China's domestically produced largest converter transformer was successfully developed
These 14 products are the 750kV and ±400kV (±200kV) voltage-class converter transformers on the grid side of China West Power. They are also the largest converter transformers in China. The performance indicators meet or exceed national standards. The requirements of the technical agreement and the technical level have reached the international leading level, which has promoted the technological upgrading and leap-forward development of the domestic DC equipment manufacturing, and realized the localized mass production of the converter transformer. The construction of Jiuquan-Hunan ±800 kV UHV DC transmission project aims to further meet the needs of the rapid development of the development of Jiuquan Wind Power Base and the power consumption of Hunan, and promote the large-scale development of clean energy, optimize the development pattern of coal, and optimize the resources. It is of great significance to transform into an economic advantage, promote a low-carbon economy, and implement a national energy strategy.  As the domestic 750kV voltage class transformer production, the largest number, the most experienced operating experience, as early as 2012, China Xidian completed the development of 750kV outlet device, which laid a good practical foundation for the implementation of the project. At the same time, China Xidian has provided converter transformers for many national key projects, leading the development of China's AC and DC power transmission and transformation equipment manufacturing. Marble pattern steel, also known as marbled steel, refers to a type of steel that has a distinct pattern resembling the natural veins and swirls found in marble stone. This effect is achieved through various metalworking techniques, such as pattern welding, acid etching, and surface manipulation. Below are some common techniques used to create marble pattern steel: ppgi marble coils,prepainted marble steel,steel marble sheet,prepainted marble coated galvanized ppgi Wuxi Shengshu Metal Co., Ltd. , https://www.wuxissmetal.com
Recently, China Xidian successfully developed 7 ±400kV converter transformers and 7 ±200kV converter transformers for Jiuquan-Hunan ±800kV UHV DC transmission project.
1. **Pattern Welding**: This technique involves layering and forge welding multiple sheets of steel together. The layers are then folded, twisted, and hammered repeatedly to create intricate patterns. The final product is a strong yet visually appealing steel with a marbled appearance.
2. **Acid Etching**: Acid etching is a process in which a chemical solution is applied to the steel's surface to selectively remove material and create a pattern. The steel is typically coated with a protective layer, such as wax or masking tape, and the desired pattern is then drawn or marked onto the surface. The acid solution is applied and reacts with the exposed metal, creating the marbled pattern as it dissolves the steel in a controlled manner.
3. **Surface Manipulation**: In this technique, the steel's surface is physically altered to create the appearance of a marbled pattern. This can be achieved through methods such as engraving, hammering, or grinding. Once the desired pattern is created, the steel can be further enhanced by applying patina or other surface treatments to accentuate the pattern's appearance.
Marble pattern steel is often used for decorative purposes, such as in the creation of custom knives, swords, and other metalwork items. It is also popular in the field of architecture and interior design, where it can be used as a unique and eye-catching material for various applications.