JP7422335B2 - Detection systems, circuit breakers and distribution boards - Google Patents

Description

The present disclosure relates to a detection system, a circuit breaker, and a distribution board, and more particularly, to a detection system, a circuit breaker, and a distribution board for detecting power restoration of a power system.

Patent Document 1 describes a circuit switching device in which a control means detects power restoration based on a signal from a current transformer provided on the secondary side of the circuit breaker and switches the circuit breaker. .

Japanese Patent Application Publication No. 2010-187514

However, in the electric circuit switching device of Patent Document 1, since the control means operates based on the current on the secondary side of the circuit breaker, it is difficult to detect power restoration in a state where the contacts of the electric circuit are open.

An object of the present disclosure is to provide a detection system, a circuit breaker, and a distribution board that can detect power restoration of a power system while the contacts of the electrical circuit are open.

A detection system according to one aspect of the present disclosure is used for a circuit breaker. The circuit breaker opens and closes contacts between a primary circuit and a secondary circuit. A system voltage based on power from a power grid is applied to the primary side electric circuit, and a load is connected to the secondary side electric circuit. The detection system includes a detection electrode, a ground electrode, a voltage detection section, and a battery. The detection electrode is arranged in the vicinity of the primary circuit in a state where it is not in electrical contact with the primary circuit, and the ground electrode is grounded. The voltage detection section detects the voltage between the detection electrode and the ground electrode by connecting the voltage between the detection electrode and the ground electrode to a voltage between the detection electrode and the ground electrode through capacitive coupling between the primary side electric path and the detection electrode. Detection is based on the current flowing through the The battery supplies power to at least drive the voltage detection section.

A circuit breaker according to one aspect of the present disclosure includes the detection system.

A distribution board according to one aspect of the present disclosure includes the circuit breaker.

The detection system, circuit breaker, and distribution board of the present disclosure have the advantage of being able to detect power restoration of the power system in a state where the contacts of the electric circuit are open.

FIG. 1 is a block diagram of a detection system and a circuit breaker using the detection system according to an embodiment of the present disclosure. FIG. 2 is a block diagram illustrating a configuration example of a voltage detection section included in the above detection system. FIG. 3 is a front view showing the appearance of a distribution board equipped with the same circuit breaker as above. FIG. 4 is a front view showing the inside of the above circuit breaker. FIG. 5 is a flowchart showing a state determination process performed by the detection system as described above. FIG. 6 is a block diagram showing a first modification of the above detection system. FIG. 7 is a block diagram illustrating a configuration example of a voltage detection section included in the detection system of Modification 1. FIG. 8 is a block diagram showing a second modification of the above detection system. FIG. 9 is a flowchart showing the state determination process performed by the detection system of Modification 2.

Each of the figures described in the following embodiments is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual size ratio. Note that the configuration described in the embodiments below is only an example of the present disclosure. The present disclosure is not limited to the following embodiments, and various changes can be made depending on the design etc. as long as the effects of the present disclosure can be achieved.

(1) Embodiment 1
Embodiment 1 of the present disclosure is a detection system that detects power restoration of a power system.

(1-1) Usage environment of detection system The detection system according to Embodiment 1 of the present disclosure is used in the circuit breaker shown in FIG. In the first embodiment, the circuit breaker in FIG. 1 is the master breaker 101 that constitutes the distribution board 100 shown in FIG. 3, and will be referred to as "breaker 101" below.

(1-1-1) Circuit breaker The circuit breaker 101 is provided in the electric circuit 10 and opens and closes the contact H of the electric circuit 10.

The circuit breaker 101 includes, for example, an earth leakage detection circuit and an opening/closing mechanism (both not shown). The earth leakage detection circuit is provided in the secondary electric circuit 10B and detects electric leakage occurring in the electric circuit 10. The opening/closing mechanism includes a tripping coil placed near the contact H and a drive circuit that drives the tripping coil, and drives the tripping coil via the drive circuit when the leakage detection circuit detects a leakage. This opens contact H. Further, it is preferable that the opening/closing mechanism further includes an overcurrent detection circuit, so that the contact H is tripped even when an overcurrent (an overload current or a short circuit current) flows.

The opening/closing mechanism further includes a handle operated by the user, and can close the open contact H or open the closed contact H according to the operation of the handle.

Moreover, the circuit breaker 101 has a housing 101a as shown in FIG. The earth leakage detection circuit and opening/closing mechanism described above are housed in the housing 101a. Further, an electric path 10 (a first electric path L1, a second electric path L2, and a third electric path N), which will be described later, penetrates the housing 101a.

The housing 101a is made of, for example, synthetic resin. However, the housing 101a may be formed of a metal other than iron, a conducting wire member such as carbon resin, or may be formed of an insulating member such as plastic.

(1-1-1a) Modified example of circuit breaker The circuit breaker in this modified example is the limiter 103 that constitutes the distribution board 100 shown in FIG. 3, and will be referred to as "breaker 103." The circuit breaker 103 operates in response to the total value of the first current flowing through the first electrical circuit L1 and the second current flowing through the second electrical circuit L2 reaching or exceeding a predetermined upper limit. , the contact H is opened to cut off the first current and the second current.

Note that in the following description, "breaker 101" and "casing 101a of circuit breaker 101" can be read as "breaker 103" and "casing (not shown) of circuit breaker 103" in modified examples.

(1-1-2) Electrical line The electric line 10 is a single-phase three-wire electric line, and includes a first electric line L1, a second electric line L2, and a third electric line N. The first electric path L1, the second electric path L2, and the third electric path N correspond to an L1 phase voltage side line, an L2 phase voltage side line, and a neutral line, respectively, which constitute a single-phase three-wire type electric line.

The electrical circuit 10 is divided into a primary electrical circuit 10A and a secondary electrical circuit 10B via a contact H. A system voltage based on power from the power system is applied to the primary side electric circuit 10A. The grid voltage is usually an alternating current voltage of 100V or 200V. A load is connected to the secondary circuit 10B. The load is, for example, an electrical device such as a personal computer (PC) or a microwave oven.

The contacts H include a first contact H1, a second contact H2, and a third contact HN. Contact H is opened and closed manually or automatically.

The first electric path L1 is divided into a primary side first electric path L11 and a secondary side first electric path L12 via the first contact H1.

The second electric path L2 is divided into a primary side second electric path L21 and a secondary side second electric path L22 via the second contact H2.

The third electric path N is divided into a primary side third electric path N1 and a secondary side third electric path N2 via the third contact HN.

(1-2) Detection System The detection system of Embodiment 1 is used in the circuit breaker 101, and enables detection of power restoration in the power system while the contact H of the circuit breaker 101 is open.

Specifically, the detection system includes a detection device 1, a first detection electrode 11A, and a ground electrode 12, as shown in FIG.

The detection device 1 includes, for example, a processor, a memory, a display, a speaker, a communication module (all not shown), and the like. A program and various types of information are stored in the memory, and the processor operates based on the program and various types of information in the memory, thereby realizing the functions of the state determination section 14 and the like, which will be described later. The functions of the output unit 15, which will be described later, are realized by a display, a speaker, a communication module, and the like.

Note that the processor and memory that implement the functions of the state determination unit 14 and the like may be referred to as a "computer". Further, when simply referred to as "memory" below, it is usually the memory of the detection device 1, but it may also be the memory of an external device, and the location of the memory does not matter as long as it can be accessed by the processor.

(1-2-1) Electrode The first detection electrode 11A is arranged in the vicinity of the first primary circuit L11 constituting the primary circuit 10A in a state of no electrical contact with the first primary circuit L11. Ru.

The term "nearby" as used herein refers to a distance where insulation between the first detection electrode 11A and the primary-side first electric circuit L11 can be achieved and voltage measurement can be performed without contact.

11 A of 1st detection electrodes in this Embodiment 1 are provided in the housing|casing 101a of the circuit breaker 101. The first detection electrode 11A is, for example, a conductive plate embedded in the casing 101a of the circuit breaker 101, as shown in FIG.

Note that the first detection electrode 11A is usually embedded in the wall surface (any one or more of the left side, right side, upper side, lower side, front surface, and rear surface) of the housing 101a. is insert molded.

However, embedding may also mean, for example, that a recess corresponding to the first detection electrode 11A is formed on the wall surface of the housing 101a, and the first detection electrode 11A is fitted into the recess. Alternatively, being embedded may mean that the wall surface of the casing 101a has a double structure, and the first detection electrode 11A is inserted into the gap between the inner wall and the outer wall that constitute the wall surface, or the first detection electrode 11A may be inserted between the wall surface and the outer wall. 1 detection electrode 11A may be formed integrally, and the form does not matter.

A conductive plate is a member formed into a plate shape using a conductive material. The conductive material is, for example, iron, but may also be a metal other than iron or an alloy containing two or more metals.

This makes it possible to simplify the configuration and improve detection accuracy.

Note that the first detection electrode 11A in FIG. 4 has a thickness smaller than that of the housing 101a and is entirely embedded in the housing 101a; It may be thicker than that. A portion of the first detection electrode 11A, which is thicker than the thickness of the casing 101a, is embedded in the casing 101a, and the remaining portion is exposed from the casing 101a.

In the case 101a of FIG. 4, since the first electric path L1 (primary side first electric path L11) exists near the left side wall and above, the first detection electrode 11A is embedded in the left side wall. However, in the case 101a, since the first electric path L1 (primary side first electric path L11) is also close to the upper wall, the first detection electrode 11A may be embedded in the left side of the upper wall. The first detection electrode 11A may be provided anywhere as long as it is near the first electric path L1 (primary first electric path L11).

Further, the plate-shaped first detection electrode 11A does not necessarily have to be embedded, and may be attached to the surface of the housing 101a, for example. The surface here is, for example, the outer surface, but may be the inner surface as long as the first detection electrode 11A can be insulated from the first electric circuit L1 (primary first electric circuit L11).

Further, the shape of the first detection electrode 11A is not limited to a plate shape, but may be any shape such as a rod shape or a tablet shape. In addition, it is suitable that 11 A of rod-shaped 1st detection electrodes are provided in the housing|casing 101a in parallel with the 1st electric path L1 (primary side 1st electric path L11).

Furthermore, the first detection electrode 11A does not necessarily need to be provided in the housing 101a itself, and may be provided inside the housing 101a and in the vicinity of the first electric circuit L1 (primary side first electric circuit L11), for example. It may be provided at a location away from the housing 101a or outside the housing 101a.

The ground electrode 12 is grounded, for example, via a ground terminal block (not shown) provided in the cabinet of the distribution board 100.

(1-2-2) Detection Device The detection device 1 of the first embodiment includes a voltage detection section 13, a state determination section 14, an output section 15, and a battery 16, as shown in FIG. Note that, although the aforementioned electrodes are not included in the detection device 1 in this embodiment, at least one of the detection electrode 11 and the ground electrode 12 may be included in the detection device 1.

The voltage detection unit 13 detects a voltage (hereinafter referred to as "first voltage") between the primary side first electric circuit L11 and the primary side third electric circuit N1 that constitute the primary side electric circuit 10A through the first detection electrode 11A. Detection is performed by contact, and a first voltage value indicating the detection result is acquired.

Since the first voltage is equal to the voltage between the first detection electrode 11A and the ground electrode 12, the voltage detection section 13 detects the voltage between the first detection electrode 11A and the ground electrode 12. , the voltage of the primary-side first electric circuit L11 can be detected without contact.

The voltage detection unit 13 in the first embodiment has a current ( The first voltage between the first detection electrode 11A and the ground electrode 12 is detected based on the first current (hereinafter referred to as "first current").

Specifically, the voltage detection unit 13 adjusts the voltage applied to the first detection electrode 11A (hereinafter referred to as "first applied voltage") so that the first current becomes zero, and the first current becomes zero. Obtain the voltage value of the first voltage at the time.

Specifically, as shown in FIG. 2, the voltage detection unit 13 includes, for example, a first voltage application circuit 131A that applies a voltage to the first detection electrode 11A, and a first detection electrode 11A and a ground electrode 12. A first galvanometer 132A detects a first current flowing in an electric path between the first galvanometer 132A, and a first voltage application circuit 131A applies a first voltage to the first detection electrode 11A based on the detection result of the first galvanometer 132A. The first control circuit 133A controls the voltage.

The voltage detection unit 13 controls the first voltage application circuit 131A via the first control circuit 133A so that the detection result of the first galvanometer 132A becomes 0, and when the detection result is 0, the first voltage application circuit 131A Voltage is measured and a first voltage value indicating the measurement result is obtained.

The first voltage value thus obtained is delivered to the state determining section 14. The acquired first voltage value is also normally delivered to the output section 15.

The state determination unit 14 determines whether the power system is in a energized state or a power outage state based on the detection result of the voltage detection unit 13 (in the first embodiment, the first voltage value), and provides state information indicating the determination result. get.

The state determining unit 14 determines that the power system is in an energized state if the first voltage value is larger than the threshold value, and determines that the power system is in a power outage state if the first voltage value is smaller than the threshold value. do.

Note that the threshold value is, for example, "0", but may be a value larger than 0. When the threshold value is “0”, the state determining unit 14 determines that the power system is in the energized state if “first voltage value>0”, and if “first voltage value = 0”, the power system is in the energized state. It is determined that the grid is in a power outage state.

The state determining unit 14 retains the acquired state information in memory. The acquired status information is normally delivered to the output unit 15.

Further, the state determination unit 14 acquires power restoration information in response to a change from a power outage state to an energized state, and delivers the acquired power restoration information to the output unit 15. Power restoration information is information indicating power restoration of the power system. The power restoration information is, for example, a character string such as "power has been restored," but may also be an image such as a symbol mark that means power restoration.

Specifically, the state determination unit 14 compares the currently acquired state information with the previously acquired state information and determines whether the power outage state has changed to the energized state. Then, the state determination unit 14 acquires power restoration information when the power outage state changes to the energized state, and delivers it to the output unit 15 .

(1-2-3) Voltage information The output unit 15 outputs voltage information. The voltage information is information regarding the detection result of the voltage detection unit 13. The voltage information is, for example, a first voltage value, status information, power restoration information, etc., but is not limited thereto.

Output includes, for example, display on a display, audio output from a speaker, transmission to an external device, etc., but is not limited thereto. The display is, for example, a liquid crystal display provided on the cover (not shown) of the electricity distribution board 100, but it may also be a monitor external to the electricity distribution board 100, and its type and location are not limited. The speaker is, for example, a built-in speaker in the distribution board 100, but may also be a speaker on an external monitor, and its type and location are not limited. The external device is, for example, a mobile communication terminal such as a smartphone, but may also be an information appliance with a communication function, and its type and location are not limited.

The output unit 15 outputs voltage information including the first voltage value acquired by the voltage detection unit 13. In this way, by outputting the voltage information including the first voltage value, it becomes possible for the user to recognize that the power has been restored to the power system.

The output unit 15 may output voltage information including the state information acquired by the state determination unit 14 in addition to or in place of the first voltage value. In this way, by outputting voltage information including status information, it becomes possible for the user to accurately recognize when power is restored to the power system.

The output unit 15 outputs voltage information including the power restoration information in response to the state determination unit 14 acquiring the power restoration information. The voltage information including power restoration information may further include a first voltage value. In this way, by outputting voltage information including power restoration information in response to a change from a power outage state to an energized state, it is possible to explicitly make the user aware of the power restoration of the power system.

In particular, by having the output unit 15 transmit voltage information to an external device, even a user located far away from the circuit breaker 101 can be made aware of power restoration.

The battery 16 supplies power for driving the voltage detection section 13, state determination section 14, and output section 15 that constitute the detection device 1.

The battery 16 is normally disposable, but may be rechargeable. The rechargeable battery 16 is charged with power from the secondary circuit 10B.

In this way, the detection device 1 is electrically insulated from at least the primary electric circuit 10A and operates on the power of the battery 16, so that it is possible to detect power restoration of the power system even when the contact H of the electric circuit 10 is open. Also, even if a short circuit or the like occurs, it is protected from overcurrent.

(1-2-4) State Determination Process The state determination unit 14 in the first embodiment executes a process (state determination process) according to the flowchart shown in FIG. Note that this process is started when the power of the detection device 1 is turned on, and is ended when the power of the detection device 1 is turned off.

The state determining unit 14 determines whether the primary voltage detected by the voltage detecting unit 13 is greater than 0 (step S11). Note that the primary voltage in the first embodiment is the first voltage. If the primary voltage is 0, the state determination unit 14 determines that the power system is under power outage, and sets state information indicating that the power outage is under way in "state" (step S13).

Here, "state" is a variable indicating acquired state information. When setting the acquired state information (current state information) to the "state", the state determining unit 14 holds in the memory the state information (previous state information) that was previously set to the "state". After executing step S12, the process returns to step S11.

If the primary side voltage is greater than 0, the state determining unit 14 sets state information indicating that the power is being energized in "state" (step S13). Next, the state determination unit 14 compares the state information set in the "state" with the previous state information in the memory to determine whether the "state" has changed from power outage to power on. Determination is made (step S14).

When the "state" changes from power outage to energized, the state determination unit 14 determines that the power system has been restored, acquires power restoration information, and delivers it to the output unit 15 (step S15). After that, the process returns to step S11.

(1-3) Modification example 1 of detection system
As shown in FIG. 6, the detection system of Modification 1 includes a detection device 1, a first detection electrode 11A, a second detection electrode 11B, and a ground electrode 12. The detection device 1 includes a voltage detection section 13, a state determination section 14, an output section 15, and a battery 16, like the detection device 1 in the first embodiment (see FIG. 1).

That is, the detection system of Modification 1 is the detection system of Embodiment 1 shown in FIG. 1 to which the second detection electrode 11B is added. Note that the basic operations of each component other than the second detection electrode 11B are the same as those in the detection system of the first embodiment, and only the operations that are different from those of the first embodiment will be described below.

(1-3-1) Electrode in Modification 1 The second detection electrode 11B is arranged in the vicinity of the primary-side second electric path L21 in a state of no electrical contact with the primary-side second electric path L21.

The second detection electrode 11B in Modification 1 is provided in the housing 101a of the circuit breaker 101, like the first detection electrode 11A. The second detection electrode 11B is, for example, a conductive plate embedded in the housing 101a of the circuit breaker 101.

In the casing 101a of FIG. 4, the second electric circuit L2 (primary-side second electric circuit 21) is present near the upper part of the right side wall, so the second detection electrode 11B is embedded in the right side wall. However, in the casing 101a, since the second electric path L2 (primary-side second electric path 21) is also close to the upper wall, the second detection electrode 11B may be embedded on the right side of the upper wall. The second detection electrode 11B may be provided anywhere as long as it is near the second electric path L2 (primary second electric path 21).

Further, the plate-shaped second detection electrode 11B does not necessarily have to be embedded, and may be attached to the surface of the housing 101a, for example.

Further, the shape of the second detection electrode 11B is not limited to a plate shape, but may be any shape such as a rod shape or a tablet shape. Note that the rod-shaped second detection electrode 11B is preferably provided in the housing 101a in parallel with the second electric path L2 (primary side second electric path 21).

Further, the second detection electrode 11B does not necessarily need to be provided in the housing 101a itself, and may be provided inside the housing 101a and in the vicinity of the second electric path L2 (primary side second electric path 21), for example. It may be provided at a location away from the housing 101a or outside the housing 101a.

(1-3-2) Detection device in modification 1 As described above, in addition to the operation of detecting the first voltage and acquiring the first voltage value, the voltage detection unit 13 detects the primary The voltage of the side second electric circuit L21 and the primary side third electric circuit N1 (hereinafter referred to as "second voltage") is detected in a non-contact manner via the second detection electrode 11B, and a second voltage value indicating the detection result is obtained. Do the following actions.

Since the second voltage is equal to the voltage between the second detection electrode 11B and the ground electrode 12, the voltage detection unit 13 detects the voltage between the second detection electrode 11B and the ground electrode 12. , the voltage of the second electric circuit L2 can be detected without contact.

The voltage detection unit 13 in the present modification 1 has a current ( A second voltage between the second detection electrode 11B and the ground electrode 12 is detected based on the second current (hereinafter referred to as "second current").

The voltage detection unit 13 adjusts the voltage applied to the second detection electrode 11B (hereinafter referred to as "second applied voltage") so that the second current becomes 0, and the voltage detected when the first current becomes 0. Obtain the voltage values of two voltages.

For example, as shown in FIG. 7, the voltage detection unit 13 includes, in addition to a first voltage application circuit 131A, a first galvanometer 132A, and a first control circuit 133A, a first voltage application circuit that applies a voltage to the second detection electrode 11B. Based on the detection results of the two-voltage application circuit 131B, the second galvanometer 132B that detects the second current flowing in the electrical path between the second detection electrode 11B and the ground electrode 12, and the second galvanometer 132B. It further includes a second control circuit 133B that controls the second voltage applied to the second detection electrode 11B of the second voltage application circuit 131B.

The voltage detection unit 13 controls the second voltage application circuit 131B via the second control circuit 133B so that the detection result of the second galvanometer 132B becomes 0, and when the detection result is 0, the second voltage application circuit 131B Voltage is measured and a second voltage value indicating the measurement result is obtained.

The second voltage value thus obtained is delivered to the state determination unit 14 together with the first voltage value. Note that the second voltage value is normally delivered to the output section 15 together with the first voltage value.

The state determination unit 14 determines whether the first voltage that constitutes the grid voltage is in an energized state or a power outage state based on the first voltage value, and acquires state information regarding the first voltage (first state information). Further, the state determination unit 14 determines whether the second voltage that constitutes the grid voltage is in a energized state or a power outage state based on the second voltage value, and acquires state information regarding the second voltage (second state information). .

If the first voltage value is larger than the threshold value (for example, "first voltage value > 0"), the state determination unit 14 determines that the first voltage constituting the grid voltage is in the energized state; If the value is equal to or less than the threshold (for example, "first voltage value = 0"), it is determined that the first voltage is in a power outage state, and the first state information indicating the determination result ("energized state" or "power outage state") get. Further, if the second voltage value is larger than the threshold value (for example, “second voltage value>0”), the state determination unit 14 determines that the second voltage that constitutes the grid voltage is in the energized state, and the second If the voltage value is less than or equal to the threshold value (for example, "second voltage value = 0"), the second voltage is determined to be in a power outage state, and a second state indicating the determination result ("energized state" or "power outage state") Get information. The first state information and second state information thus obtained are delivered to the output unit 15.

In addition, the state determination unit 14 acquires first power restoration information indicating power restoration of the first voltage in response to a change in the first voltage from a power outage state to a energized state, and uses the acquired first power restoration information. It is delivered to the output section 15. Further, the state determination unit 14 acquires second power restoration information indicating power restoration of the second voltage in response to a change in the second voltage from a power outage state to a energized state, and uses the acquired second power restoration information. It is delivered to the output section 15.

The output unit 15 outputs voltage information including the first voltage value and the second voltage value acquired by the voltage detection unit 13.

In this way, by outputting voltage information that further includes the second voltage value, it becomes possible for the user to recognize the restoration of each of the first voltage and second voltage (L1 phase and L2 phase) that constitute the grid voltage.

In addition to the first voltage value and the second voltage value acquired by the voltage detection unit 13, or in place of the first voltage value and the second voltage value, the output unit 15 outputs the first voltage value acquired by the state determination unit 14. Voltage information including state information and second state information may be output.

In this way, by outputting the voltage information including the first state information and the second state information, it becomes possible for the user to recognize the restoration of each of the first voltage and the second voltage.

The output unit 15 includes the acquired one or two pieces of power restoration information in response to the state determination unit 14 acquiring at least one of the first power restoration information and the second power restoration information. Voltage information may also be output. The voltage information including one or two pieces of power restoration information may further include a first voltage value and a second voltage value.

In this way, by outputting voltage information that includes one or two pieces of power restoration information, it is possible to explicitly make the user aware of the power restoration of at least one of the first voltage and second voltage that constitute the grid voltage. .

For example, by outputting voltage information including two pieces of power restoration information, it is possible to make the user aware of the complete power restoration of the grid voltage.

Further, by outputting voltage information including one piece of power restoration information, it is possible to make the user aware of partial power restoration of the grid voltage. In that case, it is preferable that the voltage information further includes circuit identification information that identifies the circuit to which the power has been restored. The electrical circuit identification information may be, for example, the name of the electrical circuit, the name of the load connected to the electrical circuit, or the name of the location where the load is installed, but any information that can identify the electrical circuit may be used. . This allows the user to recognize which electric path has been restored.

(1-3-3) State determination processing in modification 1 The state determination unit 14 in modification 1 executes state determination processing according to the flowchart of FIG. 5 for each electrical circuit.

That is, regarding the first electric path L1, the voltage detection unit 13 detects the first voltage via the first detection electrode 11A, and the state determination unit 14 determines that the first voltage is the primary voltage in step S11, as shown in FIG. Execute the status determination process.

Further, regarding the second electric path L2, the voltage detection unit 13 detects a second voltage via the second detection electrode 11B, and the state determination unit 14 sets the second voltage as the primary voltage in step S11, as shown in FIG. Execute the status determination process.

Note that the above two state determination processes may be executed by one processor in a time-sharing manner, or may be executed in parallel by two processors.

According to modification example 1, by arranging the first detection electrode 11A and the second detection electrode 11B in the primary side first electric path L11 and the primary side second electric path L21, respectively, the primary side Can detect voltage.

(1-4) Modification example 2 of detection system
As shown in FIG. 8, the detection system of Modification 2 includes a detection device 1, a first detection electrode 11A, a ground electrode 12, and a secondary voltage detection section 17. The detection device 1 includes a voltage detection section 13, a state determination section 14, an output section 15, and a battery 16, like the detection device 1 in Embodiment 1 (see FIG. 1).

That is, the detection system of the present modification 2 is the detection system of the first embodiment shown in FIG. 1 in which the secondary voltage detection section 17 is added.

(1-4-1) Detection of secondary voltage The secondary voltage detection unit 17 detects the voltage (secondary voltage) of the secondary circuit 10B. The secondary voltage of this modification 2 is the voltage between the secondary side first electric circuit L12 and the secondary side second electric circuit L22 (hereinafter referred to as "third voltage").

That is, the secondary voltage detection unit 17 is connected to the first secondary electric path L12 and the second secondary electric path L22, and detects the third voltage.

(1-4-2) Detection Device in Modification Example 2 The operation of each element constituting the detection device 1 in Modification Example 2 is the same as that in the detection system of Embodiment 1, except for the following.

The state determining unit 14 determines the voltage of the secondary circuit 10B (hereinafter referred to as "secondary voltage") when the handle is NO, and the voltage of the primary circuit 10A (hereinafter referred to as "primary voltage") when the handle is OFF. ”), it is determined whether the power system is in an energized state or in a power outage state.

When the handle is NO, it usually means that the first contact H1 is between the primary side first electric circuit L11 and the secondary side first electric circuit L12, and the first contact H1 is between the primary side second electric circuit L21 and the secondary side second electric circuit L22. This is a case where the second contact H2 and the third contact HN between the primary side third electric path N1 and the secondary side third electric path N2 are all closed, but the third contact HN may be open.

The case where the handle is OFF usually means that the first contact H1, the second contact H2, and the third contact HN are all open, but the third contact HN may be closed.

The secondary voltage is usually the voltage between the first secondary electrical circuit L12 and the second secondary electrical circuit L22 (hereinafter referred to as "third voltage"). However, the secondary voltage may be, for example, the voltage between the secondary side first electric circuit L12 and the secondary side third electric circuit N2, or the voltage between the secondary side second electric circuit L22 and the secondary side third electric circuit N2. It does not matter if the voltage is between.

In response to whether the handle is turned ON or OFF, a signal indicating "ON" or "OFF" is transmitted from the handle to the state determination unit 14.

The state determining unit 14 determines whether the handle is ON or OFF based on the above signal, and when the handle is ON (for example, the first contact H1 and the second contact H2 are closed), the second contact H1 and the second contact H2 are closed. It is further determined whether the next voltage (for example, the third voltage) is greater than the threshold value. Then, if the secondary voltage is higher than the threshold (for example, "third voltage>0"), the state determination unit 14 determines that the grid voltage is in the energized state, and the secondary voltage is equal to or lower than the threshold (for example, "third voltage>0"). If “third voltage=0”), it is determined that the power system is in a power outage state.

When the handle is OFF (for example, the first contact H1 and the second contact H2 are open), the state determination unit 14 determines whether the primary voltage (for example, the first voltage) is greater than the threshold value. Further judgment. Then, when the primary voltage is higher than the threshold value (for example, "first voltage>0"), the state determining unit 14 determines that the power system is in the energized state. On the other hand, if the primary voltage is below the threshold value (for example, "first voltage=0"), the state determining unit 14 determines that the power system is in a power outage state.

(1-4-3) State determination processing in modification 2 The state determination unit 14 in modification 2 executes processing (state determination processing) according to the flowchart shown in FIG. Note that the flowchart in FIG. 9 is obtained by adding the following two steps S10a and S10b to the flowchart in FIG.

The state determining unit 14 determines whether the handle is ON (the first contact H1, the second contact H2, and the third contact HN are closed) (step S10a). If the handle is OFF, the process advances to step S11.

When the handle is ON, the state determining unit 14 determines whether the secondary voltage (third voltage) detected by the secondary voltage detecting unit 17 is greater than 0 (step S10b). If the secondary voltage (third voltage) is 0, the process proceeds to step S12. If the secondary voltage (third voltage) is greater than 0, the process proceeds to step S13.

According to the second modification, it is possible to accurately determine whether the power is on or the power is out, based on the ON/OFF of the handle, the primary voltage (first voltage), and the secondary voltage (third voltage).

(1-5) Modification example 3 of detection system
The detection system of Modification 3 (not shown) is the detection system of Modification 2 (see FIG. 8), in which the second detection electrode 11B (not shown) described in Modification 1 is replaced with the first detection electrode 11A. (see FIG. 6).

The voltage detection unit 13 detects the second voltage via the second detection electrode 11B instead of detecting the first voltage via the first detection electrode 11A. The primary voltage referred to by the state determining unit 14 when the handle is OFF is the second voltage.

That is, in step S11 of FIG. 9, it is determined whether the second voltage is larger than the threshold value (second voltage>0). If the second voltage is greater than the threshold, it is determined that the power system is in a power-on state, and if the primary voltage is below the threshold (second voltage = 0), it is determined that the power system is in a power outage state. be done.

According to the third modification, it is possible to accurately determine whether the power is on or the power is out, based on the ON/OFF of the handle, the primary voltage (second voltage), and the secondary voltage (third voltage).

(1-6) Modification example 4 of detection system
The detection system of Modification 4 is the same as the detection system of Modification 2 (see FIG. 8), further including a second detection electrode 11B. The voltage detection unit 13 further detects a second voltage in addition to the first voltage. The primary voltages referred to by the state determining unit 14 when the handle is OFF are the first voltage and the second voltage.

That is, in step S11 of FIG. 9, first, it is determined whether the first voltage is larger than a threshold value (first voltage>0). If the first voltage is greater than the threshold, the L1 phase that makes up the grid voltage is determined to be in the energized state, and if the first voltage is less than the threshold (first voltage = 0), the L1 phase is out of power. It is determined that the state is

Next, it is determined whether the second voltage is greater than the threshold (second voltage>0). If the second voltage is greater than the threshold, the L2 phase that makes up the grid voltage is determined to be in a energized state, and if the second voltage is less than the threshold (second voltage = 0), the L2 phase is out of power. It is determined that the state is

In this way, it is determined whether each phase of L1 and L2 that constitutes the grid voltage is in a power outage state or an energized state, and state information indicating the determination result is acquired. The output unit 15 outputs voltage information including the two state information obtained in this way (that is, the first state information regarding the L1 phase and the second state information regarding the L2 phase).

In addition, the state determination unit 14 determines whether or not the power outage state has changed to the energized state for each phase of L1 and L2, and in accordance with the change from the power outage state to the energized state, voltage information including power restoration information get. The output unit 15 outputs voltage information including the first power recovery information when the first power recovery information regarding the L1 phase is acquired, and outputs the voltage information including the third power recovery information when the second power recovery information regarding the L2 phase is acquired. Outputs voltage information including electrical information.

According to the fourth modification, it is possible for the user to recognize the power restoration of the power system for each phase of L1 and L2.

As described above, according to the first embodiment, the voltage detection unit 13 driven by the battery 16 detects the voltage of the primary side electric circuit 10A (primary side first electric circuit L11, primary side second electric circuit L21) in a non-contact manner. Since the detection is performed using the detection electrodes 11 (first detection electrode 11A, second detection electrode 11B), the power system can be restored even when the contact H of the electric circuit 10 is open (for example, in a steering wheel trip state due to an earthquake). A detection system is realized that allows the detection of.

If the circuit switching device of Patent Document 1 is configured to operate based on the current on the primary side of the circuit breaker, it would be easy to protect the control means from overcurrent when a short circuit or leakage occurs. Not.

On the other hand, since the detection system of the first embodiment is electrically insulated from the primary circuit 10A, it is protected from overcurrent when a short circuit or the like occurs.

(2) Embodiment 2
Embodiment 2 of the present disclosure is a circuit breaker 101 including the detection system of Embodiment 1, as shown in FIG. This circuit breaker 101 is a master breaker 101 that constitutes the distribution board 100 shown in FIG.

However, in the second embodiment, the circuit breaker 103 described in "Modification of circuit breaker" may be used. This circuit breaker 103 is a limiter 103 that constitutes the distribution board 100.

Note that the circuit breaker 101 (103) in FIG. 1 is intended for a single-phase three-wire electric circuit 10, but in the second embodiment, the circuit breaker (103) is for a single-phase two-wire electric circuit (not shown). ) may also be used. The single-phase two-wire electric line is the electric line 10 excluding the second electric line L2. A circuit breaker intended for a single-phase two-wire electric circuit opens and closes a first contact H1 interposed in the first electric circuit L1 and a third contact HN interposed in the third electric circuit N.

According to the second embodiment, a circuit breaker (main breaker 101, limiter 103) is realized.

(3) Embodiment 3
Embodiment 3 of the present disclosure is a distribution board 100 including a master breaker 101 corresponding to the circuit breaker 101 of Embodiment 2, as shown in FIG. This distribution board 100 further includes a plurality of branch breakers 102 and a limiter 103. Note that the number of branch breakers 102 may be one. Further, the electricity distribution board 100 does not need to include the limiter 103.

However, in the distribution board 100 of FIG. 3, the master breaker 101 does not correspond to the circuit breaker 101 of the second embodiment, and the limiter 103 may correspond to the circuit breaker 103 described in "Modification of circuit breaker". .

According to Embodiment 3, the distribution board 100 is realized, which enables detection of power restoration of the power system in a state where the contact H of the electric circuit 10 is open, and which is protected from overcurrent when a short circuit or the like occurs. Ru.

(4) Summary The detection system according to the first aspect of the present disclosure is used in a circuit breaker (101). The circuit breaker (101) has a primary side electric circuit (10A: primary side first electric circuit L11, primary side second electric circuit L21) and a secondary side electric circuit (10B: secondary side first electric circuit L12, secondary side second electric circuit). L22) (H: first contact H1, second contact H2) is opened and closed. A system voltage based on power from the power grid is applied to the primary side electric circuit (10A: L11, L21), and a load is connected to the secondary side electric circuit (10B: L21, L22).

The detection system includes detection electrodes (11:11A, 11B), a ground electrode (12), a voltage detection section (13), and a battery (16). The detection electrodes (11: 11A, 11B) are arranged in the vicinity of the primary circuit (10A: L11, L21) without electrically contacting the primary circuit (10A: L11, L21). The ground electrode (12) is grounded. The voltage detection unit (13) detects the voltage between the detection electrodes (11: 11A, 11B) and the ground electrode (12) between the primary circuit (10A: L11, L21) and the detection electrodes. Detection is performed based on the current flowing in the electrical path between the detection electrode (11:11A, 11B) and the ground electrode (12) due to capacitive coupling with (11A, 11B). The battery (16) supplies power to at least drive the voltage detection section (13).

According to this aspect, the battery-driven voltage detection unit detects the voltage of the primary circuit with the non-contact detection electrode, so even if the contact of the circuit is open (for example, when the handle is tripped due to an earthquake), A detection system is realized that enables detection of power restoration in a power system and is protected from overcurrent in the event of a short circuit or the like.

In the detection system according to the second aspect, in the first aspect, the detection electrodes (11:11A, 11B) are conductive plates provided in the case (101a) of the circuit breaker (101).

According to this aspect, since the detection electrode is a conductive plate provided in the casing, it is possible to simplify the configuration and improve detection accuracy.

In the detection system according to the third aspect, in the second aspect, the primary electric circuit (10A: L11, L21) includes a first primary electric circuit (L11) and a second primary electric circuit (L21). The detection electrodes (11:11A, 11B) include a first detection electrode (11A) and a second detection electrode (11B). The first detection electrode (11A) is arranged in the vicinity of the primary-side first electric circuit (L11) in a state in which it is not electrically in contact with the primary-side first electric circuit (L11). The second detection electrode (11B) is arranged in the vicinity of the primary-side second electric path (L21) in a state in which it is not electrically in contact with the primary-side second electric path (L21). The voltage detection section (13) detects a first voltage and a second voltage. The first voltage is the voltage between the first detection electrode (11A) and the ground electrode (12). The second voltage is the voltage between the second detection electrode (11B) and the ground electrode (12).

According to this aspect, by arranging the detection electrode on the primary side of each electric path, it is possible to detect the voltage on the primary side for each electric path.

The detection system according to the fourth aspect further includes an output section (15) in any one of the first to third aspects. The output section (15) outputs voltage information regarding the detection result of the voltage detection section (13).

According to this aspect, the detection result can be notified to the user by outputting the voltage information.

In the detection system according to the fifth aspect, in the fourth aspect, the output section (15) transmits the voltage information to an external device.

According to this aspect, voltage information can be notified even to a user who is located away from the circuit breaker.

The detection system according to the sixth aspect further includes a state determining section (14) in the fourth or fifth aspect. A state determining unit (14) determines whether the power system is in an energized state or a power outage state based on the detection result of the voltage detecting unit (13). Further, the state determining unit (14) delivers power restoration information indicating power restoration of the power system to the output unit (15) in accordance with the change from the power outage state to the energized state. The output unit (15) outputs voltage information including the power restoration information.

According to this aspect, by transmitting power restoration information in response to a change from a power outage state to an energized state, it is possible to make the user aware of power restoration.

In the detection system according to the seventh aspect, in the sixth aspect, the primary electric circuit (10A: L11, L21) includes a first primary electric circuit (L11) and a second primary electric circuit (L21). The secondary electric circuit (10B: L12, L22) includes a first secondary electric circuit (L12) and a second secondary electric circuit (L22). The detection electrodes (11:11A, 11B) include at least one of a first detection electrode (11A) and a second detection electrode (11B). The first detection electrode (11A) is arranged in the vicinity of the primary-side first electric path (L11) in a state in which it is not electrically in contact with the primary-side first electric path (L11). The second detection electrode (11B) is arranged in the vicinity of the primary-side second electric path (L21) in a state in which it is not electrically in contact with the primary-side second electric path (L21). The voltage detection section (13) detects at least one of a first voltage and a second voltage. The first voltage is the voltage between the first detection electrode (11A) and the ground electrode (12), and the second voltage is the voltage between the second detection electrode (11B) and the ground electrode (12). 12).

The detection system further includes a secondary voltage detection section (17). The secondary voltage detection section (17) is connected to the first secondary electric path (L12) and the second secondary electric path (L22), and detects a third voltage. The third voltage is a voltage between the first secondary electric circuit (L12) and the second secondary electric circuit (L22).

The state determination unit (14) includes a first contact (H1) between the primary side first electric path (L11) and the secondary side first electric path (L12), and a first contact point (H1) between the primary side second electric path (L21) and the secondary side first electric path (L12). When the second contact (H2) between the secondary-side second electric circuit (L22) is closed and the third voltage is below a threshold value, it is determined that the power system is in a power outage state. Further, the state determining unit (14) determines that when the first contact (H1) and the second contact (H2) are open and at least one of the first voltage and the second voltage exceeds a threshold value, Then, it is determined that the power system is in an energized state.

According to this aspect, the energization state or the power outage state is determined based on whether the contact is closed or open, and the primary side voltage (at least one of the first voltage and the second voltage) and the secondary side voltage (the third voltage). It is possible to accurately determine whether

The circuit breaker (101) according to the eighth aspect includes the detection system according to any one of the first to seventh aspects.

According to this aspect, a circuit breaker is realized that makes it possible to detect power restoration of the power system in a state where the contacts of the electric circuit are open, and that is protected from overcurrent when a short circuit or the like occurs.

The distribution board (100) according to the ninth aspect includes the circuit breaker (101) according to the eighth aspect.

According to this aspect, a distribution board is realized that enables detection of power restoration of the power system in a state where the contacts of the electric circuit are open, and that is protected from overcurrent when a short circuit or the like occurs.

1 Detection device 13 Voltage detection unit 14 State determination unit 15 Output unit 16 Battery 17 Secondary voltage detection unit 10 Electrical line L1 First electric line L2 Second electric line N Third electric line 10A Primary side electric line L11 Primary side first electric line L21 Primary side 2nd electric circuit N1 Primary side 3rd electric circuit 10B Secondary side electric circuit L12 Secondary side 1st electric circuit L22 Secondary side 2nd electric circuit N2 Secondary side 3rd electric circuit H Contact H1 1st contact H2 2nd contact HN 3rd contact 11 Detection electrode 11A First detection electrode 11B Second detection electrode 12 Ground electrode 100 Distribution board 101 Main breaker (breaker)
101a Case 102 Branch breaker 103 Limiter (breaker)

Claims (9)

A detection system used in a circuit breaker that opens and closes contacts between a primary circuit to which a system voltage based on power from an electric power system is applied, and a secondary circuit to which a load is connected, comprising:
a detection electrode disposed near the primary circuit in a state where it is not electrically in contact with the primary circuit;
a grounded ground electrode;
The voltage between the detection electrode and the ground electrode is determined based on the current flowing in the electric path between the detection electrode and the ground electrode due to capacitive coupling between the primary side electric path and the detection electrode. a voltage detection unit to detect;
and a battery that supplies power to drive at least the voltage detection section.
detection system. The detection electrode is a conductive plate provided in the casing of the circuit breaker.
Detection system according to claim 1. The primary-side electric circuit includes a primary-side first electric circuit and a primary-side second electric circuit,
The detection electrode includes a first detection electrode arranged in the vicinity of the primary-side first electric path in a state of no electrical contact with the primary-side first electric path, and a first detection electrode placed in the vicinity of the primary-side second electric path. a second detection electrode disposed in electrically non-contact with the primary-side second electrical circuit;
The voltage detection unit detects a first voltage between the first detection electrode and the ground electrode, and a second voltage between the second detection electrode and the ground electrode.
Detection system according to claim 2. further comprising an output section that outputs voltage information regarding the detection result of the voltage detection section;
Detection system according to any one of claims 1-3. the output unit transmits the voltage information to an external device;
5. The detection system according to claim 4. Determining whether the power system is in an energized state or a power outage state based on a detection result of the voltage detection unit, and transmitting power restoration information indicating power restoration of the power system in response to a change from the power outage state to the energized state. further comprising a state determining unit that delivers to the output unit,
The output unit outputs voltage information including the power restoration information.
The detection system according to claim 4 or 5. The primary-side electric circuit includes a primary-side first electric circuit and a primary-side second electric circuit,
The secondary circuit includes a first secondary circuit and a second secondary circuit,
The detection electrode includes a first detection electrode arranged in the vicinity of the primary-side first electric path in a state of no electrical contact with the primary-side first electric path, and a first detection electrode placed in the vicinity of the primary-side second electric path. , at least one of a second detection electrode disposed in electrically non-contact with the primary-side second electric circuit,
The voltage detection unit detects at least one of a first voltage between the first detection electrode and the ground electrode and a second voltage between the second detection electrode and the ground electrode,
a secondary side voltage detection unit connected to the secondary side first electric path and the secondary side second electric path, and detects a third voltage between the secondary side first electric path and the secondary side second electric path; further comprising;
The state determining unit is
a first contact between the primary-side first electrical circuit and the secondary-side first electrical circuit and a second contact between the primary-side second electrical circuit and the secondary-side second electrical circuit are closed; 3, when the voltage is below a threshold, determining that the power system is in a power outage state,
If the first contact and the second contact are open, and at least one of the first voltage and the second voltage exceeds a threshold, determining that the power system is in an energized state;
7. Detection system according to claim 6. comprising a detection system according to any one of claims 1-7,
circuit breaker. comprising the circuit breaker according to claim 8;
Distribution board.

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