Technology and device for precisely measuring temperature of cable joint on the basis of radio frequency technique

摘要

The invention provides a method and a device for on-line measuring the inner temperature of a cable joint, the device includes a built-in temperature measurer and an outside receiver. The built-in temperature measurer measures the temperature of the cable joint or a core wire surface by means of direct contact measuring method, and transmits the data to the outside receiver through an insulating layer by means of the radio frequency identification technique. At the same time, the outside receiver supplies power energy to the built-in temperature measurer by means of the radio frequency signal, so it resolves the problem of supplying power to the built-in temperature measurer. The device of the invention has the advantage of accurately measuring temperature, small volume, superior applicability and so on.

主权项

1. A temperature measuring device for an underground power cable joint comprising a copper connection pipe connecting two cable segments of an underground cable and an insulating sleeve covering the connection pipe, the temperature measuring device comprising:
a built-in temperature measurer located on the underground cable joint between the connection pipe and the insulating sleeve, the built-in temperature measurer operative to exchange data with an external receiver by a radio frequency identification (RFID) technique and comprising a radio frequency induction coil operative to receive power in the form of a radio frequency signal and having a power supply transform circuit for the received power supplying all circuitry in the built-in temperature measurer, the built-in temperature measurer not comprising another power source; a radio-frequency antenna located on the underground cable outside the insulating sleeve, aligned with the built-in temperature measurer and operative to receive temperature data from the built-in temperature measurer by the RFID technique and to supply power to the built-in temperature measurer by radio frequency induction; an outside receiver located on the underground cable outside the insulating sleeve, separate from the radio frequency antenna and connected to the radio frequency antenna by a conducting wire.