Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1987-05-05
1989-03-21
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 47, 324 96, 250227, H02H 308
Patent
active
048149306
ABSTRACT:
An apparatus for detecting an accident of electric wire lines a single light emitting element, a plurality of optical sensor heads arranged respectively to the lines to be observed, for modulating a light supplied form the light emitting element through a light transmission line in response to electric variations in the line, and a single light receiving element for receiving the synthetic light. Therefore, since the light transmission line is used instead of electric wires, the apparatus has good insulation characteristics and thus the apparatus is not affected by an electromagnetic induction from the electric wire lines. Moreover, since use is made of single light emitting element and single light receiving element, high S/N ratio is realized.
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Abe Masanori
Kozuka Yoshinari
Mase Syunzo
NGK Insulators Ltd.
Pellinen A. D.
Williams H. L.
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