The composite insulation cross arm is widely used in the distribution network, which can effectively reduce the lightning strike trip rate of the distribution overhead line, and at the same time, it has obvious effects in preventing pollution flashover, bird damage and foreign objects. However, in recent years, due to raw material defects, poor manufacturing process control and aging problems, the operation failures of composite products have emerged one after another, which has also brought a huge threat to the long-term reliable operation of composite insulation crossarms. In 2019, State Grid Corporation of China started the standardized design of composite insulation crossarms. China Electric Power Research Institute focused on the research and demonstration work on standardized structure design, key performance index improvement and grid access detection plan preparation, and took the lead in the preparation of the enterprise standard "Technical Specifications for Composite Insulation Cross Arms for 10kV Distribution Lines". Test items such as Fourier infrared test and thermogravimetric analysis of key raw materials.
This network access test is based on the enterprise standard of "Technical Specifications for Composite Insulation Cross Arms for 10kV Distribution Lines" as the technical specification, and adopts the mode of "on-site inspection + network access professional inspection", especially by carrying out Fourier infrared test, thermal weight loss analysis, etc. Experiments and analysis of the formulation components of the raw materials used by the suppliers further control the product quality.
In the next step, China Electric Power Research Institute will gradually establish a raw material database of composite insulating cross-arm products by analyzing the formula components of raw materials used by suppliers, and provide original formula data for the performance evaluation of composite insulating cross-arms after operation, and support the standardization construction of distribution network. .