Cable insulation performance deterioration evaluation method after short-time over-temperature in fire environment

By establishing a cable tunnel fire simulation model and a cable insulation material over-temperature test platform, combined with molecular dynamics simulation, the degree of deterioration of cable insulation performance after short-term over-temperature in a fire environment is solved, and the problem that the existing technology cannot quickly evaluate it is achieved, and a rapid and accurate evaluation of cable insulation performance is achieved.

CN119689180AActive Publication Date: 2025-03-25STATE GRID BEIJING ELECTRIC POWER CO +2
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Patent Information

Application Number
CN202411685364.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-22
Publication Date
2025-03-25
Estimated Expiration
2044-11-22

AI Technical Summary

Technical Problem

The prior art cannot quickly evaluate the degree of deterioration of cable insulation performance after a short-term overtemperature in fire, resulting in safety hazards in subsequent operations.

Method used

By establishing a cable tunnel fire simulation model, the peak temperature of the cable insulation layer is determined, the cable insulation material over-temperature test platform is built, multiple over-temperature tests are carried out, the six indicators of the sample are tested, and three-dimensional periodic amorphous unit cells are established through molecular dynamics simulation, the temperature interval is divided, and the degree of insulation performance deterioration is evaluated.

Benefits of technology

It realizes a rapid and accurate assessment of the degree of deterioration of cable insulation performance after short-term overtemperature in a fire environment, reduces safety risks and improves the reliability of cable operation.

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Abstract

The invention discloses a cable insulation performance degradation evaluation method after short-time over-temperature in a fire environment. The method comprises the following steps: step 1, establishing a cable tunnel fire simulation model, and determining respective peak temperatures of insulating layers of simulation cables at a plurality of typical positions in the cable tunnel fire simulation model; 2, multiple over-temperature tests are carried out according to the multiple peak temperatures obtained in the step 1, and multiple samples subjected to the over-temperature tests are obtained; 3, testing six indexes of each of the plurality of samples subjected to the temperature test; 4, calculating a mean square displacement change rule of the final three-dimensional periodic amorphous unit cell at different temperatures to obtain a plurality of temperature intervals; 5, determining respective main influence indexes of the plurality of temperature intervals; and step 6, determining the degradation degree of the sample cable according to the degradation degree score and a predetermined degradation degree evaluation table. The technical problem that the cable insulation performance degradation degree after fire short-time over-temperature cannot be rapidly evaluated is solved.
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