JP2020068574A - Lightning protection system and monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the configuration of an entire distribution board system including a distribution board and a lightning arrester while enabling acquisition of surge current information. A lightning arrester system 100 includes a lightning arrester 6, a current sensor 7, and a processing unit 8. The lightning arrester 6 is connected between the reference potential point and the feed path A10, and is a surge protection element 61 that conducts and flows a surge current to the reference potential point when a surge voltage is applied to the feed path A10, and a surge protection element. It has a housing 60 for accommodating the housing 60. The current sensor 7 is provided on the outside of the housing 60 and detects a surge current. The processing unit 8 acquires surge current information regarding the surge current by processing the detection result of the current sensor 7. The current sensor 7 is attached to the distribution board 1 and has a function of outputting a detection result of the current flowing through the power supply path A10. [Selection diagram] Fig. 1

Description

  The present disclosure relates to a lightning protection system and a monitoring method, and more particularly, to a lightning protection system including a lightning arrester and a lightning arrester monitoring method.

  Patent Document 1 discloses a conventional lightning arrester management system. This lightning arrester management system is used in a communication system in which a plurality of terminals and a transmission unit are connected via a pair of communication lines.

  The lightning arrester management system includes a lightning arrester and an indicator. The lightning arrester bypasses the surge current to ground when a surge voltage is applied to the communication line. The indicator is connected to the communication line and communicates with the arrester to display the status of the arrester.

  The lightning arrester has circuit protection means (varistor), current detection means (current sensor), surge detection means (CPU), and transmission means (communication driver circuit). The circuit protection means conducts when a surge voltage is applied to the communication line and bypasses the surge current to the ground. The current detection means outputs a surge current value flowing through the circuit protection means. The surge detection means compares the surge current value with a threshold value and detects a surge when the surge current value exceeds the threshold value. The transmitting means transmits the surge occurrence frequency information to the display device via the communication line. The display receives the surge occurrence frequency information and displays the surge occurrence frequency.

JP, 2011-019069, A

  When arranging the lightning arrester on the distribution board, it is desired to simplify the configuration of the entire distribution board system including the distribution board and the lightning arrestor while enabling acquisition of surge current information such as the number of times of surge occurrence. . However, in the lightning arrester management system described in Patent Document 1, the lightning arrester is configured as one unit including circuit protection means (varistor), current detection means (current sensor), surge detection means (CPU), and the like. Therefore, it is difficult to downsize the lightning arrester, and it is difficult to simplify the configuration of the entire distribution board system.

  An object of the present disclosure is to provide a lightning protection system and a monitoring method capable of acquiring surge current information and simplifying the configuration of the entire distribution board system including a distribution board and a lightning arrester. .

  A lightning protection system according to an aspect of the present disclosure includes a lightning arrester, a current sensor, and a processing unit. The lightning arrester has a surge protection element and a housing that houses the surge protection element. The surge protection element is connected between the reference potential point and the power feeding path and conducts when a surge voltage is applied to the power feeding path to flow a surge current to the reference potential point. The current sensor is provided outside the housing and detects the surge current. The processing unit processes the detection result of the current sensor to acquire surge current information regarding the surge current. The current sensor is attached to a distribution board. The current sensor has a function of outputting a detection result of a current flowing through the power feeding path.

  A monitoring method according to one aspect of the present disclosure is a monitoring method using a lightning arrester and a current sensor. The surge arrester is connected between a reference potential point and a power supply line, and is conductive when a surge voltage is applied to the power supply line to allow a surge current to flow to the reference potential point, and the surge protection device. Has a housing for housing. The current sensor is attached to a distribution board outside the housing and has a function of outputting a detection result of a current flowing through the power feeding path. In this monitoring method, when the surge current flows through the surge protection element, the surge current information regarding the surge current is obtained by processing the detection result of the surge current detected by the current sensor. Including.

  INDUSTRIAL APPLICABILITY The lightning protection system and the monitoring method of the present disclosure can simplify the configuration of the entire distribution board system including the distribution board and the lightning arrester while enabling the surge current information to be acquired.

FIG. 1 is an explanatory diagram showing a schematic configuration of a distribution board including a lightning protection system according to an embodiment of the present disclosure. FIG. 2 is an explanatory diagram showing a schematic configuration of the above distribution board. FIG. 3 is a perspective sectional view of a main part of the above distribution board including a conductive bar. FIG. 4 is an explanatory diagram showing a schematic configuration of the above lightning protection system. FIG. 5: is explanatory drawing which shows schematic structure of the lightning protection system which concerns on the modification 1 of one Embodiment of this indication.

(1) Overview In the lightning protection system 100 of the present embodiment, as shown in FIG. 1, an electric load B1 connected to an electric path A1 is referred to as a transient abnormal high voltage (hereinafter referred to as “surge voltage”) such as a lightning surge. ) Is a system to protect from. Here, the electric path A1 includes a power supply path A10 that is provided in the distribution board 1 and supplies electric power to the electric load B1. The electric load B1 is electrically connected to the power feeding path A10, and is supplied with power from the power feeding path A10 to operate. The power feeding path A10 includes an electric path constituted by a conductive bar 9 electrically connected to the main breaker 2. A plurality of branch circuits A11 are branched from the power supply path A10 (conductive bar 9) by a plurality of branch breakers 3. The branch circuit A11 includes an electric path inside the branch breaker 3, and an electric path configured by an electric wire whose one end is connected to the secondary side terminal of the branch breaker 3 and whose other end is connected to the electric load B1.

  The electric load B1 is mainly arranged inside the building and is electrically connected to the power feeding path A10. The electric load B1 is not limited to the inside of the building and may be arranged outside the building. In the present embodiment, the case where the building is a detached house is illustrated, but the present invention is not limited to this example. The building may be, for example, each dwelling unit of an apartment house, an office, a store, a factory, a hospital, or the like as long as the distribution board 1 can be installed.

  The lightning protection system 100 includes a lightning arrester 6, a current sensor 7, and a processing unit 8. The arrester 6, the current sensor 7, and the processing unit 8 are all arranged in the cabinet 10 of the distribution board 1.

  As shown in FIG. 4, the lightning arrester 6 includes a housing 60 and a surge protection element 61. The surge protection element 61 is connected between the reference potential point and the power feeding path A10. In the present embodiment, the reference potential point is the ground, and more specifically, the ground terminal 12 (see FIG. 2) provided in the cabinet 10 of the distribution board 1 and grounded. The housing 60 houses the surge protection element 61 inside.

  The surge protection element 61 is connected to the power supply path A10 of the distribution board 1 in parallel with each of the plurality of branch circuits A11. The surge protection element 61 conducts when a surge voltage is applied to the power supply path A10 and causes a surge current to flow to the reference potential point. When a high voltage is generated between the power supply path A10 and the reference potential point (ground) due to a lightning strike or the like, the surge arrester 6 short-circuits the surge protection element 61 to bypass the surge current, and the surge current flows from the power supply path A10 to an electrical load. Prevent it from flowing to B1.

  As shown in FIG. 1, the current sensor 7 is provided outside the housing 60 of the lightning arrester 6. The current sensor 7 is not housed in the housing 60 of the lightning arrester 6, but is arranged apart from the housing 60. The current sensor 7 detects the current flowing through the power feeding path A10. In particular, the current sensor 7 detects a surge current flowing through the power supply path A10 when a surge voltage is applied to the power supply path A10.

  As shown in FIG. 1, in the present embodiment, the processing unit 8 is provided outside the housing 60 of the lightning arrester 6. The processing unit 8 is not housed in the housing 60 of the lightning arrester 6, but is arranged apart from the housing 60. Here, the processing unit 8 is provided in the measurement adapter 4. The measurement adapter 4 is a device having a measurement function of measuring the electric power passing through the power feeding path A10. The processing unit 8 processes the detection result of the current sensor 7 (the detection result of the surge current detected by the current sensor 7) to acquire the surge current information regarding the surge current. The surge current information includes, for example, information regarding the number of times the surge current has occurred, information regarding the peak value of the surge current, and the like.

  In the lightning protection system 100 of this embodiment, the current sensor 7 is attached to the distribution board 1. The current sensor 7 has a function of outputting the detection result of the current flowing through the power feeding path A10. In the present embodiment, the current sensor 7 has a function of outputting the detection result to the measurement adapter 4. That is, the current sensor 7 is a current sensor (coil 51 described later) of the existing detection unit 5 for detecting the current flowing through the power feeding path A10 and sending the detection result to the measurement adapter 4.

  The lightning protection system 100 of the present embodiment acquires surge current information regarding a surge current passing through the lightning arrester 6 by using the function of the detection unit 5 already provided in the distribution board 1. Therefore, in the lightning protection system 100 of the present embodiment, it is not necessary to newly add a current sensor or prepare a lightning arrester with a built-in current sensor in order to obtain the surge current information. Therefore, the lightning protection system 100 of the present embodiment has an advantage that it is possible to obtain the surge current information and simplify the configuration of the entire distribution board system including the distribution board and the lightning arrester.

(2) Configuration Hereinafter, the lightning protection system 100 of this embodiment will be described with reference to FIGS. 1 to 4. The lightning protection system 100 includes the lightning arrester 6, the current sensor 7, and the processing unit 8 as described above. The lightning protection system 100 is provided on the distribution board 1 including the measurement adapter 4 and the detection unit 5.

(2.1) Distribution Board First, the distribution board 1 provided with the lightning protection system 100 will be described with reference to FIG. In the following description, the top, bottom, left, and right of FIG. 2 are defined as the top, bottom, left, and right of the distribution board 1, and the direction perpendicular to the paper surface of FIG. Stipulate. Specifically, the direction in which the main breaker 2 and the branch breaker 3 are lined up is defined as the left-right direction, and the direction in which the bottom of the cabinet body 11 and the measurement adapter 4 are lined up is defined as the front-back direction. Further, the direction orthogonal to the left-right direction and the front-back direction is defined as the up-down direction.

  As shown in FIG. 2, the distribution board 1 includes a cabinet 10, a main breaker 2, a plurality of branch breakers 3, a measurement adapter 4, a detection unit 5, and a lightning arrester 6.

  The cabinet 10 includes a box-shaped cabinet body 11 having an open front surface, and a lid that closes the opening of the cabinet body 11. In FIG. 2, the illustration of the lid is omitted. Inside the cabinet 10, a main breaker 2, a plurality of branch breakers 3, a measurement adapter 4, a detection unit 5, and a lightning arrester 6 are housed. In the cabinet 10, the measurement adapter 4, the main breaker 2, and the plurality of branch breakers 3 are arranged in this order from the left in the left-right direction.

  The main breaker 2 is arranged inside the cabinet 10 at a position slightly left of the center in the left-right direction. The position of the main breaker 2 in the cabinet 10 may be another position such as the right side of the center. The main breaker 2 includes a primary side terminal 21 and a secondary side terminal. Since the distribution board 1 of the present embodiment assumes a single-phase three-wire system as a power distribution system, the primary-side terminal 21 of the main breaker 2 is a single-phase three-wire service line of a system power supply (commercial power supply). Connected. Further, a plurality of conductive bars 9 (see FIG. 3) are connected to the secondary side terminals of the main breaker 2. Each conductive bar 9 is formed of a conductive member in the shape of an elongated plate that is long in the left-right direction, and is arranged inside the cabinet 10 at the center in the up-down direction and on the right side of the main breaker 2.

  As shown in FIG. 3, the distribution board 1 includes, as the plurality of conductive bars 9, a conductive bar 91 of a first voltage pole (L1 phase), a conductive bar 92 of a second voltage pole (L2 phase), and a neutral pole. The (N-phase) conductive bar 93 is provided. Then, to the three secondary side terminals of the main breaker 2, the conductive bar 91 of the first voltage pole (L1 phase), the conductive bar 92 of the second voltage pole (L2 phase), and the conductive of the neutral pole (N phase). Bars 93 are connected to each other. The plurality of conductive bars 9 are held by a synthetic resin base 94.

  The conductive bar 91 of the first voltage pole includes a flat plate 911 that is long in the left-right direction and has a thickness in the front-rear direction, and a standing piece 912 that protrudes forward from the lower edge of the flat plate 911. . The tip portion of the standing piece 912 is bifurcated, and one of the standing pieces 912 serves as a connecting terminal 913 projecting downward and the other serves as a connecting terminal 913 projecting upward. In FIG. 3, the connection terminal 913 protruding upward is hidden by the substrate 50 (described later) of the detection unit 5 and is not visible.

  The conductive bar 92 of the second voltage pole includes a flat plate 921 that is long in the left-right direction and has a thickness in the front-rear direction, and a standing piece 922 that projects forward from the upper edge of the flat plate 921. . The leading end of the standing piece 922 is bifurcated, one of which serves as a connecting terminal 923 which projects downward and the other of which serves as a connecting terminal 923 which projects upward. In FIG. 3, the connection terminal 923 protruding upward is hidden by the substrate 50 of the detection unit 5 and is not visible.

  The neutral pole conductive bar 93 is formed in a flat plate shape that is long in the left-right direction and has a thickness in the front-rear direction.

  The plurality of branch breakers 3 are divided into an upper side and a lower side of the neutral pole conductive bar 93, and a plurality of branch breakers 3 are arranged side by side in the left-right direction (see FIG. 2). In the present embodiment, twelve branch breakers 3 are arranged on the upper side of the neutral pole conductive bar 93 so as to be aligned in the left-right direction. Further, eleven branch breakers 3 are arranged below the neutral pole conductive bar 93 so as to be aligned in the left-right direction. A lightning arrester 6 is arranged on the right side of the eleven branch breakers 3 below the neutral pole conductive bar 93.

  Each branch breaker 3 includes a pair of primary side terminals and a pair of secondary side terminals. The branch breaker 3 is available for 100V and 200V. The pair of primary side terminals included in the branch breaker 3 for 100 V are electrically connected to one of the conductive bar 91 of the first voltage pole and the conductive bar 92 of the second voltage pole, and the conductive bar 93 of the neutral pole. Connected. Specifically, the pair of primary-side terminals included in the branch breaker 3 for 100 V is one of the connection terminal 913 of the conductive bar 91 of the first voltage pole and the connection terminal 923 of the conductive bar 92 of the second voltage pole, and the middle. It is electrically connected to the conductive bar 93 of the sex pole. The pair of primary side terminals of the branch breaker 3 for 200V are electrically connected to the conductive bar 91 of the first voltage pole and the conductive bar 92 of the second voltage pole, respectively. Specifically, the pair of primary-side terminals included in the branch breaker 3 for 200 V are electrically connected to the connection terminal 913 of the conductive bar 91 of the first voltage pole and the connection terminal 923 of the conductive bar 92 of the second voltage pole, respectively. Connected to.

  By connecting the branch breaker 3 to the conductive bar 9, a branch circuit A11 including an electric path in the branch breaker 3 is formed on the downstream side of the conductive bar 9. An electric wire is electrically connected to the secondary side terminal of the branch breaker 3. An electric load B1 is connected to the electric wire connected to the secondary side terminal of each branch breaker 3 directly or via a connector such as an outlet. The electric load B1 is, for example, a lighting device, an air conditioner, a television receiver, an electric device such as hot water supply equipment, a wall switch, or the like. The electric load B1 is connected to the ground terminal 12 and thus connected to the reference potential point (grounded).

  The detection unit 5 detects a current flowing through the electric load B1 (branch circuit A11) connected to each of the plurality of branch breakers 3. In other words, the detection unit 5 detects the current flowing through each branch circuit A11. The detection unit 5 individually detects the current flowing through the plurality of branch circuits A11. As shown in FIG. 3, the detection unit 5 includes a substrate 50 and a plurality of coils 51 (current sensors) provided on the substrate 50. The substrate 50 has a plate shape that is long in the left-right direction. A plurality of holes 52 are formed in the substrate 50. The connection terminal 913 of the conductive bar 91 of the first voltage pole or the connection terminal 923 of the conductive bar 92 of the second voltage pole is inserted into each hole 52. The coil 51 is a Rogowski coil here, and is formed around the hole 52 of the substrate 50. As shown in FIG. 3, in the substrate 50 of the lower detection unit 5, among the plurality of holes 52, the hole 52 (relatively rear side) into which the connection terminal 923 of the conductive bar 92 of the second voltage electrode is inserted. Is formed around the hole 52). Of course, the coil 51 may be formed around the hole 52 (relatively front hole 52) into which the connection terminal 913 of the conductive bar 91 of the first voltage electrode is inserted. In this embodiment, the detection unit 5 detects the current flowing in each branch circuit A11 by measuring the current induced in each of the plurality of coils 51. Although illustration is omitted, in the substrate 50 of the upper detection unit 5, among the plurality of holes 52, the hole 52 into which the connection terminal 913 of the conductive bar 91 of the first voltage electrode is inserted (relatively rear side). The coil 51 is formed around the hole 52).

(2.2) Measurement Adapter The measurement adapter 4 is arranged inside the cabinet 10 on the left side of the main breaker 2. The measuring adapter 4 has a measuring function of measuring the electric power passing through at least one of the main breaker 2 and the branch breaker 3 in the distribution board 1, and a communication function of communicating with a device arranged outside the cabinet 10. There is. The measurement function and the communication function of the measurement adapter 4 are realized by the control unit in the measurement adapter 4. The control unit has a computer system having a processor and a memory. Then, the computer system functions as a control unit by the processor executing an appropriate program. The program may be recorded in advance in a memory, may be provided through an electric communication line such as the Internet, or may be recorded in a non-transitory recording medium such as a memory card and provided.

  More specifically, the measurement adapter 4 of the present embodiment is electrically connected to the main detection unit that measures the current flowing through the main breaker 2 and the detection unit 5 described above. Here, the master detection unit includes a current sensor including, for example, a current transformer (CT). The CT of the master detection unit detects a current flowing through a lead wire connected to the primary side terminal 21 of the master breaker 2. Then, the measurement adapter 4 has a function (measurement function) of converting each of the current values measured by the detection unit 5 and the main detection unit into a power value.

  Further, the measurement adapter 4 has a function (communication function) of communicating with a controller configured to control a device corresponding to a HEMS (Home Energy Management System) (hereinafter referred to as a HEMS compatible device). ing. The controller is a device arranged outside the cabinet 10. Here, the HEMS compatible device only needs to be a power consumption management target, for example, a smart meter, a solar power generation device, a power storage device, a fuel cell, an electric vehicle, an air conditioner, a lighting fixture, a hot water supply device, a refrigerator, or a television receiver. Including etc. The HEMS compatible device is not limited to these devices.

  The communication method between the measurement adapter 4 and the controller conforms to a communication standard such as a 920 MHz band low power wireless station (a wireless station that does not require a license), Wi-Fi (registered trademark), or Bluetooth (registered trademark). Alternatively, wireless communication using radio waves may be used. In addition, the communication method between the measurement adapter 4 and the controller may be wired communication conforming to a communication standard such as a wired LAN (Local Area Network).

  Further, as the communication protocol in the communication between the measurement adapter 4 and the controller, for example, Ethernet (registered trademark), ECHONET Lite (registered trademark) or the like may be used.

  In the distribution board 1 of the present embodiment, the measurement adapter 4 receives from the detection unit 5 the current value of each of the plurality of branch circuits A11 measured by the detection unit 5. Furthermore, the measurement adapter 4 receives the current value measured by the master detection unit from the master detection unit. The measurement adapter 4 converts each of the current values measured by the detection unit 5 and the master detection unit into a power value (instantaneous power value). The measurement adapter 4 has a function of calculating power amount data obtained by integrating the collected instantaneous power data over a predetermined time. Therefore, the controller that communicates with the measurement adapter 4 can control the HEMS-compatible device based on the instantaneous power and the power amount at each of the plurality of loads connected to the plurality of branch circuits A11.

  Further, the measurement adapter 4 has a function (communication function) of communicating with at least one of the solar power generation device, the power storage device, and the power conversion device electrically connected to the electric vehicle. In addition to the power conversion for unidirectional charging from the distribution board 1 to the electric vehicle, the power conversion device is used for both charging and discharging of the storage battery of the electric vehicle by bidirectionally performing power conversion. It may be configured to be.

  The measurement adapter 4 also has a communication function with at least one of a gas meter and a water meter. The communication method between the measurement adapter 4 and the solar power generation device, the power storage device, and the power conversion device is wired communication that conforms to a communication standard such as RS-485. The measurement adapter 4 may be capable of communicating with, for example, a hot water storage type hot water supply device (EcoCute (registered trademark)) or the like. However, the communication method between the measurement adapter 4 and the gas meter or the water meter is not limited to wired communication, and may be wireless communication.

(2.3) Lightning Arrester As shown in FIG. 1, the lightning arrester 6 is arranged in the cabinet 10 of the distribution board 1. The lightning arrester 6 is connected to the power feeding path A10.

  As shown in FIG. 4, the lightning arrester 6 includes a housing 60, a pair of surge protection elements 61, a fuse 62, a pair of primary side terminals 63, and a ground connection terminal 64.

  As shown in FIG. 2, the housing 60 of the lightning arrester 6 has the same size and shape as the housing of the branch breaker 3. The lightning arrester 6 is arranged, for example, in the space where the branch breaker 3 is arranged in the cabinet 10 of the distribution board 1 instead of one branch breaker 3. In the example of FIG. 2, a lightning arrester 6 is arranged instead of the branch breaker 3 arranged on the lower right side of the conductive bar 9.

  The lightning arrester 6 is connected to the conductive bar 9 in the same manner as the branch breaker 3. That is, the pair of primary-side terminals 63 of the lightning arrester 6 are electrically connected to the conductive bar 91 of the first voltage pole (L1 phase) and the conductive bar 92 of the second voltage pole (L2 phase) of the distribution board 1, respectively. To be done. Here, as described above, in the substrate 50 of the lower detection unit 5, the connection terminal 923 of the conductive bar 92 of the second voltage pole is inserted into the hole 52 of the substrate 50 around which the coil 51 is formed. There is. Therefore, the coil 51 is arranged around the electric path (connection terminal 923) between the conductive bar 92 of the second voltage pole and the primary side terminal 63.

  Each of the pair of surge protection elements 61 has a first end electrically connected to a corresponding one primary side terminal 63 of the pair of primary side terminals 63, and a second end electrically connected to each other. There is. Further, the second ends of the pair of surge protection elements 61 are electrically connected to the ground connection terminal 64 via the fuse 62. The ground connection terminal 64 is connected to the reference potential point (grounded) by being connected to the ground terminal 12 (see FIG. 2) provided in the cabinet body 11 of the distribution board 1, for example. .

  The surge protection element 61 here comprises a varistor. The varistor has, for example, a structure in which semiconductor ceramics having nonlinear resistance characteristics (ceramics obtained by adding several kinds of additives to zinc oxide) are sandwiched between a pair of electrodes. The pair of electrodes of each varistor are connected to the primary side terminal 63 and the ground connection terminal 64, respectively. When a large voltage such as a surge voltage is applied between the pair of electrodes, the varistor suddenly lowers its electrical resistance and bypasses the current. The surge protection element 61 is not limited to the varistor. The surge protection element 61 may include, for example, a gas discharge tube (Gas Discharge Tube: GDT) or an avalanche diode instead of the varistor, may further include a resistor or a capacitor, or may include a varistor and a gas discharge tube. May be provided with a series circuit of the above. The surge protection element 61 such as a varistor may be deteriorated by heat generation due to the surge current each time the surge protection element 61 is made conductive and the surge current flows. Therefore, it is desirable that the surge protection element 61 be maintained (replaced, repaired, etc.) at an appropriate timing.

  The fuse 62 is electrically connected between the surge protection element 61 and the ground connection terminal 64. The fuse 62 is blown when an overcurrent of a rated value or more continues to flow, and insulates between the power feeding path A10 (conductive bar 9) and the reference potential point (ground). For example, when the varistor as the surge protection element 61 deteriorates, a pair of electrodes of the varistor are short-circuited, and the current continues to flow from the power feeding path A10 to the reference potential point. The fuse 62 generates heat due to this current and is blown to insulate the power supply path A10 from the reference potential point.

  As shown in FIG. 1, the current sensor 7 is provided outside the housing 60 of the lightning arrester 6. The current sensor 7 detects a surge current flowing through the power feeding path A10.

  Here, the current sensor 7 is the current sensor (coil 51) of the detection unit 5 having a function of sending the detection result to the measurement adapter 4. That is, the current sensor 7 in this embodiment includes the coil 51 which is a Rogowski coil. The Rogowski coil is a coil in which a conductor wire is wound around an annular core material, and detects the time change (differential value of the current) of the current flowing through the conductor wire (feed path A10) to be measured, and is proportional to its magnitude. Output the voltage signal. In the Rogowski coil, since the core material is formed of a non-magnetic material, magnetic saturation is less likely to occur as compared with a current transformer having a magnetic material as a core. Therefore, the Rogowski coil is also suitable for measuring large voltages such as lightning surges. In the present embodiment, the current sensor 7 is the coil 51 arranged around the connection terminal 923 of the conductive bar 9 to which the lightning arrester 6 is connected.

  As shown in FIG. 1, the processing unit 8 is provided outside the housing 60 of the lightning arrester 6. Here, the processing unit 8 is provided in the measurement adapter 4. The processing unit 8 acquires the surge current information regarding the surge current by processing the detection result of the current sensor 7. The processing unit 8 has a computer system having a processor and a memory. The computer system functions as the processing unit 8 by the processor executing an appropriate program. The program may be recorded in advance in a memory, may be provided through an electric communication line such as the Internet, or may be recorded in a non-transitory recording medium such as a memory card and provided. The computer system of the processing unit 8 may be the same as or different from the computer system of the control unit of the measurement adapter 4.

  The processing unit 8 acquires the detection result from the current sensor 7. The processing unit 8 processes the detection result of the current sensor 7. The processing unit 8 acquires the surge current information regarding the surge current by processing the detection result of the current sensor 7.

  The surge current information acquired by the processing unit 8 includes, for example, surge frequency information. The information on the number of surges is information on the number of times a surge current is generated in the power supply path A10. The processing unit 8 counts the number of times that a current having a magnitude equal to or larger than a threshold value flows through the lightning arrester 6 based on the voltage signal from the current sensor 7, for example. For example, when the current value measured by the current sensor 7 changes from a value equal to or less than the threshold value to a value greater than the threshold value and then becomes a value less than or equal to the threshold value, the processing unit 8 causes a surge current to flow once in the arrester 6. (Surge current has occurred once).

  The processing unit 8 determines the degree of deterioration of the surge protection element 61 of the lightning arrester 6 based on the number of times the surge current is generated.

  Here, the path of the surge current flowing through the arrester 6 due to a lightning strike or the like includes the following first and second paths. The first path is a path from a pole transformer (distribution transformer) or the like to the reference potential point through the service wire, the main breaker 2, the conductive bar 9, and the surge protection element 61. The second route is a route from the ground to the lightning arrester 6 through the ground terminal 12 (reference potential point).

  Of the first and second paths, at least the surge current passing through the first path can be detected by the current sensor 7. Therefore, the processing unit 8 can estimate the number of times of the surge current flowing through the surge protection element 61 by counting the number of times of occurrence of the surge current. As a result, the processing unit 8 can determine the degree of deterioration of the surge protection element 61.

  The surge current information acquired by the processing unit 8 includes, for example, surge intensity information. The surge intensity information is information on the intensity of the surge current, and is, for example, information on the peak value of the surge current. The processing unit 8 acquires information on the peak value (amplitude) of the surge current each time a surge current flows through the current sensor 7, based on the voltage signal from the current sensor 7, for example. The degree of deterioration of the surge protection element 61 due to the surge current flowing once depends on the energy passing through the surge protection element 61 due to the surge current. Therefore, the processing unit 8 can estimate the energy passing through the surge protection element 61 by acquiring the information on the peak value of the surge current. As a result, the processing unit 8 can determine the degree of deterioration of the surge protection element 61.

The surge current information acquired by the processing unit 8 includes, for example, surge energy information. The surge energy information is information about energy of surge current. The processing unit 8 acquires information on the energy of the surge current each time a surge current flows through the current sensor 7, based on the voltage signal from the current sensor 7, for example. The energy of the surge current is obtained by, for example, time integration of (amplitude of surge current) ² × (resistance value). The degree of deterioration of the surge protection element 61 due to the surge current flowing once depends on the energy passing through the surge protection element 61 due to the surge current. Therefore, the processing unit 8 can estimate the energy passing through the surge protection element 61 by acquiring the surge energy information. As a result, the processing unit 8 can determine the degree of deterioration of the surge protection element 61.

  As shown in FIG. 1, the lightning protection system 100 further includes an output unit 80. The output unit 80 outputs state information regarding the state of the surge protection element 61 based on the result of the surge current information obtained by the processing unit 8.

  The output unit 80 includes, for example, a communication interface for wireless communication. The output unit 80 is provided in the measurement adapter 4, for example. In this case, the output unit 80 may be realized by the communication function of the measurement adapter 4. The processing unit 8 outputs, for example, surge current information as state information via the output unit 80. The processing unit 8 may output the state information obtained by processing the surge current information via the output unit 80. The state information obtained by processing the surge current information is, for example, information indicating the degree of deterioration of the surge protection element 61.

  The output unit 80 is not limited to the configuration including the communication interface for wireless communication. The output unit 80 may be a notification unit that emits at least one of light and sound. For example, the notification unit turns off when the degree of deterioration of the surge protection element 61 is small (for example, when the number of times of occurrence of surge current is less than or equal to a predetermined threshold), and when the degree of deterioration becomes large (the number of times of occurrence of the above-mentioned occurrence of There may be provided an LED that lights up (above). In this case, whether the LED is turned on or off corresponds to the status information.

  As described above, in the lightning protection system 100 of the present embodiment, the processing unit 8 uses the function of the detection unit 5 already provided in the distribution board 1 to obtain the surge current information regarding the surge current passing through the lightning arrester 6. get. Therefore, the lightning arrester system 100 of the present embodiment does not need to newly add a current sensor or the like or prepare a lightning arrester with a built-in current sensor in order to acquire the surge current information, and thus the lightning arrester 6 is small in size. Easy to achieve. Therefore, the lightning protection system 100 of the present embodiment has an advantage that it is possible to obtain the surge current information and simplify the configuration of the entire distribution board system including the distribution board and the lightning arrester.

  Further, in the lightning protection system 100 of the present embodiment, the current sensor 7 and the processing unit 8 are not housed in the housing 60 of the lightning arrester 6. Therefore, when the surge protection element 61 deteriorates, only the arrester 6 needs to be replaced.

  The function of the processing unit 8 may be realized by the control unit of the existing measurement adapter 4.

(4) Modified Example The above-described embodiment is only one of the various embodiments of the present disclosure. The above-described embodiment can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved. The same function as the processing unit 8 of the lightning protection system 100 may be embodied by a method of monitoring the lightning arrester 6, a (computer) program, a non-transitory recording medium recording the program, or the like.

  The monitoring method of the lightning arrester 6 according to one aspect is a monitoring method using the lightning arrester 6 and the current sensor 7. The surge arrester 6 is connected between the reference potential point and the power feeding path A10 of the distribution board 1, and is conductive when a surge voltage is applied to the power feeding path A10 to flow a surge current to the reference potential point 61. , And a surge protection element 61 are housed in the housing 60. The current sensor 7 is attached to the distribution board 1 outside the housing 60 and has a function of outputting the detection result of the current flowing through the power feeding path A10. This monitoring method includes acquiring surge current information regarding the surge current by processing the detection result of the surge current detected by the current sensor 7 when the surge current flows through the surge protection element 61.

(4.1) Modification 1
The lightning arrester system 100A of the present modified example includes a lightning arrester 6A shown in FIG. The lightning protection system 100A further includes a ground wire current sensor 71 that detects a current flowing through a conductor (ground wire) connected between the surge protection element 61 and a reference potential point (ground).

  In the lightning arrester 6A, as shown in FIG. 5, fuses 62A are connected between the pair of primary side terminals 63 and the pair of surge protection elements 61, respectively. Further, the pair of surge protection elements 61 are grounded by being connected to the ground terminal 12 (see FIG. 2) of the distribution board 1. A ground wire current sensor 71 is provided on the conductor (ground wire) that connects the surge protection element 61 and the reference potential point. The ground wire current sensor 71 is a Rogowski coil here, but may be a CT (current transformer) or a GMR (giant magnetoresistive effect) sensor.

  The lightning protection system 100A of the present modification includes a ground wire current sensor 71. Therefore, it becomes possible to detect the surge current passing through the second path, and the reliability of the surge current information is improved.

(4.2) Modification 2
The lightning protection system 100 of this modification has the same configuration as the lightning protection system 100 of the above-described embodiment. Then, in the present modification, the processing unit 8 also obtains the current detection result from the coil 51 arranged around the connection terminals 913 and 923 of the conductive bar 9 to which the branch breaker 3 is connected.

  That is, in the present modification, the processing unit 8 individually obtains the detection result from the plurality of coils 51 (current sensor 7) that respectively measure the currents flowing through the plurality of branch circuits A11. Then, the processing unit 8 processes the detection result of each of the plurality of current sensors 7. That is, the processing unit 8 acquires the surge current information regarding the surge current by individually processing the voltage signals from the plurality of current sensors 7.

  The processing unit 8 counts, for example, the total number (total value) of the surge currents generated in the plurality of coils 51 (current sensor 7). For example, the processing unit 8 determines the degree of deterioration of the surge protection element 61 of the lightning arrester 6 by taking the counted total value into consideration.

  Further, the processing unit 8 individually counts the number of times of occurrence of surge current (individual value) for each of the plurality of coils 51. By comparing the individual values of the plurality of coils 51, it becomes possible to specify the branch circuit A11 in which surge current easily flows (lightning surge is likely to occur), which may lead to a review of the circuit design or the like.

  For example, the ground of the electric load B1 that is not grounded (not connected to the ground terminal 12) has a potential difference with respect to the ground (ground terminal 12). Therefore, when lightning occurs, the induced lightning may enter the electric load B1 via the ground. Therefore, the electrical load B1 that is not grounded is more likely to generate a lightning surge than the electrical load B1 that is grounded. In this modification, it is possible to detect and notify the presence of the non-grounded electrical load B1 by individually counting the number of times of occurrence of surge current.

  In addition, a lightning surge that enters the electric load B1 from an antenna installed outdoors needs to be separately addressed by connecting a lightning arrester for the antenna between the antenna and the electric load B1. If such an arrester for an antenna is not connected, a surge current may flow from the antenna through the electric load B1 and the conductive bar 9. That is, in the branch circuit A11 including the electrical load B1 to which the surge arrester for the antenna is not connected, the number of times the surge current is generated is likely to increase. In this modification, it is possible to detect and notify the presence of the electrical load B1 to which the surge arrester for the antenna is not connected by individually counting the number of times the surge current is generated.

(4.3) Other Modifications Other modifications of the above-described embodiment will be listed below. The modifications described below can be applied in appropriate combination.

  The lightning protection system 100 (100A) in the present disclosure includes a computer system in the processing unit 8 and the like, for example. The computer system mainly includes a processor as a hardware and a memory. The function as the processing unit 8 in the present disclosure is realized by the processor executing the program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, may be provided through an electric communication line, or may be recorded in a non-transitory recording medium such as a memory card, an optical disk, a hard disk drive, which can be read by the computer system. May be provided. The processor of the computer system is composed of one or a plurality of electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). The integrated circuit such as IC or LSI referred to here is called differently depending on the degree of integration, and includes an integrated circuit called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Further, an FPGA (Field-Programmable Gate Array), which is programmed after the LSI is manufactured, or a logic device capable of reconfiguring the connection relation inside the LSI or reconfiguring the circuit section inside the LSI, should also be adopted as a processor. You can The plurality of electronic circuits may be integrated in one chip, or may be distributed and provided in the plurality of chips. The plurality of chips may be integrated in one device or may be distributed and provided in the plurality of devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or a plurality of electronic circuits including a semiconductor integrated circuit or a large scale integrated circuit.

  Further, for example, it is not essential for the lightning protection system 100 that the plurality of functions of the processing unit 8 are integrated in one housing. That is, the constituent elements of the processing unit 8 may be distributed and provided in a plurality of housings. Further, for example, at least a part of the function of the processing unit 8 may be realized by, for example, a server device and a cloud (cloud computing).

  The function of the processing unit 8 may be realized by the computer system that constitutes the control unit of the measurement adapter 4 executing an appropriate program. The function of the processing unit 8 may be realized by executing an appropriate program on a computer system other than the measurement adapter 4. As an example, when the lightning arrester 6 has a computer system, the function of the processing unit 8 may be realized by executing an appropriate program in this computer system.

  The current sensor 7 is not limited to the Rogowski coil, and may be a CT or GMR sensor as long as it can output a current detection result. The output destination of the detection result of the current sensor 7 is not limited to the measurement adapter 4 and may be any device having a computer system that realizes the function of the processing unit 8.

  The lightning arrester 6 (6A) may be provided with an informing means for informing that the fuse 62 (62A) has blown, for example, an LED that lights up when the fuse 62 (62A) has blown.

  The current sensor 7 may include a current sensor of a master detection unit that measures a current flowing through the master breaker 2. That is, the processing unit 8 may acquire and process the detection result from the master detection unit. The processing unit 8 may acquire and process the detection result from the current sensor of the detection unit 5 and / or the current sensor of the master detection unit.

(Summary)
The following aspects are disclosed from the embodiment and the modified examples described above.

  The lightning protection system (100, 100A) of the first aspect includes a lightning arrester (6, 6A), a current sensor (7), and a processing unit (8). The lightning arrester (6, 6A) has a surge protection element (61) and a housing (60). The surge protection element (61) is connected between the reference potential point and the power feeding path (A10). The surge protection element (61) conducts when a surge voltage is applied to the power supply path (A10), and causes a surge current to flow to the reference potential point. The housing (60) houses the surge protection element (61). The current sensor (7) is provided outside the housing (60). The current sensor (7) detects a surge current. The processing unit (8) acquires the surge current information regarding the surge current by processing the detection result of the current sensor (7). The current sensor (7) is attached to the distribution board (1). The current sensor (7) has a function of outputting the detection result of the current flowing through the power feeding path (A10).

  According to this aspect, it is not necessary to newly add a current sensor (7) or the like or to prepare a lightning arrester with a built-in current sensor in order to acquire the surge current information. Therefore, it becomes possible to simplify the configuration of the entire distribution board system including the distribution board (1) and the lightning arrester (6) while making it possible to acquire the surge current information.

  In the lightning protection system (100, 100A) of the second aspect, in the first aspect, the current sensor (7) includes a Rogowski coil.

  According to this aspect, it is possible to measure the peak value even for a surge current having a large current value.

  In the lightning protection system (100, 100A) of the third aspect, in the first or second aspect, the surge current information includes information regarding the number of times the surge current is generated.

  According to this aspect, it is possible to determine the degree of deterioration of the surge protection element (61).

  In the lightning protection system (100, 100A) of the fourth aspect, in any one of the first to third aspects, the surge current information includes information regarding the peak value of the surge current.

  According to this aspect, it is possible to determine the degree of deterioration of the surge protection element (61).

  The lightning protection system (100, 100A) of the fifth aspect includes a plurality of current sensors (7) according to any one of the first to fourth aspects. The processing unit (8) acquires surge current information by processing the detection results of each of the plurality of current sensors (7).

  According to this aspect, the processing unit (8) can acquire the surge current based on the detection results of the plurality of current sensors (7), and the reliability of the surge current information is improved.

  The lightning protection system (100A) according to the sixth aspect is the ground according to any one of the first to fifth aspects, which detects a current flowing through a conductor connected between the surge protection element (61) and a reference potential point. A line current sensor (71) is further provided.

  According to this aspect, the reliability of the surge current information is improved.

  The lightning protection system (100, 100A) of the seventh aspect is any one of the first to sixth aspects, further including an output unit (80). The output unit (80) outputs state information regarding the state of the surge protection element (61) based on the result of the surge current information acquired by the processing unit (8).

  According to this aspect, the external device or the user can use the state information.

  In the lightning protection system (100, 100A) of the eighth aspect, in any one of the first to seventh aspects, the processing unit (8) is provided in the measurement adapter (4).

  According to this aspect, it is possible to simplify the overall configuration of the distribution board system including the distribution board (1) provided with the measurement adapter (4) and the lightning arrester (6).

  The monitoring method of the ninth aspect is a monitoring method using a lightning arrester (6) and a current sensor (7). The lightning arrester (6) is connected between the reference potential point and the power supply path (A10), and is conductive when a surge voltage is applied to the power supply path (A10) and causes a surge current to flow to the reference potential point. (61) and a case (60) for accommodating the surge protection element (61). The current sensor (7) is attached to the distribution board (1) outside the housing (60) and has a function of outputting a detection result of a current flowing through the power feeding path (A10). In this monitoring method, when a surge current flows through the surge protection element (61), the result of detection of the surge current detected by the current sensor (7) is processed to obtain surge current information regarding the surge current.

  According to this aspect, it is possible to simplify the configuration of the entire distribution board system including the distribution board (1) and the lightning arrester (6) while obtaining the surge current information.

  The configurations according to the second to eighth aspects are not essential for the lightning protection system (100) and can be omitted as appropriate.

1 Distribution board 4 Measurement adapter 6,6A Lightning arrester 60 Housing 61 Surge protection element 7 Current sensor 71 Earth wire current sensor 8 Processing unit 80 Output unit 100,100A Lightning protection system A10 Power supply line

Claims (9)

A surge protection element that is connected between a reference potential point and a power supply path and that conducts when a surge voltage is applied to the power supply path and allows a surge current to flow to the reference potential point, and a casing that houses the surge protection element. A lightning arrester having a body,
A current sensor that is provided outside the housing and detects the surge current,
By processing the detection result of the current sensor, a processing unit that acquires surge current information regarding the surge current,
Equipped with
The current sensor is attached to a distribution board and has a function of outputting a detection result of a current flowing through the power feeding path,
Lightning protection system. The current sensor comprises a Rogowski coil,
The lightning protection system according to claim 1. The surge current information includes information about the number of times the surge current has occurred,
The lightning protection system according to claim 1. The surge current information includes information about the peak value of the surge current,
The lightning protection system according to any one of claims 1 to 3. A plurality of the current sensors,
The processing unit acquires the surge current information by processing a detection result of each of the plurality of current sensors,
The lightning protection system according to any one of claims 1 to 4. A ground wire current sensor for detecting a current flowing through a conductor connected between the surge protection element and the reference potential point;
The lightning protection system according to any one of claims 1 to 5. Further comprising an output unit that outputs state information regarding the state of the surge protection element, based on an acquisition result of the surge current information of the processing unit.
The lightning protection system according to any one of claims 1 to 6. The processing unit is provided in the measurement adapter,
The lightning protection system according to any one of claims 1 to 7. A surge protection element that is connected between a reference potential point and a power supply path and that conducts when a surge voltage is applied to the power supply path and allows a surge current to flow to the reference potential point, and a casing that houses the surge protection element. A lightning arrester having a body,
A monitoring method using a current sensor, which is attached to a distribution board outside the housing and has a function of outputting a detection result of a current flowing through the power feeding path,
When the surge current flows through the surge protection element, the surge current information regarding the surge current is obtained by processing the detection result of the surge current detected by the current sensor,
Monitoring method.

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