电力电缆测温案例 Power Cable Temperature Monitoring Cases
城市 500kV 超高压电缆线路（DTS 拉曼散射） Urban 500kV Extra High Voltage Cable Line (DTS Raman Scattering)
项目背景：某城市 32 公里 500kV 超高压电缆，含 16 个中间接头井，接头过热是火灾主要诱因，需实时监测全路径温度。 Project Background: A 32-kilometer 500kV extra high voltage cable in a city, including 16 intermediate joint wells. Joint overheating is the main cause of fire, requiring real-time monitoring of the full path temperature.
部署方案：沿电缆外护层螺旋缠绕感温光纤，接头段加密至每米 2 圈；选用 DTS 主机，设置1 米空间分辨率、±0.5℃测温精度，配置双阈值报警（一级 65℃、二级 70℃）。 Deployment Plan: Spiral wrap temperature-sensitive optical fiber along the cable outer sheath, with to 2 turns per meter in joint sections; select DTS host with 1-meter spatial resolution, ±0.5℃ temperature measurement accuracy, and configure dual-threshold alarm (level 1: 65℃, level 2: 70℃).
实施效果：运行期间，第 9 号接头在负荷突增时从 48℃快速升至 73.6℃，系统提前 22 分钟触发二级告警，运维人员及时排查出压接不良问题，避免重大停电事故，年减少停电损失约 120 万元。 Implementation Effect: During operation, the 9th joint quickly rose from 48℃ to 73.6℃ during sudden load increase. The system triggered a level 2 alarm 22 minutes in advance, and operation and maintenance personnel promptly identified the poor crimping problem, avoiding a major power outage accident and reducing annual outage losses by approximately 1.2 million yuan.
电厂电缆隧道综合监测（DTS + 环境联动） Power Plant Cable Tunnel Comprehensive Monitoring (DTS + Environmental Linkage)
项目背景：华东某 500MW 火电厂，主厂房至变电站 2.3 公里电缆隧道，环境密闭、设备密集，存在过热与火灾风险，需全周期监测。 Project Background: A 500MW thermal power plant in East China, with a 2.3-kilometer cable tunnel from the main factory building to the substation. The enclosed environment and dense equipment present overheating and fire risks, requiring full-cycle monitoring.
部署方案：敷设 2300 米感温光纤，覆盖电缆支架与竖井；部署 38 处多参数气体检测节点与 12 台视频摄像机，与消防、通风系统联动。 Deployment Plan: Lay 2,300 meters of temperature-sensitive optical fiber covering cable brackets and shafts; deploy 38 multi-parameter gas detection nodes and 12 video cameras, linked with fire protection and ventilation systems.
实施效果：运行半年内精准预警 6 次电缆过热事件、1 次施工烟雾异常，火灾响应时间缩短至10 秒内，误报率低于0.5%，系统稳定运行率达99.8%，实现从 “被动抢修” 到 “主动预防” 的运维转型。 Implementation Effect: Within half a year of operation, it accurately 6 cable overheating events and 1 construction smoke anomaly, fire response time was reduced to within 10 seconds, false alarm rate was below 0.5%, system stable operation rate reached 99.8%, realizing the operation and maintenance transformation from "passive repair" to "active prevention."
