JP2946946B2 - Power supply line switching circuit for submarine cable system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feed line switching circuit for a submarine cable system, and more particularly to a feed line switching circuit for a submarine cable system having a branch path.

[0002]

2. Description of the Related Art Referring to FIG. 4, a feed line switching circuit of a conventional submarine cable system includes electromagnet coils 1, 3, and 3.
7, 9 and relays 12, 32, 71, 72, 91, 92
The electromagnet coil 1 is a relay 12, the electromagnet coil 3 is a relay 32, and the electromagnet coil 7 is a relay 7
1, 72 and the electromagnet coil 9 are relays 91, 92
Are driven by respective predetermined currents. FIG. 4 shows an initial state of the power supply line switching circuit of the conventional submarine cable system, that is, an open / closed state of each relay before each electromagnet coil drives each relay.

FIG. 2 shows the operation of a submarine cable system using a feed line switching circuit of a conventional submarine cable system.
5 in conjunction with FIG. 4, the power supply devices 101, 102, and 103 are both constant current power supplies and can be used as constant voltage power supplies, and have a positive or negative power supply polarity. Can also be set. Here, the power supply devices 101 and 103 supply power at a positive voltage, and the power supply device 102 supplies power at a negative voltage. The power supply start-up operation procedure is indicated by in FIG. 5. First, the power supply apparatuses 101 and 102 are started up, and then the power supply apparatus 103 is started up. At this time, first, the power supply device 103 keeps the path leading to the power supply path γ internally open,
1 is set as a constant current source, and the power supply device 102 is set as a constant voltage source. Note that, when the power supply current I2 flows between the power supply devices 101 and 102, the voltage at the end point C of the power supply line switching circuit 200 (that is, the voltage at the connection points X, Y, and Z) is set to the ground potential. Power supply voltage V1 of the power supply device 101
The power supply voltage V2 of the power supply device 102 is predetermined. Next, the power supply start-up operation procedure will be described.
In the procedure, the power supply voltage V1 at which the electromagnet coil 3 does not drive the relay 32 (the power supply devices 101 and 10
Until the power supply current I1 flows between the power supply device 102 and the power supply device 102).
Operate. In the procedure, the electromagnet coil 3
The power supply device 101 is operated until the power supply current I2 for driving the power supply (the power supply voltage of the power supply device 101 at this time becomes V2). As a result, the relay 32 opens the contact point a and the contact point b to open the end point C and the connection point Z, and short-circuits the contact point a and the contact point c to short-circuit the end point C and the end point D. . In the procedure, the power supply current of the power supply apparatus 101 is set to a predetermined I
3 (at this time, the power supply voltage of the power supply apparatus 101 becomes V3)
The power supply device 101 is operated up to this point. In the procedure, the power supply voltage of the power supply device 102 is set to a predetermined V4 (at this time, the power supply voltage of the power supply device 101 is V5 so that the power supply voltages of the power supply device 101 and the power supply device 102 have opposite polarities and substantially the same voltage value. ≒ −V4, and the power supply devices 101 and 10
Until the power supply current flowing between the two becomes I3).
Operate 2. In the procedure, the path leading to the power supply path γ inside the power supply apparatus 103 which was initially opened is connected, and the power supply apparatus 103 is turned on until a predetermined power supply current I3 (at this time, the power supply voltage of the power supply apparatus 103 becomes V6). Manipulate. As a result, the contact a of the relay 32 is
And the supply current I3 flows through the contact b and the relay 91
Is driven to short-circuit the contacts so that the end points c and e are short-circuited, and the contacts of the relay 92 are opened. After the above-described power supply startup, the power supply devices 101, 102, and 103 all operate as constant current sources, and the power supply current is constant current I3. The power supply lowering operation procedure is performed in a procedure reverse to the power supply raising operation procedure described above. In the above power supply operation, the power supply device 101 and the power supply device 102 are used first, but the same applies to the case where the power supply operation is performed using the power supply device 102 and the power supply device 103 first.

Next, a description will be given of power supply in the case where a failure occurs in which any one of the three power supply paths α, β and γ is disconnected during power supply after the above-described power supply startup. When the power supply path α is disconnected, the power supply apparatuses 101 and 102
Between the power supply device 103 and the power supply line switching circuit 200 is short-circuited between the contacts of the relay 91 by the electromagnet coil 9 and between the contacts of the relay 92. Is open, the relay 32 is restored, the contact between the contacts a and c is opened, and even if the contacts a and b are short-circuited, the power supply to the power supply path γ is maintained. It is possible to re-feed power to the power supply paths β and γ by the power supply devices 102 and 103 with the power supply path α disconnected. When the power supply path γ is disconnected, the power supply between the power supply apparatus 103 and the power supply path switching circuit 200 stops, but the power supply apparatus 1
In the power supply between the power supply device 01 and the power supply device 102, the power supply to the power supply paths α and β is maintained because the electromagnet coil 3 opens the contact point a and the contact point b of the relay 32. Power supply device 101 and power supply device 102 with power supply path γ disconnected
Is possible to supply power again to the power supply path α and the power supply path β. When the power supply path β is cut off, the power supply between the power supply apparatus 101 and the power supply apparatus 102 is stopped. However, between the power supply apparatus 103 and the power supply path switching circuit 200, the contact of the relay 91 is short-circuited by the electromagnet coil 9 and the relay 92 is turned off. Is open, the power supply to the power supply path γ is maintained. However, power cannot be supplied to the power supply path α. When the power supply apparatus 101 and the power supply apparatus 103 supply power to the power supply path α and the power supply path γ in a state where the power supply path β is disconnected, the open / close state of each relay at the time of power supply startup is the initial state in FIG. Therefore, the power supply current flows through the electromagnet coil 1 and the electromagnet coil 3, and the contact between the contact a and the contact b of each of the relay 12 and the relay 32 is opened, which is impossible.

In the conventional power supply line switching circuit of the submarine cable system, the power supply voltage of the power supply device 101 can be changed from the beginning to the V3 voltage without performing the operation procedure at the time of the power supply start-up operation. When the terminal C is started up, the end point C is rapidly grounded from a high voltage, an excessive current flows through the electromagnet coil, and the power supply line switching circuit is destroyed. Furthermore, when the power supply path β is disconnected, power cannot be supplied to the remaining power supply paths α and γ again.

[0005]

A feed line switching circuit for a submarine cable system according to the present invention comprises a first end point, a second end point,
It has a third end point and a fourth end point, a first end point, a second end point, and a third end point, and has a first end point and a first end point.
Connected in series between the
And a second relay for short-circuiting the end point of the first connection point and the first connection point, and connected in series with the first resistor in a closed state at the time of recovery and connected in parallel to the first relay. The first electromagnet coil is connected to the first end point and the second
And a third relay connected between the second end point and the second connection point, and connected in series between the second end point and the second connection point, and short-circuited between the second end point and the second connection point in a closed state upon restoration. A fourth relay and a fifth relay to be turned on, and a second electromagnet coil which is connected in series with the second resistor in a closed state at the time of recovery and connected in parallel to the fourth relay and closed in a driving state. A sixth relay connected between the second end point and the fourth end point, and a third relay connected in series between the third end point and the third connection point and closed in the closed state upon restoration; No. 7 for shorting the connection point 3
Relay and eighth relay, and third
A ninth relay connected in series with the resistance of the third relay and connected in parallel with the seventh relay to connect the third electromagnet coil between the third end point and the fourth end point in a closed state during driving; In the closed state at the time of recovery, the fourth connection point between the first connection point and the second connection point
And a tenth relay connecting the fifth electromagnet coil and the fifth electromagnet coil 6 in series, and a sixth electromagnet coil and a seventh electromagnet coil between the second connection point and the third connection point in the closed state at the time of restoration. An eleventh relay for connecting the electromagnet coils 4 in series, and an eighth electromagnet coil and a ninth electromagnet coil 5 connected in series between the third connection point and the first connection point in a closed state during recovery. A twelfth relay, a fourth resistor connected in series between a first end point and a fourth end point when the first relay is driven, a thirteenth relay, and the second relay. The first electromagnet coil to be driven, the thirteenth relay which is connected in parallel to the fourth resistor when the first relay is driven, and is closed when driven, and the third relay which is closed when the fourth relay is driven. A fifth resistor connected in series between the second endpoint and the fourth endpoint And the second electromagnet coil that drives the fourteenth relay and the fifth relay, and the fourteenth relay that is connected in parallel with the fifth resistor when the fourth relay is driven, and is closed when driven. And a sixth resistor connected in series between a third end point and a fourth end point when the seventh relay is driven, and a fifteenth relay and driving the eighth relay. A third electromagnet coil, the fifteenth relay connected in parallel with the sixth resistor when the seventh relay is driven, the fifteenth relay closed when driven, and the sixth relay driving the relays 11 and 12 , The eighth electromagnet coil that drives the relays 21 and 22, the fourth electromagnet coil that drives the relays 31 and 32, and the seventh electromagnet that drives the relay 40 Ko Comprising a Le, said ninth electromagnetic coil for driving the relay 50, and the fifth electromagnetic coils for driving the relay 60.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. Referring to FIG. 1 showing an embodiment of the present invention, a feed line switching circuit of a submarine cable system includes an electromagnet coil 1,
2,3,4,5,6,7,8,9 and relay 11,1
2,21,22,31,32,40,50,60,7
1, 72, 81, 82, 91, 92 and resistors 401, 4
02, 403, 404, 405 and 406, the electromagnet coil 1 is for relays 11 and 12, the electromagnet coil 2 is for relays 21 and 22, and the electromagnet coil 3 is for relay 3
1, 32, the electromagnet coil 4 is the relay 40, the electromagnet coil 5 is the relay 50, and the electromagnet coil 6 is the relay 60.
The electromagnet coil 7 drives the relays 71 and 72, the electromagnet coil 8 drives the relays 81 and 82, and the electromagnet coil 9 drives the relays 91 and 92 with respective predetermined currents. The resistor 401 is connected to the contact c of the relay 12, the resistor 402 is connected to the contact c of the relay 32, the resistor 403 is connected to the contact c of the relay 22,
The resistor 404 is connected to the contact b of the relay 40, the resistor 405 is connected to the contact b of the relay 50, and the resistor 406 is connected to the contact b of the relay 60. FIG. 1 shows an initial state of the power supply line switching circuit of the submarine cable system of the present invention, that is, an open / closed state of each relay before each electromagnet coil drives each relay. Here, the operation of the submarine cable system by the power supply line switching circuit of the submarine cable system of the present invention will be described in detail with reference to FIGS. 2 and 3 in conjunction with FIG. 1. The power supply device 101, the power supply device 102, and the power supply device 103 Is a constant current power supply and can be used as a constant voltage power supply, and the power supply polarity can be set to either positive polarity or negative polarity. Here, the power supply devices 101 and 103 supply power at a positive voltage, and the power supply device 102 supplies power at a negative voltage. The power supply start-up operation procedure is indicated by in FIG. 3. First, the power supply apparatuses 101 and 102 are started, and then the power supply apparatus 103 is started. At this time,
The power supply device 103 keeps a path leading to the power supply path γ open inside, the power supply device 101 is set as a constant voltage source, and the power supply device 102 is set as a constant current source. Next, the power supply start-up operation procedure will be described. In the procedure, the power supply apparatus 101 controls the power supply voltage to V5. The power supply current at this time is: power supply device 101 → power supply path α → end point A → relay 12
→ Connection point X → Connection point Y → End point B → Power supply path β → Power supply device 1
It flows on the route 02. The power supply voltage of the power supply apparatus 101 is V5
While ascending, the electromagnet coil 3 opens the contact between the contacts of the relay 31 and opens the contact between the contact a and the contact b of the relay 32 to short-circuit the contact a and the contact c to connect the end point C and the junction point Z. And the electric charge accumulated in the power supply path γ is discharged from the end point D to the ground through the resistor 402. At this time, the resistor 402 serves to suppress the discharge current from the power supply path γ from damaging the electromagnet coil 9. The relay 31 is opened in the process of operating the power supply voltage up to V5 by the power supply device 101, and a current flows through the electromagnet coil 5, the electromagnet coil 2, the electromagnet coil 4, and the electromagnet coil 1 so that the electromagnet coils 5, 2, 4 , 1 play a role. Next, the electromagnetic coil 6 is connected to the contact a of the relay 60.
And the contact b is opened, the contact a and the contact c are short-circuited, and the end point C is grounded via the end point D. In the procedure, the power supply voltage of the power supply device 102 is set to a predetermined V4 (at this time, the power supply voltage of the power supply device 101 is V5 so that the power supply voltages of the power supply device 101 and the power supply device 102 have opposite polarities and substantially the same voltage value. ≒ −V4, and the power supply devices 101 and 10
Until the power supply current flowing between the two becomes I3).
Operate 2. In the procedure, the internal path leading to the power supply path γ of the power supply device 103 that was initially opened is short-circuited, and the power supply device 103 is operated until a predetermined power supply current I3 (the power supply voltage of the power supply device 103 becomes V6 at this time). I do.
At this time, the supply current I3 first flows through the contacts a and b of the relay 60, and then the electromagnet coil 9
Are short-circuited, and the contacts of the relay 92 are opened. At this time, the electromagnet coil 9 and the relay 60 supply the current I
3 serves to prevent the resistor 402 from being thermally broken by flowing into the resistor 402. Next, the power supply lowering operation procedure will be described. Power supply shutdown operation is the reverse procedure of startup operation →
Perform with →. In the procedure, the power supply voltage of the power supply device 103 is reduced from V6 to the ground potential. At this time, the electromagnet coil 9 opens between the contacts of the relay 91 and short-circuits between the contacts of the relay 92. At this time, the end point C is the contact a of the relay 32.
And the contact point b is open, so that it is separated from the connection point Z to which a high voltage is applied. In the procedure, the power supply current of the power supply device 102 is set to a predetermined I3 (at this time, the power supply device 10
2 becomes V4) to the ground potential, and the power supply device 103 releases the path leading to the internal power supply path γ. In the procedure, the power supply voltage of the power supply apparatus 101 is set to V5
To ground potential. At this time, as the power supply voltage V5 decreases, the electromagnet coil 6 first restores the relay 60 to open the contact a and the contact c and short-circuit the contact a and the contact b. As a result, the end point C is connected to the connection point Z via the resistor 406 and the relay 92, and the power supply path γ is connected to the resistor 4
06. At this time, the resistor 406 is connected to the power supply switching circuit 200 by the current charged and discharged in the power supply path γ.
It plays a role in keeping the electromagnet coil inside from being destroyed. Next, the electromagnetic coil 3 is restored, and the contact a of the relay 32 is restored.
And the contact c is opened, and the contact a and the contact b are short-circuited.
In the above power supply operation, the power supply device 101 and the power supply device 102 are used first, but the same applies to the case where the power supply operation is performed using the power supply device 102 and the power supply device 103 first. When a power supply operation is performed using the power supply device 101 and the power supply device 103 for the first time, the same operation can be performed by setting the power supply device 103 to a negative voltage.

Next, a case will be described in which a failure occurs in which any one of the three power supply paths α, β and γ is disconnected during the power supply after the above-described power supply startup. When the power supply path α is cut off, the power supply between the power supply apparatus 101 and the power supply apparatus 102 stops, and power supply to the power supply path β becomes impossible.
The contact between the relay 91 and the power supply line switching circuit 200 is short-circuited between the contacts of the relay 91 by the electromagnet coil 9 and the contact between the relays 92 is open, so that the power supply from the power supply device 103 to the power supply line γ is maintained. It is possible to re-feed power to the power supply paths β and γ by the power supply devices 102 and 103 with the power supply path α disconnected. When the power supply path γ is disconnected, power supply between the power supply apparatus 103 and the power supply path switching circuit 200 stops, but power supply to the power supply path γ becomes impossible. Coil 3
Makes the contact between the contact a and the contact b of the relay 32 open, the power supply to the power supply path α and the power supply path β is maintained. It is possible for the power supply devices 101 and 102 to re-feed power to the power supply lines α and β while the power supply line γ is disconnected. When the power supply path β is disconnected, the power supply between the power supply apparatus 101 and the power supply apparatus 102 stops, but the power supply apparatus 103
The electromagnet coil 9 is connected to the relay 9 between the
Since the contacts between the contacts 1 are short-circuited and the contacts between the relays 92 are open, the power supply to the power supply path γ is maintained. However, power cannot be supplied to the power supply path α. The re-feeding of the power to the power supply paths α and γ by the power supply devices 101 and 103 in the state where the power supply path β is cut off is performed in the initial state of opening and closing each relay at the time of power supply startup in FIG. The power supply current flows in the path from the connection point X to the connection point Z to the end point C, the electromagnetic coil 5 opens the contact a and the contact b of the relay 50, and the electromagnet coil 2 opens the contact a and the contact b of the relay 22 and the relay. This is possible because the 22 contacts are open.

[0007]

As described above, the power supply circuit switching circuit of the submarine cable system according to the present invention uses the power supply line switching circuit to switch the charging / discharging current flowing between the power supply line and the power supply line switching circuit during the power supply start-up and power-down operations. By flowing the current through a resistor provided in the circuit, it is possible to prevent an excessive current from flowing through the electromagnet coil and break the power supply line switching circuit. Further, even if any one of the three power supply paths is cut off, power can be supplied again to the remaining two power supply paths with one of the power supply paths cut off.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a power supply line switching circuit of a submarine cable system of the present invention.

FIG. 2 is a block diagram of a submarine cable system.

FIG. 3 is a diagram illustrating an example of a power supply start-up operation procedure using a power supply path switching circuit of the submarine cable system of the present invention.

FIG. 4 is a block diagram showing a power supply line switching circuit of a conventional submarine cable system.

FIG. 5 is a diagram illustrating an example of a power supply start-up operation procedure using a power supply line switching circuit of a conventional submarine cable system.

[Explanation of symbols]

1,2,3,4,5,6,7,8,9 Electromagnet coil 11,12,21,22,31,32,40,50,6
0 Relays 71, 72, 81, 82, 91, 92 Relays 101, 102, 103 Power supply device 200 Power supply line switching circuit 201, 202, 203 Terminal device 301, 302, 303, 304, 305, 306 Submarine repeater 401, 402, 403, 404, 405, 406 Resistance X, Y, Z Connection points a, b, c Relay contacts α, β, γ Feeding path

Claims (1)

(57) [Claims] A first end point, a second end point, a third end point, and a fourth end point; a first connection point, a second connection point, and a third connection point; A first relay and a second relay which are connected in series between the end point of the first connection point and the first connection point to close the first end point and the first connection point in a closed state at the time of restoration, and A second resistor connected in series with the first resistor in the closed state and connected in parallel to the first relay, and connected to the first electromagnet coil between the first end point and the second end point in the closed state during driving; A third relay, a fourth relay connected in series between the second end point and the second connection point, and closing the second end point and the second connection point in a closed state upon recovery, and a fourth relay; 5 is connected in series with the second resistor in a closed state at the time of recovery, is connected in parallel to the fourth relay, and is in a closed state at the time of driving. A sixth relay connecting the stone coil between the second end point and the fourth end point, and a third relay connected in series between the third end point and the third connection point, and closed in the closed state upon recovery; A seventh relay and an eighth relay for short-circuiting the end point and the third connection point, and connected in series with the third resistor in a closed state at the time of recovery and connected in parallel with the seventh relay to drive A ninth relay connecting the third electromagnet coil between the third end point and the fourth end point in a closed state, and between the first connection point and the second connection point in a closed state when restored A tenth relay connecting the fourth electromagnet coil and the fifth electromagnet coil 6 in series, a sixth electromagnet coil between the second junction point and the third junction point in the closed state at the time of restoration, and An eleventh relay for connecting the seventh electromagnet coil 4 in series, and a third connection point and a first connection in a closed state upon recovery. A twelfth relay that connects an eighth electromagnet coil and a ninth electromagnet coil 5 in series between the first and second points, and a series between the first end point and the fourth end point when the first relay is driven. A fourth resistor and a thirteenth relay connected to the first electromagnet coil for driving the thirteenth relay and the second relay; and a parallel connection to the fourth resistor when the first relay is driven. The thirteenth relay, which is closed when driven; a fifth resistor and a fourteenth relay connected in series between a second end point and a fourth end point when the fourth relay is driven; A second electromagnet coil that drives a fifth relay; a fourth relay that is connected in parallel to the fifth resistor when the fourth relay is driven, and is closed when driven; Connected in series between the third and fourth endpoints when driving the relay A sixth resistor and a third electromagnet coil that drives a fifteenth relay and an eighth relay, and a drive that is connected in parallel with the sixth resistor when the seventh relay is driven. The fifteenth relay in a closed state, the sixth electromagnet coil driving the relays 11 and 12, the eighth electromagnet coil driving the relays 21 and 22, the relays 31 and 32 The fourth electromagnet coil that drives the relay, the seventh electromagnet coil that drives the relay 40, the ninth electromagnet coil that drives the relay 50, and the fifth electromagnet that drives the relay 60 A feed line switching circuit for a submarine cable system, comprising: a coil;