Abstract In order to accurately and instantaneously measure the average temperatures of a plurality of intervals of a length of current carrying conductor such as a high-tension cable, a plurality of pilot wires each having a conductivity which varies according to its temperature is provided in thermal communication with corresponding intervals of the conductor along their common extents, so that the conductor and pilot wire are at essentially the same temperatures but are electrically insulated from one another. A circuit is provided for measuring the conductivity and thereby the temperature of each pilot wire, and a radio telemetry transmitter transmits this information to a receiver on the ground, from which it may be re-transmitted to any desired remote location.
Apparatus for measuring the average temperatures of a plurality of intervals of a length of current carrying conductor, comprising; a plurality of conductive means equal in number to the number of said intervals to be measured, the conductivity of which vary according to their temperature, electrically insulated from the current carrying conductor along their common lateral extent and in thermal communication therewith along substantially their entire lengths, so that the conductor and the conductive means are at essentially the same temperatures, one end of each of said conductive means being connected to the said conductor such that each conductive means spans a different number of such intervals; and means for measuring the conductance of each said conductive means.
Claim 2
Dependent Claim
118 words
Apparatus for measuring the average temperatures of a plurality of intervals of a length of current carrying conductor, comprising; a plurality of conductive means equal in number to the number of said intervals to be measured, the conductivity of which vary according to their temperature, electrically insulated from the current carrying conductor along their common lateral extent and in thermal communication therewith along substantially their entire lengths, so that the conductor and the conductive means are at essentially the same temperatures, one end of each of said conductive means being connected to the said conductor such that each conductive means spans a different number of such intervals; and means for measuring the conductance of each said conductive means.
Claim 3
Dependent Claim
28 words
Apparatus as defined in claim 1 including a radio transmitter connected to said measuring means for transmitting signals representative of the conductance of each of said conductive means.
Claim 4
Dependent Claim
46 words
Apparatus as defined in claim 2 wherein said length of current carrying conductor terminates in a pothead, including an electrically shielded housing mounted on said pothead and containing the measuring means and radio transmitter; said radio transmitter including a flush antenna mounted integrally on said housing.