WO2022176170A1 - Système de protection contre la foudre, appareil de commande, procédé de protection contre la foudre et programme - Google Patents

Système de protection contre la foudre, appareil de commande, procédé de protection contre la foudre et programme Download PDF

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Publication number
WO2022176170A1
WO2022176170A1 PCT/JP2021/006446 JP2021006446W WO2022176170A1 WO 2022176170 A1 WO2022176170 A1 WO 2022176170A1 JP 2021006446 W JP2021006446 W JP 2021006446W WO 2022176170 A1 WO2022176170 A1 WO 2022176170A1
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WO
WIPO (PCT)
Prior art keywords
lightning protection
ground
impedance
detector
protection system
Prior art date
Application number
PCT/JP2021/006446
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English (en)
Japanese (ja)
Inventor
尚倫 中村
直樹 花岡
裕二 樋口
徹 田中
Original Assignee
日本電信電話株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to PCT/JP2021/006446 priority Critical patent/WO2022176170A1/fr
Publication of WO2022176170A1 publication Critical patent/WO2022176170A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions

Definitions

  • the present invention relates to a lightning protection system, a control device, a lightning protection method and a program.
  • Non-Patent Document 1 discloses a connection method in which a lightning arrester (SPD: Surge Protective Device) is connected in parallel with a device to be protected, and the grounding of the lightning arrester and the device to be protected is commonly connected.
  • SPD Surge Protective Device
  • ITU-T K.66 "Protection of customer premises from overvoltages,” Nov. 2019.
  • the disclosed technology aims to display the presence or absence of a failure inside the protected device or the connection state of the ground wire.
  • the disclosed technology is a lightning protection system comprising a lightning arrester, a detector, and a control device, wherein the detector injects an inspection signal into a ground line connecting a device to be protected and the lightning arrester, Upon receiving the test signal, the control device determines whether or not the detector can receive the test signal via the protected device, the waveform of the received test signal, or the impedance characteristic calculated from the received test signal.
  • a lightning protection system comprising: a judgment unit for judging whether there is an internal failure in the protected device, the connection state of the grounding wire, or the adequacy of the grounding wire; and a display unit for displaying the judgment result of the judgment unit. .
  • FIG. 10 is a diagram showing an image of failure of an internal circuit by a conventional lightning protection method
  • 1 is a system configuration diagram of a lightning protection system according to Embodiment 1
  • FIG. 2 is a functional configuration diagram of a control device according to Embodiment 1
  • FIG. 6 is a flow chart showing an example of the flow of control processing according to the first embodiment
  • FIG. 10 is a system configuration diagram of a lightning protection system according to a second embodiment
  • FIG. 8 is a functional configuration diagram of a control device according to Embodiment 2
  • FIG. 11 is a flow chart showing an example of the flow of control processing according to the second embodiment
  • FIG. 11 is a functional configuration diagram of a control device according to Example 3;
  • FIG. 11 is a flow chart showing an example of the flow of control processing according to the third embodiment;
  • FIG. 11 is a diagram for explaining a method of calculating a difference in impedance characteristics according to Example 3; It is a hardware block diagram of a control apparatus.
  • FIG. 1 is a diagram showing an outline of a conventional lightning protection method.
  • a conventional lightning surge countermeasure system for a DC power supply device 20 includes a first lightning arrester 11 installed between two power cables 30 on the output side of the DC power supply device 20, and a first lightning arrester 11 installed between the ground of each power cable. and two second lightning arresters 12.
  • the two second lightning arresters 12 have one end connected to one of the power cables via the ground wire 40, and the other end connected to each other on the ground side via the ground wire 41 and to the ground electrode 50.
  • the housing of the DC power supply device 20 is made of metal, has a ground terminal, and is connected (connected) to the ground side of the second lightning arrester 12 via a ground wire 42 connected to the ground terminal. If the housing is directly connected to the ground electrode 50 , the effect of countermeasures will be reduced, so the housing has a ground terminal and is not directly connected to the ground electrode 50 .
  • the insulation bushing 23 or the like is used to avoid electrical continuity with the ground electrode due to contact with the rack, which is equivalent to the case where the housing and the ground electrode 50 are connected. Insulation is ensured between the chassis and the metal parts of the rack.
  • the countermeasure effect is affected depending on the wire diameter and length of the power cable 30, the wire diameter and length of the ground wire 42, and the wire diameter and length of the ground wire 41.
  • the power cable 30 of the DC power supply device 20 has a wire diameter of 38 sq and a length of 3 m
  • the ground wire 42 has a wire diameter of 38 sq and a length of 3 m
  • the ground wire 41 has a wire diameter of 38 sq and a length of 3 m. conditions are desirable.
  • the DC power supply device 20 also has an overcurrent detection circuit 21 and a noise countermeasure capacitor 22 .
  • the overcurrent detection circuit 21 monitors the current value of each power cable 30 and stops the output when an overcurrent is detected.
  • the noise countermeasure capacitor 22 is installed between the ground terminal and each power cable 30 .
  • FIG. 2 is a diagram showing an internal circuit failure image according to a conventional lightning surge countermeasure method.
  • the countermeasure effect of the lightning protection method shown in FIG. 1 is insufficient, part of the lightning surge current may enter the DC power supply device 20 and damage, for example, the noise countermeasure capacitor 22 . Also, if the distance between the two power cables 30 is short, there is a possibility that the internal circuit 24 and the like will be damaged by the discharge.
  • noise countermeasure capacitor 22, internal circuit 24, etc. are circuits that function in an emergency such as when electromagnetic noise occurs outside, the user may not notice a failure during normal use. Therefore, there is a possibility that the user will continue to use these devices while they are out of order.
  • connection between the DC power supply device 20 and the lightning protection system 10 may occur due to the case of the DC power supply device 20 being directly connected to the ground electrode 50 or the insulation between the case and the rack being improper. Condition may not be appropriate.
  • wire diameter and length of the power cable 30, the wire diameter and length of the ground wire 42, and the wire diameter and length of the ground wire 41 may not be appropriate.
  • Example 1 Next, Example 1 will be described.
  • the device such as the noise countermeasure capacitor 22 and the internal circuit 24
  • an example of displaying information indicating the failure of the device will be shown. .
  • FIG. 3 is a system configuration diagram of the lightning protection system according to the first embodiment. Note that the DC power supply device 20, which is an example of the device to be protected, is the same as in FIG.
  • the lightning protection system 10 is a system for protecting the DC power supply device 20, which is the equipment to be protected, from lightning surges.
  • the lightning protection system 10 comprises a first lightning arrester 11 , two second lightning arresters 12 , a controller 13 , a detector 14 and two switches 15 .
  • the first lightning arrester 11 and the two second lightning arresters 12 are the same as in FIG. 1, and are SPDs such as metal oxide varistors (MOVs), for example.
  • SPDs such as metal oxide varistors (MOVs), for example.
  • the detector 14 is composed of a first detector 14a and a second detector 14b.
  • the first detector 14a and the second detector 14b each inject a signal and receive a signal reflected from each element or connection point. Also, the first detector 14 a and the second detector 14 b inject inspection signals between the power cable 30 and the second lightning arrester 12 .
  • the inspection signal is a signal for inspecting the internal failure of the DC power supply device 20 .
  • the detector 16 is composed of a third detector 16 a and a fourth detector 16 b, receives the inspection signal injected by the detector 14 and transmits it to the control device 13 .
  • the control device 13 is a device that inspects the internal failure of the protected device. Based on the inspection signal received by the detector 16, the control device 13 inspects the internal failure of the DC power supply device 20 and displays the inspection result.
  • FIG. 4 is a functional configuration diagram of a control device according to the first embodiment;
  • the control device 13 includes an integrated control section 132 , an input reception section 134 , a failure determination section 135 , a storage section 136 and a display section 137 .
  • the input reception unit 134 receives a failure check instruction from the user or other operation equipment.
  • the failure check is a function of inspecting the internal failure of the DC power supply device 20 .
  • the failure determination unit 135 receives the inspection signal from the detector 16 and determines whether or not there is a failure inside the DC power supply device 20 based on the received inspection signal.
  • the storage unit 136 stores various types of information, specifically, normal waveform information 901 .
  • the normal waveform information 901 is information indicating the waveform of the inspection signal when the DC power supply device 20 is in a normal state.
  • Failure determination unit 135 determines whether or not there is a failure inside DC power supply device 20 by comparing normal waveform information 901 with the received inspection signal.
  • the display unit 137 displays the determination result by the failure determination unit 135.
  • FIG. 5 is a flowchart illustrating an example of the flow of control processing according to the first embodiment
  • the input reception unit 134 of the control device 13 receives a failure check instruction from the user or the like (step S21).
  • the failure determination unit 135 causes the first detector 14a and the second detector 14b to inject inspection signals (step S22).
  • the failure determination unit 135 acquires inspection signals received by the third detector 16a and the fourth detector 16b (step S23).
  • the failure determination unit 135 calculates the difference between the waveform of the acquired test signal and the waveform indicated in the normal waveform information 901 (step S24).
  • a known method may be used to calculate the waveform difference.
  • the failure determination unit 135 calculates a statistical value or the like indicating the difference.
  • the failure determination unit 135 determines whether the calculated difference exceeds the threshold (step S25).
  • the threshold is set in advance according to the method of calculating the waveform difference.
  • step S25: Yes the display unit 137 displays information indicating that there is a failure (step S26). If the failure determination unit 135 determines that the difference does not exceed the threshold (step S25: No), the display unit 137 displays information indicating no failure (step S27).
  • Example 2 Next, Example 2 will be described.
  • the second embodiment as a technique for solving the problem that the connection state between the DC power supply device 20 and the lightning protection system 10 may not be appropriate, an example of displaying information indicating the connection state of the equipment will be described.
  • the differences from the first embodiment will be mainly described, and the same reference numerals as those used in the description of the first embodiment will be used for those having the same functional configuration as the first embodiment. given, and its explanation is omitted.
  • FIG. 6 is a system configuration diagram of a lightning protection system according to the second embodiment.
  • a lightning protection system 10 according to the second embodiment has a configuration in which a resistance circuit 17 is added to the lightning protection system 10 according to the first embodiment.
  • the detector 14 according to Example 2 injects the inspection signal into the ground line 40 .
  • the inspection signal is a signal for inspecting whether or not the connection state between the DC power supply device 20 and the lightning protection system 10 is appropriate.
  • the resistance circuit 17 changes the impedance between the second lightning arrester 12 and the DC power supply device 20 and the ground electrode 50 under the control of the control device 13 . Normally, the resistance value of the resistance circuit 17 is approximately 0 ⁇ .
  • FIG. 7 is a functional configuration diagram of a control device according to the second embodiment.
  • a control device 13 according to the second embodiment has a configuration in which a connection determination unit 138 and an impedance control unit 139 are added to the control device 13 according to the first embodiment.
  • the input reception unit 134 receives an instruction to check the connection of the ground wire from the user or other operation equipment.
  • the ground wire connection check is a function of inspecting the connection state of the ground wire 40 of the DC power supply device 20 .
  • the connection determination unit 138 receives the inspection signal from the detector 16 and determines whether or not the connection state of the ground wire 40 of the DC power supply device 20 is normal based on the received inspection signal.
  • the impedance control section 139 controls the impedance of the resistance circuit 17 . Specifically, when the test signal is injected into the detector 16 (eg, immediately before), the impedance of the resistance circuit 17 is increased. Thus, the connection determination unit 138 can determine whether the connection state is normal or not based on whether or not the detection signal can be received by the detector 16 even when the impedance of the resistance circuit 17 is high. can.
  • the display unit 137 displays the determination result by the connection determination unit 138.
  • the input reception unit 134 obtains the impedance [Z] of the ground line from the two second lightning arresters 12 to the ground electrode 50 (when the resistance value of the resistance circuit 17 is 0 ⁇ ) and the ground resistance value [R ] will be accepted.
  • the relationship between the input impedance [Z] and the ground resistance value [R] is Z ⁇ R, that is, the value (Z ⁇ R) obtained by subtracting the ground resistance value from the impedance is If it is larger than the preset reference value, the display unit 137 displays that the two second lightning arresters 12 are not sufficiently effective.
  • the user may measure the impedance [Z] and the ground resistance value [R], or the lightning protection system 10 may include a circuit capable of measuring the impedance [Z] and the ground resistance value [R].
  • FIG. 8 is a flowchart illustrating an example of the flow of control processing according to the second embodiment.
  • the input reception unit 134 of the control device 13 receives an instruction to check the connection of the ground wire from the user or the like (step S31).
  • the impedance control section 139 transmits a high impedance control signal to the resistance circuit 17 (step S32).
  • the high impedance control signal is a signal indicating control for increasing impedance.
  • Resistor circuit 17 raises the impedance when it receives the high impedance control signal.
  • connection determination unit 138 causes the first detector 14a and the second detector 14b to inject inspection signals (step S33). The connection determination unit 138 then determines whether or not the third detector 16a and the fourth detector 16b have received the inspection signal (step S34).
  • connection determination unit 138 determines that the inspection signal has been received (step S34: Yes)
  • the display unit 137 displays information indicating normal connection (step S35). Further, when the connection determination unit 138 determines that the inspection signal has not been received (step S34: No), the display unit 137 displays information indicating a connection abnormality (step S36).
  • Example 3 Next, Example 3 will be described.
  • the wire diameter and length of the power cable 30, the wire diameter and length of the ground wire 42, and the wire diameter and length of the ground wire 41 may not be appropriate.
  • an example of displaying information indicating whether or not the connection line is proper will be shown.
  • the differences from the second embodiment will be mainly described, and the same reference numerals as those used in the description of the second embodiment will be used for those having the same functional configuration as the second embodiment. given, and its explanation is omitted.
  • the detector 14 according to Example 3 injects an inspection signal into the ground line 40 .
  • the inspection signal is a signal for inspecting whether or not the ground lines 40, 41, 42 are appropriate in linearity, length, and the like.
  • FIG. 9 is a functional configuration diagram of a control device according to the third embodiment.
  • a control device 13 according to the third embodiment has a configuration in which a ground wire adequacy determining unit 140 is added to the control device 13 according to the second embodiment.
  • the input reception unit 134 receives an instruction to check the suitability of the grounding wire from the user or other operation equipment.
  • the ground wire suitability check is a function of inspecting whether or not the linearity, length, etc. of the ground wires 40, 41, 42 of the DC power supply device 20 are appropriate.
  • the storage unit 136 according to the third embodiment further stores failure determination result information 902 and impedance characteristic information 903 in addition to the storage unit 136 according to the second embodiment.
  • the failure determination result information 902 is information indicating the determination result by the failure determination unit 135 .
  • the impedance characteristic information 903 is information set in advance as information indicating impedance characteristics of the ground lines 40, 41, and 42 having a high countermeasure effect.
  • the ground wire suitability determination unit 140 receives the measurement results of the current value and the voltage value from each detector, and determines whether or not the ground wires 40, 41, 42, etc. are appropriate based on the received measurement results. do.
  • the display unit 137 displays the result of determination by the grounding wire adequacy determination unit 140 .
  • FIG. 10 is a flowchart illustrating an example of the flow of control processing according to the third embodiment.
  • the input receiving unit 134 of the control device 13 receives an instruction to check the suitability of the grounding wire from the user (step S401).
  • the integrated control unit 132 reads out the failure determination result information 902 from the storage unit 136 and determines whether or not the failure determination result indicates no failure (step S402).
  • the display unit 137 displays information indicating that the ground wire appropriateness check is not possible (step S403). This prompts the user to perform a failure check first, because if there is a failure inside the DC power supply device 20, it cannot be determined whether or not the grounding wire is proper.
  • the impedance control unit 139 transmits a high impedance control signal to the resistance circuit 17 (step S404). Resistor circuit 17 raises the impedance when it receives the high impedance control signal.
  • the ground wire adequacy determination unit 140 receives the measurement results of the current value and the voltage value from each detector (step S405).
  • Each detector is a first detector 14a, a second detector 14b, a third detector 16a and a fourth detector 16b.
  • the grounding wire adequacy determining unit 140 calculates impedance characteristics from the measurement results (step S406). Then, the ground wire adequacy determination unit 140 calculates the difference between the calculated impedance identification and the appropriate impedance characteristic (step S407). Appropriate impedance characteristics are indicated in the impedance characteristic information 903. FIG.
  • FIG. 11 is a diagram for explaining a method of calculating a difference in impedance characteristics according to the third embodiment.
  • FIG. 11A is an example of data included in the impedance characteristic information 903.
  • FIG. 11A is an example of data included in the impedance characteristic information 903.
  • the dashed-dotted line 903a shows the impedance characteristics when the grounding wires 41 and 42 are 5 m long and 22 sq in diameter with respect to the power cable 30 with a length of 5 m and a wire diameter of 22 sq.
  • a solid line 903b represents the impedance characteristics of the power cable 30 having a length of 10 m and a wire diameter of 14 sq, and the ground wires 41 and 42 having a length of 10 m and a wire diameter of 14 sq.
  • a dotted line 903c indicates the impedance characteristics of the power cable 30 having a length of 20 m and a wire diameter of 38 sq, and the ground wires 41 and 42 having a length of 20 m and a wire diameter of 38 sq.
  • the grounding wire adequacy determination unit 140 calculates the difference from these data. As shown in FIG. 11A, when a plurality of data are included in the impedance characteristic information, the difference between each data is calculated, and the minimum value of the calculated differences is used. For example, when the impedance characteristic calculated from the measurement result is similar to the solid line 903b as shown in FIG. 11B, the calculated difference value is small. Also, when the impedance characteristic calculated from the measurement result does not resemble any of the impedance characteristics as shown in FIG. 11(c), the calculated difference value is large.
  • a known method may be used for calculating the difference between these waveforms, and the grounding wire adequacy determining unit 140 calculates, for example, a statistical value indicating the difference.
  • the grounding wire adequacy determining unit 140 determines whether the difference exceeds the threshold (step S408).
  • the threshold is set in advance through experiments and the like.
  • step S408: Yes the display unit 137 displays information indicating the ground wire suitability (step S409). Further, when the ground wire suitability determination unit 140 determines that the difference does not exceed the threshold (step S408: No), the display unit 137 displays information indicating the ground wire suitability (step S410).
  • control device 13 can be implemented, for example, by causing a computer to execute a program describing the processing details described in the present embodiment.
  • this "computer” may be a physical machine or a virtual machine on the cloud.
  • the "hardware” described here is virtual hardware.
  • the above program can be recorded on a computer-readable recording medium (portable memory, etc.), saved, or distributed. It is also possible to provide the above program through a network such as the Internet or e-mail.
  • FIG. 12 is a diagram showing a hardware configuration example of the computer.
  • the computer of FIG. 12 has a drive device 1000, an auxiliary storage device 1002, a memory device 1003, a CPU 1004, an interface device 1005, a display device 1006, an input device 1007, an output device 1008, etc., which are connected to each other via a bus B, respectively.
  • a program that implements the processing in the computer is provided by a recording medium 1001 such as a CD-ROM or memory card, for example.
  • a recording medium 1001 such as a CD-ROM or memory card
  • the program is installed from the recording medium 1001 to the auxiliary storage device 1002 via the drive device 1000 .
  • the program does not necessarily need to be installed from the recording medium 1001, and may be downloaded from another computer via the network.
  • the auxiliary storage device 1002 stores installed programs, as well as necessary files and data.
  • the memory device 1003 reads and stores the program from the auxiliary storage device 1002 when a program activation instruction is received.
  • the CPU 1004 implements functions related to the device according to programs stored in the memory device 1003 .
  • the interface device 1005 is used as an interface for connecting to the network.
  • a display device 1006 displays a GUI (Graphical User Interface) or the like by a program.
  • An input device 1007 is composed of a keyboard, a mouse, buttons, a touch panel, or the like, and is used to input various operational instructions.
  • the output device 1008 outputs the calculation result.
  • a lightning protection system comprising a lightning arrester, a detector and a controller, comprising: the detector injecting an inspection signal into a ground line connecting the device to be protected and the lightning arrester and receiving the injected inspection signal;
  • the control device is Failure inside the protected device based on whether or not the detector can receive the inspection signal via the protected device, the waveform of the received inspection signal, or the impedance characteristics calculated from the received inspection signal, a determination unit that determines the connection state of the ground wire or the adequacy of the ground wire;
  • a display unit that displays the determination result by the determination unit, Lightning protection system.
  • the control device further includes a storage unit that stores normal waveform information indicating the waveform of the inspection signal in a normal state, The determination unit compares the normal waveform information and the inspection signal to determine whether there is a failure inside the protected device.
  • a lightning protection system according to claim 1. (Section 3) further comprising a resistance circuit that changes impedance between the lightning arrester and the protected device and a ground electrode; The control device further comprises an impedance control unit that increases the impedance of the resistance circuit before injecting the test signal into the detector, The determination unit determines whether the connection state of the ground line is normal based on whether the inspection signal can be received via the protected device.
  • (Section 4) an input reception unit that receives an input of an impedance between the lightning arrester and the protected device and the ground electrode and a ground resistance value of the ground electrode; When the value obtained by subtracting the ground resistance value from the impedance is larger than a preset reference value, the display unit displays information indicating that the effect of the lightning arrester is not sufficiently obtained.
  • Lightning protection system according to paragraph 3. (Section 5) The determination unit receives measurement results of the current value and the voltage value from the detector, calculates impedance characteristics from the measurement results, and determines whether or not the ground wire is appropriate based on the calculated impedance characteristics. judge, Lightning protection system according to any one of paragraphs 1 to 4.
  • (Section 7) A computer implemented method comprising: Based on whether or not the test signal injected into the ground line connecting the protected device and the lightning arrester can be received via the protected device, the waveform of the received test signal, or the impedance characteristics calculated from the received test signal a step of determining an internal failure of the protected device, a connection state of the ground wire, or adequacy of the ground wire; A step of displaying the determination result by the determination unit, Lightning protection method. (Section 8) A program for causing a computer to function as each unit in the control device according to item 6.
  • Lightning Protection System 11 First Lightning Arrestor 12 Second Lightning Arrestor 13 Control Device 14 Detector 16 Detector 17 Resistor Circuit 20 DC Power Supply Device 21 Overcurrent Detection Circuit 22 Noise Countermeasure Capacitor 23 Insulating Bushing 24 Internal Circuit 30 Power Cables 40, 41 , 42 ground wire 50 ground electrode 132 integrated control unit 134 input reception unit 135 failure determination unit 136 storage unit 137 display unit 138 connection determination unit 139 impedance control unit 140 ground wire appropriateness determination unit 901 normal waveform information 902 failure determination result information 903 impedance Characteristic information 1000 Drive device 1001 Recording medium 1002 Auxiliary storage device 1003 Memory device 1004 CPU 1005 interface device 1006 display device 1007 input device 1008 output device

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  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

L'invention concerne un système de protection contre la foudre comprenant un parafoudre, un détecteur et un appareil de commande, le détecteur entrant un signal d'inspection dans une ligne de mise à la terre qui connecte un dispositif à protéger au parafoudre et reçoit le signal d'inspection entré, et l'appareil de commande comprend : une unité de détermination qui, sur la base du fait que le signal d'inspection peut être reçu ou non par le détecteur via le dispositif à protéger et sur la base de la forme d'onde du signal d'inspection reçu ou des caractéristiques d'impédance calculées à partir du signal d'inspection reçu, détermine une anomalie à l'intérieur du dispositif à protéger, un état de connexion de la ligne de mise à la terre ou la comptabilité de la ligne de mise à la terre ; et une unité d'affichage qui affiche un résultat de détermination issu de l'unité de détermination.
PCT/JP2021/006446 2021-02-19 2021-02-19 Système de protection contre la foudre, appareil de commande, procédé de protection contre la foudre et programme WO2022176170A1 (fr)

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PCT/JP2021/006446 WO2022176170A1 (fr) 2021-02-19 2021-02-19 Système de protection contre la foudre, appareil de commande, procédé de protection contre la foudre et programme

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013029351A (ja) * 2011-07-27 2013-02-07 Kazuo Yamamoto 風車ブレード用避雷導線の断線検出装置
JP2016093039A (ja) * 2014-11-07 2016-05-23 オムロン株式会社 太陽光発電システムの検査方法および検査装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013029351A (ja) * 2011-07-27 2013-02-07 Kazuo Yamamoto 風車ブレード用避雷導線の断線検出装置
JP2016093039A (ja) * 2014-11-07 2016-05-23 オムロン株式会社 太陽光発電システムの検査方法および検査装置

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