are the overall technical trends that should be related to each other. You can't just look at insulation or architecture.
In the long run, due to the highly mature arc extinguishing technology, the removable architecture technology mode will gradually disappear in the next ten or twenty years, because the removable switch cabinet is designed for easy maintenance. From the development point of view, the switches in the future will be highly reliable and do not need maintenance. Therefore, the removable architecture will develop towards the fixed architecture. In addition, with the improvement of switch compactness and reliability requirements, the insulation method will achieve breakthrough through technical innovation. At present, there are several insulation methods, such as air insulation, composite insulation and sulfur hexafluoride gas insulation. These insulation technologies have their own limitations.
The emerging solid insulation is a better technical solution to solve the insulation problem, but it is not the only solution. It has limitations and advantages. The limitation is that the solid insulation uses epoxy resin, which is a by-product of petroleum. We can't get rid of this material. What really tests the solid insulation technology is how to use epoxy resin more accurately. This is an important choice in the application of terminal power distribution and terminal power grid automation.