Research on improving the interconnection capabilities of metropolitan power grids based on cable remaining life assessment
Intelligent evaluation and capacity expansion of cables extend life, improve efficiency, and save energy and reduce emissions.
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Applicable industry
Applications
Key innovations
For the first time, multiple parameters accurately evaluate cable life to improve prediction accuracy; innovative capacity expansion technology achieves operation beyond the design capacity, greatly saving resources and reducing pollution.
Potential economic benefits
It can save fuel costs by 420 million yuan, increase cable capacity by 20%, effectively extend equipment life, reduce new construction investment, and significantly improve the availability of power grids.
Potential climate benefits
This technology reduces the power generation of the gas turbine power plant by 339 million kilowatt-hours by improving the transmission capacity of high-voltage cables, thereby directly and significantly reducing carbon emissions. Accurately assess the remaining life of cables, avoid waste of resources, extend the service life of cables, and reduce the energy consumption and carbon footprint of new cable manufacturing.
Solution supplier
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State Grid Shanghai City Electric Power Company
State Grid Shanghai City Electric Power Company provides Shanghai with a safe and reliable power supply and ensures urban operation and development.
Shanghai，China
Solution details
- Science and technology fields
This project belongs to the field of high-voltage cable operation analysis. - Main content and characteristics
Carry out research on cable remaining life and cable capacity expansion technology with the aim of comprehensively improving the usable capacity of cable power supply in metropolitan power grids by making full use of the service life and current carrying capacity of cables in transit.
(1) Research on the remaining life of high-voltage cables
In order to make full use of the service life of cables, cable remaining life prediction technology was studied through extensive sample collection, a large number of laboratory tests and modeling analysis.
A total of 213 cable samples with different aging degrees, laying methods, manufacturers, loads, and voltage levels were collected, and activation energy, initial decomposition temperature, tensile strength, and carbonyl index were tested. Accelerated thermal aging experiments, AC breakdown voltage, dielectric spectrum analysis, water tree observation, tensile experiment, FTIR, thermogravimetric analysis, differential scanning calorimetry, thermal aging experiments, etc. were also carried out. SAS professional software was used to conduct a significance test on the experimental data. The main characteristic quantities reflecting the changes in the macro performance of cables are obtained. It is the first time in China that a multi-parameter extraction method is used for residual life assessment, which greatly improves the accuracy of cable residual life prediction.
(2) Research and engineering application on capacity increasing technology for high-voltage cables
In order to give full play to the transmission capacity of the cable, model research, engineering implementation, monitoring and verification of the current carrying capacity of the cable were carried out.
Aiming at the main working conditions of Shanghai cables, a transient cable proximity heat transfer model has been established for the cable and its laying environment. It can calculate the current carrying capacity under various initial states and durations, predict the temperature field of cable conductors, and compare the theoretical model with international professional current carrying capacity software. Calculation comparisons were carried out, and the model was expanded to optimize the entire channel capacity. - Promotion situation
The first large-scale cable aging evaluation database in China has been established to evaluate the condition of old cables that have been in operation for more than 25 years in Shanghai Power Grid. Maintenance and technological transformation strategies have been revised based on the evaluation results, making full use of the remaining service life of old cables and saving underground passage resources.
Shanghai has more high-voltage cable laying methods than tunnels. The cable capacity expansion research results have been implemented and monitored on tunnels and cables respectively. Among them, the 220kV Zhaeyun 2268 cable laid in the pipeline has been operated for three years, achieving operation exceeding the design capacity, and the actual load has been increased by 20% compared with the original limit. Due to the capacity expansion of 220kV, the start-up time of the gate electric turbine power plant has been greatly reduced, the annual power generation has been reduced by 339.05 million kilowatt-hours, fuel costs have been saved by 420 million yuan, and regional air pollution has been greatly reduced.
Last updated
11:38:44, Nov 04, 2025
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