JP2011057009A - Railway signal protector - Google Patents

Railway signal protector Download PDF

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JP2011057009A
JP2011057009A JP2009206711A JP2009206711A JP2011057009A JP 2011057009 A JP2011057009 A JP 2011057009A JP 2009206711 A JP2009206711 A JP 2009206711A JP 2009206711 A JP2009206711 A JP 2009206711A JP 2011057009 A JP2011057009 A JP 2011057009A
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signal
protector
pole
lightning
railway signal
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JP5289248B2 (en
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Masaaki Kadowaki
雅明 門脇
Yoshihiro Haga
善浩 芳賀
Hideki Arai
英樹 新井
Kazutoshi Sato
和敏 佐藤
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Railway Technical Research Institute
Hokkaido Railway Co
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Railway Technical Research Institute
Hokkaido Railway Co
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent burning of a railway signal protector and a railway signal apparatus due to continuous abnormal current by a ground fault accident without involving a large amount of cost. <P>SOLUTION: A grounding pole line 14 of a three-pole arrester 11 for a first protector 10 and a grounding pole line 24 of a three-pole arrester 21 for a second protector 20 are connected to a grounding line 8 through a relay contact 31. When thunder does not come close, the relay contact 31 of a relay 32 is open, and thereby the railway signal protector achieves a measure against the ground fault accident. When thunder comes close and a detection signal of an electric field sensor 34 exceeds a threshold value, a detection circuit 33 drives the relay 32 to close the relay contact 31, and thereby the railway signal protector achieves a measure against the thunder damage. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、鉄道の沿線に設置されている鉄道信号機器を雷害から保護する鉄道信号用保安器に関するものである。 The present invention relates to a railway signal protector that protects railway signal equipment installed along a railway line from lightning damage.

特開平９−１８４８９０号公報（特許文献１）には、一対の電源線にブレーカを介して電力供給源に接続された電気設備、雷雲の接近を検知する雷検知器、及びブレーカを駆動する雷警報器とで構成されたシステムが記載されている。このシステムは、雷雲の接近を雷検知器が検出した場合には、雷警報器がブレーカを作動させて電気設備に電源供給線から異常な雷サージ電流が流れ込まないようにして、電気設備を雷害から保護するものである。 Japanese Patent Application Laid-Open No. 9-184890 (Patent Document 1) discloses electrical equipment connected to a power supply source via a breaker to a pair of power lines, a lightning detector that detects the approach of a thundercloud, and a lightning that drives the breaker. A system composed of an alarm device is described. In this system, when a lightning detector detects that a thundercloud is approaching, the lightning alarm activates the breaker so that no abnormal lightning surge current flows into the electrical equipment from the power supply line. It protects from harm.

鉄道信号用機器は、鉄道線路の所定区間内における列車の存在の有無を検出する踏切制御子や、該踏切制御子の検出信号によって踏切警報機や踏切遮断機等を制御する踏切制御器の如き鉄道信号機器は、電源を落とすことは許されないので、特許文献１に記載するような雷害対策は採用できない。そこで、鉄道信号用機器には耐雷トランスや信号用保安器を用いた雷害対策が施されている。 Railroad signal equipment is a railroad crossing controller that detects the presence or absence of a train within a predetermined section of a railroad track, and a railroad crossing controller that controls a railroad crossing warning device, a crossing crossing breaker, etc. according to a detection signal of the railroad crossing controller Since railroad signal equipment is not allowed to turn off the power supply, the lightning damage countermeasure described in Patent Document 1 cannot be adopted. Therefore, lightning damage countermeasures using lightning-resistant transformers and signal protectors are applied to railway signal equipment.

例えば特開２００５−１５３６４６号公報（特許文献２）には、踏切制御子と踏切制御器のそれぞれに耐雷トランスを設置し、雷サージが軌道又はケーブル線路等に侵入すると、踏切制御子と踏切制御器にそれぞれ設置されている信号用保安器が放電動作して雷サージを軌道又は大地に吸収させ、これによって踏切制御子と踏切制御器を雷害から保護する鉄道信号用保安器が記載されている。 For example, in Japanese Patent Application Laid-Open No. 2005-153646 (Patent Document 2), when a lightning-proof transformer is installed in each of a crossing controller and a crossing controller and a lightning surge enters a track or a cable line, the crossing controller and the crossing control. There is a description of a railroad signal protector that discharges the signal protector installed in each unit and absorbs the lightning surge to the track or ground, thereby protecting the railroad crossing controller and the railroad crossing controller from lightning damage. Yes.

特開平５−２９４２４３号公報（特許文献３）には、踏切への列車接近を検出する踏切制御子、この踏切制御子の動作状態を保持するリレー、リレーの制御線、及びリレー用電源とから成る鉄道信号用保安器において、前記リレー用電源としてＤＣ／ＤＣコンバータを用い、且つその出力側を雷サージから保護する信号用保安器を備えた鉄道信号用保安器が記載されている。 Japanese Patent Application Laid-Open No. 5-294243 (Patent Document 3) includes a railroad crossing controller that detects the approach of a train to a railroad crossing, a relay that holds the operating state of the railroad crossing controller, a relay control line, and a relay power supply. A railway signal protector comprising a signal protector that uses a DC / DC converter as the relay power source and protects its output side from lightning surge is described.

特開２００３−１６５４４０号公報（特許文献４）には、三極アレスタと一対のバリスタとからなる信号用保安器が踏切制御子や踏切制御器に適用され、これらの鉄道信号機器を雷害から保護する鉄道信号用保安器が記載されている。 In JP 2003-165440 A (Patent Document 4), a signal protector composed of a three-pole arrester and a pair of varistors is applied to a crossing controller and a crossing controller, and these railway signal devices are protected from lightning damage. The protector for the railway signal to be protected is described.

これら従来の鉄道信号用保安器を簡略化して示すと図２の如くとなる。即ち、図２において、鉄道信号機器１は、一対の入力側信号線２，３と一対の出力側信号線４，５を備えたものである。三極アレスタ１１とバリスタ１２，１３とで構成された第１の信号用保安器１０は一対の入力側信号線２，３に侵入してきた雷サージは三極アレスタ１１の接地極を介して軌道又は大地に吸収させ、また、三極アレスタ２１とバリスタ２２，２３とで構成された第２の信号用保安器２０は一対の出力側信号線４，５に侵入してきた雷サージを三極アレスタ２１の接地極が接続された接地線を介して軌道又は大地に吸収させ、雷害から鉄道信号機器１を保護するものである。 These conventional railroad signal protectors are shown in a simplified manner as shown in FIG. In other words, in FIG. 2, the railway signal device 1 includes a pair of input side signal lines 2 and 3 and a pair of output side signal lines 4 and 5. In the first signal protector 10 composed of the three-pole arrester 11 and the varistors 12 and 13, the lightning surge that has entered the pair of input-side signal lines 2 and 3 passes through the ground pole of the three-pole arrester 11. Alternatively, the second signal protector 20 composed of the three-pole arrester 21 and the varistors 22 and 23 absorbs the lightning surge that has entered the pair of output-side signal lines 4 and 5 into the three-pole arrester. The railroad signal equipment 1 is protected from lightning damage by being absorbed into the track or the ground via a grounding wire to which 21 grounding poles are connected.

ところで、上述の鉄道信号用保安器において、鉄道信号機器の設置地点の近所で地絡事故が発生すると、地絡事故による連続的な異常電流が接地線を介して信号用保安器に印加され、信号用保安器や鉄道信号機器を焼損することがある。これは、信号用保安器は電流耐量が小さいためである。 By the way, in the above-mentioned railway signal protector, when a ground fault occurs in the vicinity of the installation point of the railway signal device, a continuous abnormal current due to the ground fault is applied to the signal protector via the ground line, Signal protectors and railway signal equipment may be burned out. This is because the signal protector has a small current resistance.

特開平９−１８４８９０号公報JP-A-9-184890 特開２００５−１５３６４６号公報JP 2005-153646 A 特開平５−２９４２４３号公報JP-A-5-294243 特開２００３−１６５４４０号公報JP 2003-165440 A

株式会社サンコーシャのカタログ 「保安器（信号用）」Catalog of Sankosha Co., Ltd. “Protective device (for signal)”

本発明が解決しようとする課題は、鉄道の沿線に設置されている鉄道信号機器の雷害から保護する鉄道信号用保安器において、多大なコストを要しないで、地絡事故による鉄道信号保安器や鉄道信号機器が焼損しないようにすることである。 The problem to be solved by the present invention is a railway signal protector that protects against lightning damage of railway signal equipment installed along the railway line. And to prevent burnout of railway signaling equipment.

上述の課題を解決する鉄道信号用保安器を、三極アレスタを含む信号用保安器と、前記三極アレスタの接地極と接地線との間に接続された開閉装置と、雷が接近していないときには前記三極アレスタの接地極を前記接地線から開放し且つ雷が接近したときには前記三極アレスタの接地極を前記接地線に接続するように前記開閉装置を制御する制御装置とで構成した。 A railroad signal protector that solves the above-mentioned problems, a signal protector including a three-pole arrester, a switchgear connected between a grounding electrode and a grounding wire of the three-pole arrester, and a lightning approach. When there is not, the grounding pole of the three-pole arrester is opened from the grounding line, and when the lightning approaches, the control unit is configured to control the switchgear so as to connect the grounding pole of the three-pole arrester to the grounding line. .

本発明により、鉄道の沿線に設置されている鉄道信号機器の雷害から保護する鉄道信号用保安器において、多大なコストを要しないで、地絡事故による鉄道信号保安器や鉄道信号機器が焼損しないようにすることができた。 According to the present invention, in a railway signal protector that protects against lightning damage of a railway signal device installed along a railway line, the railway signal protector and the railway signal device due to a ground fault are burned out without incurring great costs. I was able to avoid it.

本発明に係る鉄道信号用保安器の構成図である。It is a lineblock diagram of the railroad signal protector concerning the present invention. 従来の鉄道信号用保安器の構成図である。It is a block diagram of the conventional railway signal protector.

本発明に係る鉄道信号用保安器は、一対の電極がバリスタを介して鉄道信号機器の一対の信号線にそれぞれ接続された三極アレスタを含む信号用保安器と、前記三極アレスタの接地極と接地線との間に接続された開閉装置と、雷が接近していないときには前記三極アレスタの接地極を前記接地線から開放し且つ雷が接近したときには前記三極アレスタの接地極を前記接地線に接続するように前記開閉装置を制御する制御装置とで構成されたものである。 A railway signal protector according to the present invention includes a signal protector including a three-pole arrester in which a pair of electrodes are connected to a pair of signal lines of a railway signal device via a varistor, and a grounding pole of the three-pole arrester. And a switchgear connected between the grounding wire and the grounding electrode of the three-pole arrester when the lightning is not approaching, and opening the grounding electrode of the three-pole arrester when the lightning is approaching And a control device that controls the switchgear so as to be connected to a ground line.

図1に示す本発明の実施例は、一対の入力側信号線２，３と一対の出力側信号線４，５を備えた鉄道信号機器１に、雷対策用の第１の信号用保安器１０と第２の信号用保安器２０を備えて構成した鉄道信号用保安器である。三極アレスタ１１と一対のバリスタ１２，１３からなる第１の保安器において、三極アレスタ１１の一対の電極はバリスタ１２と１３を介して鉄道信号機器１の一対の入力側信号線２，３にそれぞれ接続されている。三極アレスタ２１と一対のバリスタ２２，２３からなる第２の保安器２０において、三極アレスタ２１の一対の電極は、バリスタ２２，２３を介して鉄道信号機器１の一対の信号線４と５にそれぞれ接続されている。 The embodiment of the present invention shown in FIG. 1 includes a first signal protector for lightning protection in a railway signal device 1 having a pair of input signal lines 2 and 3 and a pair of output signal lines 4 and 5. 10 and a second signal protector 20, a railway signal protector. In the first protector including the three-pole arrester 11 and the pair of varistors 12 and 13, the pair of electrodes of the three-pole arrester 11 are connected to the pair of input-side signal lines 2 and 3 of the railway signal device 1 via the varistors 12 and 13. Are connected to each. In the second protector 20 including the three-pole arrester 21 and the pair of varistors 22 and 23, the pair of electrodes of the three-pole arrester 21 are connected to the pair of signal lines 4 and 5 of the railway signal device 1 via the varistors 22 and 23. Are connected to each.

第１の信号用保安器１０の三極アレスタ１１の接地極線１４と第２の信号用保安器２０の三極アレスタ２１の接地極線２４は、開閉装置であるリレー接点３１を介して接地線６に接続されている。リレー接点３１は、検知回路３３によって駆動されるリレー３２の接点である。検知回路３３は、雷センサである電界センサ３４の検知信号を入力とし、当該検知信号が閾値を超えたときにリレー３２を駆動するものである。電界センサ３４、検知回路３３、及びリレー３２は、リレー接点３１の開閉を制御する制御装置を構成する。なお、制御装置の検知回路３３は雷を検知しないときにはHi出力、雷を検知したときにはLo出力となるように構成されており、従ってリレー３２は検知回路３３のHi出力でリレー接点３１を開き、検知回路３３のLo出力でリレー接点３１を閉じる。 The grounding pole wire 14 of the three-pole arrester 11 of the first signal protector 10 and the grounding pole line 24 of the three-pole arrester 21 of the second signal protector 20 are grounded via a relay contact 31 that is a switching device. Connected to line 6. The relay contact 31 is a contact of the relay 32 that is driven by the detection circuit 33. The detection circuit 33 receives the detection signal of the electric field sensor 34, which is a lightning sensor, and drives the relay 32 when the detection signal exceeds a threshold value. The electric field sensor 34, the detection circuit 33, and the relay 32 constitute a control device that controls opening and closing of the relay contact 31. The detection circuit 33 of the control device is configured to be Hi output when no lightning is detected, and Lo output when lightning is detected. Therefore, the relay 32 opens the relay contact 31 with the Hi output of the detection circuit 33, The relay contact 31 is closed by the Lo output of the detection circuit 33.

本発明に係る鉄道信号用保安器は上述の如く構成されているので、雷雲３５が接近していないときには、第１の信号用保安器１０と第２の信号用保安器２０のいずれも接地線６から切り離されている。このため、地絡事故が発生しても、地絡事故による連続的な異常電流が接地線６を介して第１の信号用保安器１０と第２の信号用保安器２０に印加されることはない。従って、鉄道信号機器１が設置された近くで地絡事故が発生しても、第１の信号用保安器１０、第２の信号用保安器２０、及び鉄道信号機器１が焼損する事故を予防することができる。 Since the railway signal protector according to the present invention is configured as described above, when the thundercloud 35 is not approaching, both the first signal protector 10 and the second signal protector 20 are grounded. Separated from 6. For this reason, even if a ground fault occurs, a continuous abnormal current due to the ground fault is applied to the first signal protector 10 and the second signal protector 20 via the ground line 6. There is no. Therefore, even if a ground fault occurs near the railway signal device 1 installed, the first signal protector 10, the second signal protector 20, and the railroad signal device 1 are prevented from being burned out. can do.

もし、雷雲３５が接近したときには、電界センサ３４は雷の接近を知らせる検知信号を発生する。すると、検知回路３３は当該検知信号が閾値を超えたときにリレー３２を駆動してリレー接点３１を閉じる。これによって、第１の信号用保安器１０の三極アレスタ１１と第２の信号用保安器２０の三極アレスタ２１の接地極は接地される。従って、雷雲３５が接近したときには、本発明に係る鉄道信号用保安器は、雷害対策として機能する。 If the thundercloud 35 approaches, the electric field sensor 34 generates a detection signal that informs the approach of thunder. Then, the detection circuit 33 drives the relay 32 and closes the relay contact 31 when the detection signal exceeds a threshold value. As a result, the three-pole arrester 11 of the first signal protector 10 and the ground pole of the three-pole arrester 21 of the second signal protector 20 are grounded. Therefore, when the thundercloud 35 approaches, the railway signal protector according to the present invention functions as a countermeasure against lightning damage.

要するに、本発明に係る鉄道信号用保安器は、雷が接近していないときには開閉装置であるリレー接点３１でオフにして地絡事故による異常電流が第１の信号用保安器１０と第２の信号用保安器２０並びに鉄道信号機器１に流入するルートを開放し、地絡事故対策と雷害対策を確保し、雷が接近したときには開閉装置であるリレー接点３１をオンにして第１の信号用保安器１０と第２の信号用保安器２０の接地極を接地線に接続し、雷害対策を確保するものである。 In short, the railroad signal protector according to the present invention is turned off at the relay contact 31 that is a switchgear when lightning is not approaching, and abnormal current due to a ground fault is caused by the first signal protector 10 and the second signal protector 10. The route that flows into the signal protector 20 and the railroad signal device 1 is opened, the ground fault accident countermeasure and the lightning damage countermeasure are secured, and when the lightning approaches, the relay contact 31 that is a switching device is turned on to turn on the first signal. The grounding poles of the safety protector 10 and the second signal protector 20 are connected to a grounding wire to ensure lightning damage countermeasures.

なお、制御装置の検知回路３３は、雷を検知しないときにはHi出力、雷を検知したときにはLo出力となるように構成されているが、更に検知回路故障時にはLo出力となるように構成されている。これは、地絡事故対策よりも信号用保安器による雷害対策が優先するからである。 The detection circuit 33 of the control device is configured to output Hi when no lightning is detected, and output Lo when lightning is detected, but is further configured to output Lo when the detection circuit fails. . This is because lightning damage countermeasures using signal protectors have priority over ground fault accident countermeasures.

本発明に係る鉄道信号用保安器を構成する雷センサとしては、例えば特許文献１に記載されている静電界検知方式（電界センサ）や誘導検知方式（磁界センサ）やこれらの方式を組み合わせたもののいずれも利用可能である。 As a lightning sensor constituting the railroad signal protector according to the present invention, for example, an electrostatic field detection method (electric field sensor) or an induction detection method (magnetic field sensor) described in Patent Document 1 or a combination of these methods. Either can be used.

以上、一対の入力側信号線と一対の出力側信号線を有する鉄道信号機器の入力側と出力側に信号用保安器を備えた鉄道信号用保安器に本発明を適用した実施例を詳細に説明したが、本発明は特許請求の範囲で様々な実施態様が可能である。即ち、前記鉄道信号機器の入力側のみに信号用保安器を備えた鉄道信号用保安器と前記鉄道信号機器の出力側のみに信号用保安器を備えた鉄道信号用保安器のいずれにも本発明は適用できる。 As described above, the embodiment in which the present invention is applied in detail to a railway signal protector provided with a signal protector on the input side and output side of a railway signal device having a pair of input side signal lines and a pair of output side signal lines. Although described, the invention is capable of various embodiments within the scope of the claims. That is, both the railway signal protector provided with the signal protector only on the input side of the railway signal device and the railway signal protector provided with the signal protector only on the output side of the railway signal device. The invention is applicable.

また、一対の電源線と一対の信号線を有する鉄道信号機器の電源線側と信号線側のそれぞれに信号用保安器を備えた鉄道信号用保安器、前記鉄道信号機器の電源線側のみに信号用保安器を備えた鉄道信号用保安器、前記鉄道信号機器の信号線側のみに信号用保安器を備えた鉄道信号用保安器のいずれにも本発明は適用できる。 Also, a railway signal protector having a signal protector on each of the power line side and the signal line side of the railway signal equipment having a pair of power lines and a pair of signal lines, only on the power line side of the railway signal equipment The present invention can be applied to both a railway signal protector provided with a signal protector and a railway signal protector provided with a signal protector only on the signal line side of the railway signal device.

なお、本発明に係る鉄道信号用保安器に用いられる信号用保安器は三極アレスタを含む信号用保安器であればよく、図１や図２に示す如き三極アレスタと一対のバリスタで構成されたものに限定されるものではない。因みに、非特許文献１には本発明に係る鉄道信号用保安器に用いることができる各種の信号用保安器が記載されている。 The signal protector used in the railway signal protector according to the present invention may be a signal protector including a three-pole arrester, and is composed of a three-pole arrester and a pair of varistors as shown in FIGS. It is not limited to what was done. Incidentally, Non-Patent Document 1 describes various signal protectors that can be used in the railway signal protector according to the present invention.

１ 鉄道信号機器
２，３ 入力側信号線
４，５ 出力側信号線
６ 接地線
１０ 第１の信号用保安器
１１ 三極アレスタ
１２，１３ バリスタ
１４ 接地極線
２０ 第２の信号用保安器
２１ 三極アレスタ
２２，２３ バリスタ
２４ 接地極線
３１ リレー接点
３２ リレー
３３ 検知回路
３４ 電界センサ
３５ 雷雲




















DESCRIPTION OF SYMBOLS 1 Railroad signal apparatus 2,3 Input side signal line 4,5 Output side signal line 6 Ground line 10 First signal protector 11 Three pole arrester 12, 13 Varistor 14 Ground pole line 20 Second signal protector 21 Three-pole arrester 22, 23 Varistor 24 Grounding electrode 31 Relay contact 32 Relay 33 Detection circuit 34 Electric field sensor 35 Thundercloud




















Claims (6)

一対の電極がそれぞれバリスタを介して鉄道信号機器の一対の電源線又は信号線に接続された三極アレスタを含む信号用保安器と、前記三極アレスタの接地極と接地線との間に接続された開閉装置と、雷が接近していないときには前記三極アレスタの接地極を前記接地線から開放し且つ雷が接近したときには前記三極アレスタの接地極を前記接地線に接続するように前記開閉装置を制御する制御装置とで構成された鉄道信号用保安器。 A pair of electrodes are connected between a grounding pole and a grounding wire of the three-pole arrester, and a signal protector including a three-pole arrester connected to a pair of power lines or signal lines of a railway signal device through a varistor. When the lightning is not approaching, the grounding pole of the three-pole arrester is opened from the grounding line, and when the lightning is approaching, the grounding pole of the three-pole arrester is connected to the grounding line. A railway signal protector composed of a control device for controlling a switchgear. 前記開閉装置は前記三極アレスタの接地極と接地線との間にリレー接点が接続されたリレー装置であることを特徴とする請求項１に記載の鉄道信号用保安器。 The railroad signal protector according to claim 1, wherein the switchgear is a relay device in which a relay contact is connected between a ground electrode and a ground wire of the three-pole arrester. 前記制御装置は雷センサを備えることを特徴とする請求項１に記載の鉄道信号用保安器。 The railroad signal protector according to claim 1, wherein the control device includes a lightning sensor. 前記雷センサは電界センサであることを特徴とする請求項３に記載の鉄道信号用保安器。 4. The railway signal protector according to claim 3, wherein the lightning sensor is an electric field sensor. 前記雷センサは磁界センサであることを特徴とする請求項３に記載の鉄道信号用保安器。 4. The railway signal protector according to claim 3, wherein the lightning sensor is a magnetic field sensor. 前記制御装置が故障した場合には、前記開閉装置は閉じて前記三極アレスタの接地極と接地線を接続するように構成されていることを特徴とする請求項１に記載の鉄道信号用保安器。

























The railroad signal security according to claim 1, wherein when the control device fails, the switchgear is closed to connect the ground electrode of the three-pole arrester and the ground wire. vessel.

























JP2009206711A 2009-09-08 2009-09-08 Railway signal protector Expired - Fee Related JP5289248B2 (en)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
JP2016096371A (en) * 2014-11-12 2016-05-26 アズビル株式会社 Noise detection circuit
CN111243239A (en) * 2020-01-16 2020-06-05 河北华宇天地通信技术有限公司 Natural disaster risk monitoring device based on satellite remote sensing image
WO2022176138A1 (en) * 2021-02-19 2022-08-25 三菱電機株式会社 Lightning strike determination control device, power supply system, and lightning strike determination control method

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JPH0292901U (en) * 1989-01-12 1990-07-24
JPH09184890A (en) * 1995-12-28 1997-07-15 Akira Togashi Lightning sensor and lightning countermeasuring apparatus
JPH1118285A (en) * 1997-06-23 1999-01-22 Nec Home Electron Ltd Protector against lightning surge
JP2003165440A (en) * 2001-11-29 2003-06-10 Daido Signal Co Ltd Protector for controlling grade crossing
JP2004096958A (en) * 2002-09-03 2004-03-25 Nippon Kouatsu Electric Co Thunder resistant system

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Publication number Priority date Publication date Assignee Title
JPH0292901U (en) * 1989-01-12 1990-07-24
JPH09184890A (en) * 1995-12-28 1997-07-15 Akira Togashi Lightning sensor and lightning countermeasuring apparatus
JPH1118285A (en) * 1997-06-23 1999-01-22 Nec Home Electron Ltd Protector against lightning surge
JP2003165440A (en) * 2001-11-29 2003-06-10 Daido Signal Co Ltd Protector for controlling grade crossing
JP2004096958A (en) * 2002-09-03 2004-03-25 Nippon Kouatsu Electric Co Thunder resistant system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016096371A (en) * 2014-11-12 2016-05-26 アズビル株式会社 Noise detection circuit
CN111243239A (en) * 2020-01-16 2020-06-05 河北华宇天地通信技术有限公司 Natural disaster risk monitoring device based on satellite remote sensing image
WO2022176138A1 (en) * 2021-02-19 2022-08-25 三菱電機株式会社 Lightning strike determination control device, power supply system, and lightning strike determination control method
JP7204999B1 (en) * 2021-02-19 2023-01-16 三菱電機株式会社 Lightning Strike Determination Control Device, Power Supply System, and Lightning Strike Determination Control Method

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