Non-contact apparatus for sensing energization of high voltage s

Details Non-contact apparatus for sensing energization of high voltage s Non-contact apparatus for sensing energization of high voltage s

1993-08-03

1995-05-09

Wieder, Kenneth A.

Electricity: measuring and testing

Testing potential in specific environment

Voltage probe

324522, 324543, 324715, 361 59, 361 92, G01R 3102, H02H 300

Patent

active

054143446

ABSTRACT:
An E-field sensing apparatus detects the energization of high voltage utility transmission and distribution lines. An external housing substantially shields internal components of the apparatus from the detected E-field. A conductive wire extends from the housing where it is exposed to the E-field. A signal is induced onto the exposed wire and sensed by the apparatus. The length of exposed wire and the distance of the apparatus from the high voltage line attenuate the E-field so the induced signal is within operational parameters of internal sensing components. Adjustments to the wire length and apparatus distance enable detection of E-fields surrounding power lines carrying voltage levels of a predetermined voltage level (i.e. approximately 2000 volts and higher). In response to the E-field the apparatus generates an analog output signal and a line isolation control (one-bit digital) signal. The analog output signal drives a meter, LED or other indicating device serving to aid maintenance engineers. The analog output also provides data to a SCADA or other control/indication system. The control signal drives a relay to a normally open position or trips the relay closed when the line power fails. The control drives motors to either maintain or isolate (shut down) power lines at a power substation.

REFERENCES:
patent: 4241373 (1980-12-01), Mara et al.
patent: 4855671 (1989-08-01), Fernandes
patent: 4980790 (1990-12-01), Thibodeau
patent: 5144227 (1992-09-01), Shaw
patent: 5237480 (1993-08-01), Dara

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