I. Background of the Solution
Cable tunnels are critical channels for power transmission. With dense cable layouts and long-term continuous operation, the risk of fire within cable tunnels cannot be overlooked. Once a fire occurs, it may not only cause power supply interruptions but also trigger cascading accidents, resulting in significant losses. Therefore, it is essential to develop a scientific and effective fire protection solution tailored to the specific fire risks of cable tunnels.
II. Analysis of Fire Causes
Fire Caused by Poor Heat Dissipation
In cable trenches and cable galleries, cables are often stacked in multiple layers with high density, resulting in poor heat dissipation. Heat accumulation can easily lead to excessive cable temperatures, ultimately causing fires.Fire Caused by Insulation Aging and Abrasion
During operation, cable insulation may age or wear over time. This can result in arcing or discharge between live conductors or between conductors and ground, igniting the cable insulation and leading to fire.Fire Caused by Joint and Insulation Defects
Poor contact at cable joints, short-circuit impacts, and aging or deterioration of cable insulation are all potential causes of cable tunnel fires.
III. Fire Protection Measures
Fire Sealing at Critical Locations
Localized, small-space fire sealing measures should be implemented at key areas such as intersections of main and branch cable trenches, cable joints, densely crossed cable sections, cable wells, and entrances/exits of cable rooms. These measures effectively prevent and slow down fire spread.Installation of Automatic Fire Suppression Devices
Automatic fire suppression devices should be installed according to the characteristics of different areas within the cable tunnel. During installation, necessary modifications should be made based on the performance requirements of the suppression devices to ensure their effectiveness, enabling rapid fire response and suppression.
IV. Product Selection
| Model | Activation Mode | Protected Volume | Dimensions | Applicable Areas |
|---|---|---|---|---|
| QRR1GW/S-CFLC | Electrical / Thermal Activation | 8 m³ | Φ231 × 133 mm | Cable shafts, cable trenches, cable transition levels |
| QRR3GW/S-CFLC | Electrical / Thermal Activation | 20 m³ | Φ290 × 235 mm | Cable transition levels, power tunnels, integrated utility tunnels |
V. Conclusion
By thoroughly analyzing the causes of cable tunnel fires, this solution adopts a combination of targeted fire sealing and automatic fire suppression measures. Through precise product selection based on different application scenarios, it effectively enhances the fire protection capability of cable tunnels, reduces fire risks, and ensures the safe and stable operation of power transmission systems. In practical applications, strict compliance with installation and maintenance requirements is essential to ensure optimal performance of the fire protection solution.
