A simulation calculation method and system for single-phase grounding arc ignition time of a cable trench

By constructing a simulation model of the arc of a single-phase grounding fault in a cable and combining it with the electromagnetic-thermal-fluid coupling effect, the problem of accurately measuring the arc duration and ignition time was solved, improving the accuracy of fire simulation and providing a scientific basis for fire assessment.

CN122154135APending Publication Date: 2026-06-05POWER RES INST OF STATE GRID SHAANXI ELECTRIC POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
POWER RES INST OF STATE GRID SHAANXI ELECTRIC POWER CO LTD
Filing Date
2025-10-22
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing technologies are insufficient to accurately measure the duration and ignition time of arcs in single-phase grounding faults in cables. Sensor monitoring methods suffer from response delays, and fire dynamics simulation methods ignore arc power fluctuations, resulting in large deviations in simulation results and failing to fully reflect arc characteristics.

Method used

A simulation model of arc in a single-phase grounding fault of a cable was constructed. The average energy and power of the arc were calculated by numerical integration. The electromagnetic-thermal-fluid coupling effect was combined with the simulation of the cable tunnel model, and the data of the monitoring equipment were recorded.

Benefits of technology

It enables precise measurement of arc duration and ignition time, reflects the characteristics of arc power fluctuation, improves the accuracy of fire simulation, and provides a scientific basis for fire assessment in cable trenches.

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Abstract

The application relates to a cable trench single-phase grounding arc ignition time simulation calculation method and system, wherein the method comprises the following steps: constructing a cable single-phase grounding fault arc simulation model; the cable single-phase grounding fault arc simulation model comprises a cable two-dimensional geometric model, material physical property parameter and physical field coupling boundary condition; extracting an arc current and voltage waveform in a half cycle under different working conditions, calculating the arc average energy in the half cycle and the average power in the arc duration through numerical integration; constructing a cable tunnel model and configuring material parameters of the cable and the optical cable, and arranging monitoring equipment; taking the average power in the arc duration under different working conditions as a fire source heat release rate to input the cable tunnel model for simulation, and recording monitoring data of the monitoring equipment. Through the technical scheme, precise simulation calculation of cable trench single-phase grounding arc ignition time and fire can be realized.
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