Eaton Corporation

Alexander Golubev

James Edward Smith

Martin Baier

Chandrakant Z Tailor

David A Riffe

Viktor S Rashkes

Igor Blokhintsev

An electrical system and a sensor for on-line monitoring of the state of high-voltage insulation in the electrical system. In this arrangement, the signals associated with partial discharge activity are monitored and transmitted from the sensor to monitoring instrumentation. The sensor is interconnected with the potential stress shield of existing bushings. The capacitance in the bushing between the main conductor and the stress shield conducts partial discharge current which is available for being sensed.

Electrical system with a stress shield system for partial discharge on-line monitoring of the state of high-voltage insulation

For an electrical system a sensor and associated circuits are provided for on-line monitoring of the state of the high-voltage insulation in the electrical system. In this arrangement, both the power frequency signal and of the radio frequency signals associated with partial discharge activity may be monitored and transmitted from the sensor to remote monitoring instrumentation. The sensor is disposed in a stand-off insulator which also may act to support the high voltage conductor system.

Electrical system with a stand-off insulator-sensor for on-line partial discharge monitoring of the state of high-voltage insulation

A sensor and associated circuits are provided for on-line monitoring of the state of the high-voltage insulation in electrical equipment with capacitance tap. In this arrangement, both the power frequency signal and the radio frequency signals associated with partial discharge activity are sensed. These signals are transmitted from the sensor to remote monitoring instrumentation via one connecting cable. The sensor contains a surge arrester in parallel with a capacitor shunt, a radio frequency current transformer and a connecting circuit. The polarity terminal of the primary winding of the radio frequency current transformer is connected to the tap output. The non-polarity terminal is connected to the common connection point of the surge arrester and the capacitor shunt while the second terminals of these components are connected to the local ground. The non-polarity terminal of the secondary winding of the radio frequency current transformer is connected to the non-polarity terminal of its primary winding, and the polarity terminal-to the signal conductor of the connecting circuit. The second conductor of the connecting circuit is connected to the local ground. Both the power frequency signal and the radio frequency signal are transmitted on the same cable from the sensor to the remote monitoring instrumentation.

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Maple Grove, MN, United States of America

Alexander Golubev