Remote power supply system for equipment on a transmission line
First Claim
1. A remote power supply system for powering remote equipment located at a point along a transmission line, said transmission line being equipped with a remote power supply loop which passes through said point and which loops through a source of electrical energy, the system including at said point:
- a first control switch;
a looping impedance connected in series with the first controlled switch, means connecting said series connection of switch and impedance in shunt across the remote supply loop, thereby dividing the remote supply loop into two partial loops, one of which includes the source of energy;
two local power supply circuits within the remote supply loop, one on either side of the looping impedance, a first one of said local power supply circuits being within the partial loop that includes the source of energy and serving to supply power to the equipment in normal operation, the other, second local power supply circuit being within the other partial loop; and
a control circuit for said first controlled switch, the control circuit including means sensitive to the state of operation of each of the local power supply circuits and including means for closing the first controlled switch when the first local power supply circuit is not in operation and for opening the first controlled switch when both local power circuits are operating simultaneously.
1 Assignment
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Accused Products
Abstract
The present invention is concerned with maintaining the power supply to equipments along at least a section of a transmission line in the event of said line being cut. Each equipment (5) along the line (1) is provided with a local power supply circuit (6,7,9) inserted in the remote power supply loop at the equipment under consideration. A looping impedance (10) is connected in series with the break contacts (11,12) of a controlled switch and parallel across the power supply loop in such a manner as to create a partial power supply loop through the local power supply circuit when the switch is closed. Control means are provided to close the switch in the event of a power failure in the local power supply circuit, and to open the switch again only once the downstream side of the power supply loop draws current above a predetermined threshold value. The above circuit operates for a power supply loop that includes an energy source at one end (E) only of the transmission line. A variant embodiment of the invention operates in a transmission line where power may be drawn from either end. The invention is applicable to transmission circuits that include at least one branch of a point to point connection.
16 Citations
10 Claims
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1. A remote power supply system for powering remote equipment located at a point along a transmission line, said transmission line being equipped with a remote power supply loop which passes through said point and which loops through a source of electrical energy, the system including at said point:
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a first control switch; a looping impedance connected in series with the first controlled switch, means connecting said series connection of switch and impedance in shunt across the remote supply loop, thereby dividing the remote supply loop into two partial loops, one of which includes the source of energy; two local power supply circuits within the remote supply loop, one on either side of the looping impedance, a first one of said local power supply circuits being within the partial loop that includes the source of energy and serving to supply power to the equipment in normal operation, the other, second local power supply circuit being within the other partial loop; and a control circuit for said first controlled switch, the control circuit including means sensitive to the state of operation of each of the local power supply circuits and including means for closing the first controlled switch when the first local power supply circuit is not in operation and for opening the first controlled switch when both local power circuits are operating simultaneously. - View Dependent Claims (2, 3, 4, 5)
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6. A remote power supply system for powering remote equipment located at a point along a transmission line, said transmission line being equipped with a remote power supply loop which passes through said point and which, in the event of the loop being cut, is powered from both ends, the system including at said point:
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a first controlled switch; a looping impedance connected in series with the first controlled switch, said series connection of switch and impedance being shunted across the remote supply loop; two local power supply circuits inserted in the remote supply loop, one on either side of the looping impedance, one or other of said local power supply circuits serving to supply power to the equipment in normal operation, and; a control circuit for said first controlled switch, the control circuit being sensitive to the state of operation of each of the local power supply circuits, and including means for closing the first controlled switch when at least one of the local power supply circuits is not operating and for opening the first controlled switch when both of the local power supply circuits are operating. - View Dependent Claims (7, 8, 9, 10)
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Specification