State Grid promotes line parallel gap technology

State Grid promotes line parallel gap technology

Article Source: National Grid News Author: [unknown]

On August 19, the State Grid Transportation and Inspection Department received news that the State Grid Corporation of China established a working group composed of the Transportation Inspection Department, the Infrastructure Department, the Safety Supervision Department, the National Dispatching Center, and the China Electric Power Research Institute to accelerate overhead transmission. Popularization and application of line parallel gap technology.

It is reported that the work of the working group will focus on the following aspects: optimizing the technical parameters of the parallel gap, standardizing the specifications and models of the parallel gap, improving the technical guidelines for the parallel gap, clarifying the principle of parallel gap selection, the scope of use, and the installation and acceptance standards; Propose reasonable lightning trip rate indicators for lines with parallel gaps, reasonably adjust the requirements for patrols for lightning faults in parallel gap lines, effectively reduce the workload of line fault patrols; increase the number of parallel gaps pilot application units and lines, and gradually extend the scope of the pilot to all provinces The company’s transmission lines of all voltage levels of 500 kV and below; on the basis of earnestly summarizing the operating experience, gradually carry out the pilot application of infrastructure engineering lines, and strive to realize the full promotion of parallel gap technology in the company’s infrastructure and renovation projects; strengthen the parallel gap of transmission lines Refinement, summary and publicity of the results of technical research and pilot application, promote the continuous and effective development of the parallel gap installation work, and ensure the actual results.

Parallel gap lightning protection technology uses gap devices connected in parallel on both sides of the insulator string to receive lightning, dredge power frequency arcs, and prevent insulators from being burned by arcs, which helps to increase the recombined power of the line and reduce the workload of operation and maintenance. In Europe, It is widely adopted in Japan and other countries and regions. In recent years, with the continuous strengthening of the power grid structure and the large-scale use of sulfur hexafluoride switchgear and microcomputer protection devices, the company has the conditions to promote the application of parallel gap technology. Since 2010, the State Grid Transportation Inspection Department has organized the China Electric Power Research Institute to carry out the application research on the parallel gap technology of 110 kV to 500 kV line insulators, and the 118 lines of the State Grid Beijing, Hebei, Zhejiang Electric Power and other units have a total of 2,540 kilometers. The pilot application of parallel gap technology has been carried out on 35 kV to 500 kV lines, which has the effect of effectively reducing the lightning failure rate, protecting insulators, and reducing the workload of fault inspection.