JP5091799B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker.

  Conventionally, various circuit breakers have been proposed. For example, Patent Document 1 discloses a current transformer that detects a current of a current-carrying main conductor, a transformer that detects a voltage of a current-carrying main conductor, and current-carrying information (current, voltage, power, An arithmetic circuit that calculates the amount of power, an alarm signal output circuit that outputs an alarm according to the value of each energization information, and an external display device (display device that displays energization information of the circuit breaker) Communication interface circuit for communication, switch section for turning on / off the main conductor circuit, power supply circuit, current detection circuit for inputting current signal of current transformer to arithmetic circuit, arithmetic circuit for voltage signal of transformer And a tripping circuit for controlling a switch unit are disclosed.

  In the arithmetic circuit described above, arithmetic processing is performed based on the input current information and voltage information, and a signal for driving the tripping circuit and a signal for driving the alarm signal output circuit (on the alarm means connected to the outside) And a signal for driving the communication interface circuit (a signal for energization information measurement display input to a display device connected to the outside).

On the other hand, Patent Document 2 is composed of a circuit breaker body and an energization information measuring device disposed in the vicinity thereof, and the circuit breaker body has a measurement circuit for detecting the current flowing through the energized main conductor with a current transformer or the like. A device provided with current detection means is described. Also, in Patent Document 3, information related to the tripping control of the circuit breaker main body or the energization current during normal use is written and held in the EEPROM, and the portable power supply device or the external display device is connected when the information needs to be read. In addition, there is described what reads information from the EEPROM and displays it on a display unit or an external display device.
Japanese Patent No. 3720693 Japanese Patent No. 3955706 Japanese Patent No. 2981059

  In the above-described Patent Documents 1 to 3, since the current flowing through the circuit breaker can be detected, by performing a regular inspection (confirmation of the current value flowing through the circuit breaker), abnormalities such as leakage can be detected. It can be detected at an early stage.

  However, in the above-described Patent Documents 1 to 3, the date (inspection date) on which the inspection is performed cannot be confirmed. Therefore, it takes time to specify the location of leakage and the cause of leakage. Further, in order to confirm the inspection date, it is necessary for the person who performed the inspection to record the inspection date each time, which is troublesome.

  In addition, it is conceivable to construct a system for automatically inspecting using a circuit breaker as shown in these Patent Documents 1 to 3 and an external processing device, in order to construct such a system. Has the problem of requiring large investments.

  This invention is made in view of the above-mentioned point, and is providing the circuit breaker which can confirm an inspection date.

  In order to solve the above-described problem, the invention of claim 1 includes a primary side terminal portion connected to the power system and a secondary side terminal portion connected to the load, and the opening / closing portion is connected to the primary side terminal portion and the second side terminal portion. A container housed in a form to be inserted between the secondary terminal part, an operation part for manual operation that is exposed to the container body, an opening / closing mechanism part that opens and closes the opening / closing part according to the operation of the operation part, A tripping part that releases the opening / closing part when an abnormality occurs, a current detection part that detects a current flowing in the electric circuit between the primary side terminal part and the secondary side terminal part, a connection terminal part to which an external device is connected, A current value calculation unit for calculating a current value of the electric circuit based on a detection output of the current detection unit; a communication unit for communicating with an external device connected to the connection terminal unit; and a storage unit for storing data. An arithmetic processing unit that transmits the calculation result of the current value calculation unit to an external device in response to the request of Provided, the processing unit is characterized in that is stored upon receiving the examination date data transmitted from an external device that receives the operation result the examination date data in the storage unit.

  According to the first aspect of the invention, since the inspection date data sent from the external device when the current value is transmitted to the external device is stored in the storage unit, the inspection date data stored in the storage unit is read out. Thus, the inspection date can be confirmed. Therefore, it is possible to know how long it has been normal, and it is also possible to confirm whether there has been an inspection failure. Furthermore, since the user does not need to record the inspection date, the inspection can be easily performed.

  According to a second aspect of the present invention, in the first aspect of the invention, the calculation processing unit associates the calculation result of the current value calculation unit with the inspection date data when storing the inspection date data in the storage unit. It is memorized.

  According to the invention of claim 2, since not only the inspection date but also the current value of the inspection date can be known, the history of abnormality such as a leakage history can be grasped in more detail.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the storage unit is a nonvolatile memory.

  According to the invention of claim 3, when the electric power is not supplied, it is possible to prevent the inspection date data from being lost.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the nonvolatile memory is an EEPROM.

  According to the invention of claim 4, since the EEPROM can write and erase data only by electrical operation, it is not necessary to prepare a special device unlike the UV-EPROM using ultraviolet rays. Cost reduction can be achieved.

  The present invention has an effect that the inspection date can be confirmed.

  Hereinafter, a circuit breaker according to an embodiment of the present invention will be described by taking a branch breaker 1 used in a distribution board (electric panel) SB as shown in FIG. 2 as an example. The distribution board SB is used, for example, in an AC 50 Hz or 60 Hz single-phase three-wire 100 / 200V power system.

  The distribution board SB supplies power to a main circuit breaker (main switch) 2 and an electric device (not shown) that is branched from a main circuit (bus) 3 connected to the secondary side of the main circuit breaker 2. A plurality (14 in the illustrated example) of branch breakers (branch switches) 1 provided on the branch electric circuit (branch line) 4 and a cabinet 5 in which these are housed (in which these are incorporated) are provided.

  In such a distribution board SB, using an inspection device 6 (see FIG. 1B) which is an external device, the current value of the branch breaker 1 (the current value flowing through the branch breaker 1, in other words, the branch breaker 1). A test is performed to measure the current value of the branch circuit 4 to which is connected. That is, the branch breaker (circuit breaker) 1 and the inspection device 6 constitute an inspection system.

  The main breaker 2 has, for example, a function of manually switching the conduction state between the single-phase three-wire low-voltage distribution line 100 and the main electric circuit 3, and a function of tripping when an abnormality such as an overload current, a short-circuit current, or a leakage current occurs. Have. The main electric circuit 3 and the branch electric circuit 4 are conductive bars formed of a metal material (for example, copper) having good conductivity. The cabinet 5 is formed in a box shape with an open front surface, and includes a box in which the main breaker 2 and the branch breaker 1 are housed, a door that opens and closes the front opening of the box, and the like. In addition, about the main breaker 2, the main electric circuit 3, the branch electric circuit 4, and the cabinet 5, since a conventionally well-known thing can be employ | adopted, detailed description is abbreviate | omitted.

  As shown in FIG. 1A, the branch breaker 1 includes a primary side terminal portion 10 connected to an electric power system and a secondary side terminal portion 11 connected to an electric device (load). A container body 1a is provided that is inserted between the primary side terminal portion 10 and the secondary side terminal portion 11 and stored. The primary side terminal portion 10 is formed in a shape that can connect the branch electric circuit 4, and the secondary side terminal portion 11 is formed in a shape that can connect a power supply line (not shown) of a load. As the configurations of the primary side terminal portion 10 and the secondary side terminal portion 11, conventionally known configurations can be appropriately employed.

  The opening / closing part 12 is composed of a mechanical contact composed of a fixed contact fixed to the body 1a and a movable contact contacting and leaving the fixed contact. For example, while the fixed contact of the opening / closing part 12 is electrically connected to the secondary side terminal part 11, the movable contact is electrically connected to the primary side terminal part 10, and the movable contact contacts the fixed contact. If the open / close section 12 is closed, the electrical path between the primary terminal section 10 and the secondary terminal section 11 is closed, and the movable contact is not in contact with the fixed contact. If the opening / closing part 12 is opened, the electrical path between the primary side terminal part 10 and the secondary side terminal part 11 is opened, and a non-conductive state is established.

  Further, the branch breaker 1 includes an opening / closing mechanism unit 14 that opens and closes the opening / closing unit 12, an operation unit 13 and a tripping unit 15 that are mechanically connected to the opening / closing mechanism unit 14.

  The operation unit 13 is for manually opening and closing the opening / closing unit 12, and as shown in FIG. 2, the operation unit 13 can be displaced to the body 1 a, for example, a closing position for closing the opening / closing unit 12 and opening the opening / closing unit 12. It consists of an operating handle that is pivotably attached to an open position.

  The opening / closing mechanism unit 14 includes various members such as a fixed terminal plate to which the fixed contact of the opening / closing unit 12 is fixed, a movable contact to which the movable contact of the opening / closing unit 12 is fixed, a spring material, and a locking member. The opening and closing unit 12 is opened and closed according to the operation of the operation unit 13. Specifically, the opening / closing mechanism unit 14 closes the opening / closing unit 12 when the operation unit 13 is in the closing position, and opens the opening / closing unit 12 when the operation unit 13 is in the open position. As such an opening / closing mechanism section 14, a conventionally known one can be adopted, and detailed description thereof will be omitted.

  The tripping part 15 forcibly releases (opens) the opening / closing part 12 when an abnormality occurs, and includes an overload tripping device 15a, a short-circuit tripping device 15b, and a leakage tripping device 15c. Yes.

  The overload trip device 15a releases the opening / closing part 12 when an overload current flows in the electrical path between the primary side terminal part 10 and the secondary side terminal part 11, for example, the primary side terminal It is comprised by the bimetal inserted in the electrical circuit between the part 10 and the secondary side terminal part 11. FIG. That is, when an overload current flows and the bimetal temperature rises above a predetermined value, the bimetal is deformed, and this is used as a trigger to forcibly release the opening / closing part 12.

  The short-circuit trip device 15b releases the opening / closing part 12 when a short-circuit current flows in the electric path between the primary-side terminal connection part 10 and the secondary-side terminal part 11. The short-circuit trip device 15b includes, for example, a coil that is inserted into the electric circuit and generates an electromagnetic field having a predetermined strength when a short-circuit current flows, a fixed iron core provided on one end side in the axial direction in the coil, A movable iron core (plunger) provided on the other end side in the axial direction so as to be slidable in the axial direction, and a return spring composed of a coil spring interposed between the fixed iron core and the movable iron core are provided. In this configuration, when a short-circuit current flows through the coil, the movable iron core moves to the fixed iron core side, and thereby, the movable contact of the opening / closing part 12 is detached from the fixed contact.

  The earth leakage trip device 15c releases the opening / closing part 12 when an earth leakage occurs (when an unbalanced current flows). For example, a cylindrical coil bobbin, a coil wound around the outer peripheral surface of the coil bobbin, A fixed iron core provided on one end in the axial direction in the coil bobbin, a movable iron core (plunger) slidably provided in the axial direction on the other axial end in the coil bobbin, and a fixed iron core and a movable iron core. It consists of an electric trip device provided with a return spring composed of a coil spring interposed therebetween. In this configuration, when the coil is energized, the movable iron core moves to the fixed iron core side, whereby the movable contact of the opening / closing part 12 is configured to be detached from the fixed contact. Such a leakage trip device 15 c is controlled by the leakage determination processing unit 16.

  The leakage determination processing unit 16 is, for example, a microcomputer (microcontroller, abbreviated as a microcomputer, also referred to as a CPU in a broad sense), and executes various processes described later by executing a program stored in a memory by the CPU. Run. This leakage determination processing unit 16 is based on the detection output of the zero-phase current transformer ZCT that detects whether or not an unbalanced current is generated in the electric circuit between the primary side terminal unit 10 and the secondary side terminal unit 11. Then, a process for determining whether or not a leakage has occurred is executed. If the leakage determination processing unit 16 determines that leakage has occurred as a result of the processing, the leakage detection device 15c drives the leakage trip device 15c to release the opening / closing unit 12.

  Therefore, in the branch breaker 1, when an overcurrent such as an overload current or a short-circuit current or an abnormality such as a leakage occurs, the opening / closing part 12 is released and the power supply to the load is stopped. The overload tripping device 15a, the short-circuit tripping device 15b, and the leakage tripping device 15c as described above are well known in the art and will not be described in detail.

  Further, the branch breaker 1 includes a current detection unit 17 that detects a current flowing in an electric circuit between the primary terminal unit 10 and the secondary terminal unit 11 (in other words, the branch electric circuit 4 corresponding to the branch breaker 1); An arithmetic processing unit 18 that calculates the current value of the branch circuit 4 based on the detection output of the current detection unit 17 is provided. The current detection unit 17 and the arithmetic processing unit 18 constitute an inspection unit that performs an inspection in response to a request from the inspection device 6.

  The current detection unit 17 is a current sensor for detecting the current value of the branch electric circuit 4 corresponding to the branch breaker 1. The current detection unit 17 in the present embodiment is a current sensor made of a toroidal coil (Rogowski coil) formed by a conductor pattern of a printed circuit board (not shown), for example, and outputs a current differential form as a detection output. Such a toroidal coil is formed on the surface of the printed circuit board through a through hole (not shown) around the insertion hole (not shown) that penetrates the printed circuit board in the thickness direction and through which the branch circuit 4 is inserted. The formed pattern and the pattern formed on the back surface are connected to each other so that a direction around the periphery of the insertion hole is a winding axis direction.

  Thus, if the toroidal coil formed with the conductor pattern of a printed circuit board is used as the current detection part 17, even if the space in the container 1a is narrow like the branch breaker 1, the current detection part 17 can be arrange | positioned efficiently. . Further, since the toroidal coil has an air core, there is no iron core (magnetic core), so that the size and weight can be reduced. In addition, there is an advantage that there is no saturation due to the iron core, whereby a current sensor having a wide dynamic range and capable of detecting a large current can be obtained.

  As shown in FIG. 1A, the calculation processing unit 18 includes a current value calculation unit 180, a communication unit 181 for communicating with the inspection apparatus 6, and a control unit (hereinafter, measurement side control unit) that controls these. 182) and a storage unit 183 in which various data are stored. Such an arithmetic processing unit 18 is provided on the printed circuit board together with the current detection unit 17. The arithmetic processing unit 18 may be configured by individually mounting necessary electronic components such as discrete semiconductors on a printed circuit board, or may be configured by integrating (integrating) necessary electronic components. Good.

  The current value calculation unit 180 calculates the current value of the branch circuit 4 based on the detection output of the current detection unit 17, and starts the calculation of the current value when receiving a measurement start signal to be described later. When the calculation is completed, a measurement end signal is output to the measurement-side control unit 182. Such a current value calculation unit 180 includes an amplification unit 180a that amplifies the detection output of the current detection unit 17, an integration unit 180b that integrates the detection output output in a differential form and outputs a signal indicating a current waveform, An effective value calculation unit 180c that calculates the effective value of the current waveform obtained by the integration unit 180b as a current value; an A / D conversion unit 180d that converts the current value calculated by the effective value calculation unit 180c into digital data; And a memory unit 180e in which measurement data including current values converted into digital data by the A / D conversion unit 180d is stored.

  The communication unit 181 executes processing for outputting a test trigger reception signal to the measurement-side control unit 182 when a test trigger signal described later is received, and receives the history trigger reception signal when the test trigger signal described later is received. Processing to be output to the control unit 182 is executed. In addition, when receiving communication date data, which will be described later, from the inspection device 6, the communication unit 181 executes processing for decoding the inspection date data (transmission path decoding) and outputting the data to the measurement-side control unit 182. On the other hand, when the communication unit 181 receives a measurement data transmission signal to be described later, the communication unit 181 acquires the measurement data from the memory unit 180e of the current value calculation unit 180, encodes the measurement data (encodes the transmission path), and inspects the inspection device 6. Execute the process to send to. In addition, when receiving a history data transmission signal to be described later, the communication unit 181 executes processing for acquiring history data from the storage unit 183, encoding the history data (transmission path encoding), and transmitting the history data to the inspection device 6. To do. Here, the history data is data obtained by collecting the inspection date data received from the inspection device 6 and the measurement data corresponding to the inspection date data.

  The storage unit 183 is a storage device having a rewritable storage area. In this embodiment, an EEPROM that is a kind of nonvolatile memory that can hold data without supplying power is used as the storage unit 183.

  The measurement-side control unit 182 includes a microcomputer that performs various processes, for example, when the CPU executes a program stored in a memory. When the measurement trigger reception signal is received, the measurement-side control unit 182 converts the measurement start signal into a current. A process of outputting to the value calculation unit 180 is executed. In addition, when the measurement-side control unit 182 receives the measurement end signal from the current value calculation unit 180 after outputting the measurement start signal, the measurement-side control unit 182 executes processing for outputting the above-described measurement data transmission signal to the data transmission unit 181. Further, upon receiving the inspection date data, the measurement-side control unit 182 stores the inspection date data in the storage unit 183 and stores the measurement data in association with the corresponding inspection date data (stores the history data in the storage unit 183). Process). In addition, when receiving the history trigger reception signal, the measurement-side control unit 182 executes processing for outputting the above-described history data transmission signal to the data transmission unit 181.

  The container body 1a of the branch breaker 1 as described above is provided with a connection terminal portion 19 for connecting the inspection device 6. The connection terminal unit 19 includes a communication terminal 19a connected to the communication unit 181 and a power receiving terminal 19c connected to the measurement-side control unit 182 for receiving supply of power for driving the arithmetic processing unit 18 from an external power supply device. Have.

  Next, the inspection device 6 used for the inspection of the branch breaker 1 will be described. The inspection device 6 is for inspecting the branch breaker 1 (inspecting the branch electric circuit 4 to which the branch breaker 1 is connected) and checking the inspection date.

  As shown in FIG. 1 (b), the inspection device 6 includes a container body 6 a that is formed in a size that can be carried by a person who performs the inspection, and the container body 6 a is configured to communicate with the branch breaker 1. A communication unit 60, a storage unit 61 that includes a rewritable storage device such as a flash memory and stores measurement data, a display unit 62 that includes an image display such as a liquid crystal display (LCD), and a control that controls these units Unit (hereinafter referred to as an inspection side control unit) 63, an operation unit 64 for operating the inspection device 6, a clock unit 65 for obtaining an inspection date, and an arithmetic processing unit 18 of the inspection device 6 and the branch breaker 1. A power supply unit 66 is housed that includes a power supply device that supplies power to the power supply (a power supply that is electrically independent of the power system to which the branch breaker 1 is connected, for example, a primary battery).

  The communication unit 60 executes processing for transmitting the above-described inspection trigger signal when receiving an inspection trigger transmission signal described later. Further, when receiving a history trigger transmission signal, which will be described later, the communication unit 60 executes processing for transmitting the history trigger signal described above. Here, the inspection trigger signal and the history trigger signal are high (for example, 5V) and low (for example, 0V) digital signals (for example, 1-byte signals of “000001010”). The inspection trigger signal and the history trigger signal may be analog signals, but the digital signal is generally more resistant to noise than the analog signal. Malfunctions can be prevented.

  Further, the communication unit 60 executes a process of encoding (transmission path encoding) and transmitting the inspection date data when receiving an inspection date data transmission signal to be described later. Here, the inspection date data is data created by the inspection-side control unit 63 based on the date and time obtained from the clock unit 65 (that is, the current date and time). Note that the examination date data may simply indicate the date, not the date and time.

  Further, the communication unit 60 decodes the measurement data received from the branch breaker 1 (transmission path decoding) and outputs it to the inspection-side control unit 64, and decodes (transmits) the history data received from the branch breaker 1. (Path decoding) and output to the inspection side control unit 64.

  The inspection-side control unit 63 is composed of, for example, a microcomputer that performs various processes when the CPU executes a program stored in a memory, and an inspection start button (not shown) provided on the operation unit 64 is provided. When operated, the process of outputting the above-described inspection trigger transmission signal to the communication unit 60 is executed. After outputting the inspection trigger transmission signal, the inspection-side control unit 63 shifts to a standby state where it waits for a response (measurement data) of the branch breaker 1. The standby state ends when the measurement data is obtained from the branch breaker 1 or when the counter of the timer started when the inspection trigger transmission signal is output reaches a predetermined value.

  Here, when the measurement data is obtained before the timer counter reaches the predetermined value, the inspection-side control unit 63 executes a process of outputting the above-described inspection date data transmission signal to the communication unit 60. Thereafter, the inspection-side control unit 63 executes a process of displaying the inspection information by causing the display unit 62 to display the current value obtained from the measurement data and the inspection date and time. In addition to the current value obtained from the measurement data, the content displayed on the display unit 62 includes the presence / absence of current in the branch circuit 4 and the current level based on the current value (how much current is flowing stepwise. Or a character indicating a warning such as “excessive” depending on the magnitude of the current value).

  On the other hand, even when the timer count reaches a predetermined value (that is, even if a predetermined time elapses from the output of the trigger signal for inspection), no response is obtained from the branch breaker 1 (measurement data cannot be obtained). The inspection-side control unit 63 determines that an abnormality has occurred. In this case, the inspection-side control unit 63 performs a process of displaying that an abnormality has occurred on the display unit 62 (a process of displaying abnormality information). Note that the predetermined time as a criterion for detecting abnormality is determined based on the time required for calculating the current value in the branch breaker 1, the communication speed between the branch breaker 1 and the inspection device 6, and the like. The timer counter is reset to 0 when the inspection start button of the operation unit 64 is operated or when measurement data is received.

  In addition, when a history display button (not shown) provided on the operation unit 64 is operated, the inspection-side control unit 63 executes processing for outputting the history trigger transmission signal to the communication unit 60.

  After outputting the history trigger transmission signal, the inspection-side control unit 63 shifts to a standby state waiting for a response (history data) of the branch breaker 1. The standby state ends when the history data is obtained from the branch breaker 1 or when the counter of the timer started when the history trigger transmission signal is output reaches a predetermined value.

  Here, when the history data is obtained before the timer counter reaches the predetermined value, the inspection-side control unit 63 causes the display unit 62 to display the inspection date and the current value obtained from the history data, A process for displaying history information is executed.

  On the other hand, even if the timer count reaches a predetermined value (that is, even if a predetermined time elapses from the output of the history trigger signal), no response is obtained from the branch breaker 1 (history data cannot be obtained). The inspection-side control unit 63 determines that an abnormality has occurred. In this case, the inspection-side control unit 63 performs a process of displaying that an abnormality has occurred on the display unit 62 (a process of displaying abnormality information). Note that the predetermined time, which is a criterion for detecting abnormality, is determined based on the communication speed between the branch breaker 1 and the inspection device 6. The timer counter is reset to 0 when the history display button of the operation unit 64 is operated or when history data is received.

  In addition, a connecting terminal portion 67 for connecting the branch breaker 1 is provided on the body 6a of the inspection device 6. The connection terminal unit 67 includes a communication terminal 67 a connected to the communication unit 60 and a power supply terminal 67 b connected to the power supply unit 66 for supplying driving power to the arithmetic processing unit 18.

  Such an inspection device 6 is connected to the branch breaker 1 by a connection line 7. The connection line 7 includes a communication line 70 that connects the communication terminal 19a of the branch breaker 1 and the communication terminal 67a of the inspection device 6, and a power supply line that connects the power receiving terminal 19c of the branch breaker 1 and the power supply terminal 67b of the inspection device 6. 71.

  When the inspection device 6 is connected to the branch breaker 1 by the connection line 7, the communication unit 181 of the branch breaker 1 and the communication unit 60 of the inspection device 6 are connected by the communication line 70, and the branch breaker 1 and the inspection device 6 are connected. Communication between the two is established. In addition, since the power supply terminal 67 b of the inspection device 6 is connected to the power receiving terminal 19 b of the branch breaker 1 by the power line 71, power is supplied from the power supply unit 66 to the arithmetic processing unit 18 of the branch breaker 1.

  Next, operations of the branch breaker 1 and the inspection device 6 at the time of inspection will be described with reference to FIGS. When performing an inspection using the inspection device 6, the inspection device 6 and the branch breaker 1 are connected by the connection line 7. Thereby, the communication terminal 19a of the branch breaker 1 and the communication terminal 67a of the inspection device 6 are connected by the communication line 70, and communication between the branch breaker 1 and the inspection device 6 becomes possible. Further, since the power supply unit 66 is connected to the arithmetic processing unit 18, the arithmetic processing unit 18 of the branch breaker 1 is activated.

  When power is supplied to the arithmetic processing unit 18 and activated, the arithmetic processing unit 18 determines whether or not the inspection trigger signal has been received by the communication unit 181 (step S11) and whether or not the history trigger signal has been received. It is determined whether or not (step S18).

  When the inspection trigger signal is received, the communication unit 181 outputs the inspection trigger reception signal to the measurement side control unit 182, and the measurement side control unit 182 that has received the inspection trigger reception signal supplies the current value calculation unit 180. A measurement start signal is output, and current value calculation is started by the current value calculation unit 180 (step S13). When the calculation of the current value ends, the current value calculation unit 180 stores the current value as measurement data in the memory unit 180e, and outputs a measurement end signal to the measurement-side control unit 182 (step S14). The measurement-side control unit 182 that has received the measurement end signal outputs a measurement data transmission signal to the communication unit 181, and the communication unit 181 acquires measurement data from the memory unit 180 e and transmits it to the inspection device 6 (step S 14). .

  Then, it will be in a standby state until inspection date data is obtained from the inspection device 6 (steps S15 and S16). When the communication unit 181 receives the inspection date data (Yes in step S16), the inspection side data is sent to the measurement side control unit 182. Output. Upon receiving the inspection date data, the measurement-side control unit 182 stores the inspection date data and the measurement data in association with each other in the storage unit 183 (step S17), thereby completing a series of operations.

  When the history trigger signal is received, the communication unit 181 outputs the history trigger reception signal to the measurement-side control unit 182. The measurement-side control unit 182 that has received the history trigger reception signal outputs a history data transmission signal to the communication unit 181, and the communication unit 181 acquires the history data from the storage unit 183 and transmits it to the inspection device 6 (step). S19). This completes a series of operations.

  On the other hand, in the inspection device 6, a determination is made as to whether the inspection start button of the operation unit 64 has been operated (step S21) and a determination as to whether the history display button has been operated (step S30).

  When the user operates the inspection start button, the inspection-side control unit 63 outputs an inspection trigger transmission signal to the communication unit 60. The communication unit 60 that has received the inspection trigger transmission signal transmits the inspection trigger signal (step S22). Further, the inspection-side control unit 63 shifts to a standby state in which the response (measurement data) of the branch breaker 1 is awaited from when the inspection trigger transmission signal is output (step S23), and starts a timer (step S24).

  If the measurement data is obtained before the predetermined time has elapsed (Yes in step S25), the inspection-side control unit 63 outputs an inspection date data transmission signal to the communication unit 60, and outputs the inspection date data transmission signal. The received communication unit 60 transmits the inspection date data to the branch breaker 1 (step S26). Thereafter, the inspection-side control unit 63 displays the inspection information by displaying the current value obtained from the measurement data and the inspection date and time on the display unit 62 (step S27), thereby completing a series of operations.

  By the way, if the predetermined time has passed without obtaining measurement data after step S24 (Yes in step S28), the inspection-side control unit 63 determines that an abnormality has occurred and displays the display unit 62. Is displayed to indicate that an abnormality has occurred (step S29), thereby completing a series of operations.

  When the user operates the history display button, the inspection-side control unit 63 outputs a history trigger transmission signal to the communication unit 60, and the communication unit 60 that has received the history trigger transmission signal receives the history trigger signal. Is transmitted (step S31). The inspection-side control unit 63 shifts to a standby state where the response (history data) of the branch breaker 1 is awaited from when the history trigger transmission signal is output (step S32), and starts a timer (step S33).

  If the history data is obtained before the predetermined time has elapsed (Yes in step S34), the inspection-side control unit 63 causes the display unit 62 to display the inspection date and current value obtained from the history data. Then, the history information is displayed (step S35), and the series of operations is thereby completed. On the other hand, if a predetermined time has passed without obtaining history data after step S33 (Yes in step S36), the inspection-side control unit 63 determines that an abnormality has occurred and displays the display unit 62. Is displayed to indicate that an abnormality has occurred (step S37), thereby completing a series of operations.

  As described above, the branch breaker 1 includes the arithmetic processing unit 18, and the arithmetic processing unit 18 calculates the current value of the branch circuit 4 based on the detection output of the current detection unit 17. And a communication unit 181 that communicates with the inspection device 6 connected to the connection terminal unit 19, a control unit 182, and a storage unit 183 that stores data. And the arithmetic processing part 18 is transmitted from the test | inspection apparatus 6 which received the calculation result and the function which transmits the calculation result (measurement data) of the electric current value calculating part 180 to the test | inspection apparatus 6 according to the request | requirement of the test | inspection apparatus 6. A function of storing the inspection date data in the storage unit 183.

  Therefore, according to the branch breaker 1 of the present embodiment, the inspection date can be confirmed by reading the inspection date data stored in the storage unit 183.

  Here, if an abnormality such as electric leakage has occurred when the inspection is performed, the repair work is performed, so that it can be considered normal at least until the inspection date. Therefore, by checking the inspection date, it can be known how long it has been normal (how long the branch circuit 4 to which the branch breaker 1 is connected has been normal). Further, it is possible to confirm whether there is an inspection omission by checking the inspection schedule with the date of the inspection date data stored in the storage unit 183. Furthermore, since it is not necessary for the user to record the inspection date as in the prior art, the inspection can be easily performed.

  Further, since the storage unit 183 is a non-volatile memory, the inspection date data is not lost when power is not supplied from the power supply unit 66. Therefore, it is not necessary to connect the inspection device 6 to the branch breaker 1 at all times. In the present embodiment, the operating power of the arithmetic processing unit 18 is obtained from the power supply unit 66. However, it may be obtained from the power system. In such a case, an abnormality occurs in the power system and power supply stops. Even if it is done, the inspection date data can be held. In particular, an EEPROM is used as a non-volatile memory used for the storage unit 183. Since the EEPROM can write and erase data only by an electric operation, it is different from a UV-EPROM that uses ultraviolet rays. Since it is not necessary to prepare a simple device, the cost can be reduced.

  Further, when storing the inspection date data in the storage unit 183, the arithmetic processing unit 18 stores the calculation result of the current value calculation unit 180 in association with the inspection date data, so that not only the inspection date but also the current of the inspection date is stored. Since the value can also be known, the history of abnormality can be grasped in more detail when an abnormality (such as electric leakage) has occurred.

  By the way, in the present embodiment, only the history data having the latest examination date is left in the storage unit 183, but the past history data may be left without being erased. If there are a plurality of history data in the storage unit 183, all the history data may be transmitted to the inspection device 6. In the above example, not only the inspection date data but also the measurement data is stored in the storage unit 183. However, only the inspection date data may be stored in the storage unit 183.

  In addition, this embodiment is only one embodiment of the present invention, and is not intended to limit the technical scope of the present invention to this embodiment. For example, the circuit breaker of the present invention is not limited to a branch breaker, but can also be used for a main breaker or the like.

(A) is a block diagram of the branch breaker of one Embodiment of this invention, (b) is a block diagram of an inspection apparatus. It is a block diagram of a distribution board using the same branch breaker. It is a flowchart of operation | movement of a branch breaker. It is a flowchart of operation | movement of an inspection apparatus.

Explanation of symbols

1 Branch breaker (circuit breaker)
1a Body 6 Inspection device (external device)
DESCRIPTION OF SYMBOLS 10 Primary side terminal part 11 Secondary side terminal part 12 Opening and closing part 13 Operation part 14 Opening and closing mechanism part 15 Tripping part 17 Current detection part 18 Operation processing part 19 Connection terminal part 180 Current value calculation part 181 Communication part 183 Storage part

Claims (4)

A container having a primary terminal connected to the power system and a secondary terminal connected to a load, and storing the open / close part between the primary terminal and the secondary terminal. An operation unit for manual operation that is exposed on the body, an opening / closing mechanism unit that opens and closes the opening / closing unit according to the operation of the operation unit, a tripping unit that releases the opening / closing unit when an abnormality occurs, and a primary terminal A current detection unit that detects a current flowing in the circuit between the power supply unit and the secondary terminal unit, a connection terminal unit to which an external device is connected, and a current value of the circuit based on the detection output of the current detection unit A current value calculation unit, a communication unit that communicates with an external device connected to the connection terminal unit, and a storage unit that stores data, and the calculation result of the current value calculation unit is transmitted to the external device in response to a request from the external device. An arithmetic processing unit to transmit,
The circuit breaker, wherein the arithmetic processing unit stores the inspection date data in the storage unit when receiving the inspection date data transmitted from the external device that has received the calculation result.   2. The circuit interruption according to claim 1, wherein the arithmetic processing unit stores the calculation result of the current value calculation unit in association with the inspection date data in storing the inspection date data in the storage unit. vessel.   The circuit breaker according to claim 1, wherein the storage unit is a nonvolatile memory.   4. The circuit breaker according to claim 3, wherein the nonvolatile memory is an EEPROM.

Images