It was learned on September 11 that the UHV circuit breaker tubular insulating tie rods developed by China Electric Power Research Institute Co., Ltd. passed all type test project assessments, marking the realization of localized development of UHV circuit breaker tubular insulating tie rods. This is of great significance for the independent control of the entire industry chain of my country’s UHV circuit breakers and for improving the reliability of UHV AC projects.

The insulating tie rod is the insulating component in the gas insulated switchgear (GIS) circuit breaker that transmits operating power and is called the “arm” of the circuit breaker. The UHV GIS circuit breaker has a high voltage level and a large short-circuit breaking capacity. The insulating tie rod must withstand high-strength transmission power, ultra-high speed, and have UHV insulation tolerance, making the insulating tie rod the most difficult to develop among UHV GIS circuit breakers. Insulation parts. The insulating tie rods of UHV GIS circuit breakers are divided into two structural types: tubular type (adapted to four-break circuit breakers) and plate type (adapted to double-break circuit breakers). Among them, the tubular type insulating tie rods have long relied on imports, and the reliability of related products is insufficient.

In order to realize the localization of UHV GIS circuit breaker tubular insulating rods, State Grid Corporation of China has successively established scientific and technological projects since 2018,”Research on Performance and Detection Technology of Insulating Rods for UHV Circuit Breakers” and “Key Technologies for UHV GIS Insulating Rods and Particle Traps” Research”. Both projects are led by China Electric Power Research Institute, with participation from Xidian Group, New Northeast Electric Group, Shanghai Longkun, Shanghai Tengyan and other universities, as well as universities such as Xi’an Jiaotong University and Tianjin University. Researchers have carried out a lot of research on material selection, structural design, process development, performance testing and other aspects of tubular insulating tie rods. They have solved many problems such as insufficient mechanical strength, high defect rate, poor stability, etc., and have the ability to independently develop tubular insulating tie rods. Design and manufacturing capabilities.

The domestically produced insulating tie rod developed by the researchers has a tensile strength of 390 kN, a mechanical life of more than 10,000 times, a power frequency voltage of 1210 kV withstands for 1 minute, an operating impact of ±1800 kV 15 times each, and a lightning impact of ±2400 With 15 times of kilovolts each, it meets the conditions for localized engineering application and is expected to be implemented in engineering demonstration applications in 2024.