WO2017141855A1 - 接地回路及び接地方法 - Google Patents
接地回路及び接地方法 Download PDFInfo
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- WO2017141855A1 WO2017141855A1 PCT/JP2017/005079 JP2017005079W WO2017141855A1 WO 2017141855 A1 WO2017141855 A1 WO 2017141855A1 JP 2017005079 W JP2017005079 W JP 2017005079W WO 2017141855 A1 WO2017141855 A1 WO 2017141855A1
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- Prior art keywords
- relay
- ground
- resistor
- power supply
- supply path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/806—Arrangements for feeding power
- H04B10/808—Electrical power feeding of an optical transmission system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H45/00—Details of relays
- H01H45/14—Terminal arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/44—Arrangements for feeding power to a repeater along the transmission line
Definitions
- the present invention relates to a grounding circuit and a grounding method, and more particularly to a grounding circuit and a grounding method used in a power feeding circuit for a submarine repeater.
- FIG. 11 is a diagram showing a connection between a submarine branching device (Branching Unit, hereinafter referred to as “BU”) and a land station related to the present invention.
- BU 901 is connected to land stations 991, 992, and 993 by a submarine cable including a power supply line, and switches a power supply circuit according to a signal received from any of land stations 991, 992, and 993.
- the power supply circuit of BU 901 is dropped to sea sea earth (Sea Earth; hereinafter referred to as “SE”) (right figure in FIG. 11), or the power supply circuit is disconnected from sea earth (left figure in FIG. 11). can do.
- SE sea sea earth
- FIG. 12 is a diagram illustrating an example of a power supply circuit of BU901.
- the internal circuit 910 includes an electric circuit that processes a transmitted optical signal.
- the power feeding circuit supplies power to the electric circuit.
- the power supply circuit of BU 901 includes three relays RL1 to RL3. By controlling the relays RL1 to RL3, the grounding state of the power supply circuit of the BU 901 to the SE can be switched.
- the left side of FIG. 12 shows a state where the internal circuit is disconnected from the sea earth, and the right side of FIG. 12 shows a state where the ground potential of the internal circuit is dropped to the sea earth.
- Patent Document 1 describes a technique related to power feeding switching of a submarine branching device.
- the submarine branching device 901 described in FIG. 12 has a problem that there is a conflicting request with respect to the resistance value of the resistor Rp. And patent document 1 does not describe the technique for solving such a subject.
- An object of the present invention is to provide a grounding circuit and a grounding method capable of achieving both suppression of a large current and suppression of arc discharge during hot switching.
- the ground circuit of the present invention is a ground circuit used for connecting a power feeding path to the ground, and includes a first relay, a second relay, a third relay, A first resistor connected in series with the first relay and capable of connecting the power supply path and the ground by the first relay; A voltage dividing means connected in series with the second relay and the third relay, and connectable to divide the voltage between the power supply path and the ground, The third relay is located at the point where the voltage is divided, When the power feeding path is connected to the ground, the power feeding path is connected to the ground via the first resistor by the first relay, and the voltage dividing means is the first relay and the first relay by the second and third relays.
- the first to third relays are controlled so that the connection to the first resistor is connected in parallel, and the connection to the ground by the first resistor is interrupted by the first relay, When the connection with the ground of the power feeding path is released, the first to third relays are controlled so that the ground current is interrupted by the third relay.
- the grounding method of the present invention is a grounding method for connecting a power feeding path to the ground, A first relay and a first resistor connected in series; Connecting the second relay, the voltage dividing means and the third relay in series; A third relay is arranged at a point where the voltage between the power supply path and the ground is divided by the voltage dividing means;
- the first relay connects the feed line to ground through a first resistor;
- a voltage dividing means connected in parallel with the first relay and the first resistor by the second and third relays; Only the connection with the ground by the first resistor is cut off by the first relay, Control the first through third relays, When disconnecting from the ground of the power supply path,
- the first to third relays are controlled so that the ground current is interrupted by the third relay. It is characterized by that.
- the program of the present invention is a control program used in a ground circuit having a function of connecting a power feeding path to the ground,
- the ground circuit A first resistor, a second relay, a third relay, a first resistor connected in series with the first relay and connected to the power supply path and the ground by the first relay;
- a voltage dividing means connected in series with the relay and the third relay and connectable so as to divide the voltage between the power supply path and the ground, and the third relay is arranged at a point to be divided.
- the control program is When the power feeding path is connected to the ground, the power feeding path is connected to the ground via the first resistor by the first relay, and the voltage dividing means is the first relay and the first relay by the second and third relays.
- a step of controlling the first to third relays such that the first relay is disconnected from the ground by the first resistor, and the connection to the ground by the first resistor is interrupted by the first relay;
- a procedure for controlling the first to third relays so that the ground current is interrupted by the third relay when the connection with the ground of the power feeding path is released; Is executed.
- the present invention makes it possible to achieve both suppression of a large current during hot switching and suppression of arc discharge.
- FIG. 1 is a block diagram illustrating a configuration example of a power feeding system 100 according to a first embodiment. It is a block diagram which shows the structural example for controlling relay with which BU101 is provided. It is a figure for demonstrating the structure of the electric power feeding circuit 301 of BU101. It is a figure which shows the example of the open / close state of a relay. It is a figure which shows the example of the open / close state of a relay. It is a figure which shows the example of the open / close state of a relay. It is a figure which shows the example of the open / close state of a relay. It is a figure which shows the example of the open / close state of a relay. It is a figure which shows the example of the open / close state of a relay. It is a figure which shows the example of the open / close state of a relay.
- FIG. 1 is a block diagram illustrating a configuration example of a power supply system 100 according to the first embodiment of the present invention.
- the power feeding system 100 includes a submarine branch device (BU) 101, land stations 111, 112, 113, and a control unit 121.
- the BU 101 is a device that branches a submarine cable, and is installed on the sea floor.
- the BU 101 and the land stations 111 to 113 are connected by a submarine cable, and data is transmitted between the land stations.
- the land stations 111 to 113 include a power supply device and a transmission device for the BU 101, and also have a function of monitoring and controlling the BU 101 by signals transmitted to and received from the BU 101.
- the land stations 111 to 113 notify the monitoring result of the BU 101 to the control unit 121 and transmit a signal for controlling the BU 101 notified from the control unit 121 to the BU 101.
- a workstation or a board computer may be used as the control unit 121.
- the control unit 121 monitors the power supply state of the BU 101 based on the monitoring results received from the land stations 111 to 113, and controls the power supply circuit of the BU 101.
- the control unit 121 generates a signal (relay control signal) including a command for switching a relay for switching the power feeding circuit included in the BU 101, and sends the command to the BU 101 via any of the land stations 111 to 113. Notice.
- the controller 121 may further have a function of monitoring the voltage potential of the power supply circuit of the BU 101.
- the BU 101 operates by power supply from at least one of the land stations 111 to 113. Further, the BU 101 controls the relay of the power feeding circuit by a relay control signal received from any of the land stations 111 to 113 via the submarine cable, thereby connecting the sea ground (SE) of the power feeding circuit (that is, A function of switching the grounding state).
- SE sea ground
- the switching of the grounding state of the feeder circuit is performed, for example, triggered by a failure of the feeder path between the BU 101 and the land stations 111 to 113 or construction of the submarine cable.
- the switching of the ground state of the power feeding circuit may be performed autonomously within the power feeding system 100 or may be performed based on an instruction from a maintenance person.
- FIG. 2 is a block diagram showing a configuration example for controlling the relay included in the BU 101.
- the BU 101 includes an optical coupler 211, an O / E (optical / electrical) converter 212, a relay control circuit 213, a relay drive circuit 214, and a relay 215.
- the relay 215 is a relay included in the power feeding circuit. In FIG. 2, only the configuration for the BU 101 to control the relay 215 in accordance with an instruction from the land station 111 is shown as an example.
- the relay 215 may be controlled by a signal received from a land station other than the land station 111.
- the BU 101 receives an optical signal including a relay control signal from the land station 111.
- the relay control signal is generated by the control unit 121.
- the optical coupler 211 branches the received optical signal and inputs one to the O / E converter 212.
- the other branched optical signal is transmitted to another BU or a land station by a relay function provided in the BU 101.
- the O / E converter 212 is an optical receiving circuit that converts the optical signal input from the optical coupler 211 into an electrical signal.
- the relay control circuit 213 regenerates the relay control signal based on the electrical signal output from the O / E converter 212.
- the relay control signal includes information on a relay 215 to be controlled and a control command to the relay 215 (for example, the relay contact is “open” or “closed”).
- the relay drive circuit 214 generates a signal having an amplitude that can drive the corresponding relay 215 based on the relay control signal.
- the relay 215 is a relay used for switching the power supply circuit of the BU 101, and the BU 101 may include a plurality of relays 215.
- FIG. 3 is a diagram for explaining the configuration of the power supply circuit 301 of the BU 101.
- the power feeding circuit 301 includes an internal circuit 311, a ground circuit 312, relays RL2 and RL3, and a resistor Rc.
- the power feeding circuit 301 supplies power to the internal circuit 311.
- the internal circuit 311 includes an electric circuit for realizing the function of the BU 101 and a power supply function unit for the electric circuit.
- the electric circuit included in the internal circuit 311 includes, for example, signals transmitted between the O / E converter 212, the relay control circuit 213, the relay drive circuit 214, and the land stations 111 to 113 shown in FIG. Signal) is an electric circuit used for relaying.
- the internal circuit 311 may be disposed inside the BU 101 and outside the power feeding circuit 301. Power is supplied to the internal circuit 311 from a power supply path connected to the terminals A, B, and C of the BU 101. Terminals A, B, and C are connected to land stations 111, 112, and 113 by submarine cables, respectively.
- the ground circuit 312 includes resistors Rh, Rm, and Rs, and relays RL1-1, RL1-2, and RL1-3.
- the resistor Rh has a larger resistance value than the resistors Rm and Rs.
- a hollow resistor or the like that can withstand large electric power is used.
- the resistor Rm is a resistor having an intermediate resistance value compared to the resistors Rh and Rs.
- the resistor Rs is a resistor having a small resistance value such as several ⁇ .
- the relationship between the resistance values of the resistors Rh, Rm, and Rs is Rh> Rm> Rs, and Rh> Rm + Rs.
- the power supply circuit 301 further includes relays RL2 and RL3 and a resistor Rc.
- the relay RL2 is closed when the power feeding path connected to the terminal A is connected to SE (Sea Earth).
- the relay RL3 is closed when the power feeding circuit connected to the terminal A or the terminal C is connected to the SE.
- the resistor Rc is a resistor having a medium resistance value, and is a protective resistor when the terminal A or the terminal C is connected to the SE.
- the internal circuit 311 is supplied with power from the power supply path connected to the terminals A and B, and the power supply path connected to the terminal C is always connected to the SE. Therefore, in this embodiment, the relay RL2 is always open and the relay RL3 is always closed.
- connection configuration of the relays RL2, RL3 and the resistor Rc is an example, and the configuration of the power feeding circuit 301 to which the ground circuit 312 is applied is not limited.
- a circuit for feeding or grounding connected to the terminal A and the terminal C a circuit having a different configuration can be used according to the specification of the feeding system 100 in which the BU 101 is used.
- Relays RL1-1, RL1-2, RL1-3, RL2, and RL3 correspond to the relay 215 shown in FIG. These relays operate independently based on a signal output from the relay drive circuit 214, and switch the connection state of the power feeding circuit 301 to the SE.
- FIG. 3 shows an initial state of the open / close state of the contact of each relay.
- 4 to 8 are diagrams showing examples of the open / closed state of the relay, and show an open / closed state different from FIG.
- FIG. 9 and FIG. 10 are flowcharts showing an example of the control procedure of each relay by the relay control circuit 213. Below, the procedure at the time of the relay control circuit 213 controlling each relay is demonstrated.
- the relay control circuit 213 controls each relay based on the relay control signal generated by the control unit 121.
- the relays RL1-1, RL1-2, and RL2 are open (non-conductive), and the relays RL1-3 and RL3 are closed (conductive).
- the BU 101 is supplied with power through a power supply path connected to the terminal A and a power supply path connected to the terminal B.
- the power supply path of terminal C is connected to SE.
- the internal circuit 311 is not connected to the SE. The subsequent operation may be performed when the control unit 121 illustrated in FIG. 1 detects that the power supply voltage of the internal circuit 311 is high (high potential).
- any of the land stations 111 to 113 that have received the relay control signal generated by the control unit 121 converts the relay control signal into an optical signal and transmits the optical signal to the BU 101.
- the relay control signal is transmitted through the submarine cable and reaches the BU 101.
- the O / E converter 212 converts the received optical signal into an electrical signal.
- the relay control circuit 213 outputs a signal to the relay drive circuit 214 so as to operate the corresponding relay according to the content of the relay control signal transmitted by the control unit 121.
- the relay drive circuit 214 controls the corresponding relay based on an instruction from the relay control circuit 213. By such a procedure, the relay in the BU 101 is switched by a relay control signal from the control unit 121.
- the relay control circuit 213 controls the relay RL1-1 to open the contact. (Step S02 in FIG. 9 and FIG. 4). As a result, a current flows through the resistor Rh, and the internal circuit 311 is connected to SE.
- the resistor Rh is a high resistance such as a hollow resistor, and can withstand hot switching from a high voltage even when the voltage of the power feeding circuit is high.
- the relay control circuit 213 closes the relay RL1-2 (step S03 and FIG. 5).
- the circuit in which resistance Rm and resistance Rs are connected in series is also connected to SE. That is, the current to the SE also flows through the combined resistance path of the resistors Rm and Rs.
- the relay control circuit 213 opens the relay RL1-1 after closing the relay RL1-2 (step S04 and FIG. 6). Opening relay RL1-1 prevents current from flowing to resistor Rh, thus reducing power consumption and heat generation when BU 101 is grounded to SE. By the procedure up to step S04, the connection operation of the ground circuit 312 to the SE is completed.
- relay control circuit 213 When canceling the grounding state to SE, relay control circuit 213 first opens relays RL1-3 and disconnects the power feeding circuit from SE (step S05 in FIG. 10 and FIG. 7).
- the resistance Rs between the relays RL1-3 and SE is a relatively small resistance (for example, several ⁇ ), and the voltage applied to the relays RL1-3 is divided by the resistance Rm and the resistance Rs. Pressed. For this reason, the voltage between SE and relay RL1-3 can be made small.
- the relay control circuit 213 opens the relay RL1-2 after opening the relay RL1-3 (step S06 and FIG. 8), and then further closes the relay RL1-3 (step S07).
- steps S06 and S07 the relays RL1-2 and RL1-3 are not energized. Therefore, in steps S06 and S07, there is no adverse effect on the relay contact due to a large current or arc discharge.
- the ground circuit 312 returns to the initial state of FIG.
- the ground circuit 312 of the present embodiment can achieve both suppression of a large current that occurs during grounding and suppression of arc discharge that occurs when the ground is released when the power supply of the BU 101 is switched.
- the power feeding circuit switching function provided in the BU 101 described in the first embodiment is also realized by the ground circuit 312 alone.
- the corresponding element symbols in FIGS. 3 to 8 are shown in parentheses.
- the operation procedure of the first to third relays (relays RL1-1 to RL1-3) is the same as that of the first embodiment.
- the ground circuit 312 is a ground circuit used for connecting the power feeding path to the ground (for example, SE).
- the ground circuit 312 includes a first relay (RL1-1), a second relay (RL1-2), a third relay (RL1-3), a first resistor (Rh), and voltage dividing means. (Rm and Rs).
- the first resistor is a resistor that is connected in series with the first relay and can be connected by the first relay so that the power supply path is connected to the ground.
- the voltage dividing means is connected in series with the second relay and the third relay.
- the voltage dividing means divides the voltage between the power feeding path and the ground, and the third relay is arranged at a point where the voltage is divided by the voltage dividing means.
- the first to third relays are controlled so that the circuits are connected as follows. First, the power supply path is grounded via the first resistor by the first relay. Thereafter, the voltage dividing means is connected in parallel with the first resistor by the second and third relays, and only the grounding by the first resistor is interrupted by the first relay.
- the first to third relays are controlled so that the grounding current is interrupted by the third relay.
- the first resistor having a high resistance value when connecting the power supply path to ground, first, only the first resistor having a high resistance value is grounded. After the potential of the power supply path is lowered by the grounding by the first resistor, the grounding by the voltage dividing circuit is further performed, and thereafter the grounding by the first resistor is interrupted.
- the voltage applied to the third relay is divided by the voltage dividing circuit connected in series between the power supply path and the ground. Therefore, since the voltage applied to the third relay is divided when the ground current is interrupted using the third relay, the occurrence of arc discharge that occurs when the ground is released can be suppressed. That is, the grounding circuit according to the second embodiment can both suppress the large current that occurs during grounding and suppress the arc discharge that occurs when the grounding is released.
- the ground circuit 312 includes the first to third relays (RL1-1 to RL1-3), the first resistor (Rh), the second resistor (Rm), and the third resistor (Rs). And comprising.
- One end of the first relay is connected to the power supply path, the other end of the first relay is connected to one end of the first resistor (Rh), and the other end of the first resistor is grounded.
- One end of the second relay is connected to the power supply path, and the other end of the second relay is connected to one end of the second resistor.
- the other end of the second resistor is connected to one end of the third relay, and the other end of the third relay is connected to one end of the third resistor.
- the other end of the third resistor is grounded.
- the second resistor and the third resistor are connected in series via a third relay. That is, it can be said that the second resistor and the third resistor can be referred to as a voltage dividing circuit that can be connected between the power feeding path and the ground.
- the voltage applied to the third relay is divided by the second resistor and the third resistor connected in series between the power feeding path and the ground. Therefore, since the voltage applied to the third relay is divided when the ground current is interrupted using the third relay, the occurrence of arc discharge that occurs when the ground is released can be suppressed. That is, the grounding circuit according to the modified example of the second embodiment can achieve both suppression of a large current that occurs during grounding and suppression of arc discharge that occurs when the grounding is released.
- the functions and procedures of the ground circuit 312 described in each of the above embodiments may be realized when the control unit 121 or the central processing unit (CPU) included in the relay control circuit 213 executes the program. Good.
- the program is recorded on a fixed, non-temporary recording medium.
- a semiconductor memory or a fixed magnetic disk device is used, but is not limited thereto.
- the CPU is, for example, a computer provided in the control unit 121 or the relay control circuit 213, but the arrangement of the CPU is not limited to these.
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Abstract
Description
本発明は、ホットスイッチングの際の、大電流の抑制とアーク放電の抑制とを両立させることが可能な接地回路及び接地方法を提供することを目的とする。
第1のリレーと直列に接続され第1のリレーによって給電路と接地とを接続可能な第1の抵抗と、
第2のリレー及び第3のリレーと直列に接続され、給電路と接地との間の電圧を分圧するように接続可能な分圧手段と、を備え、
第3のリレーは分圧される点に配置され、
給電路を接地と接続する際には、第1のリレーによって給電路が第1の抵抗を介して接地と接続され、第2及び第3のリレーによって分圧手段が第1のリレー及び第1の抵抗と並列に接続され、さらに、第1の抵抗による接地との接続が第1のリレーによって遮断される、ように第1乃至第3のリレーが制御され、
給電路の接地との接続を解除する際には、第3のリレーによって接地電流が遮断されるように第1乃至第3のリレーが制御される。
第1のリレーと第1の抵抗とを直列に接続し、
第2のリレーと分圧手段と第3のリレーとを直列に接続し、
給電路と接地との間の電圧が分圧手段により分圧される点に第3のリレーを配置し、
給電路を接地と接続する際には、
第1のリレーによって、第1の抵抗を介して給電路を接地と接続し、
第2及び第3のリレーによって、分圧手段を第1のリレー及び第1の抵抗と並列に接続し、さらに、
第1のリレーによって、第1の抵抗による接地との接続のみを遮断する、
ように第1乃至第3のリレーを制御し、
給電路の接地との接続を解除する際には、
第3のリレーによって接地電流を遮断する
ように第1乃至第3のリレーが制御される、
ことを特徴とする。
接地回路は、
第1のリレーと、第2のリレーと、第3のリレーと、第1のリレーと直列に接続され第1のリレーによって給電路と接地とを接続可能な第1の抵抗と、第2のリレー及び第3のリレーと直列に接続され、給電路と接地との間の電圧を分圧するように接続可能な分圧手段と、を備え、第3のリレーは分圧される点に配置され、
制御プログラムは、
給電路を接地と接続する際には、第1のリレーによって給電路が第1の抵抗を介して接地と接続され、第2及び第3のリレーによって分圧手段が第1のリレー及び第1の抵抗と並列に接続され、さらに、第1の抵抗による接地との接続が第1のリレーによって遮断される、ように第1乃至第3のリレーを制御する手順、
給電路の接地との接続を解除する際には、第3のリレーによって接地電流が遮断されるように第1乃至第3のリレーを制御する手順、
を実行させる。
図1は、本発明の第1の実施形態の給電システム100の構成例を示すブロック図である。図1において、給電システム100は、海底分岐装置(BU)101、陸上局111、112、113、及び制御部121を備える。BU101は、海底ケーブルを分岐する装置であり、海底に設置される。BU101と陸上局111~113とは海底ケーブルで接続され、各陸上局間でデータが伝送される。
図3~図10を用いて接地回路312の動作を説明する。図3は、各リレーの接点の開閉状態の初期状態を示す。図4~図8は、リレーの開閉状態の例を示す図であり、図3とは異なる開閉状態が示される。図9及び図10は、リレー制御回路213による各リレーの制御手順の例を示すフローチャートである。以下では、リレー制御回路213が各リレーを制御する際の手順について説明する。リレー制御回路213は、制御部121が生成したリレー制御信号に基づいて各リレーを制御する。
第1の実施形態で説明したBU101が備える給電回路の切り替え機能は、接地回路312単独によっても実現される。以下に、接地回路312の他の表現について記載する。第2の実施形態の説明において、対応する図3~図8の要素の記号を括弧内に示す。第1~第3のリレー(リレーRL1-1~RL1-3)の動作手順は、第1の実施形態と同様である。
接地回路312の構成及び動作は、さらに、以下のようにも記載されうる。すなわち、接地回路312は、第1乃至第3のリレー(RL1-1~RL1-3)と、第1の抵抗(Rh)と、第2の抵抗(Rm)と、第3の抵抗(Rs)と、を備える。第1のリレーの一端は給電路に接続され、第1のリレーの他端は第1の抵抗(Rh)の一端に接続され、第1の抵抗の他端は接地される。第2のリレーの一端は給電路に接続され、第2のリレーの他端は第2の抵抗の一端に接続される。第2の抵抗の他端は第3のリレーの一端に接続され、第3のリレーの他端は第3の抵抗の一端に接続される。第3の抵抗の他端は接地される。第2の抵抗と第3の抵抗とは、第3のリレーを介して直列に接続される。すなわち、第2の抵抗と第3の抵抗とは、給電路と接地との間に接続可能な分圧回路ということができる。
この出願は、2016年2月17日に出願された日本出願特願2016-028066を基礎とする優先権を主張し、その開示の全てをここに取り込む。
111~113 陸上局
121 制御部
211 光カプラ
212 O/Eコンバータ
213 リレー制御回路
214 リレー駆動回路
215 リレー
301 給電回路
311 内部回路
312 接地回路
901 海底分岐装置
910 内部回路
991~993 陸上局
Claims (8)
- 給電路を接地と接続するために用いられる接地回路であって、
第1のリレーと、第2のリレーと、第3のリレーと、
前記第1のリレーと直列に接続され前記第1のリレーによって前記給電路と前記接地とを接続可能な第1の抵抗と、
前記第2のリレー及び前記第3のリレーと直列に接続され、前記給電路と前記接地との間の電圧を分圧するように接続可能な分圧手段と、を備え、
前記第3のリレーは前記分圧される点に配置され、
前記給電路を前記接地と接続する際には、前記第1のリレーによって前記給電路が前記第1の抵抗を介して前記接地と接続され、前記第2及び第3のリレーによって前記分圧手段が前記第1のリレー及び前記第1の抵抗と並列に接続され、さらに、前記第1の抵抗による前記接地との接続が前記第1のリレーによって遮断される、ように前記第1乃至第3のリレーが制御され、
前記給電路の前記接地との接続を解除する際には、前記第3のリレーによって接地電流が遮断されるように前記第1乃至第3のリレーが制御される、
接地回路。 - 前記第1のリレーの一端は前記給電路に接続され、前記第1のリレーの他端は前記第1の抵抗の一端に接続され、前記第1の抵抗の他端は前記接地に接続され、
前記分圧手段は第2の抵抗及び第3の抵抗を備え、前記第2のリレーの一端は前記給電路に接続され、前記第2のリレーの他端は前記第2の抵抗の一端に接続され、前記第2の抵抗の他端は前記第3のリレーの一端に接続され、前記第3のリレーの他端は前記第3の抵抗の一端に接続され、前記第3の抵抗の他端は前記接地に接続される、
請求項1に記載された接地回路。 - 陸上局からの給電路をシーアースに接続して接地する機能を備える、請求項1又は2に記載された接地回路と、
前記陸上局からリレー制御信号を含む光信号を受信して電気信号に変換するO/E(optical/electrical)変換手段と、前記電気信号から前記リレー制御信号を再生するリレー制御手段と、前記リレー制御信号に基づいて前記接地回路が備えるリレーを駆動するリレー駆動手段と、
を備える海底分岐装置。 - 請求項3に記載された海底分岐装置と、
前記海底分岐装置が備える接地回路のリレーを制御するリレー制御信号を生成する制御装置と、
前記海底分岐装置と接続され、前記制御装置が生成した前記リレー制御信号を前記海底分岐装置に送信する陸上局と、を備える給電システム。 - 前記制御装置は、前記海底分岐装置の給電路の電圧ポテンシャルを検出する機能をさらに備え、前記電圧ポテンシャルが所定の値以上である場合に、前記第1乃至第3のリレーを制御する、請求項4に記載された給電システム。
- 給電路を接地と接続するための接地方法であって、
第1のリレーと第1の抵抗とを直列に接続し、
第2のリレーと分圧手段と第3のリレーとを直列に接続し、
前記給電路と前記接地との間の電圧が前記分圧手段により分圧される点に前記第3のリレーを配置し、
前記給電路を前記接地と接続する際には、
前記第1のリレーによって、前記第1の抵抗を介して前記給電路を前記接地と接続し、
前記第2及び第3のリレーによって、前記分圧手段を前記第1のリレー及び前記第1の抵抗と並列に接続し、さらに、
前記第1のリレーによって、前記第1の抵抗による前記接地との接続のみを遮断する、
ように前記第1乃至第3のリレーを制御し、
前記給電路の前記接地との接続を解除する際には、
前記第3のリレーによって接地電流を遮断する
ように前記第1乃至第3のリレーが制御される、
ことを特徴とする接地方法。 - 前記第1のリレーの一端を前記給電路に接続し、前記第1のリレーの他端を前記第1の抵抗の一端に接続し、前記第1の抵抗の他端を前記接地と接続し、
前記分圧手段は第2の抵抗及び第3の抵抗を備え、前記第2のリレーの一端を前記給電路に接続し、前記第2のリレーの他端を前記第2の抵抗の一端に接続し、前記第2の抵抗の他端を前記第3のリレーの一端に接続し、前記第3のリレーの他端を前記第3の抵抗の一端に接続し、前記第3の抵抗の他端を前記接地と接続する、
請求項6に記載された接地方法。 - 給電路を接地と接続する機能を備える接地回路で用いられるコンピュータの制御プログラムを記録した記録媒体であって、
前記接地回路は、
第1のリレーと、第2のリレーと、第3のリレーと、前記第1のリレーと直列に接続され前記第1のリレーによって前記給電路と前記接地とを接続可能な第1の抵抗と、前記第2のリレー及び前記第3のリレーと直列に接続され、前記給電路と前記接地との間の電圧を分圧するように接続可能な分圧手段と、を備え、前記第3のリレーは前記分圧される点に配置され、
前記制御プログラムは、前記コンピュータに、
前記給電路を前記接地と接続する際には、前記第1のリレーによって前記給電路が前記第1の抵抗を介して前記接地と接続され、前記第2及び第3のリレーによって前記分圧手段が前記第1のリレー及び前記第1の抵抗と並列に接続され、さらに、前記第1の抵抗による前記接地との接続が前記第1のリレーによって遮断される、ように前記第1乃至第3のリレーを制御する手順、
前記給電路の前記接地との接続を解除する際には、前記第3のリレーによって接地電流が遮断されるように前記第1乃至第3のリレーを制御する手順、
を実行させる。
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