The conductive material formed by forest fires produce a large amount of electric charge between conductor and ground

which will lead to discharge; air space between transmission lines breakdowns because of smog

which will lead to line tripping or railway accident. Aiming at problem of frequent line tripping because of forest fires and difficulty in preventing

based on wireless sensor networks（ WSNs） technology

three towers are selected around substation

and every tower is installed with one set of fire monitoring equipment. Those equipments can real-time monitor smoke

CO

H2S

temperature and humidity around the substation. This system realizes detection of fire around the substa

tion and fire warning of transmission lines. Monitoring results show that on April 23

June 16

temperature changes at range of 10

35 ℃

humidity change at range of 20 %

80 % RH

the change of CO range of（ 0

7） × 10- 6

H2S to 0. So far

the system has monitored two forest fires around substation.