Power supply system, shutdown control method

Abstract

The purpose of the present disclosure is to inhibit the manufacturing costs of and realize a relative size reduction in a circuit breaker in a power supply system.　Therefore, the present disclosure relates to a power supply system having a first circuit breaker, a second circuit breaker, and a control terminal that remotely controls the first circuit breaker and the second circuit breaker, the power supply system being characterized in that: the control terminal transmits an open signal indicating the opening of the first circuit breaker to the first circuit breaker and the second circuit breaker; the first circuit breaker awaits the elapse of a first time on the basis of the open signal; the second circuit breaker changes to a setting for inhibiting an opening operation of the second circuit breaker during the first time and awaits the elapse of a second time on the basis of the open signal; the first circuit breaker opens an electric path in the first circuit breaker during the second time; and the second circuit breaker returns the changed setting to the original setting after the elapse of the second time.

Description

[Technical Field]

[0001] This disclosure relates to a technology for preventing malfunctions caused by switching noise in a power supply system. [Background technology]

[0002] Conventional DC circuit breaker systems consist of a combination of independent unidirectional DC circuit breakers. When one of the DC circuit breakers operates, the resulting noise can cause other circuit breakers to malfunction. Therefore, noise countermeasures were implemented by incorporating noise-reducing filters (common normal chokes, common chokes) into the circuit breakers (Non-Patent Literature 1). [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Noise characteristics of circuit breakers in DC power supply systems<https: / / www.jstage.jst.go.jp / article / jceeek / 2008 / 0 / 2008_0_491 / _pdf> [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2008-288845 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, adding a physical noise reduction filter to a circuit breaker, as in conventional technology, requires the addition and modification of hardware, which increases the manufacturing cost of the circuit breaker and makes it difficult to miniaturize the circuit breaker.

[0006] This invention was made to solve the above-mentioned problems, and aims to reduce the manufacturing cost of circuit breakers and achieve relatively small size. [Means for solving the problem]

[0007] To solve the above problems, the invention according to claim 1 is a power supply system having a first circuit breaker, a second circuit breaker, and a control terminal for remotely controlling the first circuit breaker and the second circuit breaker, wherein the control terminal transmits an open signal to the first circuit breaker and the second circuit breaker indicating the opening of the first circuit breaker; the first circuit breaker waits for a first time based on the open signal; the second circuit breaker changes its setting to suppress the opening operation of the second circuit breaker during the first time based on the open signal and waits for a second time to elapse; the first circuit breaker opens the circuit of the first circuit breaker during the second time; and the second circuit breaker returns the changed setting to its original state after the second time has elapsed. [Effects of the Invention]

[0008] As described above, the present invention has the effect of reducing the manufacturing cost of circuit breakers and achieving relatively miniaturization. [Brief explanation of the drawing]

[0009] [Figure 1] This is an overall configuration diagram of the power supply system of this embodiment. [Figure 2] This is a diagram showing the configuration of the control terminal and each circuit breaker in the power supply system of this embodiment. [Figure 3] This is a sequence diagram illustrating the operation of each circuit breaker when the circuit of circuit breaker 5b is opened based on a signal from a control terminal, according to the first embodiment. [Figure 4] This is a conceptual diagram illustrating the situation in which the supply of current to building B is interrupted, relating to the first embodiment. [Figure 5] This figure shows an example of changing the settings of the control unit. [Figure 6]It is a sequence diagram showing the operations of each circuit breaker when the circuit of circuit breaker 5c is turned on based on a signal from a control terminal, according to the second embodiment. [Figure 7] It is a conceptual diagram showing the situation where the supply of current to Building C is started, according to the second embodiment. [Figure 8] It is a sequence diagram showing the operations of circuit breaker 5c and other circuit breakers when the circuit of circuit breaker 5c is opened, according to the third embodiment. [Figure 9] It is a conceptual diagram showing the situation where a short circuit occurs in branch line 6a connected to Building A and the supply of current to Building A is stopped, according to the third embodiment.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0011] 〔System Configuration of Embodiment〕 First, the overall configuration of the power supply system 1 of the present embodiment will be described using FIG. 1. FIG. 1 is an overall configuration diagram of the power supply system according to the present embodiment.

[0012] As shown in FIG. 1, the power supply system 1 of the present embodiment is constructed by a control terminal 3 and a plurality of circuit breakers 5a, 5b, 5c, 5x. Incidentally, the general term for circuit breakers 5a, 5b, 5c, 5x is shown as "circuit breaker 5".

[0013] As shown in FIG. 1, an electric wire 6 is connected from the power supply source Building X to each of the power supply destination Buildings A, B, and C. The electric wire 6 is composed of a main line 6x on the side of Building X and respective branch lines 6a, 6b, 6c on the sides of Buildings A, B, and C. Further, the branch lines 6a, 6b, 6c branch in parallel from a branch point 6p. <00系列の番号を変えることはできません。

[0014] <00系列の番号を変えることはできません。 The circuit breaker 5x is provided in the trunk line 6x section and can cut off the current supplied from Building X. The circuit breaker 5a is provided in the branch line 6a section and can cut off the current supplied to Building A. The circuit breaker 5b is provided in the branch line 6b section and can cut off the current supplied to Building B. The circuit breaker 5c is provided in the branch line 6c section and can cut off the current supplied to Building C. In FIG. 1, three circuit breakers 5a, 5b, and 5c are shown on the supply destination side, but two or more, or even four or more, may be provided.

[0015] The control terminal 3 and the circuit breaker 5 can communicate via the communication line 9. Note that communication may be performed by wireless communication instead of the communication line 9. The communication line 9 is an example of a communication network, and communication networks include the Internet, LAN (Local Area Network), etc. A part of the communication network may perform wireless communication.

[0016] The control terminal 3 is composed of one or more computers. When the control terminal 3 is composed of a plurality of computers, it may be referred to as the "control terminal" or the "control system". The control terminal 3 is managed and used by the user. The control terminal 3 can remotely control the circuit breaker 5 via the communication line 9.

[0017] 〔Configuration of Each Component of the System〕 Subsequently, the configuration of the control terminal and each circuit breaker in the power supply system of the present embodiment will be described using FIG. 2. FIG. 2 is a configuration diagram of the control terminal and each circuit breaker in the power supply system of the present embodiment.

[0018] <Configuration of the Control Terminal> As shown in FIG. 2, the control terminal 3 has a communication unit 31 and a control unit 33.

[0019] The communication unit 31 communicates with the circuit breaker 5 via the communication line 9.

[0020] The control unit 33 consists of a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory) 303, and SSD (Solid State Drive), and remotely controls the circuit breaker 5. Note that an HDD (Hard Disk Drive) may be used instead of the SSD.

[0021] <Circuit breaker configuration> The circuit breaker 5 is capable of interrupting bidirectional current, and its settings (interruption threshold, operating time, and enabling or disabling the interruption operation) can be changed depending on the magnitude and direction of the current.

[0022] Therefore, as shown in Figure 2, the circuit breaker 5x has a communication unit 51x, a control unit 53x, a current sensor 55x, a measurement unit 57x, and a cutting unit 59x.

[0023] Of these, the communication unit 51x can communicate with the control terminal 3 and other circuit breakers 5 (in this case, other than circuit breaker 5x) via signals through the communication line 9. When the communication unit 51x receives an open signal or closed signal for a circuit breaker from another circuit breaker 5 (in this case, other than circuit breaker 5x) or the control terminal 3, it outputs an open signal or closed signal to the control unit 53x. Also, when the communication unit 51x receives an open signal or closed signal for a circuit breaker from the control unit 53x, it transmits an open signal or closed signal for a circuit breaker to the other circuit breaker 5 (in this case, other than circuit breaker 5x).

[0024] The control unit 53x determines whether each circuit breaker 5 is open (OFF) or closed (ON) based on the circuit breaker open or closed signal input from the communication unit 51x or the measurement unit 57x, and outputs the circuit breaker open or closed signal to the communication unit 51x and the circuit breaker unit 59x. In addition, when the control unit 53x receives an open or closed signal for another circuit breaker 5 (in this case, a circuit breaker other than circuit breaker 5x) from the communication unit 51x, it changes the settings related to its own opening operation.

[0025] The current sensor 55x outputs a signal to the measurement unit 57x that is proportional to the current value of the circuit in which the circuit breaker 5x is installed.

[0026] The measurement unit 57x receives a signal proportional to the current from the current sensor 55x and outputs an open signal or an closed signal for the circuit breaker to the control unit 53x.

[0027] The circuit breaker 59x is a circuit that opens and closes the power line. It opens (OFF) the power line (contact) of the power line 6 in response to an open signal from the control unit 53x, and closes (ON) the power line (contact) of the power line 6 in response to an close signal from the control unit 53x.

[0028] Similarly, circuit breaker 5a has a communication unit 51a, a control unit 53a, a current sensor 55a, a measurement unit 57a, and a cutting unit 59a. Circuit breaker 5b has a communication unit 51b, a control unit 53b, a current sensor 55b, a measurement unit 57b, and a cutting unit 59b. Circuit breaker 5c has a communication unit 51c, a control unit 53c, a current sensor 55c, a measurement unit 57c, and a cutting unit 59c. The communication units 51a, 51b, 51c, control units 53a, 53b, 53c, current sensors 55a, 55b, 55c, measurement units 57a, 57b, 57c, and interruption units 59a, 59b, 59c have the same configuration as the communication unit 51x, control unit 53x, current sensor 55x, measurement unit 57x, and interruption unit 59x, respectively, so their explanation is omitted.

[0029] [Processing or operation of the embodiment] Next, the processing or operation of this embodiment will be described.

[0030] ●First Embodiment First, we will explain how to open circuit breaker 5b using Figures 3 to 5.

[0031] Figure 3 is a sequence diagram showing the operation of each circuit breaker when the circuit of circuit breaker 5b is opened based on a signal from the control terminal, according to the first embodiment. Figure 4 is a conceptual diagram showing the situation when the supply of current to building B is interrupted, according to the first embodiment. Initially, as shown in Figure 4, circuit breakers 5x, 5a, and 5b are in the closed state, and circuit breaker 5c is in the open state.

[0032] S11: The communication unit 31 of the control terminal 3 transmits an open signal to the circuit breaker 5b (an example of a first circuit breaker) via the communication line 9, in response to a command from the control unit 33, indicating that the circuit breaker 5b is open. As a result, the communication unit 51b receives the open signal indicating that the circuit breaker 5b is open.

[0033] S12: The communication unit 31 of the control terminal 3, upon receiving a command from the control unit 33, transmits an open signal indicating the opening of circuit breaker 5b to the circuit breakers 5x, 5a, and 5c (an example of a second circuit breaker) via the communication line 9. As a result, each communication unit 51x, 51a, and 51c receives the open signal indicating the opening of circuit breaker 5b.

[0034] S13: In circuit breaker 5b, the control unit 53b receives an open signal from the communication unit 51b indicating that circuit breaker 5b is open, and after a certain period of time T 11 Wait for [s] to elapse.

[0035] S14: In circuit breaker 5x, the control unit 53x receives an open signal from the communication unit 51x indicating that circuit breaker 5b is open, and after a certain period of time T 11During [s], the settings related to the opening operation of circuit breaker 5x are changed. This allows circuit breaker 5x to prepare for the switching noise n of circuit breaker 5b. Figure 5 shows an example of setting changes in the control unit. As shown in Figure 5, the control unit 53x disables the opening operation by the interruption unit 59x. Alternatively, even if the control unit 53x does not disable it, it makes it more difficult to open by significantly changing the interruption threshold, significantly changing the operation time, and increasing the number of judgments. That is, in Figure 5, the control unit 53x changes the settings to suppress the opening operation of circuit breaker 5x by changing the settings using No. 1 or a combination of No. 2 to No. 4. In addition, circuit breakers 5a and 5c also prepare for the switching noise n of circuit breaker 5b by performing the same operation as circuit breaker 5x.

[0036] Furthermore, increasing the tripping threshold makes it more difficult for the control unit 53x to initiate an opening operation on the tripping unit 59x. Increasing the operation time also makes it more difficult for the control unit 53x to initiate an opening operation on the tripping unit 59x. Increasing the number of judgments allows the control unit 53x to increase the number of times it determines whether each circuit breaker 5 is open (OFF) or closed (ON) based on the open or closed signal of the circuit breaker input from the measurement unit 57x, thereby enabling faster situation determination.

[0037] S15: Each circuit breaker 5x, 5a, 5c will operate for a certain period of time T 12 Wait for [s] to elapse.

[0038] S16: In circuit breaker 5b, a certain time T 12 During [s], the circuit breaker 59b opens (turns off) the circuit (contact) of the branch line 6b in response to the opening signal from the control unit 53b. As a result, as shown in Figure 4, opening and closing noise n is generated in the circuit breaker 5b, but malfunctions of the other circuit breakers 5x, 5a, and 5c can be prevented.

[0039] S17: Each circuit breaker 5x has a certain time T 12 After [s] has elapsed, the control unit 53x resets the settings shown in Figure 5. Similarly, the circuit breakers 5a and 5c also reset the settings shown in Figure 5 by performing the same operation as the circuit breaker 5x.

[0040] ●Second Embodiment Next, the closing of circuit breaker 5c will be explained using Figures 5 to 7. Figure 6 is a sequence diagram showing the operation of each circuit breaker when the circuit of circuit breaker 5c is closed based on a signal from the control terminal, according to the second embodiment. Figure 7 is a conceptual diagram showing the situation in which the supply of current c to building C is started, according to the second embodiment. Initially, as shown in Figure 7, circuit breakers 5x and 5a are in the closed state, and circuit breakers 5b and 5c are in the open state.

[0041] S21: The communication unit 31 of the control terminal 3 transmits a closing signal to the circuit breaker 5c (an example of a first circuit breaker) via the communication line 9, in response to a command from the control unit 33, indicating that the circuit breaker 5c is closed. As a result, the communication unit 51c receives the closing signal indicating that the circuit breaker 5c is closed.

[0042] S22: The communication unit 31 of the control terminal 3, upon receiving a command from the control unit 33, transmits a closing signal to the circuit breakers 5x, 5a, and 5b (an example of a second circuit breaker) via the communication line 9, indicating that circuit breaker 5c is closed. As a result, each communication unit 51x, 51a, and 51b receives the closing signal indicating that circuit breaker 5c is closed.

[0043] S23: In circuit breaker 5c, the control unit 53c receives a closing signal from the communication unit 51c indicating that circuit breaker 5c is closed, and after a certain period of time T 21 Wait for [s] to elapse.

[0044] S24: In circuit breaker 5x, the control unit 53x receives a closing signal from the communication unit 51x indicating that circuit breaker 5c is closed, and after a certain period of time T 21 During [s], the setting for the opening operation of circuit breaker 5x is changed. The content of this setting change is the same as in the first embodiment (see Figure 5). As a result, circuit breaker 5x is protected from the switching noise n of circuit breaker 5c. In addition, circuit breakers 5a and 5b also protect from the switching noise n of circuit breaker 5c by performing the same operation as circuit breaker 5x.

[0045] S25: Each circuit breaker 5x, 5a, 5b will operate for a certain period of time T 22 Wait for [s] to elapse.

[0046] S26: In the circuit breaker 5c, during a certain period of time T 22 [s], the blocking unit 59c turns on (closes) the circuit (contact point) of the branch line 6c according to the input signal from the control unit 53c. As a result, as shown in FIG. 7, switching noise n occurs in the circuit breaker 5c, but malfunction with respect to other circuit breakers 5x, 5a, and 5b can be prevented.

[0047] S27: In each circuit breaker 5x, after a certain period of time T 22 [s] has elapsed, the control unit 53x restores the setting change shown in FIG. 5. Also, in the circuit breakers 5a and 5c, by performing the same operation as the circuit breaker 5x, the setting change shown in FIG. 5 is restored.

[0048] ● Third Embodiment Subsequently, with reference to FIGS. 5, 8, and 9, the release of the circuit breaker 5a by detecting an overcurrent (large current) will be described. FIG. 8 is a sequence diagram showing the operations of the circuit breaker 5c and other circuit breakers when the circuit of the circuit breaker 5c is released, according to the third embodiment. FIG. 9 is a conceptual diagram showing a situation where a short circuit occurs in the branch line 6a connected to Building A and the supply of current c to Building A is stopped, according to the third embodiment. In the initial state, as shown in FIG. 9, all the circuit breakers �x, 5a, 5b, and 5c are in the ON state.

[0049] S31: In the circuit breaker 5a, the measurement unit 57a measures the current value by the current sensor 55a, and the control unit 53a detects that an overcurrent (large current) has occurred in the circuit breaker 5a.

[0050] S32: The communication unit 51a transmits a release signal indicating the release of the circuit breaker sa to the other circuit breakers 5x, 5b, and 5c via the communication line 9 according to an instruction from the control unit 53a. As a result, each communication unit 51x, 51b, and 51c receives the release signal indicating the release of the circuit breaker 5a.

[0051] S33: In the circuit breaker 5a, the control unit 53a waits for a certain period of time t1 [s] to elapse.

[0052] S34: In circuit breaker 5x, the control unit 53x receives an opening signal from the communication unit 51x indicating that circuit breaker 5a is open, and changes the setting related to the opening operation of circuit breaker 5x within a certain time t1 [s]. The content of this setting change is the same as in the first embodiment (see Figure 5). As a result, circuit breaker 5x is protected from the switching noise n of circuit breaker 5a. Similarly, circuit breakers 5b and 5c are also protected from the switching noise n of circuit breaker 5a by performing the same operation as circuit breaker 5x.

[0053] S35: Each circuit breaker 5x, 5b, and 5c waits for a certain time t2[s] to elapse.

[0054] S36: In circuit breaker 5a, during a certain time t2[s], the interruption unit 59a opens (turns off) the circuit (contact) of branch line 6a in response to an opening signal from the control unit 53a. As a result, as shown in Figure 9, switching noise n is generated in circuit breaker 5a, but malfunctions of the other circuit breakers 5x, 5b, and 5c can be prevented.

[0055] S37: In each circuit breaker 5x, after a certain time t2[s] has elapsed, the control unit 53x resets the settings changed in Figure 5. Similarly, in circuit breakers 5b and 5c, the same operation as in circuit breaker 5x is performed to reset the settings changed in Figure 5.

[0056] (modified version) In addition, although the opening of the circuit was described in the third embodiment, the closing of the circuit is also described. A similar situation exists. For example, when the circuit breaker 5a is closed to connect to the load on the building A side. In this case, in process S32, closing information is transmitted, and in process S36, the circuit breaker 59a closes the circuit.

[0057] [Main effects of the embodiment] As explained above, according to this embodiment, since each circuit breaker is configured to communicate with other circuit breakers, malfunctions due to noise can be prevented by software measures such as notifying other circuit breakers in advance of the timing of tripping, disabling the opening or closing operation for a certain period of time, changing the tripping threshold, and setting the operation time limit and the number of judgments. This has the effect of suppressing the manufacturing cost of circuit breakers and enabling relatively miniaturization. [Explanation of Symbols]

[0058] 1. Power supply system 3. Control terminal 5,5a,5b,5c,5x circuit breaker 6 electric wire 6a, 6b, 6c branch lines 6x main lines 9. Communication lines 51,51a,51b,51c,51d Communication Department 53, 53a, 53b, 53c, 53d Control Unit 55, 55a, 55b, 55c, 55d Current Sensor 57, 57a, 57b, 57c, 57d Measurement section 59, 59a, 59b, 59c, 59d Interruption section

Claims

1. A power supply system having a first circuit breaker, a second circuit breaker, and a control terminal for remotely controlling the first and second circuit breakers, The control terminal transmits an open signal to the first circuit breaker and the second circuit breaker, indicating that the first circuit breaker is open. The first circuit breaker waits for a first time to elapse based on the opening signal, Based on the opening signal, the second circuit breaker is changed to a setting that suppresses the opening operation of the second circuit breaker during the first time period, and waits for the second time period to elapse. During the second time period, the first circuit breaker opens the circuit of the first circuit breaker. The second circuit breaker, after the second time has elapsed, restores the changed setting to its original state. A power supply system characterized by the following features.

2. A power supply system having a first circuit breaker, a second circuit breaker, and a control terminal for remotely controlling the first and second circuit breakers, The control terminal transmits a closing signal to the first circuit breaker and the second circuit breaker, indicating that the first circuit breaker is closed. The first circuit breaker waits for a first time to elapse based on the closing signal, Based on the closing signal, the second circuit breaker changes its setting to suppress the opening operation during the first time period, and waits for the second time period to elapse. During the second time period, the first circuit breaker closes its circuit. The second circuit breaker, after the second time has elapsed, restores the changed setting to its original state. A power supply system characterized by the following features.

3. A power supply system having a first circuit breaker and a second circuit breaker, The first circuit breaker transmits an open signal to the second circuit breaker indicating that the first circuit breaker is open. The first circuit breaker waits for the first time to elapse, Based on the opening signal, the second circuit breaker is changed to a setting that suppresses the opening operation of the second circuit breaker during the first time period, and waits for the second time period to elapse. During the second time period, the first circuit breaker opens the circuit of the first circuit breaker. The second circuit breaker, after the second time has elapsed, restores the changed setting to its original state. A power supply system characterized by the following features.

4. A power supply system having a first circuit breaker and a second circuit breaker, The first circuit breaker transmits a closing signal to the second circuit breaker indicating that the first circuit breaker is closed. The first circuit breaker waits for the first time to elapse, Based on the closing signal, the second circuit breaker changes its setting to suppress the opening operation during the first time period, and waits for the second time period to elapse. During the second time period, the first circuit breaker closes its circuit. The second circuit breaker, after the second time has elapsed, restores the changed setting to its original state. A power supply system characterized by the following features.

5. A method for controlling circuit breakers performed by a power supply system having a first circuit breaker, a second circuit breaker, and a control terminal for remotely controlling the first and second circuit breakers, The control terminal transmits an open signal to the first circuit breaker and the second circuit breaker, indicating that the first circuit breaker is open. The first circuit breaker waits for a first time to elapse based on the opening signal, Based on the opening signal, the second circuit breaker is changed to a setting that suppresses the opening operation of the second circuit breaker during the first time period, and waits for the second time period to elapse. During the second time period, the first circuit breaker opens the circuit of the first circuit breaker. The second circuit breaker, after the second time has elapsed, restores the changed setting to its original state. A method for controlling circuit breakers, characterized by the features described above.

6. A method for controlling circuit breakers performed by a power supply system having a first circuit breaker, a second circuit breaker, and a control terminal for remotely controlling the first and second circuit breakers, The control terminal transmits a closing signal to the first circuit breaker and the second circuit breaker, indicating that the first circuit breaker is closed. The first circuit breaker waits for a first time to elapse based on the closing signal, Based on the closing signal, the second circuit breaker changes its setting to suppress the opening operation during the first time period, and waits for the second time period to elapse. During the second time period, the first circuit breaker closes its circuit. The second circuit breaker, after the second time has elapsed, restores the changed setting to its original state. A method for controlling circuit breakers, characterized by the features described above.

7. A method for controlling circuit breakers performed by a power supply system having a first circuit breaker and a second circuit breaker, The first circuit breaker transmits an open signal to the second circuit breaker indicating that the first circuit breaker is open. The first circuit breaker waits for the first time to elapse, Based on the opening signal, the second circuit breaker is changed to a setting that suppresses the opening operation of the second circuit breaker during the first time period, and waits for the second time period to elapse. During the second time period, the first circuit breaker opens the circuit of the first circuit breaker. The second circuit breaker, after the second time has elapsed, restores the changed setting to its original state. A method for controlling circuit breakers, characterized by the features described above.

8. A method for controlling circuit breakers performed by a power supply system having a first circuit breaker and a second circuit breaker, The first circuit breaker transmits a closing signal to the second circuit breaker indicating that the first circuit breaker is closed. The first circuit breaker waits for the first time to elapse, Based on the closing signal, the second circuit breaker changes its setting to suppress the opening operation during the first time period, and waits for the second time period to elapse. During the second time period, the first circuit breaker closes its circuit. The second circuit breaker, after the second time has elapsed, restores the changed setting to its original state. A method for controlling circuit breakers, characterized by the features described above.

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