Sensing electrical parameters inside conductors

Details Sensing electrical parameters inside conductors Sensing electrical parameters inside conductors

G - Physics

01

R

324/58

G01R 13/00 (2006.01) G01K 13/00 (2006.01) G01R 15/14 (2006.01) G01R 31/02 (2006.01)

Patent

CA 1063176

ABSTRACT OF THE DISCLOSURE Parameters associated with a bus, which may be either an unshielded hollow conductor or a shielded hollow conductor, may be difficult to determine when the bus is carry- ing large currents at high voltages. An indicator carrying a display is mounted internally to be visible through a window and thereby avoid conductors running from a high voltage region to an external place. Thus temperature of the bus can be determined within the hollow conductor and can be used to activate a display adjacent an opening or window in the conduc- tor. The display may be powered by a power supply mounted within the hollow conductor with the power supply deriving a voltage from longitudinally spaced points on the inner surface of the hollow conductor. The current in the hollow conductor may be determined by measuring the IR drop between spaced points on the inner surface of the conductor, measuring the operating temperature of the conductor, determining the resistance from the measured temperature and the temperature/ resistance characteristic, and using the resistance and IR drop to determine current. Similarly the IX drop can be determined by using a loop enclosing a longitudinally extending portion of the hollow conductor, and this in turn can be used to determine reactance if the current is known.

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