Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-12-22
1984-10-02
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324244, 324254, G01R 3108, G01R 33025, G01R 3304
Patent
active
044750781
ABSTRACT:
A fault location system for use with sealed, gas-insulated electrical power apparatus. The system includes a sensor for placement in close proximity to the outer surface of a housing of the apparatus and a detector for in-place reading of the sensor. The detector comprises a first fluxgate magnetometer for detecting magnetization of the sensor. A second fluxgate magnetometer is positioned adjacent and parallel to the first magnetometer to detect only the background magnetic field. An alternating current electrical signal is applied to the magnetometers. A direct current is then automatically generated wherein the direct current is a function of the even harmonics of the ac output of the second magnetometer. The direct current is used to cancel the effects of the background magnetic field detected by the second magnetometer. As such, the direct current is applied to the first magnetometer to cancel the effects of the background magnetic field therefrom.
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Perry, M. P., "Fault Location in Gas-Insulated Conductors Using Magnetic Sensors", IEEE Transion Pwr. App. and Sys., vol. PAS-99, No. 4, Jul./Aug. 1980, pp. 1543-1546.
Electric Power Research Institute Inc.
Strecker Gerard R.
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