Application Research on Online Power Cable Temperature Detection
Research and application of distributed optical fiber sensor temperature measurement system based on Raman
Temperature Measurement Optical Cable Tunnel
Fiber optic distributed temperature sensing (DTS) systems provide continuous, real-time temperature monitoring in cable tunnels, enabling early detection of overheating and fire hazards.
Overview of Fiber Optic Temperature Monitoring
Fiber optic cables can serve as linear temperature sensors along the entire length of a tunnel or cable corridor. Distributed Temperature Sensing (DTS) systems use standard optical fibers to measure temperature profiles by analyzing the interaction of light with the fiber's glass structure. The technology relies on Raman or Brillouin scattering, where a laser pulse is sent through the fiber and the backscattered light is analyzed to determine temperature at specific points along the cable, with spatial resolution down to one meter .
Applications in Cable Tunnels
In industrial and power cable tunnels, fiber optic temperature sensors are critical for monitoring the operating conditions of high-voltage cables, transformers, and other electrical equipment. Overheating at cable joints or insulation degradation can lead to fires, equipment damage, and operational shutdowns. DTS systems allow for continuous, long-term monitoring, providing early warnings before faults escalate into serious incidents . They are particularly advantageous in electromagnetically noisy environments, where traditional point sensors may fail.
System Design and Implementation
Fiber optic temperature monitoring in tunnels can be implemented as:
- Single-point sensors: Measure temperature at specific locations, suitable for critical joints or equipment.
- Quasi-distributed or fully distributed sensors: Provide continuous temperature profiles along the entire tunnel length, enabling detection of localized hotspots and gradual temperature changes . For redundancy and reliability, systems often use dual-channel configurations, where laser pulses travel in opposite directions along the fiber. This ensures monitoring continues even if part of the fiber is damaged . Installation can involve embedding fibers in tunnel linings or attaching them along cable trays, depending on whether strain or temperature monitoring is also required .
Benefits
- Early fire detection: Rapid identification of overheating or fire sources in tunnels.
- Continuous monitoring: Real-time data allows for preventive maintenance and operational adjustments.
- Electromagnetic immunity: Fiber optics are unaffected by high-voltage or strong electromagnetic fields.
- Long-distance coverage: Single fiber can monitor tens of kilometers, reducing the need for multiple sensors .
Case Studies
The DTSX1 system by Yokogawa has been deployed in road tunnels in Germany, providing certified fire detection along 900-meter tunnel tubes. The system integrates fiber optic cables with fire alarm control panels and uninterruptible power supplies, ensuring continuous monitoring even during power outages . Similar systems are used in power cable tunnels to prevent overheating and fire hazards, ensuring safe operation of critical infrastructure .
Conclusion
Fiber optic DTS systems are a reliable and effective solution for temperature monitoring in cable tunnels. They provide high-resolution, real-time data, enhance safety by enabling early fire detection, and support the operational integrity of power and communication infrastructure. Proper design, installation, and redundancy are key to maximizing their effectiveness in tunnel environments.
Distributed fibre optic sensing and novel data
Such ongoing tunnel deterioration necessitates long-term field monitoring and assessment of the continuous
Distributed temperature sensing
OverviewMeasuring principle—Raman effectMeasuring principle—OTDR and OFDR technologyConstruction of sensing cable and system integrationLaser safety and operation of systemFor temperature estimationApplications
Distributed temperature sensing systems (DTS) are optoelectronic devices which measure temperatures by means of optical fibres functioning as linear sensors. Temperatures are recorded along the optical sensor cable, thus not at points, but as a continuous profile. A high accuracy of temperature determination is achieved over great distances. Typically the DTS systems can locate the temperature to a spatial resolution of 1 m with accuracy to within ±1 °C at a resolution of 0.01 °C. Measurement distan
distributed fiber optic temperature sensor for Cable Tunnels
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Distributed Temperature Sensing (DTS) | AP Sensing
Distributed Temperature Sensing (DTS) systems provide temperature information for accurate thermal monitoring, fire detection, and
Distributed temperature sensing
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