The underground mine dispatching communication uses the mine communication cable reliably, or uses the optical cable reliable
Characteristics of railway signal cable1 the use of cable environment temperature is -40 degrees ~+60 degrees centigrade.2 the long-term work temperature of the conductor should be no more than +70 degrees centigrade.3 cable laying environmental temperature: PVC outer sheath cable should be not less than 0 degrees; polyethylene outer sheath cable should be not less than -20 degrees centigrade.4 the allowable bending radius of the cable: the non armoured cable shall be no less than 10 times of the outer diameter of the cable; the armored cable shall be no less than 15 times of the outer diameter of the cable.5 comprehensive sheath railway signal cable shield coefficient is less than or equal to 0.8; aluminum sheath railway signal cable shield coefficient is less than or equal to 0.3
This should be analyzed in many ways:Small coal mines, because the communication distance is not very far, the use of mine communication cables is relatively simple, maintenance requirements are relatively low.Large coal mines, because the communication distance, communication quality, and even can not communicate, this time it is necessary to use optical fiber to transmit.As for reliability, it's pretty much the same.
It is understood that the underground mine site tend to use communication cables, rather than fiber optic cables. The reason is that once the cable is damaged by mechanical external forces, the ordinary communication cable can be maintained by simple tools, and the cables must be used with special equipment.
