Device for the automatic testing of joints in electrical high vo

Details Device for the automatic testing of joints in electrical high vo Device for the automatic testing of joints in electrical high vo

1995-02-10

1997-09-02

Mullen, Thomas

Communications: electrical

Continuously variable indicating

Combined

364483, G08C 1922, H04Q 900

Patent

active

056637187

ABSTRACT:
A device for automatic testing of electrical high voltage lines is described, comprising a support (1), a driving wheel (2) for lying against the line (3) with a remotely controlled device (4) and a means for remotely controlled automatic measurement of physical data at the joint (11) in question). Means for the transfer of measurement data to a receiver is provided along with a shielding means (15) to shield the transfer means. The device is characterized primarily in that it is provided with a guide rails means (7,8,9) for steering of the device, carried by a lifting means such as a helicopter or crane for lying the driving wheel against a line. Physical measurement may comprise contacting as well as non-contacting measurement in the vicinity of and at a joint in question. To compensate for voltages which may be induced in the measuring means, a compensation circuit is provided. The compensation circuit may be provided with a flat coil which may be rotated by a stepper motor or the like. Voltage in the measuring circuit may be measured continuously during stepwise rotation of the flat coil to determine a measured voltage minima and maxima. The minimum voltage measured correctly compensates for currents induced in the measuring circuit.

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Jannson, Peter, "Lagar ledningar utan avbrott," ERA 6-7, 1993. Jul. 1993.
Ormin, Jonas, "ROBHOT, Hotline Inspection and Control of Overhead Transmission Lines," Vattenfall Transmission Mar. 1995.
Kleveborn, Rolf, "Failing Joints in Transmission Lines", Vattenfall Transmission, Mar. 1995.
Ormin, Jonas, "ROBHOT.RTM., Base Single and Base Duplex, Hotline Inspection and Control of Overhead Transmission Lines", Vattenfall Transmission, Mar. 1995.

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