JPH04344720A - Feeder protection device for optical submarine cable terminator - Google Patents

Abstract

PURPOSE:To protect the optical submarine feeder by detecting the state of an earth volage check instrument and a feeder system switching device with respect to the feeder protection device of the optical submarine cable terminator. CONSTITUTION:When the feeder system switching device 11 of an optical submarine cable terminator 10 is switched to a both-end feeder system, a 1st detector 13 is set. In this case, when an earth voltage check device 12 is pulled out of the optical submarine cable terminator 10, a 2nd detector 14 is set. If both the 1st detector and the 2nd detector 14 are set, a signal is inputted to the forced feed interruption input terminal 22 of an optical submarine feeder 20. When the signal is inputted to the forced feed interruption input terminal 22, a constant current source 21 is forcedly interrupted.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a power supply protection device for an optical submarine cable termination device, and more particularly to an optical submarine cable termination device that protects the optical submarine power supply device by detecting the status of an earth voltage inspection device and a power supply system switching device. Regarding the power supply protection device.

[0002]In recent years, information and communication networks are being constructed worldwide. Communication cables are one of the hardware that supports information and communication networks. These communication cables are laid all over the world, both on land and at sea, and optical submarine cables are becoming particularly important. Furthermore, an optical submarine cable termination device is installed at the end point of an optical submarine cable.

[0003] Optical submarine cable termination equipment branches optical fibers and power supply lines that make up the optical submarine, and connects them to optical transmission terminal equipment and optical submarine cable power supply equipment, respectively. Further, an earth voltage testing device is connected to the power supply line, and has the functions of monitoring the power supply voltage, monitoring the earth voltage, and connecting one end of the power supply line to the ground. Since the optical submarine power supply device has a constant current source, it is necessary to prevent the ground connection from being released due to the ground voltage inspection device being pulled out from the optical submarine cable termination device.

0004

2. Description of the Related Art Conventionally, power supply systems for optical submarine cable termination devices include a double-end power supply system and a single-end power supply system. These power feeding methods can be switched to any one of the power feeding methods using a power feeding method switching device. Further, power is supplied by a constant current source of the optical submarine power supply device. The earth voltage testing device has the function of connecting one end of the power supply line to earth. In the double-end feeding method, the device is connected to the earth voltage testing device via a constant current source, but in the single-end feeding method, it is directly connected to the earth voltage testing device. Therefore, if the single-end power supply system was used, the earth voltage inspection device could be pulled out from the optical submarine cable termination device at any time. However, in the case of the double-end power supply system, it was necessary to shut off the optical submarine power supply equipment first.

[0005]

[Problem to be solved by the invention] However, even though it is a double-end power supply system, if the earth voltage inspection device is accidentally pulled out from the optical submarine cable termination device due to premature connection or misunderstanding, a constant current will continue to flow. The problem was that the voltage inside the constant current source rose, eventually destroying the optical submarine power supply system.

[0006] The present invention has been made in view of the above points, and the present invention has been made in view of the above-mentioned points. An object of the present invention is to provide a power supply protection device for an optical submarine cable termination device that protects an optical submarine power supply device.

[0007]

[Means for Solving the Problems] FIG. 1 is a diagram illustrating the principle of the present invention. The optical submarine cable termination device 10 includes a power supply system switching device 11, an earth voltage testing device 12, a detector 13, a detector 14, and a series connection circuit 15. The power feeding method switching device 11 is a switching device that switches the power feeding method to either a two-end power feeding method or a one-end power feeding method. The earth voltage testing device 12 is a testing device that has the functions of monitoring the power supply voltage, monitoring the earth voltage, and connecting one end of the power supply line to the ground. The detector 13 is
This is a device that detects whether the power feeding system switching device 11 has been switched to the both-end power feeding system. The detector 14 is a device that detects whether the earth voltage inspection device 12 is installed in the optical submarine cable termination device 10 or not. The series connection circuit 15 is a circuit in which the detector 13 and the detector 14 are connected in series.

The optical submarine power supply device 20 has a constant current source 21, and the constant current source 21 is provided with a power supply forced disconnection input terminal 22. The constant current source 21 supplies power to the optical submarine repeater on the ocean floor via the power supply line of the optical submarine cable. The power supply forced cutoff input terminal 22 is a signal input terminal that forcibly cuts off the constant current source 21 when a signal is input. Furthermore, the series connection circuit 15 is connected to a power supply forced disconnection input terminal 22 .

[0009]

[Operation] The detector 13 is turned on when the power supply system switching device 11 is switched to the both-end power supply system. Also,
The detector 14 is turned ON unless the earth voltage inspection device 12 is installed in the optical submarine cable termination device 10. If both the detector 13 and the detector 14 are ON, a signal is input to the power supply forced disconnection input terminal 22.

Therefore, when the power supply system switching device 11 is switched to the both-end power supply system and the earth voltage inspection device 12 is pulled out from the optical submarine cable termination device 10, the power supply forced disconnection input of the optical submarine power supply device 20 occurs. A signal is input to the terminal 22, and the constant current source 21 is forcibly cut off. Therefore, even if the earth voltage inspection device 12 is accidentally pulled out from the optical submarine cable termination device 10, a situation in which the optical submarine power supply device 20 is destroyed can be avoided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing the overall configuration of an embodiment of the present invention. In the figure, an optical submarine cable termination device 10 includes a power supply system switching device 11, an earth voltage inspection device 12, a switch 13, a switch 14, a series connection circuit 15, and an optical submarine cable branching device 16.

The power supply system switching device 11 is a switching device for switching to either a double-end power supply system or a single-end power supply system, and has switches 17 and 18. switch 1
7 has a terminal 17a and a terminal 17b. Similarly, switch 18 has terminal 18a and terminal 18b. The power supply line 42 from the terminal 17a and the terminal 18b is connected to the optical submarine power supply device 20.

The earth voltage testing device 12 is a testing device that has the functions of monitoring the power supply voltage, monitoring the earth voltage, and connecting one end of the power supply line to the ground. Furthermore, the earth voltage testing device 12 has terminals 12a, 12b, and 12c, all of which are grounded underground. The terminal 12a is a terminal for obtaining a reference value of the ground potential, and is called a station ground. The terminals 12b and 12c are terminals used for normal grounding, and are called beach ground because they are buried on the beach outside the station building. It is also a terminal for obtaining a ground potential based on the ground potential of the terminal 12a. These terminals are provided to constantly monitor and keep the ground potential constant, since fluctuations in the ground potential have a large effect on the energized voltage. In addition, two seashore grounding terminals are provided because if only one terminal is disconnected, it will not be possible to ground the cable, and this protects the optical submarine cable power supply device 20, especially when connected in a double-end power supply system. This is a redundant configuration to prevent a situation in which the system cannot be used.

The switch 13 detects whether the power supply system switching device 11 is switched to the double-end power supply system, and the switch 14 detects whether the earth voltage inspection device 12 is installed in the optical submarine cable termination device 10. Detect. Further, the series connection circuit 15 includes the switch 13 and the switch 14.
This is a circuit in which these are connected in series.

The optical submarine cable branching device 16 branches the optical submarine cable 40 into an optical fiber 41 and a power supply line 42, and connects them to the optical transmission terminal device 30 and the power supply system switching device 11, respectively.

[0016] Here, the switches 17, 18 and switch 13 of the power supply system switching device 11 operate in conjunction with each other. FIG. 2 shows the state of the switch in the case of the one-end power feeding system. That is, the switch 17 is on the terminal 17b side, the switch 18 is on the terminal 18a side, and the switch 13 is OFF.
It is in state F.

The optical submarine power supply device 20 is composed of a constant current source 21 and a power supply forced disconnection input terminal 22. The constant current source 21 supplies power to the feeder line of the optical submarine cable. The series connection circuit 15 is connected to the power supply forced cutoff input terminal 22 . When a signal is input to the power supply forced cutoff input terminal 22, the constant current source 21 is forcibly cut off.

The optical transmission terminal equipment 30 is a device that transmits and receives optical multiplex signals to and from the optical submarine cable, connects the optical submarine cable to the optical land cable, and has maintenance equipment for the optical submarine cable and various equipment.

The optical submarine cable 40 is a transmission line for transmitting optical multiplexed signals, and is connected to the optical submarine cable termination device 10.

Next, the operation of the power supply protection device for the optical submarine cable termination device of the present invention will be explained. The switch 13 is turned on when the power supply system switching device 11 is switched to the both-end power supply system. That is, in the power supply system switching device 11, the switch 17 is on the terminal 17a side, and the switch 18 is on the terminal 18b side.

If the earth voltage inspection device 12 is not installed in the optical submarine cable termination device 10 at this time,
That is, when the earth voltage inspection device 12 is pulled out from the optical submarine cable termination device 10, the switch 14 is turned on.

If both the switch 13 and the switch 14 are ON, a signal is input to the power supply forced cutoff input terminal 22. The constant current source 21 is forcibly cut off when a signal is input to the power supply forced cutoff input terminal 22. As a result, even if the earth voltage testing device 12 is accidentally pulled out, the constant current source 21 will not be destroyed.

In the above description, a switch was used as a means for inputting a signal from the signals of the two detectors to the power supply forced cutoff input terminal of the constant current source, but a relay may also be used.

[0024]

Effects of the Invention As explained above, in the present invention, a detector is provided in each of the power supply system switching device and the ground voltage inspection device, and the power supply system is a double-end power supply system, and the ground voltage from the optical submarine cable termination device is If the inspection device is pulled out, the constant current source of the optical submarine power supply device is forcibly cut off, so the optical submarine power supply device can be protected.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention.

FIG. 2 is a diagram showing the overall configuration of an embodiment of the present invention.

[Explanation of symbols]

10 Optical submarine cable termination equipment 11 Power supply method switching device 12 Earth voltage inspection device 13 First detector 14 Second detector 15 Series connection circuit 20 Optical submarine power supply equipment 21 Constant current source 22 Power supply forced disconnection input terminal

Claims (2)

[Claims] 1. A power supply protection device for an optical submarine cable termination device (10), comprising: a power supply system switching device (
11), a first detector (13) that detects whether the power feeding system switching device (11) is a double-end feeding system, a ground voltage testing device (12) that tests the ground voltage, and a A second device for detecting whether or not the earth voltage inspection device (12) is mounted on the submarine cable termination device (10).
a constant current source (21) that supplies power to a feeder line of the optical submarine cable; a constant current source (21) having a detector (14); A series connection circuit (15) consisting of a second detector (14) is connected to the optical submarine power supply, and the power supply forced disconnection input terminal (22) for forcibly shuts off the constant current source (21). A power supply protection device for an optical submarine cable termination device, comprising: a device (20); 2. The power supply for an optical submarine cable termination device according to claim 1, wherein the first detector (14) and the second detector (15) are both configured with a switch. Protective device.