The "ring network cabinet" refers to a switchgear (outlet switch cabinet) set up for each distribution branch. The busbar of this switchgear is part of the toroidal trunk, meaning the toroidal trunk is composed of the busbars from each outlet cabinet. Each outlet cabinet is referred to as a "ring network cabinet." In reality, taking a single ring network cabinet out of context does not fully capture the concept of a "ring network."
Mature power technologies have shown great vitality in the 21st century. Emerging technologies such as renewable energy, smart grids, UHV (Ultra High Voltage), and transportation electrification have become key focuses of the global technological revolution and are central to competition in emerging strategic industries.
China has seized a rare historical opportunity, rapidly growing into the world's second-largest economy and the largest energy producer and consumer. Its power production and consumption ranks are first globally. During this process, China's power technology innovation has made significant progress, especially in UHV transmission technology led by the State Grid Corporation. This breakthrough has reversed the long-standing situation where China's power industry followed Western developments, achieving "China-made" and "China-leading" advancements.
In recent years, several new technologies and products have emerged in China’s power sector, including “Made in China†and “China Leads.†Solid ring network cabinets are a typical example. At the turn of the century, international companies like Toshiba developed high-performance epoxy resin and efficient casting technology, leading to solid insulated switchgear. However, it was only later that these systems began to see wider application.
In February 2005, the Kyoto Protocol came into effect, marking the first time greenhouse gas emissions were regulated globally. This created a large development space for environmentally friendly alternatives to SF6 ring network cabinets. Chinese enterprises, such as Shuangjie Electric, started developing solid ring network cabinets. In 2007, the first domestically produced solid insulated ring network cabinet passed type testing and entered the market. By 2010, 30 sets of solid ring network cabinets were deployed in Tibet’s power supply bureaus, which operate at altitudes over 4,000 meters. These cabinets solved issues related to SF6 gas expansion at high altitudes, leakage, and low-temperature liquefaction that affected insulation and arc-extinguishing performance. They also provided eco-friendly solutions by eliminating SF6.
In August 2011, the State Grid Corporation released its first series of key technologies for new technology promotion, with solid insulated ring network cabinets among the 34 key technologies. It emphasized stricter technical reliability and environmental protection standards. Looking ahead, solid ring network cabinets are expected to gradually replace SF6 gas-insulated ones.
In June 2013, the National Energy Administration issued a plan for the development of power industry standards for 12kV solid insulated ring network cabinets. To ensure the accuracy and objectivity of the standard, experts conducted on-site research with grid users and major suppliers. They organized the "Solid Insulation Ring Network Cabinet Production Application and Market Research Report," revealing positive user attitudes in regions like Xinjiang, Qinghai, Inner Mongolia, Shanxi, and Guangdong, where solid insulated ring network cabinets are often preferred when no better options exist.
Experts highlight that solid ring network cabinets represent a key direction for environmentally friendly switchgear. To promote their adoption, it is essential to address deep-seated technical challenges, ensure product quality through reliable materials and advanced technology, and prevent price-based competition. Both supply and demand sides must collaborate to build smart, eco-friendly distribution networks with emerging core products.
Compared to SF6 or air-insulated ring network cabinets, solid insulated ones offer clear advantages: compact design, maintenance-free operation, and environmental friendliness. Their technology is continuously maturing, representing the future direction of China’s medium-voltage ring network cabinets. In practical applications, they have proven reliable and valuable, positioning them as an important power equipment product in the medium-voltage segment.
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