JP2022173882A - Detection system, circuit breaker, and distribution board - Google Patents

Abstract

To provide a detection system capable of detecting power recovery of a power system in a state in which a contact of an electric path is open, a circuit breaker, and a distribution board.SOLUTION: A detection system is used for a circuit breaker 101 for opening and closing a contact point between a primary side electric path 10A to which a system voltage based on electric power from a power system is applied and a secondary side electric path 10B to which a load is connected. The circuit breaker 101 includes: a detection electrode 11 arranged in the vicinity of the primary side electric path in a state of being electrically non-contact with the primary side electric path; a grounded ground electrode 12; a voltage detection unit 13 for detecting a voltage between the detection electrode and the ground electrode based on a current flowing in an electric path between the detection electrode and the ground electrode by a capacitive coupling between the primary side electric path and the detection electrode; and a battery 16 for supplying electric power at least for driving the voltage detection unit.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present disclosure relates to detection systems, circuit breakers, and distribution boards, and more particularly to detection systems, circuit breakers, and distribution boards for detecting power restoration in power systems.

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

JP 2010-187514 A

However, in the electric circuit switchgear of Patent Document 1, the control means operates based on the current on the secondary side of the circuit breaker, so it is difficult to detect power recovery when the contacts of the electric circuit are open.

SUMMARY OF THE DISCLOSURE It is an object of the present disclosure to provide a detection system, a circuit breaker, and a distribution board that enable detection of power restoration in a power system with open circuit contacts.

A detection system according to one aspect of the present disclosure is used in a circuit breaker. The circuit breaker opens and closes contacts between the primary and secondary electric circuits. A system voltage based on power from a power system is applied to the primary electric line, and a load is connected to the secondary electric line. The detection system includes a detection electrode, a ground electrode, a voltage detector, and a battery. The detection electrode is arranged in the vicinity of the primary electric circuit in a state of being electrically non-contact with the primary electric circuit, and the ground electrode is grounded. The voltage detection section detects the voltage between the detection electrode and the ground electrode by electrostatic capacitive coupling between the primary side electric circuit and the detection electrode, thereby detecting the electric path between the detection electrode and the ground electrode. detection based on the current flowing through the The battery supplies power to drive at least the voltage detection unit.

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

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

Advantageously, the detection system, circuit breaker, and distribution board of the present disclosure can enable detection of power return in the power system with open circuit contacts.

FIG. 1 is a block diagram of a detection system and circuit breaker in which it is used according to an embodiment of the present disclosure; FIG. FIG. 2 is a block diagram showing a configuration example of a voltage detection section included in the detection system; FIG. 3 is a front view showing the appearance of a distribution board provided with the same circuit breaker. FIG. 4 is a front view showing the inside of the same circuit breaker. FIG. 5 is a flowchart showing state determination processing performed by the same detection system. FIG. 6 is a block diagram showing Modification 1 of the detection system same as above. FIG. 7 is a block diagram showing a configuration example of a voltage detection section included in the detection system of Modification 1. As shown in FIG. FIG. 8 is a block diagram showing Modification 2 of the same detection system. FIG. 9 is a flowchart showing state determination processing performed by the detection system of Modification 2. As shown in FIG.

Each drawing described in the following embodiments is a schematic drawing, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to design and the like 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 recovery in 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. The circuit breaker in FIG. 1 is the master circuit breaker 101 that constitutes the distribution board 100 shown in FIG.

(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 has, for example, an earth leakage detection circuit and an opening/closing mechanism (both not shown). The leakage detection circuit is provided in the secondary electric circuit 10B and detects an electric leakage occurring in the electric circuit 10 . The opening/closing mechanism includes a tripping coil arranged 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 an electrical leakage. to open the contact H. Moreover, the opening/closing mechanism preferably further has an overcurrent detection circuit, and trips the contact H even when an overcurrent (overload current and short-circuit current) flows.

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

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

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

(1-1-1a) Modification of Circuit Breaker The circuit breaker in this modification is the limiter 103 constituting the distribution board 100 shown in FIG. 3, and is referred to as "circuit breaker 103". The circuit breaker 103 operates when the total value of the first current flowing through the first electric line L1 and the second current flowing through the second electric line L2 reaches or exceeds a predetermined upper limit value. , opens the contact H and cuts off the first current and the second current.

In addition, "circuit breaker 101" and "casing 101a of circuit breaker 101" in the following description are read as "circuit breaker 103" and "casing (not shown) of circuit breaker 103" in the modified example.

(1-1-2) Electric Circuit The electric circuit 10 is a single-phase three-wire electric circuit and includes a first electric circuit L1, a second electric circuit L2 and a third electric circuit N. The first electric line L1, the second electric line L2, and the third electric line N correspond to the L1-phase voltage side line, the L2-phase voltage side line, and the neutral line, respectively, which constitute the electric line of the single-phase three-wire system.

The electric circuit 10 is divided into a primary electric circuit 10A and a secondary electric circuit 10B via a contact H. A system voltage based on power from the power system is applied to the primary electric circuit 10A. The system voltage is usually 100V or 200V AC voltage. A load is connected to the secondary electric circuit 10B. The load is, for example, a personal computer (PC), an electric appliance such as 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 line L1 is divided into a primary side first electric line L11 and a secondary side first electric line L12 via a first contact H1.

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

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

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

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

The detection device 1 has, for example, a processor, memory, display, speaker, and communication module (none of which are shown). The memory stores a program and various information, and the processor operates based on the program and various information in the memory, thereby realizing the functions of the state determination unit 14 and the like, which will be described later. 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 also be referred to as a "computer." In addition, when simply referred to as "memory" below, it is usually the memory of the detection device 1, but it may be the memory of an external device, and the location of the memory does not matter as long as it is accessible by the processor.

(1-2-1) Electrode The first detection electrode 11A is arranged in the vicinity of the primary side first electric line L11 constituting the primary side electric line 10A in an electrically non-contact state with the primary side first electric line L11. be.

The vicinity referred to here is a distance that allows insulation between the first detection electrode 11A and the primary side first electric line L11 and enables non-contact voltage measurement.

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

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

However, the embedding may be, for example, that a recess corresponding to the first detection electrode 11A is formed in the wall surface of the housing 101a and the first detection electrode 11A is fitted in the recess. Alternatively, the embedding may be that the wall surface of the housing 101a has a double structure, and the first detection electrode 11A is inserted in the gap between the inner wall and the outer wall that constitute the wall surface. 1 detection electrode 11A may be integrally formed, and the mode thereof is not limited.

A conductive plate is a plate-shaped member made of a conductive material. The conductive material is, for example, iron, but may 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 thickness of the first detection electrode 11A in FIG. 4 is smaller than the thickness of the housing 101a, and the entirety is embedded in the housing 101a. It may be thicker or more. A portion of the first detection electrode 11A, which is thicker than the thickness of the housing 101a, is embedded in the housing 101a and the remaining portion is exposed from the housing 101a.

In the housing 101a of FIG. 4, the first electric line L1 (primary-side first electric line L11) is present near the left side wall, so the first detection electrode 11A is embedded in the left side wall. However, in the housing 101a, the first electric line L1 (primary side first electric line L11) is also close to the upper wall, so the first detection electrode 11A may be embedded on the left side of the upper wall. The first detection electrode 11A may be provided anywhere in the vicinity of the first electric line L1 (primary side first electric line L11).

Also, 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 line L1 (primary side first electric line L11).

Moreover, the shape of the first detection electrode 11A is not limited to a plate shape, and may be any shape such as a bar shape, a tablet shape, or the like. The rod-shaped first detection electrode 11A is preferably provided in the housing 101a in parallel with the first electric line L1 (primary side first electric line L11).

Furthermore, the first detection electrode 11A does not necessarily have to be provided on the housing 101a itself. 101a, or may be provided outside the housing 101a.

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

(1-2-2) Detection Device The detection device 1 of Embodiment 1 includes a voltage detection section 13, a state determination section 14, an output section 15, and a battery 16, as shown in FIG. Although the electrodes described above 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 the voltage (hereinafter “first voltage”) between the primary side first electric line L11 and the primary side third electric line N1 that constitute the primary side electric line 10A via the first detection electrode 11A. A contact is detected, and a first voltage value indicating the detection result is obtained.

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

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

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 0, and the first current becomes 0. Obtain the voltage value of the first voltage at the time.

Specifically, for example, as shown in FIG. A first galvanometer 132A for detecting a first current flowing in an electric circuit between the and a first control circuit 133A that 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 A voltage is measured, and a first voltage value indicating the measurement result is obtained.

The first voltage value acquired in this manner is transferred to the state determination unit 14 . Also, the acquired first voltage value is normally delivered to the output unit 15 as well.

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

The state determination unit 14 determines that the power system is in an energized state when the first voltage value is greater than the threshold, and determines that the power system is in a power outage state when the first voltage value is less than the threshold. do.

Note that the threshold value is, for example, “0”, but may be a value greater than 0. When the threshold value is “0”, the state determination unit 14 determines that the electric power system is in an energized state if “first voltage value>0”, and if “first voltage value=0”, the electric power The system is determined to be in a blackout state.

The state determination unit 14 holds the acquired state information in memory. The acquired state information is usually delivered to the output unit 15 .

In addition, the state determination unit 14 acquires power restoration information according to the change from the power failure state to the power supply state, and transfers the acquired power restoration information to the output unit 15 . The 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 be an image such as a symbol mark indicating that the power has been restored.

Specifically, the state determination unit 14 compares the state information acquired this time with the state information acquired last time, and determines whether or not the power failure state has changed to the energized state. Then, the state determination unit 14 acquires power restoration information when the state changes from the power failure state to the power supply state, and transfers the power restoration information to the output unit 15 .

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

The output includes, for example, display on a display, audio output from a speaker, transmission to an external device, and the like, but is not limited to these. The display is, for example, a liquid crystal display provided on a cover (not shown) of the distribution board 100, but it may be a monitor outside the distribution board 100, and the type and location of the display do not matter. The speaker is, for example, a built-in speaker of the distribution board 100, but may be a speaker of an external monitor, regardless of its type and location. The external device is, for example, a mobile communication terminal such as a smart phone, but may also be an information appliance having a communication function, regardless of the type and location.

The output unit 15 outputs voltage information including the first voltage value acquired by the voltage detection unit 13 . By outputting the voltage information including the first voltage value in this way, it becomes possible for the user to recognize the restoration of power in 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 instead of the first voltage value. By outputting the voltage information including the state information in this way, it becomes possible for the user to accurately recognize the restoration of power in the power system.

The output unit 15 outputs voltage information including the power restoration information in response to the power restoration information being acquired by the state determination unit 14 . The voltage information including the power restoration information may further include a first voltage value. In this way, by outputting the voltage information including the power restoration information according to the change from the power failure state to the power supply state, it is possible to make the user explicitly recognize the power restoration of the electric power system.

In particular, the output unit 15 transmits the voltage information to an external device, so that even a user at a distance from the circuit breaker 101 can recognize the power recovery.

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

Battery 16 is typically disposable, but may be rechargeable. The rechargeable battery 16 is charged with power from the secondary electric line 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 even when the contact H of the electric circuit 10 is open, it is possible to detect the restoration of power in the electric power system. and is protected from overcurrent even if a short circuit or the like occurs.

(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 ends when the power of the detection device 1 is turned off.

The state determination unit 14 determines whether or not the primary voltage detected by the voltage detection unit 13 is greater than 0 (step S11). Note that the primary side voltage in the first embodiment is the first voltage. When the primary-side voltage is 0, the state determination unit 14 determines that the power system is in a power outage, and sets state information indicating power outage 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 determination unit 14 holds the state information (previous state information) set to the "state" until then in the memory. After execution of step S12, the process returns to step S11.

If the primary side voltage is greater than 0, the state determination unit 14 sets state information indicating that the power is being supplied to the "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 failure to energization. Determine (step S14).

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

(1-3) Modification 1 of detection system
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, as shown in FIG. The detection device 1 includes a voltage detection unit 13, a state determination unit 14, an output unit 15, and a battery 16, like the detection device 1 (see FIG. 1) in the first embodiment.

That is, the detection system of Modification 1 is obtained by adding the second detection electrode 11B to the detection system of Embodiment 1 shown in FIG. The basic operation of each component other than the second detection electrode 11B is the same as in the detection system of Embodiment 1, and only the operations different from those in Embodiment 1 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 line L21 in a state of being electrically non-contact with the primary side second electric line L21.

The second detection electrode 11B in Modification 1 is provided on 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. As shown in FIG.

In the housing 101a of FIG. 4, the second electric line L2 (the primary side second electric line 21) is present near the right side wall, so the second detection electrode 11B is embedded in the right side wall. However, in the housing 101a, the second electric line L2 (primary-side second electric line 21) is also close to the upper wall, so the second detection electrode 11B may be embedded on the right side of the upper wall. The place where the second detection electrode 11B is provided may be anywhere in the vicinity of the second electric line L2 (the primary side second electric line 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.

Moreover, the shape of the second detection electrode 11B is not limited to a plate shape, and may be any shape such as a bar shape, a tablet shape, or the like. The rod-shaped second detection electrode 11B is preferably provided in the housing 101a in parallel with the second electric line L2 (second primary electric line 21).

Furthermore, the second detection electrode 11B does not necessarily have to be provided on the housing 101a itself. 101a, or may be provided outside the housing 101a.

(1-3-2) Detection Device in Modification 1 As described above, the voltage detection unit 13 detects the first voltage, and in addition to the operation of acquiring the first voltage value, the primary side electric circuit 10A constituting the primary The voltage of the side second electric line L21 and the primary side third electric line N1 (hereinafter “second voltage”) is detected without contact via the second detection electrode 11B, and the second voltage value indicating the detection result is obtained. Do more actions.

Since the second voltage is equal to the voltage between the second detection electrode 11B and the ground electrode 12, the voltage detection section 13 detects the voltage between the second detection electrode 11B and the ground electrode 12 to , the voltage of the second electrical circuit L2 can be detected in a non-contact manner.

The voltage detection unit 13 in the present modified example 1 detects a current ( A second voltage between the second detection electrode 11B and the ground electrode 12 is detected based on the 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 the “second applied voltage”) so that the second current becomes 0, and adjusts the voltage applied to the second detection electrode 11B when the first current becomes 0. 2 Get the voltage value of the voltage.

For example, as shown in FIG. 7, the voltage detection unit 13 includes a first voltage application circuit 131A, a first galvanometer 132A, and a first control circuit 133A, as well as a second detection electrode 11B for applying a voltage to the second detection electrode 11B. A two-voltage application circuit 131B, a second galvanometer 132B for detecting the second current flowing in the electric path between the second detection electrode 11B and the ground electrode 12, and based on the detection result of 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 A voltage is measured, and a second voltage value indicating the measurement result is obtained.

The second voltage value obtained in this way is handed over to the state determination unit 14 together with the first voltage value. It should be noted that the second voltage value is normally delivered to the output unit 15 together with the first voltage value.

Based on the first voltage value, the state determination unit 14 determines whether the first voltage constituting the system voltage is in an energized state or a power failure state, and acquires state information (first state information) regarding the first voltage. In addition, the state determination unit 14 determines whether the second voltage constituting the system voltage is in an energized state or a power failure state based on the second voltage value, and acquires state information (second state information) regarding the second voltage. .

If the first voltage value is greater than the threshold value (for example, “first voltage value>0”), the state determination unit 14 determines that the first voltage constituting the system voltage is in an energized state. If the value is equal to or less than the threshold (for example, "first voltage value = 0"), the first voltage is determined to be in a power failure state, and the first state information indicating the determination result ("energized state" or "power failure state") to get Further, if the second voltage value is greater than the threshold value (for example, “second voltage value>0”), the state determination unit 14 determines that the second voltage constituting the system voltage is in an energized state, If the voltage value is equal to or less than the threshold (for example, "second voltage value = 0"), the second voltage is determined to be in a power failure state, and the second state indicating the determination result ("energized state" or "power failure state") Get information. The first state information and the second state information acquired in this way are handed over to the output unit 15 .

In addition, the state determination unit 14 acquires first power recovery information indicating power recovery of the first voltage according to the change of the first voltage from the power failure state to the energized state, and uses the acquired first power recovery information. It is handed over to the output unit 15 . In addition, the state determination unit 14 acquires second power recovery information indicating power recovery of the second voltage according to the change of the second voltage from the power failure state to the energized state, and uses the acquired second power recovery information. It is handed over to the output unit 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 the voltage information further including the second voltage value, it is possible for the user to recognize power recovery of each of the first voltage and the second voltage (the L1 phase and the L2 phase) that constitute the system voltage.

The output unit 15 outputs the first voltage value acquired by the state determination unit 14 in addition to the first voltage value and the second voltage value acquired by the voltage detection unit 13 or instead of the first voltage value and the second 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 is possible for the user to recognize the power recovery of each of the first voltage and the second voltage.

When the state determination unit 14 acquires at least one of the first power recovery information and the second power recovery information, the output unit 15 includes the acquired one or two power recovery information. Voltage information may 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.

Thus, by outputting voltage information including one or two pieces of power restoration information, it is possible to make the user explicitly recognize that at least one of the first voltage and the second voltage constituting the system voltage has been restored. .

For example, by outputting voltage information containing two pieces of power recovery information, it is possible to make the user recognize that the system voltage has completely recovered.

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

(1-3-3) State Determination Process in Modification 1 The state determination unit 14 in Modification 1 executes the state determination process according to the flowchart of FIG. 5 for each electric circuit.

That is, for the first electric line L1, the voltage detection unit 13 detects the first voltage via the first detection electrode 11A, and the state determination unit 14 uses the first voltage as the primary side voltage in step S11. state determination processing is executed.

Also, for the second electric line L2, the voltage detection unit 13 detects the second voltage via the second detection electrode 11B, and the state determination unit 14 uses the second voltage as the primary side voltage in step S11, state determination processing is executed.

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

According to Modification 1, the first detection electrode 11A and the second detection electrode 11B are arranged in the primary-side first electric line L11 and the primary-side second electric line L21, respectively. Voltage can be detected.

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

That is, the detection system of Modification 2 is obtained by adding the secondary side voltage detection section 17 to the detection system of Embodiment 1 shown in FIG.

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

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

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

The state determination unit 14 determines the voltage of the secondary electric circuit 10B (hereinafter referred to as "secondary voltage") when the steering wheel is NO, and the voltage of the primary electric circuit 10A when the steering wheel is OFF (hereinafter referred to as "primary voltage ”), it is determined whether the power system is in the energized state or in the blacked out state.

The case where the handle is NO usually means the first contact H1 between the primary side first electric line L11 and the secondary side first electric line L12, the first contact H1 between the primary side second electric line L21 and the secondary side second electric line L22. Although the second contact H2 and the third contact HN between the primary side third electric line N1 and the secondary side third electric line N2 are all closed, the third contact HN may be open.

When the handle is turned off, 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 side voltage is usually the voltage between the secondary side first electric line L12 and the secondary side second electric line L22 (hereinafter "third voltage"). However, the secondary side voltage may be, for example, the voltage between the secondary side first electric line L12 and the secondary side third electric line N2, or the voltage between the secondary side second electric line L22 and the secondary side third electric line N2. It does not matter if the voltage is between .

A signal indicating “ON” or “OFF” is transmitted from the steering wheel to the state determination unit 14 in accordance with whether the steering wheel is turned ON or OFF.

The state determination unit 14 determines whether the steering wheel is ON or OFF based on the above signal. It is further determined whether the secondary voltage (eg, the third voltage) is greater than the threshold. Then, when the secondary voltage is greater than the threshold (for example, “third voltage > 0”), the state determination unit 14 determines that the system voltage is in an energized state, and the secondary voltage is less than or equal to the threshold (for example, If "third voltage=0"), it is determined that the power system is in a blackout 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 side voltage (for example, the first voltage) is higher than the threshold. judge further. Then, when the primary side voltage is higher than the threshold (for example, “first voltage>0”), the state determination unit 14 determines that the electric power system is in the energized state. On the other hand, when the primary-side voltage is equal to or less than the threshold (for example, "first voltage=0"), the state determination unit 14 determines that the power system is in a blackout state.

(1-4-3) State Determination Process in Modification 2 The state determination unit 14 in Modification 2 executes a process (state determination process) according to the flowchart shown in FIG. The flowchart of FIG. 9 is obtained by adding the following two steps S10a and S10b to the flowchart of FIG.

The state determination unit 14 determines whether or not the steering wheel 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 proceeds to step S11.

When the steering wheel is ON, the state determination unit 14 determines whether or not the secondary voltage (third voltage) detected by the secondary voltage detection 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 Modification 2, it is possible to accurately determine whether the power is on or off based on ON/OFF of the steering wheel and the primary voltage (first voltage) and secondary voltage (third voltage).

(1-5) Modification 3 of detection system
The detection system (not shown) of Modification 3 has the second detection electrode 11B (not shown) described in Modification 1 instead of the first detection electrode 11A in the detection system of Modification 2 (see FIG. 8). See FIG. 6).

The voltage detector 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 side voltage referred to by the state determination unit 14 when the steering wheel is turned off is the second voltage.

That is, in step S11 of FIG. 9, it is determined whether or not the second voltage is greater than the threshold (second voltage>0). Then, when the second voltage is greater than the threshold, it is determined that the power system is in an energized state, and when the primary side voltage is equal to or less than the threshold (second voltage = 0), it is determined that the power system is in a power failure state. be done.

According to Modified Example 3, it is possible to accurately determine whether the power is on or off based on the ON/OFF state of the steering wheel and the primary voltage (second voltage) and secondary voltage (third voltage).

(1-6) Modification 4 of detection system
The detection system of Modification 4 further includes a second detection electrode 11B in the detection system of Modification 2 (see FIG. 8). The voltage detector 13 further detects a second voltage in addition to the first voltage. The primary side voltages referred to by the state determination unit 14 when the steering wheel is turned off are the first voltage and the second voltage.

That is, in step S11 of FIG. 9, first, it is determined whether or not the first voltage is greater than the threshold (first voltage>0). Then, when the first voltage is greater than the threshold, it is determined that the L1 phase constituting the system voltage is in an energized state, and when the first voltage is the threshold or less (first voltage = 0), the L1 phase is out of power. state.

Next, it is determined whether the second voltage is greater than the threshold (second voltage>0). Then, when the second voltage is greater than the threshold, it is determined that the L2 phase constituting the system voltage is in an energized state, and when the second voltage is the threshold or less (second voltage = 0), the L2 phase is out of power. state.

In this way, whether the power failure state or the energized state is determined for each of the L1 and L2 phases that constitute the system voltage, and the state information indicating the determination result is acquired. The output unit 15 outputs voltage information including the two pieces of state information thus acquired (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 the power failure state has changed to the energized state for each of the L1 and L2 phases, and voltage information including power restoration information in accordance with the change from the power failure state to the energized state. to get The output unit 15 outputs the voltage information including the first power recovery information when the first power recovery information about the L1 phase is acquired, and outputs the third power recovery information when the second power recovery information about the L2 phase is acquired. Outputs voltage information including voltage information.

According to Modification 4, it is possible to allow 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 detection is performed by the detection electrodes 11 (first detection electrode 11A, second detection electrode 11B), power recovery of the electric power system in a state where the contact H of the electric circuit 10 is open (for example, a handle trip state due to vibration) A detection system is realized that can allow the detection of

If the electric circuit switchgear of Patent Document 1 were 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 earth leakage occurs. not.

On the other hand, the detection system of the first embodiment is electrically insulated from the primary electric circuit 10A, so 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 comprising the detection system of Embodiment 1, as shown in FIG. This breaker 101 is the main breaker 101 that constitutes the distribution board 100 shown in FIG.

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

Note that the circuit breaker 101 (103) in FIG. not shown). The single-phase two-wire electric circuit is the electric circuit 10 excluding the second electric circuit 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, A limiter 103) is implemented.

(3) Embodiment 3
Embodiment 3 of the present disclosure is a distribution board 100 including a main 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 limiters 103 . Note that the number of branch breakers 102 may be one. Also, the distribution board 100 may not include the limiter 103 .

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

According to the third embodiment, the power distribution board 100 is realized that enables detection of power recovery in the electric power system while the contact H of the electric circuit 10 is open, and is protected from overcurrent when a short circuit or the like occurs. be.

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

The detection system includes detection electrodes (11: 11A, 11B), a ground electrode (12), a voltage detector (13), and a battery (16). The detection electrodes (11: 11A, 11B) are arranged in the vicinity of the primary side electric line (10A: L11, L21) in a state of being electrically non-contact with the primary side electric line (10A: L11, L21). The ground electrode (12) is grounded. The voltage detection section (13) detects the voltage between the detection electrodes (11: 11A, 11B) and the ground electrode (12) by detecting the voltage between the primary side electric path (10A: L11, L21) and the detection electrodes (10A: L11, L21). Electrostatic coupling with (11A, 11B) detects based on the current flowing in the electrical path between the detection electrodes (11:11A, 11B) and the ground electrode (12). The battery (16) supplies power to drive at least the voltage detector (13).

According to this aspect, since the battery-driven voltage detection unit detects the voltage of the primary side electric circuit with the non-contact detection electrode, even when the contact of the electric circuit is open (for example, the handle trip state due to vibration), A detection system is provided that enables detection of power failures in the power system and protects against overcurrents 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 on the housing (101a) of the circuit breaker (101).

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

In the detection system according to the third aspect, in the second aspect, the primary electric lines (10A: L11, L21) include a primary side first electric line (L11) and a primary side second electric line (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 line (L11) in an electrically non-contact state with the primary side first electric line (L11). The second detection electrode (11B) is arranged in the vicinity of the second primary electric line (L21) in an electrically non-contact state with the second primary electric line (L21). The voltage detector (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 line, the voltage on the primary side can be detected for each electric line.

A detection system according to a fourth aspect, in any one of the first to third aspects, further comprises an output section (15). 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 also be notified to a user who is away from the circuit breaker.

The detection system according to the sixth aspect, in the fourth or fifth aspect, further comprises a state determination section (14). A state determination unit (14) determines whether the electric power system is in an energized state or a power failure state based on the detection result of the voltage detection unit (13). In addition, the state determination unit (14) transfers power recovery information indicating power recovery of the power system to the output unit (15) in accordance with the change from the power failure state to the power supply state. The output unit (15) outputs voltage information including the power restoration information.

According to this aspect, by transmitting the power restoration information according to the change from the power failure state to the power supply state, it is possible to make the user aware of the power restoration.

In the detection system according to the seventh aspect, in the sixth aspect, the primary electric lines (10A: L11, L21) include a primary side first electric line (L11) and a primary side second electric line (L21). The secondary electric circuit (10B: L12, L22) includes a secondary first 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 line (L11) in an electrically non-contact state with the primary side first electric line (L11). The second detection electrode (11B) is arranged in the vicinity of the second primary electric line (L21) in an electrically non-contact state with the second primary electric line (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 (11B). 12) is the voltage between

The detection system further comprises a secondary side voltage detection section (17). The secondary side voltage detection section (17) is connected to the secondary side first electric line (L12) and the secondary side second electric line (L22) to detect a third voltage. The third voltage is a voltage between the secondary side first electric line (L12) and the secondary side second electric line (L22).

The state determination unit (14) includes a first contact (H1) between the primary side first electric line (L11) and the secondary side first electric line (L12), the primary side second electric line (L21) and the When the second contact (H2) between the secondary-side second electrical circuit (L22) is closed and the third voltage is equal to or less than the threshold, it is determined that the power system is in a power outage state. In addition, 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, the state determination unit (14) Then, it is determined that the power system is in an energized state.

According to this aspect, based on whether the contacts are 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), the power state or the power failure state can be accurately determined.

A circuit breaker (101) according to an eighth aspect comprises the detection system according to any one of the first to seventh aspects.

According to this aspect, it is possible to realize a circuit breaker that enables detection of power recovery in the electric power system while the contacts of the electric circuit are open, and that is protected from overcurrent when a short circuit or the like occurs.

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

According to this aspect, it is possible to realize a distribution board that enables detection of power recovery in the electric power system while 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 side voltage detection unit 10 electric circuit L1 first electric circuit L2 second electric circuit N third electric circuit 10A primary electric circuit L11 primary side first electric circuit L21 primary side Second electric circuit N1 Primary third electric circuit 10B Secondary electric circuit L12 Secondary first electric circuit L22 Secondary second electric circuit N2 Secondary third electric circuit H Contact H1 First contact H2 Second contact HN Third contact 11 Detection electrode 11A First detection electrode 11B Second detection electrode 12 Ground electrode 100 Distribution board 101 Main breaker (circuit breaker)
101a housing 102 branch breaker 103 limiter (circuit 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 a power system is applied and a secondary circuit to which a load is connected,
a detection electrode arranged in the vicinity of the primary electric circuit in a state of being electrically non-contact with the primary electric 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 the capacitive coupling between the primary side electric path and the detection electrode. a voltage detection unit that detects
a battery that supplies power to drive at least the voltage detection unit;
detection system. The detection electrode is a conductive plate provided on the housing of the circuit breaker,
A 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 electrodes include a first detection electrode arranged in the vicinity of the primary side first electric line in a state of being electrically non-contact with the primary side first electric line, and a vicinity of the primary side second electric line. Including a second detection electrode arranged in a state of being electrically non-contact with the primary side second electric 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.
3. A detection system according to claim 2. Further comprising an output unit that outputs voltage information regarding the detection result of the voltage detection unit,
A detection system according to any one of claims 1-3. The output unit transmits the voltage information to an external device.
5. A detection system according to claim 4. Based on the detection result of the voltage detection unit, it is determined whether the power system is in an energized state or a power failure state, and power restoration information indicating power restoration of the power system is generated according to a change from the power failure state to the energized state. Further comprising a state determination unit for delivering to the output unit,
The output unit outputs voltage information including the power recovery information.
6. A 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-side electric circuit includes a secondary-side first electric circuit and a secondary-side second electric circuit,
The detection electrodes include a first detection electrode arranged in the vicinity of the primary side first electric line in a state of being electrically non-contact with the primary side first electric line, and a vicinity of the primary side second electric line. Including at least one of a second detection electrode arranged in a state of being 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 line and the secondary side second electric line and detecting a third voltage between the secondary side first electric line and the secondary side second electric line. further comprising
The state determination unit
A first contact between the primary side first electric circuit and the secondary side first electric circuit and a second contact between the primary side second electric circuit and the secondary side second electric circuit are closed, and 3 when the voltage is less than or equal to the threshold, determine that the power system is in a power failure state;
When the first contact and the second contact are open, and at least one of the first voltage and the second voltage exceeds a threshold, it is determined that the power system is in an energized state;
7. A detection system according to claim 6. comprising a detection system according to any one of claims 1-7,
circuit breaker. Equipped with the circuit breaker according to claim 8,
Distribution board.

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