Low voltage link for transmitting on/off orders
First Claim
1. A low voltage link for converting on/off orders between a relay building and a remote high or medium voltage electrical disconnection apparatus, the low voltage link comprising:
- a bundle of electrical lines extending from the relay building to the remote electrical disconnection apparatus, each line serving to convey an on/off order in the form of a voltage step, wherein the voltage step transmitted on each line is converted, at the end of the line proximate the remote electrical disconnection apparatus, into a two-state optical signal by an electro-optical conversion unit having terminals and which is associated with said line, said optical signal being delivered to an opto-electronic conversion unit associated with the electro-optical conversion unit to deliver a two-state electrical control signal to the remote electrical disconnection apparatus, and wherein a crosstalk reduction device is provided at the terminals of each electro-optical conversion unit, said crosstalk reduction device including;
a capacitive circuit forming a voltage divider which reduces a level of a crosstalk voltage peak received at the terminals of said electro-optical conversion unit thereby to obtain a reduced voltage peak; and
a zener diode which subtracts a voltage from the reduced voltage peak, so that the reduced voltage peak received at the terminals of the electro-optical conversion unit is not detected thereby.
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Accused Products
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.
36 Citations
4 Claims
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1. A low voltage link for converting on/off orders between a relay building and a remote high or medium voltage electrical disconnection apparatus, the low voltage link comprising:
- a bundle of electrical lines extending from the relay building to the remote electrical disconnection apparatus, each line serving to convey an on/off order in the form of a voltage step, wherein the voltage step transmitted on each line is converted, at the end of the line proximate the remote electrical disconnection apparatus, into a two-state optical signal by an electro-optical conversion unit having terminals and which is associated with said line, said optical signal being delivered to an opto-electronic conversion unit associated with the electro-optical conversion unit to deliver a two-state electrical control signal to the remote electrical disconnection apparatus, and wherein a crosstalk reduction device is provided at the terminals of each electro-optical conversion unit, said crosstalk reduction device including;
a capacitive circuit forming a voltage divider which reduces a level of a crosstalk voltage peak received at the terminals of said electro-optical conversion unit thereby to obtain a reduced voltage peak; and a zener diode which subtracts a voltage from the reduced voltage peak, so that the reduced voltage peak received at the terminals of the electro-optical conversion unit is not detected thereby. - View Dependent Claims (2, 3, 4)
- a bundle of electrical lines extending from the relay building to the remote electrical disconnection apparatus, each line serving to convey an on/off order in the form of a voltage step, wherein the voltage step transmitted on each line is converted, at the end of the line proximate the remote electrical disconnection apparatus, into a two-state optical signal by an electro-optical conversion unit having terminals and which is associated with said line, said optical signal being delivered to an opto-electronic conversion unit associated with the electro-optical conversion unit to deliver a two-state electrical control signal to the remote electrical disconnection apparatus, and wherein a crosstalk reduction device is provided at the terminals of each electro-optical conversion unit, said crosstalk reduction device including;
Specification
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- Resources
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Current AssigneeGEC Alsthom T&D SA
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Original AssigneeGEC Alsthom T&D SA
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InventorsEbersohl, Gerard
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Primary Examiner(s)Crosland, Donnie L.
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Application NumberUS09/116,210Time in Patent Office502 DaysField of Search340/310.01, 340/310.03, 340/310.06, 340/825.72, 340/531, 340/555, 359/142-144, 359/111, 359/109US Class Current398/106CPC Class CodesH04B 10/85 Protection from unauthorise...
