G - Physics – 01 – R
Patent
G - Physics
01
R
324/58.01
G01R 13/00 (2006.01) G01R 15/14 (2006.01) G01R 31/02 (2006.01)
Patent
CA 1065016
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 carrying 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 tempera- ture of the bus can be determined within the hollow conduc- tor and can be used to activate a display adjacent an opening or window in the conductor. The display may be powered by a power supply mounted within the hollow conduc- tor with the power supply deriving a voltage from longitu- dinally 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.
315586
Boothman David R.
Murison George E.
Rehder Robert H.
Canadian General Electric Company Limited
Na
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