Measurement system and attached sensor device

Abstract

A measurement system (100) comprises a branch circuit breaker (2) disposed in each of a plurality of branch circuits (20), an attached sensor device (3) that is connected to each branch circuit breaker (2) and measures the energization states of the branch circuits (20), and a state-monitoring unit (4) that displays the energization states measured by the attached sensor device (3). When receiving an operation from a user, the attached sensor device (3) transmits, to the state-monitoring unit (4), a display request for displaying the measured energization states of the branch circuits (20). Upon receiving the display request from the attached sensor device (3), the state- monitoring unit (4) displays the energization states of the branch circuits (20) on the basis of the display request.

Description

Measurement systems and associated sensor devices

[0001] The present disclosure relates to a measurement system and an attached sensor device for measuring the electrical conduction state of a panel having multiple branch circuits.

[0002] Conventionally, measurement systems for measuring the current status of a panel having multiple branch circuits have been known. For example, a distribution panel, such as that disclosed in Patent Document 1, includes a main breaker disposed in a main circuit connected to an external commercial power source, branch breakers disposed in each of multiple branch circuits branching from the main breaker, and a status monitoring unit that displays current status of the branch circuits. The main breaker has an open / close contact that turns on or off the connection of the main circuit. When an overcurrent flows in a branch circuit, the branch breaker shuts off the branch circuit and cuts off the power supply to the load connected to the branch circuit. The status monitoring unit displays the current status of the branch circuit on a data display unit along with an individual address assigned to each branch circuit.

[0003] Japanese Patent Application Laid-Open No. 2008-228516

[0004] However, with the technology described in Patent Document 1, for example, when a status monitoring unit and each branch breaker are paired for wireless communication, it is usually difficult to easily determine from their appearance which branch circuit is connected to each branch breaker. Therefore, one method is to provide each branch breaker with an LED (light emitting diode), and operate the status monitoring unit to sequentially check paired branch breakers until the LED of the branch breaker connected to the branch circuit whose power information you want to check responds. However, each time you check the power status of a branch circuit, you must repeatedly operate the status monitoring unit until the LED of the branch breaker you want to check lights up, which may reduce your work efficiency. Another method is to pair the status monitoring unit with each branch breaker by registering a number or symbol as pairing information in the status monitoring unit. Furthermore, the branch breaker may be marked with a number or symbol as pairing information. One possible method is to compare the branch breaker's numerical value or symbol displayed on the data display unit with the numerical value or symbol marked on the branch breaker to determine the displayed branch circuit's position on the panel. However, every time the user checks the power status of the branch circuit, they must compare the branch breaker's numerical value or symbol displayed on the data display unit with the numerical value or symbol marked on the branch breaker, which could reduce the user's work efficiency.

[0005] The present disclosure has been made in consideration of the above, and aims to provide a measurement system that allows a user to easily check the current flow information of a branch circuit that they wish to check, out of multiple branch circuits provided on a panel, using a status monitoring unit.

[0006] To solve the above-mentioned problems and achieve the object, the measurement system according to the present disclosure includes a branch circuit breaker disposed in each of a plurality of branch circuits, an auxiliary sensor device connected to each branch circuit breaker and measuring the energization state of the branch circuits, and a status monitoring unit that displays the energization state measured by the auxiliary sensor device. When the auxiliary sensor device receives an operation from a user, it transmits a display request to the status monitoring unit to display the measured energization state of the branch circuits. When the status monitoring unit receives the display request from the auxiliary sensor device, it displays the energization state of the branch circuits based on the display request.

[0007] The measurement system according to the present disclosure has the advantage that the user can easily check the current flow information of the branch circuit of interest, among the multiple branch circuits provided on the panel, using the status monitoring unit.

[0008] 1. Overall configuration diagram showing a measurement system according to an embodiment. 2. Block diagram showing the internal structure of a main circuit breaker and a status monitoring unit included in the measurement system according to an embodiment. 3. Block diagram showing the internal structure of a branch circuit breaker and an attached sensor device included in the measurement system according to an embodiment. 4. Flowchart showing the processing of an attached sensor device included in the measurement system according to an embodiment. 5. Flowchart showing the processing when a user views the power supply status in the status monitoring unit included in the measurement system according to an embodiment. 6. Flowchart showing the processing for displaying an alarm screen in the status monitoring unit included in the measurement system according to an embodiment.

[0009] Hereinafter, a measurement system and an attached sensor device according to an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0010] 1 is an overall configuration diagram showing a measurement system according to an embodiment. The measurement system 100 according to this embodiment measures the current flow state of a panel having multiple branch circuits, such as a distribution panel, switchboard, or control panel. As shown in FIG. 1, the measurement system 100 according to this embodiment includes a main circuit breaker 1, a branch circuit breaker 2, an auxiliary sensor device 3, and a status monitoring unit 4.

[0011] As shown in FIG. 1 , a trunk circuit breaker 1 is disposed in a trunk circuit 10 connected to an external commercial power source (not shown). FIG. 2 is a block diagram showing the internal structure of the trunk circuit breaker and a status monitoring unit included in a measurement system according to an embodiment. As shown in FIG. 2 , the trunk circuit breaker 1 includes a current transformer (CT) 11 serving as a current sensor, a voltage transformer (VT) 12 serving as a voltage sensor, a zero-phase-sequence current transformer (ZCT) 13 serving as a leakage current detection sensor, a microcomputer 14, a tripping circuit 15, a tripping device 16, switching contacts 17, and a communication unit 18. The trunk circuit breaker 1 can acquire the energization status of the trunk circuit 10 from the CT 11, the VT 12, and the ZCT 13. The energization status may indicate measurement values ​​detected by each sensor, a state of whether or not there is an energization based on the measurement values, or a state of whether or not there is an abnormality based on the measurement values. The current sensor, voltage sensor, and earth leakage detection sensor are not limited to the above configurations. The current sensor, voltage sensor, or earth leakage detection sensor may be configured by combining any of CT, VT, and ZCT, or may use a resistance or magnetic sensor. Furthermore, the main circuit breaker 1 does not need to be equipped with all of the current sensor, voltage sensor, and earth leakage detection sensor. The sensors installed in the main circuit breaker 1 are selected and installed depending on the purpose of protecting the main circuit 10, and may include sensors other than those listed above.

[0012] The microcomputer 14 has an information processing unit 14a and a storage unit 14b. The information processing unit 14a processes the energization states acquired by the CT11, VT12, and ZCT13. The storage unit 14b stores the energization states acquired by the CT11, VT12, and ZCT13.

[0013] The tripping circuit 15 drives the tripping device 16 in response to a tripping signal from the information processing unit 14a. The tripping device 16 opens the switching contact 17 when the power supply state of the main circuit 10 is abnormal. The switching contact 17 has a fixed contact and a movable contact (not shown). The switching contact 17 is closed when the fixed contact and the movable contact come into contact with each other, connecting the electrical path of the main circuit 10. The switching contact 17 is opened when the fixed contact and the movable contact separate, interrupting the electrical path of the main circuit 10.

[0014] Specifically, in the trunk circuit breaker 1, the current value measured by the CT 11 is input to the information processing unit 14a of the microcomputer 14 and compared with a current value previously stored in the memory unit 14b. If the current value measured by the CT 11 is greater than the current value previously stored in the memory unit 14b, a trip signal is sent to the trip circuit 15, which then drives the trip device 16. This causes the trunk circuit breaker 1 to break the electrical path of the trunk circuit 10 and enter a tripped state. Also, if a ground fault is detected by the ZCT 13, the trunk circuit breaker 1 sends a trip signal to the trip circuit 15, which then drives the trip device 16, which then breaks the electrical path of the trunk circuit 10 and enters a tripped state.

[0015] The communication unit 18 is connected to the status monitoring unit 4 by wire, and transmits the power supply status of the main circuit 10 to the status monitoring unit 4 .

[0016] 1 , a branch circuit breaker 2 is disposed in each of a plurality of branch circuits 20 branching off from a main circuit breaker 1. A load including, for example, one or more electrical devices or electrical facilities is connected to the branch circuits 20. Power is supplied to the load from an external commercial power source via the main circuit 10 and the branch circuits 20.

[0017] FIG. 3 is a block diagram showing the internal structure of a branch circuit breaker and an attached sensor device included in the measurement system according to the embodiment. As shown in FIG. 3 , the branch circuit breaker 2 has a switch contact 21 that connects or disconnects the electrical path of the branch circuit 20. The switch contact 21 has a fixed contact and a movable contact (not shown). The switch contact 21 is closed when the fixed contact and the movable contact come into contact with each other, thereby connecting the electrical path of the branch circuit 20. The switch contact 21 is opened when the fixed contact and the movable contact separate, thereby disconnecting the electrical path of the branch circuit 20. When an overcurrent or short-circuit current flows through the branch circuit 20, the branch circuit breaker 2 opens the switch contact 21 for a preset time, thereby disconnecting the electrical path of the branch circuit 20 and stopping the power supply to the load connected to the branch circuit 20. The branch circuit breaker 2 may be a circuit breaker with a function to calculate the amount of power, etc., or may be a general-purpose circuit breaker without such a function. Furthermore, the number of branch circuit breakers 2 is not limited to three as shown in FIG. 1, but may be one or two, or may be four or more.

[0018] As shown in FIG. 1 , the auxiliary sensor device 3 is connected to each branch circuit breaker 2 and measures the current flow state of the branch circuit 20. The current flow state may indicate a measurement value detected by each sensor, or may indicate whether or not current is flowing based on the measurement value. The auxiliary sensor device 3 can be retrofitted to the connection between the branch circuit breaker 2 and the branch circuit 20. The auxiliary sensor device 3 is configured to be electrically connected to the connection between the branch circuit breaker 2 and the branch circuit 20 and is activated using this connection as a power source. The auxiliary sensor device 3 and the status monitoring unit 4 are paired for wireless communication. As shown in FIG. 3 , the auxiliary sensor device 3 includes a current sensor 30, a current measurement unit 31, a voltage measurement unit 32, a microcomputer 33, an operation unit 34, a communication unit 35, and a display unit 36. In addition to these components, the auxiliary sensor device 3 may further include a sensor for monitoring the current flow state of the branch circuit 20.

[0019] The current sensor 30 is connected to the branch circuit 20 and acquires the current value of the current flowing through the branch circuit 20. The current measurement unit 31 measures the current value of the current in the branch circuit 20 acquired by the current sensor 30. The voltage measurement unit 32 measures the voltage value of the branch circuit 20. The microcomputer 33 has an information processing unit 33a and a memory unit 33b. The information processing unit 33a calculates the amount of power and the like based on the current value measured by the current measurement unit 31 and the voltage value measured by the voltage measurement unit 32. The memory unit 33b stores the amount of power and the like calculated by the information processing unit 33a. The memory unit 33b also stores the individual addresses and the like of the attached sensor devices 3.

[0020] The operation unit 34 has operation buttons such as switches operated by the user, and is an input unit that receives display requests from the user to the status monitoring unit 4. The user is, for example, an electrical manager of a building or factory in which the measurement system 100 is installed. When the user operates the operation unit 34, a signal is input to the information processing unit 33a, which controls the start and end of communication by the communication unit 35. Note that the operation unit 34 is not limited to operation buttons such as switches, and may be configured to be operated by a mobile terminal such as a smartphone using short-range wireless communication or the like.

[0021] When the operation unit 34 receives a display request from the user, the communication unit 35 transmits the display request along with the power supply state of the branch circuit 20 and the individual address of the auxiliary sensor device 3 to the status monitoring unit 4. The communication performed by the communication unit 35 may be wireless or wired communication. The display unit 36 ​​displays the status of the auxiliary sensor device 3 and the communication state with the status monitoring unit 4. The status of the auxiliary sensor device 3 indicates, for example, whether the auxiliary sensor device 3 is in normal operation or demonstration, or whether the power supply state of the auxiliary sensor device 3 is normal or abnormal. The display unit 36 ​​is composed of, for example, an LED or the like.

[0022] The status monitoring unit 4 displays the energization state of the main circuit 10 measured by the main breaker 1 and the energization state of the branch circuit 20 measured by the auxiliary sensor device 3. The status monitoring unit 4 is started up when power is supplied from the main circuit 10. As shown in FIG. 2 , the status monitoring unit 4 has a wired communication unit 40, a wireless communication unit 41, a microcomputer 42, a display unit 43, and an operation unit 44.

[0023] The wired communication unit 40 is wiredly connected to the communication unit 18 of the main circuit breaker 1 and receives the energization state of the main circuit 10. The wireless communication unit 41 is connected to the communication unit 35 of the auxiliary sensor device 3 and receives the energization state of the branch circuit 20 and the status of the auxiliary sensor device 3 along with a display request from the user. The microcomputer 42 has an information processing unit 42a and a memory unit 42b. The information processing unit 42a processes the energization state of the main circuit 10 and the energization state of the branch circuit 20 and outputs a signal to the display unit 43. The memory unit 42b stores the energization state processed by the information processing unit 42a, the past energization states and trip history of the main circuit breaker 1 and the branch circuit breakers 2, the status of the auxiliary sensor device 3, etc.

[0024] The display unit 43 displays the energization status of the main circuit 10 and the branch circuits 20, the past energization status and trip history of the main circuit 10 and the branch circuits 20, the status of the attached sensor device 3, and the like, when the user operates the operation unit 44. The display unit 43 is configured, for example, as an LCD (Liquid Crystal Display). The operation unit 44 has operation buttons such as switches operated by the user and is an input unit that accepts operations from the user. By operating the operation unit 44, the user can check the energization status of the main circuit 10 and the branch circuits 20, the past energization status and trip history of the main circuit 10 and the branch circuits 20, the status of the attached sensor device 3, and the like on the display unit 43. The operation unit 44 may be configured to allow, for example, setting changes and selection of display items. Furthermore, the operation unit 44 is not limited to operation buttons such as switches, and may be configured to be operated by a mobile device such as a smartphone using near-field wireless communication. If the operation unit 34 of the auxiliary sensor device 3 or the operation unit 44 of the status monitoring unit 4 is a mobile terminal such as a smartphone, the content displayed on the display unit 43 may be displayed on the screen of the mobile terminal.

[0025] 4 is a flowchart showing the processing of the auxiliary sensor device included in the measurement system according to the embodiment. As shown in FIG. 4, the auxiliary sensor device 3 determines whether the operation unit 34 has been operated by the user (step S11). If the auxiliary sensor device 3 determines that the operation unit 34 has been operated (step S11: Yes), it determines that the user has requested the status monitoring unit 4 to display information. The auxiliary sensor device 3 transmits the display request acquired by the operation unit 34, the power supply state of the branch circuit 20, and the status of the auxiliary sensor device 3 to the status monitoring unit 4 (step S12), and terminates the processing. On the other hand, if the auxiliary sensor device 3 determines that the operation unit 34 has not been operated (step S11: No), it terminates the processing.

[0026] FIG. 5 is a flowchart illustrating the process performed by the status monitoring unit 4 of the measurement system according to the embodiment when a user views the power status. As shown in FIG. 5 , the status monitoring unit 4 determines whether a power status display request has been received from the auxiliary sensor device 3 (step S21). If the status monitoring unit 4 determines that a power status display request has been received from the auxiliary sensor device 3 (step S21: Yes), the status monitoring unit 4 identifies the auxiliary sensor device 3 based on its individual address (step S22). The status monitoring unit 4 then displays the identification number of the auxiliary sensor device 3 assigned when paired with the auxiliary sensor device 3 and the power status of the branch circuit 20 measured by the auxiliary sensor device 3 on the display unit 43 (step S23), and terminates the process. This allows the user to easily obtain the power status of the branch circuit 20 they wish to check from the display on the display unit 43 of the status monitoring unit 4. On the other hand, if the status monitoring unit 4 determines that a power status display request has not been received from the auxiliary sensor device 3 (step S21: No), the process terminates.

[0027] As described above, the measurement system 100 according to the present embodiment includes a branch circuit breaker 2 disposed in each of a plurality of branch circuits 20, an auxiliary sensor device 3 connected to each branch circuit breaker 2 and measuring the energization state of the branch circuit 20, and a status monitoring unit 4 that displays the energization state measured by the auxiliary sensor device 3. When the auxiliary sensor device 3 receives a user operation, it transmits a display request to the status monitoring unit 4 to display the measured energization state of the branch circuit 20. When the status monitoring unit 4 receives the display request from the auxiliary sensor device 3, it displays the energization state of the branch circuit 20 based on the display request. Thus, the measurement system 100 according to the present embodiment allows the user to easily check the position and energization state of each branch circuit 20 on the panel by operating the auxiliary sensor device 3 connected to each branch circuit breaker 2 with the status monitoring unit 4. That is, this eliminates the need for, for example, the time and effort required to compare the numerical values ​​or symbols of the branch circuit breakers 2 displayed on the status monitoring unit 4 with the numerical values ​​or symbols marked on the branch circuit breakers 2, as in the conventional case, thereby improving the work efficiency of the user, who is an electrical manager.

[0028] Furthermore, pairing is required between the auxiliary sensor device 3 and the status monitoring unit 4 when wirelessly communicating. Furthermore, the auxiliary sensor device 3 may be relocated and attached to another branch circuit breaker 2 while still paired with the status monitoring unit 4. In this case, the measurement system 100 according to the present embodiment does not require pairing between the auxiliary sensor device 3 and the status monitoring unit 4 again. Instead, the status monitoring unit 4 can display the current flow state of the branch circuit 20 by transmitting a display request to the status monitoring unit 4 to display the current flow state of the branch circuit 20 measured by the auxiliary sensor device 3.

[0029] The measurement system 100 according to the present embodiment may be configured to display an alarm screen on the display unit 43 of the status monitoring unit 4, indicating that the current value has exceeded the alarm threshold, when the current value of the branch circuit 20 measured by the auxiliary sensor device 3 exceeds a preset alarm threshold. The alarm threshold is set to a target value by the user and is stored, for example, in the memory unit 42b. The measurement system 100 according to the present embodiment may be configured to display an alarm screen on the display unit 43 of the status monitoring unit 4, indicating that the current value has exceeded the rated current value, when the current value of the branch circuit 20 measured by the auxiliary sensor device 3 exceeds a preset rated current value. The rated current value is stored, for example, in the memory unit 42b. The setting to display these alarm screens is performed by operating the operation unit 44 of the status monitoring unit 4.

[0030] 6 is a flowchart showing a process for displaying an alarm screen in the status monitoring unit of the measurement system according to the embodiment. As shown in FIG. 6, the status monitoring unit 4 determines whether a request for displaying the power-on state has been received from the auxiliary sensor device 3 (step S31). If the status monitoring unit 4 determines that a request for displaying the power-on state has been received from the auxiliary sensor device 3 (step S31: Yes), the status monitoring unit 4 identifies the auxiliary sensor device 3 using its individual address (step S32) and proceeds to step S33. On the other hand, if the status monitoring unit 4 determines that a request for displaying the power-on state has not been received from the auxiliary sensor device 3 (step S31: No), the process ends.

[0031] The status monitoring unit 4 determines, in the information processing unit 42a, whether the current value of the branch circuit 20 acquired from the auxiliary sensor device 3 is greater than the alarm threshold value stored in the memory unit 42b (step S33). If the status monitoring unit 4 determines that the current value of the branch circuit 20 is greater than the alarm threshold value stored in the memory unit 42b (step S33: Yes), the status monitoring unit 4 displays, on the display unit 43, the identification number of the auxiliary sensor device 3 assigned when paired with the auxiliary sensor device 3 and an alarm screen indicating that the current value has exceeded the alarm threshold (step S34), and terminates the processing. This allows the user to visually check which branch circuits 20 have a current value that exceeds the alarm threshold value.

[0032] On the other hand, if the status monitoring unit 4 determines that the current value of the branch circuit 20 acquired from the auxiliary sensor device 3 is equal to or less than the alarm threshold value stored in the memory unit 42b (step S33: No), the information processing unit 42a determines whether the current value is greater than the rated current value stored in the memory unit 42b (step S35). If the status monitoring unit 4 determines that the current value of the branch circuit 20 is greater than the rated current value stored in the memory unit 42b (step S35: Yes), the status monitoring unit 4 displays on the display unit 43 the identification number of the auxiliary sensor device 3 assigned when paired with the auxiliary sensor device 3 and a warning screen indicating that the current value exceeds the rated current value (step S36), and terminates the processing. This allows the user to visually check the branch circuit 20 whose current value exceeds the rated current value. On the other hand, if the status monitoring unit 4 determines that the current value of the branch circuit 20 is less than or equal to the rated current value stored in the memory unit 42b (step S35: No), it displays on the display unit 43 the identification number of the attached sensor device 3 assigned when paired with the attached sensor device 3 and the current status of the branch circuit 20 measured by the attached sensor device 3 (step S37), and terminates the processing.

[0033] In this way, the measurement system 100 according to this embodiment allows the user to visually check the alarm state of the branch circuit 20. That is, if a motor, for example, is connected to the branch circuit 20 as a load, the user can immediately check whether the alarm threshold has been exceeded or whether the rated current value has been exceeded and the motor is prone to tripping when the motor is started.

[0034] The measurement system 100 according to the present embodiment may be configured to display an alarm screen on the display unit 36 ​​of the auxiliary sensor device 3, indicating that the current value has exceeded the alarm threshold, when the current value of the branch circuit 20 measured by the auxiliary sensor device 3 exceeds a predetermined alarm threshold. The alarm threshold is set to a target value by the user and stored, for example, in the memory unit 33b. The measurement system 100 according to the present embodiment may be configured to display an alarm screen on the display unit 36 ​​of the auxiliary sensor device 3, indicating that the current value has exceeded the rated current, when the current value of the branch circuit 20 measured by the auxiliary sensor device 3 exceeds a predetermined rated current. The rated current value is stored, for example, in the memory unit 33b. In this case, the information processing unit 33a of the auxiliary sensor device 3 determines whether the acquired current value of the branch circuit 20 is greater than the alarm threshold stored in the memory unit 33b. The information processing unit 33a also determines whether the acquired current value of the branch circuit 20 is greater than the rated current value stored in the memory unit 33b. The setting to display the warning screen on these devices is performed by the user operating the operation unit 34 of the auxiliary sensor device 3. This allows the user to check the power supply status of each branch circuit 20 on the auxiliary sensor device 3 as well.

[0035] Furthermore, the measurement system 100 according to this embodiment may be configured to display an alarm screen on the display 43 of the status monitoring unit 4 when the current value of the main circuit 10 exceeds a preset alarm threshold, indicating that the current value has exceeded the alarm threshold. Furthermore, the measurement system 100 according to this embodiment may be configured to display an alarm screen on the display 43 of the status monitoring unit 4 when the current value of the main circuit 10 exceeds a preset rated current value, indicating that the current value has exceeded the rated current value. In this case, the information processing unit 14a of the main circuit breaker 1 determines whether the current value acquired by the CT 11 exceeds the alarm threshold stored in the memory unit 14b. Furthermore, the information processing unit 14a determines whether the current value acquired by the CT 11 of the main circuit breaker 1 exceeds the rated current value stored in the memory unit 14b. When the information processing unit 14a determines that the current value acquired by the CT 11 of the main circuit breaker 1 exceeds the alarm threshold value or the rated current value stored in the memory unit 14b, the communication unit 18 transmits a request to display alarm information to the status monitoring unit 4. In this way, by displaying the alarm state of the main circuit breaker 1 on the display unit 43 of the status monitoring unit 4, it is possible to check both the alarm information of the branch circuit 20 and the alarm information of the main circuit 10, thereby improving user convenience.

[0036] The measurement system 100 according to this embodiment may be configured so that, when the current value of the main circuit 10 exceeds a preset rated current value, the display unit 36 ​​of the auxiliary sensor device 3 displays an alarm indicating that the current value has exceeded the rated current value. The case where the current value of the branch circuit 20 has exceeded a preset alarm threshold value and the case where the current value of the main circuit 10 has exceeded the preset rated current value may be distinguished by changing the display method of the display unit 36, for example, by changing the blinking pattern.

[0037] Fig. 7 is an overall configuration diagram showing a modified example of the measurement system according to the embodiment. In the modified measurement system 101 shown in Fig. 7, the status monitoring unit 4 is provided independently of the main circuit 10 and is activated by an external power source 5. As a result, even if a power outage occurs in the main circuit 10, the status monitoring unit 4 can safely maintain the power supply status acquired from the attached sensor device 3, thereby improving user convenience.

[0038] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, and parts of the configurations may be omitted or modified without departing from the spirit of the invention.

[0039] 1 Main circuit breaker, 2 Branch circuit breaker, 3 Auxiliary sensor device, 4 Status monitoring unit, 5 External power supply, 10 Main circuit, 11 CT, 12 VT, 13 ZCT, 14, 33, 42 Microcomputer, 14a, 33a, 42a Information processing unit, 14b, 33b, 42b Memory unit, 15 Trip circuit, 16 Trip device, 17, 21 Switching contact, 18, 35 Communication unit, 20 Branch circuit, 30 Current sensor, 31 Current measurement unit, 32 Voltage measurement unit, 34, 44 Operation unit, 36, 43 Display unit, 40 Wired communication unit, 41 Wireless communication unit, 100, 101 Measurement system.

Claims

1. Branch circuit breakers are placed in each of the multiple branch circuits, An auxiliary sensor device connected to each of the aforementioned branch circuit breakers for measuring the energized state of the branch circuit, The system comprises a state monitoring unit that is paired with the aforementioned auxiliary sensor device and displays the power supply status measured by the aforementioned auxiliary sensor device, The attached sensor device displays the status of the attached sensor device and the communication status with the status monitoring unit, and upon receiving an operation from the user, it sends a display request to the status monitoring unit to display the measured energization status of the branch circuit. When the status monitoring unit receives the display request from the attached sensor device, it displays the energized state of the branch circuit based on the display request. A measurement system characterized by the following features.

2. The state monitoring unit determines, based on the energization status received from the attached sensor device, whether the current value of the branch circuit exceeds a preset alarm threshold, and if it determines that the current value exceeds the alarm threshold, it displays alarm information indicating that the current value of the branch circuit exceeds the alarm threshold. The measurement system according to feature 1.

3. The attached sensor device determines whether the current value of the branch circuit exceeds a preset alarm threshold, and if it determines that the current value exceeds the alarm threshold, it displays alarm information indicating that the current value of the branch circuit exceeds the alarm threshold. The measurement system according to claim 2, characterized by the features described above.

4. The state monitoring unit determines, based on the energization status received from the attached sensor device, whether the current value of the branch circuit exceeds a preset rated current value, and if it determines that the current value exceeds the rated current value, it displays alarm information indicating that the current value of the branch circuit exceeds the rated current value. The measurement system according to any one of claims 1 to 3.

5. The attached sensor device determines whether the current value of the branch circuit exceeds a preset rated current value, and if it determines that the current value exceeds the rated current value, it displays alarm information indicating that the current value of the branch circuit exceeds the rated current value. The measurement system according to feature 4.

6. It is located in the main circuit connected to the power supply, and further comprises a main circuit breaker to which the branch circuits are connected, The main circuit breaker measures the current value of the main circuit, determines whether the current value exceeds a preset alarm threshold, and if it determines that the alarm threshold has been exceeded, it sends a display request to the status monitoring unit to display alarm information. The status monitoring unit displays alarm information indicating that the current value of the main circuit exceeds the alarm threshold. The measurement system according to any one of claims 1 to 3.

7. The main circuit breaker measures the current value of the main circuit, determines whether the current value exceeds a preset rated current value, and if it determines that the rated current value is exceeded, it transmits a display request to the status monitoring unit to display alarm information. The status monitoring unit displays alarm information indicating that the current value of the main circuit exceeds the rated current value. The measurement system according to claim 6.

8. An auxiliary sensor device connected to branch circuit breakers arranged in multiple branch circuits, for measuring the energized state of the branch circuits, A current measuring unit for measuring the current value of the branch circuit, An information processing unit that calculates the current value measured by the current measuring unit, A control unit that receives input from the user, A communication unit that outputs the power supply status of the branch circuit, calculated by the information processing unit, to a paired external unit when the user operates the control unit, It includes a display unit that displays the status of the attached sensor device and the communication status with the external unit. An accessory sensor device characterized by the following features.