JP2010044947A - Circuit breaker and distribution board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker and a distribution board, which can accurately measure the current even if an unusual condition occurs in a power system. <P>SOLUTION: A branch breaker 1 is a circuit breaker comprising: a casing 1a having a primary side terminal part 10 connected to a power system and a secondary side terminal part 11 connected to a load and housing a switch part 12 by inserting it between the terminal parts 10 and 11; a switch mechanism section 14 for opening/closing the switch part 12 in response to operation of an operating section 13 provided in the casing 1a, being exposed; a releasing section 15 for releasing the switch part 12 when an unusual condition occurs; a current detecting part 17 for detecting the current flowing in an electrical passage between the terminal parts 10 and 11; and a computing section 18 having a current computing section 180 for computing a current value of the electrical passage based on an output of detection by the current detecting section 17, and a communicating section 181 for transmitting a result of computing of the current computing section 180 to the inspecting device 6. The computing section 18 receives power from a power source 66 electrically separated from the power system. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a circuit breaker and a distribution board.

  As a circuit breaker proposed conventionally, there exists a thing shown in patent document 1, 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 the switch unit.

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).
Japanese Patent No. 3720693

  However, in what is shown in Patent Document 1, power is supplied to the arithmetic circuit from the power system to which the circuit breaker is connected. Therefore, when abnormal voltage occurs in the power system due to lightning surges or various causes, the arithmetic circuit may malfunction or fail due to such abnormal voltage. There was something I couldn't do.

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a circuit breaker and a distribution board capable of performing accurate current measurement even when an abnormality occurs in a power system.

  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, Based on the tripping part that releases the opening and closing part when an abnormality occurs, the current detection part that detects the current flowing in the electric circuit between the primary side terminal part and the secondary side terminal part, and the detection output of the current detection part A current value calculation unit that calculates the current value of the electric circuit and a calculation processing unit that has a transmission unit that transmits the calculation result of the current value calculation unit to an external device, and the calculation processing unit is electrically connected to the power system. It is characterized by receiving power supply from an independent power supply.

  According to the first aspect of the present invention, the arithmetic processing unit receives power supply from a power supply device that is electrically independent of the power system to which the primary terminal unit is connected. However, even if an abnormal voltage occurs in the power system due to lightning surges or various other causes, malfunctions or failures will not occur due to such abnormal voltage. Even accurate current measurements can be made.

  According to a second aspect of the present invention, in the first aspect of the invention, the current detection unit includes a plurality of radial shapes arranged on the front surface side and the back surface side of the periphery of the opening provided in the printed board and through which the electric circuit is inserted. Winding direction is the direction around the periphery of the opening by the line and through-hole wiring that electrically connects the end of the radial line on the front side of the printed circuit board and the end of the radial line on the back side of the printed circuit board And the arithmetic processing unit is provided on the printed circuit board.

  According to the second aspect of the present invention, since the current detection unit and the arithmetic processing unit are provided on the printed circuit board, the space that can be used by the opening / closing unit, the opening / closing mechanism unit, the tripping unit, etc. is narrow. Since the current detection unit and the arithmetic processing unit can be efficiently arranged, the size can be reduced. In addition, since the current detection unit and the arithmetic processing unit can be connected by the conductor pattern of the printed circuit board, disconnection, etc., as compared with the case where the current detection unit and the arithmetic processing unit are connected using an electric wire (signal line). It is possible to suppress the occurrence of this problem during manufacturing. Furthermore, since the current detection unit is an air core toroidal coil, there is no iron core (magnetic core), so there is an advantage that it can be reduced in size and weight, and there is no saturation due to the iron core. Thus, it is possible to obtain a current sensor having a wide dynamic range and capable of detecting a large current.

  According to a third aspect of the invention, in the first or second aspect of the invention, the current value calculation unit calculates an error between the current value of the electric circuit calculated based on the detection output of the current detection unit and the actual current value. A correction value storage unit that stores a correction value for erasing, and a current value correction unit that corrects the current value of the electric circuit using the correction value stored in the correction value storage unit. The current value of the electric circuit corrected by the above is output as a calculation result.

  According to the invention of claim 3, even if there is a variation in the characteristics of the current detection unit for each product, the current value varies from product to product due to such variation, thereby preventing variation in detection accuracy. it can.

  According to a fourth aspect of the present invention, there is provided a power distribution device comprising: a main circuit breaker; and a plurality of branch circuit breakers each provided in a branch circuit that branches from the main circuit connected to the secondary side of the main circuit breaker and supplies electric power to the electrical equipment. It is a board, Comprising: A branch breaker is a circuit breaker of any one of Claims 1-3, It is characterized by the above-mentioned.

  According to the invention of claim 4, it is possible to easily identify a location where an overcurrent such as an overload current or a short-circuit current or an abnormality such as a leakage occurs.

  The present invention has an effect that accurate current measurement can be performed even if an abnormality occurs in the power system.

  Hereinafter, the circuit breaker of the present invention will be described based on an embodiment in which the circuit breaker is used as a branch breaker 1 of a distribution board (electric installation board) SB as shown in FIG. The distribution board SB is used in, for example, 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, the test | inspection apparatus 6 is used and the test | inspection which measures the electric current value of the branch breaker 1 (The electric current value of the branch electric circuit 4 to which the branch breaker 1 is connected) is performed.

  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 unit 15 forcibly releases (opens) the opening / closing unit 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, whereby 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. Execute. 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.

  Incidentally, the branch breaker 1 is provided with inspection means. The inspection means 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), and a current detection And an arithmetic processing unit 18 that calculates the current value of the branch circuit 4 based on the detection output of the unit 17.

  The current detector 17 is a current sensor for detecting the current value of the branch circuit 4 corresponding to the branch breaker 1, and is formed on the printed circuit board 8 as shown in FIG.

  The printed circuit board 8 has a multilayer structure in which a plurality of insulating plates are stacked (that is, a multilayer board). As shown in FIG. 3, the printed circuit board 8 is formed with a circular opening 80 penetrating the printed circuit board 8 on the front and back sides. The opening 80 has a primary terminal 10 and a secondary terminal. The conductive member P that electrically connects the part 11 is inserted. That is, the electric path between the primary side terminal portion 10 and the secondary side terminal portion 11 is inserted into the opening 80. The printed board 8 may be a double-sided board instead of a multilayer board.

  The current detection unit 17 includes a toroidal coil 170 formed in a shape in which a direction around the periphery of the opening 80 is a winding axis direction, and outputs a differential form of current as a detection output. The toroidal coil 170 includes a plurality of radial lines 170A and 170B arranged radially (separate from the opening 80) on the front surface side and the back surface side of the periphery of the opening 80 of the printed circuit board 8, and the radial line 170A on the front surface side. A through-hole wiring (not shown) in the through-hole 81 that electrically connects the end and the end of the radial line 170B on the back surface side is formed. In FIG. 3, the radial line 170A on the front surface side is indicated by a solid line, and the radial line 170B on the back surface side is indicated by a broken line.

  The radial lines 170 </ b> A and 170 </ b> B are formed of a conductor pattern formed linearly with a conductive material (for example, copper), and a plurality of radial lines 170 </ b> A and 170 </ b> B are formed at predetermined intervals along the circumferential direction of the opening 80. These radial lines 170 </ b> A and 170 </ b> B both extend in a direction away from the opening 80, and the extension line (extension line in the longitudinal direction) does not pass through the center of the opening 80. That is, both ends of the radial lines 170A and 170B are not located on the same straight line passing through the center of the opening 80, and the distances between the both ends and the center of the opening 80 are different distances.

  The plurality of radial lines 170A on the front surface side and the plurality of radial lines 170B on the back surface side are arranged in a mirror-symmetrical manner, and one end portion of the radial line 170A, one end portion of the radial line 170B, and the radial shape are arranged. The other end of the line 170A and the other end of the radial line 170B are electrically connected by a through-hole wiring (not shown) of a through hole 81 formed in the printed circuit board 8. Thereby, one end of the radial line 170A on the front side is electrically connected to the other end of the adjacent radial line 170A via the radial line 170B on the back side, and one end of the radial line 170B on the back side is adjacent to the adjacent radial line 170B. The other end of the radial line 170B is electrically connected via a radial line 170A on the surface side. In this manner, the radial lines 170A and 170B are alternately connected by the through-hole wiring in the through hole 81, whereby the toroidal coil 170 having the winding axis direction as a direction of making a round of the periphery of the opening 80 is formed.

  By the way, the start end of the toroidal coil 170 is electrically connected to the arithmetic processing unit 18, and the end of the return line 172 (shown by a one-dot broken line in FIG. 3) via a through hole wiring (not shown) in the through hole 82. Connected to one end. The return line 172 is formed in the middle layer of the printed circuit board 8 from the end side of the toroidal coil 170 to the start end side through the inside thereof. The other end of the return line 172 is electrically connected to the arithmetic processing unit 18 via a through-hole wiring (not shown) in the through hole 82. In the example shown in FIG. 3, the arithmetic processing unit 18 and the current detection unit 17 are connected by a conductor pattern of the printed circuit board 8.

  As described above, the current detection unit 17 is provided on the printed board 8 and has a plurality of radial shapes arranged radially (separate from the opening 80) on the front surface side and the back surface side of the periphery of the opening 80 through which the conductive member P is inserted. A direction in which the periphery of the opening 80 is circled is wound by the lines 170A and 170B and the through-hole wiring that electrically connects the end of the radial line 170A on the front surface side and the end of the radial line 170B on the back surface side. It consists of a toroidal coil 170 formed in the shape of the direction. Although simplified in FIG. 3, the toroidal coil 170 is actually formed so that the number of turns is about 30 to 40. Further, the toroidal coil 170 shown in FIG. 3 is merely an example, and the current detection unit 17 in the present embodiment is not intended to be limited to the illustrated example, and may be any one that can be configured by the conductor pattern of the printed circuit board 8.

  As shown in FIG. 1A, the arithmetic processing unit 18 includes a current value calculating unit 180, a communication unit 181 for communicating with the inspection device 6 that is an external device, and a control unit (hereinafter, referred to as “control unit”). 182) (referred to as a measurement-side control unit) and a storage unit 183 that includes an EEPROM that is a nonvolatile memory and stores various data. 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 the current value of the branch circuit 4, and an A / D conversion that converts the current value calculated by the effective value calculation unit 180c into digital data 180d, and a memory unit 180e in which the current value converted into digital data by the A / D conversion unit 180d is stored as measurement data.

  When the communication unit 181 receives a trigger signal described later, the communication unit 181 executes processing for outputting the trigger reception signal to the measurement-side control unit 182. In addition, when the communication unit 181 receives inspection date data, which will be described later, from the inspection device 6, the communication unit 181 performs a process of decoding (transmission path decoding) the inspection date data and outputting it to the measurement-side control unit 182. Further, when receiving 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.

  The measurement-side control unit 182 is composed of, for example, a microcomputer that performs various processes when the CPU executes a program stored in a memory. Upon receiving a trigger reception signal, the measurement-side control unit 182 calculates the above-described measurement start signal as a current value calculation. Processing to be output to the 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, when receiving the inspection date data, the measurement-side control unit 182 executes a process of storing the inspection date data in the storage unit 183.

  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. As shown in FIG. 1B, the inspection device 6 includes a container body 6a that is formed in a size that can be carried by a person performing the inspection. The body 6a includes a communication unit 60 for communicating with the branch breaker 1, a storage unit 61 that includes a rewritable storage device such as a flash memory and stores measurement data, and a liquid crystal display (LCD). A display unit 62 composed of an image display, a control unit (hereinafter referred to as an inspection-side control unit) 63 for controlling them, an operation unit 64 for operating the inspection device 6, and a clock unit for obtaining an inspection date 65, and a power supply unit 66 that is a power supply device that supplies power to the inspection device 6 and the arithmetic processing unit 18 of the branch breaker 1 are housed.

  When the communication unit 60 receives a trigger transmission signal, which will be described later, the communication unit 60 performs processing for transmitting the trigger signal. Here, the trigger signal is a high-level (for example, 5 V) and low (for example, 0 V) digital signal (for example, a 1-byte signal of “000001010”). The trigger signal may be an analog signal. However, since a digital signal is generally more resistant to noise than an analog signal, a malfunction due to noise can be prevented by using a digital signal.

  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 indicate the date instead of the date and time.

  Further, the communication unit 60 executes a process of decoding the measurement data received from the branch breaker 1 (transmission path decoding) and outputting the decoded data 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 trigger transmission signal to the communication unit 60 is executed. After outputting the 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 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, if no response is obtained from the branch breaker 1 (measurement data cannot be obtained) even if the count of the timer reaches a predetermined value (that is, even if a predetermined time elapses from the output of the trigger signal), the inspection side The control unit 63 determines that an abnormality has occurred. In this case, the inspection-side control unit 63 executes a process for displaying that an abnormality has occurred on the display unit 62 (a process for displaying abnormality information). Note that the predetermined time, which is a determination criterion for abnormality detection, 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.

  The power supply unit 66 is a power supply that is electrically independent of the power system to which the branch breaker 1 is connected, for example, a primary battery.

  A connecting terminal portion 67 for connecting the branch breaker 1 is provided on the body 6a of the inspection apparatus 6 as described above. 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.

  The 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. Further, 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. That is, the arithmetic processing unit 18 of the branch breaker 1 is not supplied with power from the power system to which the branch breaker 1 is connected, and is electrically independent from the power system to which the branch breaker 1 is connected. Get more power.

  Next, the operation at the time of inspection will be described with reference to FIG. 4 for the branch breaker 1 and FIG. 5 for the inspection device 6.

  In performing an inspection using the inspection device 6, first, 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 trigger signal is received by the communication unit 181 (step S11). When the trigger signal is received, the communication unit 181 outputs a trigger reception signal to the measurement side control unit 182, and the measurement side control unit 182 that has received the trigger reception signal outputs a measurement start signal to the current value calculation unit 180. The current value calculation unit 180 starts calculating the current value (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. The measurement-side control unit 182 receives the examination date data and stores the examination date data and the measurement data in the storage unit 183 in association with each other (step S17), thereby completing a series of operations.

  On the other hand, in the inspection apparatus 6, it is determined whether or not the inspection start button of the operation unit 64 has been operated (step 21). When the inspector operates the inspection start button, the inspection-side control unit 63 outputs a trigger transmission signal to the communication unit 60, and the communication unit 60 that has received the trigger transmission signal transmits the trigger signal (step S22). ). In addition, the inspection-side control unit 63 shifts to a standby state waiting for a response (measurement data) of the branch breaker 1 from when the 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.

  According to the branch breaker 1 described above, the arithmetic processing unit 18 receives power supply from the power supply unit 66 that is electrically independent of the power system to which the primary side terminal unit 10 is connected. Unlike abnormal cases, even if an abnormal voltage occurs in the power system due to lightning surges or various causes, it does not malfunction or break down due to such abnormal voltage. Even if this occurs, accurate current measurement can be performed.

  In addition, since the current detection unit 17 and the arithmetic processing unit 18 are provided on the same printed circuit board 8, the space that can be used by the opening / closing unit 12, the opening / closing mechanism unit 14, the tripping unit 15, etc. is narrow. However, since the current detection unit 17 and the arithmetic processing unit 18 can be efficiently arranged, the size can be reduced. Further, since the current detection unit 17 and the arithmetic processing unit 18 can be connected by the conductor pattern of the printed circuit board 8, when the current detection unit 17 and the arithmetic processing unit 18 are connected using an electric wire (signal line). In comparison, it is possible to prevent problems such as disconnection from occurring during manufacturing. Furthermore, since the current detection unit 17 is an air-core toroidal coil, there is no iron core (magnetic core), so that the size and weight can be reduced, and there is an advantage that there is no saturation due to the iron core. This makes it possible to obtain a current sensor that has a wide dynamic range and can detect a large current.

  By the way, the above-described current value calculation unit 180 obtains a voltage signal indicating a current waveform from the detection output of the current detection unit 17 and calculates the effective value of this current waveform as the current value of the branch circuit 4. It is not uncommon for an error to occur between the actual current value of the branch circuit 4 and the current value.

  Therefore, the current value calculation unit 180 may have a function of correcting the calculation result of the effective value calculation unit 180c to the actual current value of the branch circuit 4 in order to eliminate such an error.

  For example, the current value calculation unit 180 calculates the current value (effective value calculation) of the electric circuit (electric circuit between the primary side terminal unit 10 and the secondary side terminal unit 11) calculated based on the detection output of the current detection unit 17. A correction value storage unit (not shown) in which correction values for correcting the actual values (current values calculated by the unit 180c) to actual values (actual current values of the branch circuit 4) are stored, and a correction value storage unit A current value correction unit (not shown) for correcting the current value (measurement data) calculated by the effective value calculation unit 180c using the correction value may be provided. Of course, the data transmission unit 181 transmits the corrected measurement data to the inspection apparatus 6.

  In this way, even if there is a variation in the characteristics of the current detection unit 17 for each product, it can be prevented that the detection accuracy varies due to such a variation in the current value for each product. The correction value stored in the correction value storage unit may be obtained based on the current value of the branch circuit 4 obtained by the reference current detector and the current value obtained from the branch breaker 1.

  Further, the distribution board SB shown in FIG. 2 is provided in the main breaker 2 and the branch electric circuit 4 that branches from the main electric circuit 3 connected to the secondary side of the main circuit breaker 2 and supplies electric power to the electrical equipment. A plurality of branch breakers 1 are provided. Since the branch breaker 1 has a function of detecting the current flowing through the branch circuit 4, it is easy to identify a location where an overcurrent such as an overload current or a short circuit current or an abnormality such as a leakage occurs in the distribution board SB. Can be identified.

(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 explanatory drawing of a current detection part and a calculation process part. 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 1a body 6 inspection device (external device)
DESCRIPTION OF SYMBOLS 8 Printed circuit board 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 Arithmetic processing part 66 Power supply part (power supply device)
170 Toroidal coils 170A and 170B Radial line 180 Current value calculation unit 181 Communication unit

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 electric circuit between the power supply unit and the secondary terminal unit, a current value calculation unit that calculates a current value of the electric circuit based on a detection output of the current detection unit, and the current value calculation An arithmetic processing unit having a transmission unit that transmits the calculation result of the unit to an external device,
The circuit breaker characterized in that the arithmetic processing unit receives power supply from a power supply device electrically independent of the power system. The current detection unit includes a plurality of radial lines arranged radially on the front and back sides of the periphery of the opening provided on the printed circuit board through which the electric circuit is inserted, and ends of the radial lines on the front side of the printed circuit board And a through-hole wiring that electrically connects the end of the radial line on the back side of the printed circuit board, and a toroidal coil formed in a shape in which the direction around the periphery of the opening is a winding axis direction,
The circuit breaker according to claim 1, wherein the arithmetic processing unit is provided on the printed circuit board.   The current value calculation unit includes a correction value storage unit that stores a correction value for eliminating an error between the current value of the electric circuit calculated based on the detection output of the current detection unit and an actual current value, and A current value correction unit that corrects the current value of the electric circuit using the correction value stored in the correction value storage unit, and outputs the current value of the electric circuit corrected by the current value correction unit as a calculation result; The circuit breaker according to claim 1 or 2.   A distribution breaker comprising a main circuit breaker and a plurality of branch circuit breakers each provided on a branch circuit that branches from a main circuit connected to the secondary side of the main circuit breaker and supplies electric power to an electrical device. Is a circuit breaker according to any one of claims 1 to 3.

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