WO2022176169A1 - Système de protection contre la foudre, dispositif de commande, procédé de protection contre la foudre et programme - Google Patents

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

Info

Publication number
WO2022176169A1
WO2022176169A1 PCT/JP2021/006445 JP2021006445W WO2022176169A1 WO 2022176169 A1 WO2022176169 A1 WO 2022176169A1 JP 2021006445 W JP2021006445 W JP 2021006445W WO 2022176169 A1 WO2022176169 A1 WO 2022176169A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
lightning protection
protected
protection system
determination unit
Prior art date
Application number
PCT/JP2021/006445
Other languages
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.)
Filing date
Publication date
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/JP2021/006445 priority Critical patent/WO2022176169A1/fr
Publication of WO2022176169A1 publication Critical patent/WO2022176169A1/fr

Links

Images

Classifications

    • 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
    • H02H3/08—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 excess current
    • H02H3/087—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 excess current for dc applications
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage

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 operation of the lightning arrester causes a temporary short-circuit state on the output side of the protected device when a lightning surge current passes through, and there is a problem that the current output from the protected device increases.
  • a device to be protected such as a DC power supply device has an overcurrent protection function
  • the overcurrent protection function may be activated and the output may be stopped.
  • the disclosed technology aims to suppress an increase in the output current of a protected device when a lightning surge occurs.
  • the disclosed technology is a lightning protection system comprising a current suppressor, a lightning arrester, a current measuring device, and a control device, wherein the current measuring device measures a current value flowing from a device to be protected to the lightning arrester, and the control device is a current determination unit that determines whether the current value measured by the current measuring device exceeds a reference value, and an output from the protected device when it is determined that the current value exceeds the reference value and a current controller for controlling the current suppressor to limit the amount of current drawn.
  • FIG. 10 is a diagram showing an image of failure of an internal circuit by a conventional lightning protection method
  • FIG. 10 is a diagram showing an operation outline of an overcurrent protection function according to 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. FIG. 11 is a system configuration diagram of a lightning protection system according to Example 3;
  • 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 functional configuration diagram of a control device according to Embodiment 4;
  • FIG. 11 is a flow chart showing an example of the flow of control processing according to the fourth embodiment;
  • FIG. FIG. 11 is a diagram for explaining a method of calculating a difference in impedance characteristics according to Example 4; 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.
  • FIG. 3 is a diagram showing an overview of the operation of an overcurrent protection function based on a conventional lightning surge countermeasure method.
  • the overcurrent detection circuit 21 provided in the DC power supply device 20 detects the overcurrent, and the overcurrent protection function operates, which may cause the output to stop. be.
  • the output of the DC power supply device 20 may be stopped and stable power supply may not be possible.
  • Example 1 Example 2, Example 3, and Example 4 will be described.
  • Example 1 shows an example of a configuration for solving the problem that the output current of the DC power supply device 20 shown in FIG. 3 suddenly increases.
  • FIG. 4 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 between the power cable 30 and the second lightning arrester 12, and receive the signal reflected by each element or connection point.
  • the first detector 14 a and the second detector 14 b measure the current value between the power cable 30 and the second lightning arrester 12 and transmit data indicating the measured current value to the control device 13 .
  • the first detector 14a and the second detector 14b are an example of a current measuring device that measures the value of the current flowing from the device to be protected to the lightning arrester.
  • the control device 13 is a device that controls the opening and closing of the switch 15.
  • the control device 13 controls opening and closing of the switch 15 based on the current value measured by the detector 14 . That is, the control device 13 controls to open (OFF) the switch 15 when both the current values measured by the first detector 14a and the second detector 14b exceed the reference value.
  • the lightning protection system 10 suppresses the amount of current output from the DC power supply device 20 .
  • the two switches 15 are connected to the two power cables 30, respectively, and are in a short-circuit (ON) state in the initial state.
  • ON short-circuit
  • OFF open
  • the switch 15 is an example of a current suppressor for suppressing the amount of current output from the DC power supply device 20, which is an example of the device to be protected.
  • the current suppressor does not have to be a switch as long as it can suppress the amount of current output from the DC power supply device 20 under the control of the control device 13.
  • an element such as a high resistor, an inductor, or the like in which current does not easily flow. may be inserted in the middle of each power cable 30 .
  • FIG. 5 is a functional configuration diagram of a control device according to the first embodiment.
  • the control device 13 includes a current determination section 131 , an integrated control section 132 and a current control section 133 .
  • the current determination unit 131 receives data indicating current values from the first detector 14a and the second detector 14b. Then, it is determined whether or not the received current value exceeds the reference value.
  • the reference value is a value set in advance as a reference for the current value when a lightning surge occurs.
  • the integrated control unit 132 controls the control processing of the control device 13 as a whole.
  • the current control section 133 controls opening and closing of the switch 15 based on the determination result of the current determination section 131 .
  • FIG. 6 is a flowchart illustrating an example of the flow of control processing according to the first embodiment
  • the integrated control unit 132 periodically executes control processing, for example, every 1 microsecond.
  • the current determination unit 131 acquires the first current value and the second current value from the first detector 14a and the second detector 14b (step S11).
  • the first current value is the current value measured by the first detector 14a.
  • the second current value is the current value measured by the second detector 14b.
  • the current determination unit 131 determines whether both the first current value and the second current value exceed the reference value (step S12).
  • the current control unit 133 transmits an open (OFF) signal to each switch 15 (step S13).
  • Each switch 15 becomes an open (OFF) state when receiving an open (OFF) signal, and cuts off the current of the power cable 30 . That is, current control unit 133 controls switch 15 so as to suppress the amount of current output from DC power supply device 20 .
  • the current control unit 133 outputs the short-circuit (ON) signal to each It is transmitted to the switch 15 (step S14).
  • each switch 15 receives a short-circuit (ON) signal, it enters a short-circuit (ON) state and does not interrupt the current of the power cable 30 . That is, current control unit 133 controls switch 15 so as not to suppress the amount of current output from DC power supply device 20 .
  • the lightning protection system 10 According to the lightning protection system 10 according to the first embodiment, it is possible to grasp the occurrence of a lightning surge by measuring the current value in the path in which the lightning surge current is generated. Then, when the current value exceeds the reference value, the amount of current output from the DC power supply device 20 is suppressed. As a result, it is possible to suppress an increase in the current value of the output current from the DC power supply device 20 when a lightning surge occurs.
  • Example 2 Next, Example 2 will be described.
  • the second embodiment as a technique for solving the problem that the user may not notice the failure of 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. .
  • 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. 7 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 detector 16 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 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 third detector 16a and the fourth detector 16b are examples of current measuring devices that measure the value of current flowing from the device to be protected to the lightning arrester.
  • the inspection signal injected by the detector 14 is received by propagating to the detector 16 via the noise countermeasure capacitor 22 of the DC power supply device 20 . Since the two second lightning arresters 12 have high impedance, the inspection signal does not pass through, but it propagates depending on the frequency. It is desirable to set the capacitor 22 to a frequency that is easily propagated.
  • FIG. 8 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 an input reception unit 134, a failure determination unit 135, a storage unit 136, and a display unit 137 are added to the control device 13 according to the first embodiment.
  • 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. 9 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 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 3 Next, Example 3 will be described.
  • the third 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 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.
  • FIG. 10 is a system configuration diagram of a lightning protection system according to the third embodiment.
  • a lightning protection system 10 according to the third embodiment has a configuration in which a resistance circuit 17 is added to the lightning protection system 10 according to the second embodiment.
  • 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 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. 11 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 connection determination unit 138 and an impedance control unit 139 are added to the control device 13 according to the second 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 wire from the two second lightning arresters 12 to the ground electrode 50 (when the resistance value of the resistance circuit 17 is 0 ⁇ ), the ground resistance value [R ] will be accepted.
  • 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. 12 is a flowchart illustrating an example of the flow of control processing according to the third 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 4 Next, Example 4 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 third embodiment will be mainly described, and the same reference numerals as those used in the description of the third embodiment will be used for those having the same functional configuration as the third embodiment. given, and its explanation is omitted.
  • the detector 14 according to Example 4 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. 13 is a functional configuration diagram of a control device according to the fourth embodiment.
  • a control device 13 according to the fourth embodiment has a configuration in which a ground wire adequacy determining unit 140 is added to the control device 13 according to the third 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 fourth embodiment further stores failure determination result information 902 and impedance characteristic information 903 in addition to the storage unit 136 according to the third 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. 14 is a flowchart illustrating an example of the flow of control processing according to the fourth 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. 15 is a diagram for explaining a method of calculating the difference in impedance characteristics according to the fourth embodiment.
  • FIG. 15A is an example of data included in the impedance characteristic information 903.
  • FIG. 15A 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. 15(a), when a plurality of data are included in the impedance characteristic information, the difference from 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. 15B, 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. 15(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. 16 is a diagram showing a hardware configuration example of the computer.
  • the computer of FIG. 16 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.
  • 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 current suppressor, a lightning arrester, a current measuring device and a controller, The current measuring device measures a current value flowing from the device to be protected to the lightning arrester,
  • the control device is a current determination unit that determines whether the current value measured by the current measuring device exceeds a reference value; a current control unit that controls the current suppressor to suppress the amount of current output from the protected device when it is determined that the current value exceeds the reference value; Lightning protection system.
  • the current suppressor is a switch that cuts off a current output from the protected device in an open state, The current control unit controls to open the switch when it is determined that the current value exceeds the reference value.
  • a lightning protection system according to claim 1. The device to be protected is a DC power supply device that supplies a DC power supply, The current measuring device has two current measuring devices for measuring respective current values of two grounding wires connected to the lightning arrester from two power cables output from the DC power supply device, The current determination unit controls the current suppressor to suppress the amount of current output from the protected device when the current values of the two current measuring devices both exceed a reference value.
  • a lightning protection system according to paragraphs 1 or 2.
  • (Section 4) further comprising a signal receiver that receives the inspection signal injected by the current measuring device via the protected device;
  • the control device is a determination unit that determines whether or not an inspection signal received by the signal receiver is receivable or based on the waveform of the received signal;
  • a display unit that displays the determination result by the determination unit, A lightning protection system according to any one of paragraphs 1 to 3.
  • (Section 5) receiving measurement results of current and voltage values from the current measuring device and the signal receiver, calculating impedance characteristics from the measurement results, and determining whether the ground wire is appropriate based on the calculated impedance characteristics; It further comprises a ground wire adequacy determination unit that determines The display unit displays the determination result of the ground wire adequacy determination unit.
  • Lightning protection system a current determination unit that determines whether or not the current value flowing from the device to be protected to the lightning arrester exceeds a reference value; a current control unit that controls a current suppressor to suppress the amount of current output from the protected device when it is determined that the current value exceeds the reference value; Control device.
  • (Section 7) A computer implemented method comprising: a step of determining whether a current value flowing from the device to be protected to the lightning arrester exceeds a reference value; and controlling a current suppressor to suppress the amount of current output from the protected device when it is determined that the current value exceeds the reference value.
  • Lightning protection method. (Section 8) A program for causing a computer to function as each unit in the control device according to item 6.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

Ce système de protection contre la foudre comprend un suppresseur de courant, un parafoudre, un instrument de mesure de courant et un dispositif de commande, l'instrument de mesure de courant mesurant la valeur du courant circulant d'un dispositif protégé au parafoudre, et le dispositif de commande comprend une unité de détermination de courant qui détermine si oui ou non la valeur de courant mesurée par l'instrument de mesure de courant dépasse une valeur de référence, et une unité de commande de courant qui, si la valeur de courant a été déterminée comme dépassant la valeur de référence, commande le suppresseur de courant pour supprimer la quantité de courant délivrée par le dispositif protégé.
PCT/JP2021/006445 2021-02-19 2021-02-19 Système de protection contre la foudre, dispositif de commande, procédé de protection contre la foudre et programme WO2022176169A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/006445 WO2022176169A1 (fr) 2021-02-19 2021-02-19 Système de protection contre la foudre, dispositif de commande, procédé de protection contre la foudre et programme

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/006445 WO2022176169A1 (fr) 2021-02-19 2021-02-19 Système de protection contre la foudre, dispositif de commande, procédé de protection contre la foudre et programme

Publications (1)

Publication Number Publication Date
WO2022176169A1 true WO2022176169A1 (fr) 2022-08-25

Family

ID=82930386

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/006445 WO2022176169A1 (fr) 2021-02-19 2021-02-19 Système de protection contre la foudre, dispositif de commande, procédé de protection contre la foudre et programme

Country Status (1)

Country Link
WO (1) WO2022176169A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000013984A (ja) * 1998-06-18 2000-01-14 Nippon Telegr & Teleph Corp <Ntt> 通信機器用雷防護回路
WO2002017458A1 (fr) * 2000-08-22 2002-02-28 Mitsubishi Denki Kabushiki Kaisha Interrupteur différentiel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000013984A (ja) * 1998-06-18 2000-01-14 Nippon Telegr & Teleph Corp <Ntt> 通信機器用雷防護回路
WO2002017458A1 (fr) * 2000-08-22 2002-02-28 Mitsubishi Denki Kabushiki Kaisha Interrupteur différentiel

Similar Documents

Publication Publication Date Title
US10690709B2 (en) System for monitoring resistance and current in ground line
US11435409B2 (en) Temporary overvoltage and ground fault overvoltage protection based on arrester current measurement and analysis
US9829530B2 (en) Method for adapting an arc sensor
US20160141123A1 (en) Synthetic fault remote disconnect for a branch circuit
KR101456137B1 (ko) 과도 대지 전압 신호를 이용하여 아크와 코로나 방전을 검출하는 배전반(고압반, 저압반, 모터 제어반, 분전반)
CN110854809B (zh) 变压器中性点保护装置的检测方法及保护装置
CA2921170C (fr) Verificateur de mise a la terre a borne a resistance bifilaire
WO2022176169A1 (fr) Système de protection contre la foudre, dispositif de commande, procédé de protection contre la foudre et programme
JP2014176240A (ja) 避雷器監視システム
WO2022176170A1 (fr) Système de protection contre la foudre, appareil de commande, procédé de protection contre la foudre et programme
JP2018179633A (ja) 保護デバイス選定システム、装置、方法およびプログラム
US7148674B2 (en) Apparatus for automatically measuring a relatively wide range of leakage currents
AU2019200425B2 (en) System and method for single wire ground check measurement
KR101673819B1 (ko) 임피던스 보정 기능을 가지는 거리 계전기 및 이의 동작방법
CN101595617B (zh) 用于数据线路过压保护的设备
CN113075482A (zh) 一种电力仪表
KR200489928Y1 (ko) 절연저항 측정장치
KR101409479B1 (ko) 단락감지식 서지카운터를 갖는 서지보호장치
JP4196026B2 (ja) 襲雷検出回路
Radulovic et al. Effects of different combination wave generator design on surge protective devices characteristics in cascade protection systems
CN113125897A (zh) 存储器、架空线路单相接地故障检测方法、系统和设备
EP4012868A1 (fr) Système de gestion d&#39;énergie
KR100624779B1 (ko) 절연물의 실시간 광대역 온도 및 누설전류 측정 장치
EP2936641B1 (fr) Procédé et appareil ayant trait à la protection contre les surtensions
US20230160931A1 (en) Voltage presence determination system for a high voltage electrical network

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21926602

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21926602

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP