Communications: electrical – Systems – Selsyn type
Patent
1998-07-16
1999-11-30
Crosland, Donnie L.
Communications: electrical
Systems
Selsyn type
34031003, 359142, H04B 100, H04B 1008
Patent
active
059949996
ABSTRACT:
A low voltage link for converting on/off orders between a relay building and remote high or medium voltage electrical disconnection apparatus, the link being mainly constituted by a bundle of electrical lines extending from the building to the remote apparatus, each line serving to convey an on/off order in the form of a voltage step. The voltage step transmitted on each line is converted, at the end of the line close to the electrical apparatus, into a two-state optical signal by an electro-optical conversion unit associated with said line, said optical signal then being delivered to an opto-electronic conversion unit associated with the electro-optical conversion unit in order to deliver a two-state electrical control signal to the apparatus. A crosstalk reduction device is provided at the terminals of each electro-optical conversion unit to reduce the level of a crosstalk voltage peak received at the terminals of said unit by use of a capacitive circuit forming a voltage divider, and to subtract a certain voltage from the reduced voltage peak by use of a zener diode so that the voltage peak received at the terminals of the electro-optical conversion unit is not detected thereby.
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Patent Abstracts of Japan, vol. 009, No. 053 (E-301, Mar. 7, 1985 corresponding to JP 59 193633 A (Fujitsu KK) Nov. 2, 1984.
Patent Abstracts of Japan, vol. 096, No. 002, Feb. 29, 1996 corresponding to JP 07 273692 A (Hitachi Ltd) Oct. 20, 1995.
Crosland Donnie L.
GEC Alsthom T & D SA
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