Systems and methods for monitoring temperature of electrical conductor

A system for monitoring temperature of an electrical conductor enclosed in at least a first semi-conductive layer, the system comprising:

• a temperature sensor unit located inside the first semi-conductive layer, and comprising a micro-controller, a temperature sensor, an energy harvest sub-unit and a wireless transmitter, and the temperature sensor adapted to detect a first signal representing temperature of the electrical conductor and to supply the first signal to the micro-controller;
• and
• a transceiver unit located outside the first semi-conductive layer and comprising an energy transmitter and a wireless receiver;
• wherein, the energy harvest sub-unit is adapted to harvest electromagnetic power from the energy transmitter and to provide electrical power to the micro-controller;
• the wireless transmitter is adapted to being engaged with the wireless receiver under the control of the micro-controller to transmit a second signal converted from the first signal to the wireless receiver;
• and
• the energy harvest sub-unit and the wireless transmitter are designed to have different working frequency, wherein a ratio of the working frequency of the wireless transmitter to that of the energy harvest sub-unit is larger than 100, wherein the energy harvest sub-unit has a working frequency in a range from 10 KHz to 990 KHz, and wherein the wireless transmitter has a working frequency in a range from 10 MHz to 10 GHz.