Study and application on cable duct gas online monitoring system based on GPRS

A large number of overhead power lines are transferred to underground due to city beautification recently in China. Leakage gas from the pipeline usually spreads to the cable duct. It becomes a risk issue to cable operation safety and higher demand for safe protection of the cable duct is needed. The paper describes the online auto-monitoring system of city underground cable duct, that is the design and implementation scheme of cable duct online auto-monitoring flammable and explosive gas project of Jinan power supply company. The system terminal adopts the wireless flammable gas explosion-proof detector, and the cable duct flammable and explosive gas online auto-monitoring center is established in cable duct operation and management unit. Operation and monitoring results shows that it can timely and accurately monitor the specific location of flammable gas leakage, avoiding fire and explosion accidents due to gas leaking to the cable duct to maximum extent, and providing a good reference against similar risk.