Power cable temperature measuring device

The utility model relates to a temperature measuring device for a cable in a cable trench, specifically to a power cable temperature measuring device. The power cable temperature measuring device comprises a fiber grating temperature sensor and a temperature-sensitive optical cable. The fiber grating temperature sensor is fixed to the joint of the power cable; the fiber grating of the fiber grating temperature sensor is welded to the temperature-sensitive optical cable connected with a fiber temperature measuring system; and the temperature-sensitive optical cable is integrated in a communication optical cable disposed in the cable trench. As the fiber grating temperature sensor is fixed to the joint of the power cable, the temperature of the joint of the power cable is monitored in a real time manner, i.e., the temperature of the power cable is monitored, and the monitored temperature is transmitted to the fiber temperature measuring system from the temperature-sensitive optical cable, so that the temperature of the power cable is achieved. By employing the power cable temperature measuring device provided by the utility model, the temperature of the power cable can be conveniently and effectively monitored, and safe operation for an electric power system is guaranteed.