JP2017154513A - Track short circuit device - Google Patents

Track short circuit device Download PDF

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JP2017154513A
JP2017154513A JP2016036738A JP2016036738A JP2017154513A JP 2017154513 A JP2017154513 A JP 2017154513A JP 2016036738 A JP2016036738 A JP 2016036738A JP 2016036738 A JP2016036738 A JP 2016036738A JP 2017154513 A JP2017154513 A JP 2017154513A
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frequency
track
circuit
current
track circuit
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JP6635827B2 (en
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雄一 大貫
Yuichi Onuki
雄一 大貫
栄治 岡部
Eiji Okabe
栄治 岡部
和実 岩瀬
Kazumi Iwase
和実 岩瀬
直樹 飯山
Naoki Iiyama
直樹 飯山
中田 博之
Hiroyuki Nakada
博之 中田
隆 船山
Takashi Funayama
隆 船山
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East Japan Railway Co
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East Japan Railway Co
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Abstract

PROBLEM TO BE SOLVED: To provide a track short circuit device capable of making a track circuit detect on-rail without operating a railroad crossing even in a rail track in which a non-insulated type track circuit is installed and the frequency of the track circuit is set close to the frequency band of the railroad crossing control signal.SOLUTION: The track short circuit device is provided in a pair of electrodes (27) connected electrically to a pair of rails respectively, and in a signal path (L1) connecting the pair of electrodes and comprises a frequency filter (19) for passing a signal of a passing frequency and reducing the passage of signals of other frequencies, a current sensor (3) for detecting the current flowing through a rail coming close at least one rail of the pair of rails, a current frequency measuring part (11) for measuring the frequency component of the current detected by the current sensor (3), and a control part (13) for setting the passing frequency of the frequency filter based on the measurement result of the current frequency measurement.SELECTED DRAWING: Figure 2

Description

本発明は、線路周辺で工事を行う場合などに、レール間を短絡して軌道回路に列車が在線しているように検知させる軌道短絡装置に関する。   The present invention relates to a track short-circuit device that detects when a train is present in a track circuit by short-circuiting between rails when performing construction around a track.

以前より、鉄道の線路には、列車が在線していることを検知する軌道回路が設けられている。軌道回路は、一対のレールを信号経路として所定周波数の電気信号を送信する送信機と、この電気信号を一対のレールを介して受信する受信機とを備えている。信号経路であるレール間に列車が進入し、車輪を介してレール間が短絡することで、受信機の受信信号のレベルが低下して、列車の在線を検知できる。線路には複数の軌道回路が所定区間ごとに設けられており、何れの軌道回路が在線を検知するかによって、列車の在線区間が認識される。在線の検知によって信号保安システムの制御が行われ、例えば信号が赤に切り替わる。   Traditionally, railroad tracks have been provided with track circuits that detect when a train is present. The track circuit includes a transmitter that transmits an electrical signal having a predetermined frequency using a pair of rails as signal paths, and a receiver that receives the electrical signal via the pair of rails. When the train enters between the rails that are signal paths and the rails are short-circuited via the wheels, the level of the reception signal of the receiver is lowered, and the presence of the train can be detected. The track is provided with a plurality of track circuits for each predetermined section, and the track section of the train is recognized depending on which track circuit detects the track. The signal security system is controlled by detecting the presence line, for example, the signal is switched to red.

軌道回路には、隣接する別の軌道回路と互いに絶縁される絶縁形の軌道回路と、互いに絶縁されない無絶縁形の軌道回路とがある。絶縁形の軌道回路では、隣接する複数の軌道回路で同じ周波数の信号を使用することができるが、軌道回路の境界をレールの継ぎ目の箇所に設定し、レールの繋ぎ目に絶縁物を挟む必要がある。一方、無絶縁形の軌道回路では、軌道回路の境界をレールの継ぎ目の箇所に設定する必要はなく、レールの継ぎ目に絶縁物を挟む必要もない。無絶縁形の軌道回路では、隣接する二つの軌道回路間で異なる周波数の信号を使用することで、二つの軌道回路間で信号が混線することを回避している。   The track circuit includes an insulated track circuit that is insulated from another adjacent track circuit and a non-insulated track circuit that is not insulated from each other. In an isolated track circuit, multiple adjacent track circuits can use the same frequency signal, but the track circuit boundary must be set at the rail joint and an insulator must be sandwiched between the rail joints. There is. On the other hand, in the non-insulated track circuit, it is not necessary to set the boundary of the track circuit at the rail joint, and it is not necessary to sandwich an insulator between the rail joints. In the non-insulated track circuit, signals having different frequencies are used between two adjacent track circuits, thereby preventing signals from being mixed between the two track circuits.

従来、線路周辺で工事を行う場合などに、レール間を短絡する軌道短絡器が利用される(例えば特許文献1を参照)。レール間の短絡により、列車が存在しなくても軌道回路が列車の在線を検知して信号機が赤に切り替えられるなど、工事箇所の安全を確保できる。
一方、レールには、踏切制御に使用される信号が流れていることがある。軌道短絡装置が、踏切制御の信号も通してしまうと、工事中に踏切が動作してしまう。このため、一般的な軌道短絡装置には、踏切制御の高帯域の信号を通さずに、軌道回路の低帯域の信号のみを通すフィルタ機能が設けられる。
2. Description of the Related Art Conventionally, a track short circuit that short-circuits between rails is used when performing construction around a track (see, for example, Patent Document 1). Due to the short circuit between the rails, even if there is no train, the track circuit detects the train's presence line and the traffic light is switched to red so that the safety of the construction site can be ensured.
On the other hand, a signal used for crossing control may flow through the rail. If the track short-circuit device also passes a signal for level crossing control, the level crossing operates during construction. For this reason, a general track short-circuiting device is provided with a filter function that passes only the low-band signal of the track circuit without passing the high-band signal of the level crossing control.

特開平8−26111号公報JP-A-8-26111

無絶縁形の軌道回路は、互いの信号の周波数を異ならせて、隣接する二つの軌道回路間の混線を回避するため、信号の周波数は比較的に高帯域に設定される。現在、このように高帯域の信号を用いた無絶縁形の軌道回路に対応する軌道短絡器は無く、工事などで無絶縁形の軌道回路を短絡させたくても、使用できる軌道短絡器が無いのが実情である。   In the non-insulated track circuit, the frequency of the signal is set to a relatively high band in order to avoid crosstalk between two adjacent track circuits by making the frequency of the signals different from each other. Currently, there is no track short circuit that supports non-insulated track circuits that use high-band signals in this way, and there is no track short circuit that can be used even if you want to short-circuit non-insulated track circuits during construction. Is the actual situation.

一方、従来の軌道短絡器と同じような構造で、高帯域の信号に対応させようとすると、次に示すような幾つかの問題が発生する。先ず、ローパスフィルタの通過帯域幅を広げて高帯域の信号も通るようにすると、踏切の信号も通して踏切を動作させる軌道短絡器となってしまう。踏切を動作させないで高帯域の軌道回路の信号のみを通すようにするには、通過帯域幅の狭い急峻なフィルタが必要になる。急峻なフィルタだと、一つのフィルタで短絡できる軌道回路の周波数が限定されてしまうため、短絡したい軌道回路の信号がどの周波数かを正確に把握する必要が生じる。無絶縁形の軌道回路には多くの周波数が割り当てられ、各々の軌道回路はこれら多くの周波数の中から何れかを使用している。このため、全ての無絶縁形の軌道回路に対応するには、多くのフィルタが必要になる。人がフィルタを選択して短絡すると、フィルタの選択誤りが発生する可能性が生じるとともに、多くのフィルタを持ち運ぶ必要が生じる。   On the other hand, when trying to cope with a high-band signal with the same structure as that of a conventional track short circuit, the following problems occur. First, if the pass band width of the low-pass filter is widened to allow a high-bandwidth signal to pass through, a track short circuit that operates the railroad crossing also through the crossing signal is obtained. In order to pass only the signal of the high-band track circuit without operating the level crossing, a steep filter with a narrow pass bandwidth is required. If a steep filter is used, the frequency of the track circuit that can be short-circuited by a single filter is limited. Therefore, it is necessary to accurately grasp the frequency of the signal of the track circuit that is desired to be short-circuited. Many frequencies are assigned to the non-insulated track circuit, and each track circuit uses one of these many frequencies. For this reason, many filters are required to support all non-insulated track circuits. When a person selects a filter and short-circuits it, a filter selection error may occur, and many filters need to be carried.

このような問題を解消し、無絶縁形の軌道回路であっても踏切を動作させずに確実に軌道回路のみを短絡させるには、軌道回路の周波数を自動で検出し、検出結果に応じて自動でフィルタを切り替える機能が求められる。軌道回路の周波数は、一対のレール間の電圧に表れるため、この電圧から周波数を検出して、これに対応するフィルタを選択すればよいと考えられる。   In order to solve such problems and ensure that only the track circuit is short-circuited without operating the railroad crossing even in the case of a non-insulated track circuit, the frequency of the track circuit is automatically detected and the detection result is A function to automatically switch filters is required. Since the frequency of the track circuit appears in the voltage between the pair of rails, it is considered that the frequency is detected from this voltage and a filter corresponding to this is selected.

しかしながら、レール間の電圧から周波数を検出してフィルタを選択したのでは、無絶縁形の軌道回路において、例えば隣接する軌道回路の周波数が検出されて、フィルタが適切に選択されない場合があるという問題が生じた。以下では、軌道短絡器が設置される軌道回路を「設置区間の軌道回路」と呼び、これに隣接する軌道回路を「隣接区間の軌道回路」と呼ぶ。上記のようにフィルタが適切に選択されないと、軌道短絡器は設置区間の軌道回路の信号を余り通すことができず、設置区間の軌道回路に在線と検知させることができない。さらに、この軌道短絡器は、隣接区間の軌道回路の信号を通しても、隣接区間の外に設置されているため、通過する信号量は多くならず、隣接区間の軌道回路にも在線と検知させることができない。   However, when the filter is selected by detecting the frequency from the voltage between the rails, there is a problem that in the non-insulated track circuit, for example, the frequency of the adjacent track circuit is detected and the filter may not be selected properly. Occurred. Hereinafter, the track circuit in which the track short circuit is installed is referred to as “track circuit in the installation section”, and the track circuit adjacent thereto is referred to as “track circuit in the adjacent section”. If the filter is not properly selected as described above, the track short circuit cannot pass the signal of the track circuit in the installation section so much, and the track circuit in the installation section cannot be detected as an existing line. Furthermore, since this track short circuit is installed outside the adjacent section even through the signal of the track circuit in the adjacent section, the amount of signal passing through does not increase, and the track circuit in the adjacent section is also detected as a current line. I can't.

本発明は、軌道回路の信号の周波数が踏切制御の信号の周波数帯に近く、無絶縁形の軌道回路が設けられた線路においても、踏切を動作させずに軌道回路に確実に在線を検知させることのできる軌道短絡装置を提供することを目的としている。   The present invention enables the track circuit to reliably detect the presence line without operating the railroad crossing even in a track where the frequency of the track circuit signal is close to the frequency band of the level crossing control signal and the non-insulated track circuit is provided. An object of the present invention is to provide an orbital short-circuit device that can perform such a process.

本発明者らが調査したところ、無絶縁形の軌道回路では、軌道回路の境界周辺において、この軌道回路の信号電圧よりも、隣接する軌道回路の信号電圧の方が大きくなる場合があると判明した(図6(b)の地点P1を参照)。一方、図6(c)に示すように、軌道回路の電流に注目したところ、一つの軌道回路の周波数成分よりも、隣接する軌道回路の周波数成分が大きくなることがないと判明した。   As a result of investigations by the present inventors, it has been found that in the non-insulated track circuit, the signal voltage of the adjacent track circuit may be larger than the signal voltage of the track circuit around the boundary of the track circuit. (See point P1 in FIG. 6B). On the other hand, as shown in FIG. 6C, when attention is paid to the current of the track circuit, it has been found that the frequency component of the adjacent track circuit does not become larger than the frequency component of one track circuit.

上記知見に基づき、本発明に係る軌道短絡装置は、
一対のレールにそれぞれ電気的に接続される一対の電極と、
前記一対の電極を結ぶ信号経路に設けられ、設定された通過周波数の信号を通し、他の周波数の信号の通過を低減する周波数フィルタと、
前記一対のレールのうち少なくとも一つのレールに近接されて前記一つのレールに流れる電流を検出する電流センサと、
前記電流センサにより検出された電流の周波数成分を計測する電流周波数計測部と、
前記電流周波数計測部の計測結果に基づいて前記周波数フィルタの前記通過周波数を設定する制御部と、
を備えることを特徴とする構成とした。
Based on the above knowledge, the orbital short-circuit device according to the present invention is:
A pair of electrodes each electrically connected to a pair of rails;
A frequency filter that is provided in a signal path connecting the pair of electrodes, passes a signal of a set passing frequency, and reduces the passage of a signal of another frequency;
A current sensor for detecting a current flowing in the one rail in proximity to at least one of the pair of rails;
A current frequency measuring unit for measuring a frequency component of the current detected by the current sensor;
A control unit for setting the pass frequency of the frequency filter based on the measurement result of the current frequency measurement unit;
It was set as the structure characterized by providing.

このような構成によれば、無絶縁形の軌道回路であっても、レールに流れる電流の周波数成分を計測することで、設置区間の軌道回路の周波数を、隣接区間の軌道回路の周波数と間違うことなく判定できる。これにより、周波数フィルタの通過帯域を正しく設定して、設置区間の軌道回路に在線を検知させることができる。   According to such a configuration, even in an uninsulated track circuit, the frequency component of the current flowing in the rail is measured, so that the frequency of the track circuit in the installation section is mistaken for the frequency of the track circuit in the adjacent section. It can be judged without. Thereby, the pass band of a frequency filter can be set correctly, and a track can be detected by the track circuit of an installation area.

ここで、本発明に係る軌道短絡装置は、前記一対のレール間の電圧の周波数成分を解析する電圧周波数解析部をさらに備え、
前記周波数フィルタは、前記通過周波数より低域および広域の周波数の信号の通過を低減する帯域フィルタであり、複数種類の軌道回路の周波数に対応する複数の通過周波数に切り替え可能であり、
前記制御部は、前記電圧周波数解析部の解析結果と前記電流周波数計測部の計測結果とに基づき、前記一対の電極が接続される設置区間の軌道回路の周波数を判定して、前記周波数フィルタの前記通過周波数を選択するように構成するとよい。
Here, the track short-circuit apparatus according to the present invention further includes a voltage frequency analysis unit that analyzes a frequency component of the voltage between the pair of rails,
The frequency filter is a bandpass filter that reduces the passage of signals in a frequency range lower and wider than the pass frequency, and can be switched to a plurality of pass frequencies corresponding to frequencies of a plurality of types of track circuits,
The control unit determines the frequency of the track circuit in the installation section to which the pair of electrodes are connected based on the analysis result of the voltage frequency analysis unit and the measurement result of the current frequency measurement unit, and It may be configured to select the pass frequency.

この構成によれば、比較的に急峻な帯域フィルタを利用することで、軌道回路の周波数帯が踏切制御の周波数帯の近くにある場合でも、踏切制御の周波数を避け、且つ軌道回路の周波数の信号の通すように周波数フィルタの通過特性を設定しやすい。また、制御部は、設置区間の軌道回路の周波数を判定して、複数の通過周波数の中から1つの通過周波数を選択するので、フィルタを選択するために利用者の煩雑な処理が必要ない。   According to this configuration, by using a relatively steep band filter, even when the frequency band of the track circuit is close to the frequency band of the level crossing control, the frequency of the level crossing control is avoided and the frequency of the track circuit is reduced. It is easy to set the pass characteristics of the frequency filter so that the signal can pass. Further, since the control unit determines the frequency of the track circuit in the installation section and selects one pass frequency from among a plurality of pass frequencies, no complicated process for the user is required to select a filter.

さらに、前記制御部には、無絶縁形の軌道回路で使用される周波数と絶縁形の軌道回路で使用される周波数とが記憶され、
前記制御部は、前記一対のレール間の電圧に無絶縁形の軌道回路の周波数成分が計測されることを条件に、前記電流周波数計測部の計測結果と前記電圧周波数解析部の解析結果とを用いて、前記設置区間の軌道回路の周波数を判定するように構成するとよい。
レールに流れる電流の検出精度は、レール間の電圧の検出精度よりも低くなりやすいところ、上記構成によれば、先ず、電圧から無絶縁形の軌道回路が対象であるか判別し、その場合に、電流周波数計測の計測結果を用いて周波数が判定される。よって、総合的に信頼の高い周波数の判定を行うことができる。
Further, the control unit stores a frequency used in the non-insulated track circuit and a frequency used in the insulated track circuit,
The control unit obtains the measurement result of the current frequency measurement unit and the analysis result of the voltage frequency analysis unit on the condition that the frequency component of the non-insulated track circuit is measured in the voltage between the pair of rails. It may be configured to use and determine the frequency of the track circuit in the installation section.
The detection accuracy of the current flowing in the rail tends to be lower than the detection accuracy of the voltage between the rails. According to the above configuration, first, it is determined whether the non-insulated track circuit is the target from the voltage, and in that case The frequency is determined using the measurement result of the current frequency measurement. Therefore, it is possible to make a comprehensively reliable frequency determination.

また、前記制御部は、
前記一対のレール間の電圧に無絶縁形の軌道回路の複数の周波数成分が検出された場合に、検出された前記複数の周波数成分の中から電圧の高い順に2つの周波数成分を抽出し、抽出された前記2つの周波数成分の電流の大小に基づいて前記設置区間の軌道回路の周波数を判定するように構成するとよい。
この構成によれば、電圧から周波数を絞った上で、電流の周波数成分を比較して設置区間の軌道回路の周波数を判定するので、信頼のより高い周波数の判定を行うことができる。
In addition, the control unit
When a plurality of frequency components of the non-insulated track circuit are detected in the voltage between the pair of rails, two frequency components are extracted from the detected plurality of frequency components in descending order of voltage. The frequency of the track circuit in the installation section may be determined based on the magnitude of the current of the two frequency components.
According to this configuration, after the frequency is narrowed down from the voltage, the frequency components of the current are compared and the frequency of the track circuit in the installation section is determined, so that a more reliable frequency determination can be performed.

本発明によれば、軌道回路の信号の周波数が踏切制御の信号の周波数帯に近く、無絶縁形の軌道回路が設けられた線路においても、踏切を動作させずに軌道回路に在線を検知させることができるという効果が得られる。   According to the present invention, even when the frequency of the track circuit signal is close to the frequency band of the level crossing control signal and the non-insulated track circuit is provided, the track circuit is made to detect the presence line without operating the level crossing. The effect that it can be obtained.

本発明の実施の形態の軌道短絡装置を示す構成図である。It is a lineblock diagram showing the track short circuit device of an embodiment of the invention. 実施の形態の軌道短絡装置の内部構成を示すブロック図である。It is a block diagram which shows the internal structure of the track | orbit short circuit apparatus of embodiment. 周波数フィルタの一例を示す回路図である。It is a circuit diagram which shows an example of a frequency filter. 周波数フィルタの通過特性の一例を示す特性図である。It is a characteristic view which shows an example of the pass characteristic of a frequency filter. 実施の形態のCPUが実行する通過周波数決定処理の手順を示すフローチャートである。It is a flowchart which shows the procedure of the pass frequency determination process which CPU of embodiment performs. 無絶縁形の軌道回路の特性を説明する図である。It is a figure explaining the characteristic of a non-insulated track circuit.

以下、本発明の実施の形態について図面を参照して詳細に説明する。
図1は、本発明の実施の形態の軌道短絡装置を示す構成図である。図2は、実施の形態の軌道短絡装置の内部構成を示すブロック図である。
本実施の形態の軌道短絡装置は、図1に示すように、短絡器本体1と、一対のレールR、Rに取り付けられる一対のレール接続子2、2と、電流センサ3とを備えている。短絡器本体1と、一対のレール接続子2、2および電流センサ3とは、ケーブル4、5をそれぞれ介して接続されている。
レール接続子2は、図2に示すように、電極27、28を有し、レールRに取り付けられた場合に、電極27、28がレールRに電気的に接続される。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram showing a track short-circuit apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating an internal configuration of the track short-circuit apparatus according to the embodiment.
As shown in FIG. 1, the track short-circuit apparatus according to the present embodiment includes a short-circuit main body 1, a pair of rails R and a pair of rail connectors 2 and 2 attached to the R, and a current sensor 3. . The short-circuit main body 1, the pair of rail connectors 2, 2 and the current sensor 3 are connected via cables 4 and 5, respectively.
As shown in FIG. 2, the rail connector 2 has electrodes 27 and 28. When the rail connector 2 is attached to the rail R, the electrodes 27 and 28 are electrically connected to the rail R.

電流センサ3は、例えば、コイルを内蔵し、レールRの一区画の上部を覆うように設置される。レールRに流れる電流により電流センサ3のコイルに誘導起電力が生じ、この起電力からレールRの電流を検出できる。
短絡器本体1は、マイクロコンピュータなどの制御回路10と、表示器21およびブザー22などの通知手段と、一対の電極27、27間を結ぶ信号線L1に設けられる電流センサ18、周波数フィルタ19、および開閉器20と、電池24および電源スイッチ23などを備えている。
レール接続子2の2つの電極27、28のうち、一方の電極27は、短絡動作時に信号線L1に軌道回路の電流を流すものである。他方の電極28は、レールR、R間の電圧を電流による電圧降下の影響なく計測するためのものである。
The current sensor 3 includes, for example, a coil and is installed so as to cover the upper part of one section of the rail R. An induced electromotive force is generated in the coil of the current sensor 3 due to the current flowing in the rail R, and the current in the rail R can be detected from the electromotive force.
The short-circuit main body 1 includes a control circuit 10 such as a microcomputer, notification means such as a display 21 and a buzzer 22, and a current sensor 18 provided on a signal line L1 connecting the pair of electrodes 27 and 27, a frequency filter 19, And a switch 20, a battery 24, a power switch 23, and the like.
Of the two electrodes 27 and 28 of the rail connector 2, one of the electrodes 27 allows a current of the track circuit to flow through the signal line L1 during a short circuit operation. The other electrode 28 is for measuring the voltage between the rails R and R without being affected by a voltage drop due to current.

電流センサ18は、短絡動作が正常に行われているか監視するために、信号線L1に流れる電流を計測する。電流センサ18の検出信号は制御回路10へ送られる。
開閉器20は、制御部13により制御され、開閉して短絡動作と短絡停止とに装置の状態を切り替える。
表示器21は、装置の状態を表示したり、短絡電流、レール間電圧、選択周波数などを表示したりする。また、表示器21は、LEDなどの発光部を含み、発光状態によって短絡動作の正常又は異常を表示するようにしてもよい。
ブザー22は、例えば短絡動作中にレール接続子2がレールRから外れるなどして、短絡動作に異常が発生した場合に、ブザー音を発生させて、使用者に異常を報知する。
The current sensor 18 measures the current flowing through the signal line L1 in order to monitor whether the short circuit operation is normally performed. The detection signal of the current sensor 18 is sent to the control circuit 10.
The switch 20 is controlled by the control unit 13 and is opened and closed to switch the state of the apparatus between a short circuit operation and a short circuit stop.
The display 21 displays the state of the device, or displays the short circuit current, the rail voltage, the selected frequency, and the like. The indicator 21 may include a light emitting unit such as an LED, and may display normality or abnormality of the short-circuit operation depending on the light emission state.
The buzzer 22 generates a buzzer sound to notify the user of the abnormality when the abnormality occurs in the short-circuit operation, for example, when the rail connector 2 is detached from the rail R during the short-circuit operation.

制御回路10は、電流周波数計測部11と、電圧周波数解析部12と、制御部13とを有する。制御部13は、制御プログラムを実行して装置を統括的に制御するCPU(中央演算処理装置)14と、CPU14に作業用の記憶領域を提供するメモリ15と、制御データおよび制御プログラムが格納されたROM(Read Only Memory)16と、信号を入出力する入出力部(I/O)17とを有する。
電流周波数計測部11は、電流センサ3により検出されたレールRを流れる電流のうち特定の周波数成分の電流量を計測する。電流周波数計測部11は、フーリエ変換回路などを用いて、検出された電流の周波数成分の解析を行うように構成してもよいし、電流センサ3の出力電圧のうち特定の周波数成分を抽出してこの大きさを計測する構成としてもよい。
The control circuit 10 includes a current frequency measurement unit 11, a voltage frequency analysis unit 12, and a control unit 13. The control unit 13 stores a CPU (central processing unit) 14 that executes a control program to control the apparatus centrally, a memory 15 that provides a working storage area to the CPU 14, control data, and a control program. It has a ROM (Read Only Memory) 16 and an input / output unit (I / O) 17 for inputting and outputting signals.
The current frequency measuring unit 11 measures the current amount of a specific frequency component among the current flowing through the rail R detected by the current sensor 3. The current frequency measurement unit 11 may be configured to analyze the frequency component of the detected current using a Fourier transform circuit or the like, or extract a specific frequency component from the output voltage of the current sensor 3. It is good also as a structure which measures the magnitude | size of a lever.

電圧周波数解析部12は、一対のレール接続子2、2の電極28、28からレール間電圧が入力され、フーリエ変換回路などを用いて周波数成分の解析を行う。
制御部13は、CPU14がROM16に格納された制御プログラムを実行することで、軌道短絡装置の動作を制御する。制御には、始動時に設置区間の軌道回路の周波数を判定して周波数フィルタ19の通過周波数を選択する通過周波数決定処理と、初期設定が完了したら開閉器20を切り替えて短絡動作を開始させる短絡制御処理と、短絡動作中にレール接続子2が外れるなど異常の発生を監視する照査機能処理とが含まれる。このうち、通過周波数決定処理について後に詳述する。
The voltage frequency analysis unit 12 receives a rail-to-rail voltage from the electrodes 28 and 28 of the pair of rail connectors 2 and 2 and analyzes a frequency component using a Fourier transform circuit or the like.
The control unit 13 controls the operation of the track short-circuiting device by the CPU 14 executing a control program stored in the ROM 16. The control includes a pass frequency determination process in which the frequency of the track circuit in the installation section is determined at the start and the pass frequency of the frequency filter 19 is selected, and the short-circuit control in which the switch 20 is switched to start the short-circuit operation when the initial setting is completed. And a verification function process for monitoring the occurrence of an abnormality such as the rail connector 2 being disconnected during a short-circuit operation. Among these, the pass frequency determination processing will be described in detail later.

図3は、周波数フィルタの一例を示す回路図である。図4は、周波数フィルタの通過特性の一例を示す特性図である。
周波数フィルタ19は、信号が通る両端子間に、複数のコイルL1〜L3と、複数のコンデンサC1〜Cnと、これらの接続を切り替えるスイッチ(半導体スイッチ等)31〜33、34−1〜34−nとを有している。スイッチ31〜33、34−1〜34−nは、制御部13により開閉制御される。適宜な組み合わせでスイッチ31〜33、34−1〜34−nが開閉されることで、周波数フィルタ19は、図4に示すように、通過周波数が異なる複数の狭帯域な通過特性に切り替わる。
FIG. 3 is a circuit diagram illustrating an example of a frequency filter. FIG. 4 is a characteristic diagram showing an example of the pass characteristic of the frequency filter.
The frequency filter 19 includes a plurality of coils L1 to L3, a plurality of capacitors C1 to Cn, and switches (semiconductor switches or the like) 31 to 33 and 34-1 to 34 to switch the connection between both terminals through which signals pass. n. The switches 31 to 33 and 34-1 to 34-n are controlled to be opened and closed by the control unit 13. When the switches 31 to 33 and 34-1 to 34-n are opened and closed in an appropriate combination, the frequency filter 19 is switched to a plurality of narrow band pass characteristics having different pass frequencies as shown in FIG.

図4は、主に、無絶縁形の軌道回路に割り当てられた高域(AF:オーディオ周波数)の周波数帯に対応した複数の通過特性を示している。図4に示す軌道回路の周波数帯は、低域側と広域側とに踏切制御用に割り当てられた周波数が近接しており、各通過特性は、通過周波数より高域および低域の信号の通過を低減する狭帯域な特性(帯域フィルタの特性)となっている。なお、周波数フィルタ19の切り替え可能な通過特性には、図4のものに加えて、絶縁形の軌道回路に割り当てられた低域と中域の複数チャンネルの周波数に対応する複数の通過特性が含まれていてもよい。   FIG. 4 mainly shows a plurality of pass characteristics corresponding to the high frequency band (AF: audio frequency) assigned to the non-insulated track circuit. In the frequency band of the track circuit shown in FIG. 4, frequencies assigned for level crossing control are close to the low frequency side and the wide frequency range, and each pass characteristic has a high frequency and low frequency signal passing through the pass frequency. Narrow band characteristics (band filter characteristics). Note that the switchable pass characteristics of the frequency filter 19 include a plurality of pass characteristics corresponding to the frequencies of a plurality of low and middle frequencies assigned to the insulating track circuit in addition to the one shown in FIG. It may be.

図5は、通過周波数決定処理の手順を示すフローチャートである。
続いて、本実施の形態の軌道短絡装置をレールR、Rに接続した後に、制御部13のCPU14が実行する通過周波数決定処理について説明する。
通過周波数決定処理は、電極28、28への電圧入力に基づいて制御部13が自動的に開始するようにしてもよいし、制御スイッチを設けておき、これを使用者が操作したときに開始するようにしてもよい。
通過周波数決定処理が開始されると、先ず、CPU14は、電圧周波数解析部12に電圧の周波数成分の解析を行うよう指令する(ステップS1)。電圧周波数解析部12はこの解析結果を制御部13へ渡す。
FIG. 5 is a flowchart showing the procedure of the pass frequency determination process.
Next, a pass frequency determination process executed by the CPU 14 of the control unit 13 after connecting the track short-circuit apparatus according to the present embodiment to the rails R and R will be described.
The pass frequency determination processing may be started automatically by the control unit 13 based on voltage input to the electrodes 28, 28, or may be started when a control switch is provided and operated by the user. You may make it do.
When the pass frequency determination process is started, first, the CPU 14 instructs the voltage frequency analysis unit 12 to analyze the frequency component of the voltage (step S1). The voltage frequency analysis unit 12 passes this analysis result to the control unit 13.

解析結果が得られたら、CPU14は、低域又は中域に所定値以上の電圧レベルが有るか判別し(ステップS2)、有れば、検出された周波数から軌道回路が使用している周波数を判定し、これを通過周波数に決定する(ステップS7)。ROM16には、複数種類の軌道回路が使用する複数チャンネルの周波数を示すデータが記憶されており、CPU14はこれを用いて検出された周波数に合致する軌道回路の周波数を判定する。
また、低域又は中域の電圧レベルがなければ、高域に所定値以上の電圧レベルが有るか判別する(ステップS3)。その結果、無ければ、軌道回路の信号が入力されていないと判断できるので、異常終了とする。
When the analysis result is obtained, the CPU 14 determines whether the low level or the middle range has a voltage level equal to or higher than a predetermined value (step S2). If there is, the frequency used by the track circuit is determined from the detected frequency. Judgment is made and this is determined as the pass frequency (step S7). The ROM 16 stores data indicating the frequencies of a plurality of channels used by a plurality of types of track circuits, and the CPU 14 uses this to determine the frequency of the track circuit that matches the detected frequency.
If there is no low or middle voltage level, it is determined whether there is a voltage level higher than a predetermined value in the high frequency (step S3). If there is no result, it can be determined that the signal of the track circuit has not been input, and therefore the process ends abnormally.

一方、高域の電圧レベルが有ったら、その周波数帯が、無絶縁形の軌道回路の周波数帯域か、絶縁形の軌道回路の周波数帯域かを判別する(ステップS4)。ROM16には、無絶縁形の軌道回路の周波数帯域を示すデータ、並びに、絶縁形の軌道回路の周波数帯域を示すデータが予め記憶されており、CPU14は、これらのデータを参照して無絶縁形か絶縁形かを判別する。その結果、無絶縁形でなければ、CPU14は、検出された周波数から軌道回路が使用している周波数を判定し、これを通過周波数として決定する(ステップS7)。   On the other hand, if there is a high voltage level, it is determined whether the frequency band is the frequency band of the non-insulated track circuit or the frequency band of the insulated track circuit (step S4). The ROM 16 preliminarily stores data indicating the frequency band of the non-insulated track circuit and data indicating the frequency band of the isolated track circuit. The CPU 14 refers to these data and stores the data in the non-insulated track circuit. Or insulative type. As a result, if it is not the non-insulated type, the CPU 14 determines the frequency used by the track circuit from the detected frequency and determines this as the passing frequency (step S7).

一方、無絶縁形であれば、CPU14は、無絶縁形の軌道回路の複数チャンネルの周波数のうち、電圧レベルが所定の閾値以上ある周波数を抽出する(ステップS5)。ここで、所定の閾値としては、設置区間の軌道回路の出力として想定される最も小さい電圧レベルを設定すればよい。そして、抽出数に基づいて処理を分岐する(ステップS6)。抽出数がゼロであれば、軌道回路の信号が入力されていないと判断できるので異常終了とし、抽出数が「1」であれば、この周波数に合致する軌道回路の周波数を通過周波数に決定する(ステップS7)。
一方、ステップS6の分岐処理の結果、抽出数が「2以上」であれば、抽出された周波数のうち電圧レベルの高い順に、2つの周波数f1、f2を候補として選択する(ステップS8)。
On the other hand, if it is a non-insulated type, the CPU 14 extracts a frequency having a voltage level equal to or higher than a predetermined threshold from the frequencies of a plurality of channels of the non-insulated track circuit (step S5). Here, as the predetermined threshold value, the smallest voltage level assumed as the output of the track circuit in the installation section may be set. Then, the process branches based on the number of extractions (step S6). If the number of extractions is zero, it can be determined that the signal of the track circuit is not input, so the process ends abnormally. If the number of extractions is “1”, the frequency of the track circuit matching this frequency is determined as the passing frequency. (Step S7).
On the other hand, if the number of extractions is “2 or more” as a result of the branching process in step S6, two frequencies f1 and f2 are selected as candidates from the extracted frequency in descending order of voltage level (step S8).

ここで、無絶縁形の軌道回路の特性について説明する。図6(a)は、2つの無絶縁形の軌道回路が設けられた線路区間を示す。図6(a)の中央より左が周波数Aの信号を使用する第1軌道回路であり、中央より右が周波数Bの信号を使用する第2軌道回路である。受信機103は、第1軌道回路と第2軌道回路とで共有され、2つの周波数A、Bの両方の信号を受信している。図6(b)は一対のレールR、R間の電圧と位置との関係を示し、図6(c)は一つのレールRに流れる電流と位置との関係を示している。図6に示すように、無絶縁形では、第1軌道回路と第2軌道回路との境界の近傍で、互いの周波数の信号が混線する。その結果、第2軌道回路内でも、第1軌道回路の周波数Aの電圧が高く表れるところがある(例えば地点P1の電圧を参照)。一方、送信機101、102が出力する周波数Aの電流と周波数Bの電流は受信機103に流れて、隣接する区間に漏れにくい。このため、第1軌道回路内で隣接する第2軌道回路の周波数Bの電流が大きく検出されることは殆どなく(例えば地点P1の電流を参照)、逆に、第2軌道回路内で隣接する第1軌道回路の周波数Aの電流が大きく検出されることも殆どない。   Here, characteristics of the non-insulated track circuit will be described. FIG. 6A shows a line section in which two non-insulated track circuits are provided. 6A is a first track circuit that uses a signal of frequency A, and the right of the center is a second track circuit that uses a signal of frequency B. The receiver 103 is shared by the first track circuit and the second track circuit, and receives both signals of two frequencies A and B. 6B shows the relationship between the voltage and position between the pair of rails R and R, and FIG. 6C shows the relationship between the current flowing through one rail R and the position. As shown in FIG. 6, in the non-insulated type, signals of mutual frequencies are mixed near the boundary between the first track circuit and the second track circuit. As a result, there are places in the second track circuit where the voltage at the frequency A of the first track circuit appears high (see, for example, the voltage at the point P1). On the other hand, the current of frequency A and the current of frequency B output from the transmitters 101 and 102 flow to the receiver 103 and are unlikely to leak into adjacent sections. For this reason, the current at the frequency B of the second track circuit adjacent in the first track circuit is hardly detected (see, for example, the current at the point P1), and conversely, it is adjacent in the second track circuit. The current at the frequency A of the first track circuit is hardly detected.

このような特性があるため、ステップS8で、無絶縁形の軌道回路の2つの周波数f1、f2の候補を選択したら、次に、CPU14は、2つの周波数f1、f2の電圧レベルVf1、Vf2を比べて、1番大きな電圧レベルVf1が2番目の電圧レベルVf2より、例えば4倍以上など非常に大きな差がないか判別する(ステップS9)。ここで、大きな差とは、隣接する軌道回路から混入された信号では生じえない大きな値に設定される。その結果、大きな差があれば、CPU14は、周波数f1を軌道回路の周波数と判定してこれを通過周波数に決定する(ステップS13)。
一方、電圧レベルVf1、Vf2が近い場合には、設置区間の軌道回路の信号と隣接区間の軌道回路の信号とが混線している場合もあり得る。このため、CPU14は、電流周波数計測部11に1本のレールRに流れる電流の2つの周波数f1、f2の成分を計測するよう指令する(S10)。計測結果はCPU14へ送られる。
Because of such characteristics, if the candidates for the two frequencies f1 and f2 of the non-insulated track circuit are selected in step S8, the CPU 14 next sets the voltage levels Vf1 and Vf2 of the two frequencies f1 and f2. In comparison, it is determined whether the largest voltage level Vf1 is significantly different from the second voltage level Vf2, for example, four times or more (step S9). Here, the large difference is set to a large value that cannot be generated by a signal mixed from an adjacent track circuit. As a result, if there is a large difference, the CPU 14 determines the frequency f1 as the frequency of the track circuit and determines this as the passing frequency (step S13).
On the other hand, when the voltage levels Vf1 and Vf2 are close, the signal of the track circuit in the installation section and the signal of the track circuit in the adjacent section may be mixed. For this reason, the CPU 14 instructs the current frequency measuring unit 11 to measure the components of the two frequencies f1 and f2 of the current flowing through one rail R (S10). The measurement result is sent to the CPU 14.

その結果、2つの周波数f1、f2の電流値If1、If2の両方が低い閾値レベル以下であれば、CPU14は、電流が計測できていないと判断して(ステップS11のNO)、異常終了とする。
一方、何れかが閾値レベル以上であれば(ステップS11のYES)、計測された周波数f1の電流値If1と周波数f2の電流値If2とを比較して(ステップS12)、大きい方の周波数を設置区間の軌道回路の周波数と判定し、これを通過周波数に決定する(ステップS13、S14)。
以上のような通過周波数決定処理により、電圧周波数解析部12による電圧の解析結果と、必要があれば電流周波数計測部11の電流の計測結果とが利用されて、周波数フィルタ19の通過周波数の選択が正しく行われる。
As a result, if both of the current values If1 and If2 of the two frequencies f1 and f2 are below the low threshold level, the CPU 14 determines that the current cannot be measured (NO in step S11), and terminates abnormally. .
On the other hand, if either is above the threshold level (YES in step S11), the measured current value If1 of the frequency f1 is compared with the current value If2 of the frequency f2 (step S12), and the larger frequency is set. It determines with the frequency of the track circuit of an area, and determines this as a passing frequency (step S13, S14).
Through the pass frequency determination process as described above, the voltage analysis result by the voltage frequency analysis unit 12 and the current measurement result of the current frequency measurement unit 11 are used if necessary to select the pass frequency of the frequency filter 19. Is done correctly.

通過周波数が決定されたら、制御部13はスイッチ制御により周波数フィルタ19の通過周波数を切り替え、且つ、開閉器20を閉に切り替える。これにより、信号線L1に接続区間の軌道回路の周波数の信号が流れる。そして、接続区間の軌道回路に、一対のレールR、R間の短絡、すなわち軌道短絡装置の接続区間に列車が在線しているかのように検知させることができる。
短絡状態になったら、制御部13は、正常な短絡電流が流れているか、並びに、レール接続子2、2の接続に異常が生じていないか監視を行い、異常が生じたら発光等の表示又はブザー音出力により異常を知らせる。
When the pass frequency is determined, the control unit 13 switches the pass frequency of the frequency filter 19 by switch control and switches the switch 20 to the closed state. Thereby, the signal of the frequency of the track circuit in the connection section flows through the signal line L1. And it is possible to cause the track circuit in the connection section to detect a short circuit between the pair of rails R and R, that is, as if the train is in the connection section of the track short circuit device.
When a short circuit occurs, the control unit 13 monitors whether a normal short circuit current is flowing and whether there is an abnormality in the connection of the rail connectors 2 and 2. Abnormality is notified by buzzer sound output.

以上のように、この実施の形態の軌道短絡装置によれば、無絶縁形の軌道回路が設けられた線路においても、接続区間の軌道回路の周波数を隣接区間の軌道回路の周波数と間違うことなく、高い信頼性を持って判定することができる。また、周波数フィルタ19は、複数種類の軌道回路の周波数に対応させて予め設定された複数の狭帯域な通過特性の中から特性を切り替え可能に構成されている。そして、制御部13は、軌道回路の周波数の判定結果に基づいて周波数フィルタ19の通過特性を選択する。よって、軌道回路の周波数と踏切制御の周波数帯とが近接していても、踏切制御の信号を避けて、軌道回路の信号のみを通すようにできる。さらに、このような周波数フィルタ19の特性の切り替えが自動的に行われるので、周波数フィルタ19の特性を選択するために利用者の煩雑な処理が必要ない。   As described above, according to the track short-circuit apparatus of this embodiment, the frequency of the track circuit in the connection section is not mistaken for the frequency of the track circuit in the adjacent section even in the track provided with the non-insulated track circuit. Can be determined with high reliability. Further, the frequency filter 19 is configured to be able to switch characteristics from a plurality of narrow band pass characteristics set in advance corresponding to the frequencies of a plurality of types of track circuits. And the control part 13 selects the passage characteristic of the frequency filter 19 based on the determination result of the frequency of a track circuit. Therefore, even if the frequency of the track circuit and the frequency band of the level crossing control are close, it is possible to avoid the level crossing control signal and pass only the signal of the track circuit. Furthermore, since the switching of the characteristics of the frequency filter 19 is automatically performed, no complicated process for the user is required to select the characteristics of the frequency filter 19.

以上、本発明の実施の形態について説明したが、本発明は上記の実施の形態に限られるものではない。例えば、上記実施の形態では、レールR、R間の電圧から無絶縁形の軌道回路の周波数帯の信号が検出されたことを条件に、1本のレールRに流れる電流の周波数成分を計測し、これに基づき軌道回路の周波数の判定を行う構成を例にとって説明した。しかしながら、上記の条件なく、最初から1本のレールRに流れる電流の周波数成分を計測して、電流および電圧の周波数成分の計測結果から軌道回路の周波数を判定してもよいし、電圧の周波数成分の解析を行わずに、電流の周波数成分の計測結果のみから軌道回路の周波数を判定してもよい。その他、実施の形態で示した細部は、発明の趣旨を逸脱しない範囲で適宜変更可能である。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, in the above embodiment, the frequency component of the current flowing in one rail R is measured on the condition that a signal in the frequency band of the non-insulated track circuit is detected from the voltage between the rails R and R. The configuration for determining the frequency of the track circuit based on this is described as an example. However, the frequency component of the current flowing in one rail R may be measured from the beginning without the above conditions, and the frequency of the track circuit may be determined from the measurement result of the current and voltage frequency components. You may determine the frequency of a track circuit only from the measurement result of the frequency component of an electric current, without analyzing a component. In addition, the details shown in the embodiments can be changed as appropriate without departing from the spirit of the invention.

1 短絡器本体
2 レール接続子
3 電流センサ
10 制御回路
11 電流周波数計測部
12 電圧周波数解析部
13 制御部
14 CPU
16 ROM
19 周波数フィルタ
21 表示器
22 ブザー
27、28 電極
DESCRIPTION OF SYMBOLS 1 Short circuit body 2 Rail connector 3 Current sensor 10 Control circuit 11 Current frequency measurement part 12 Voltage frequency analysis part 13 Control part 14 CPU
16 ROM
19 Frequency filter 21 Display 22 Buzzer 27, 28 Electrode

Claims (4)

一対のレールにそれぞれ電気的に接続される一対の電極と、
前記一対の電極を結ぶ信号経路に設けられ、設定された通過周波数の信号を通し、他の周波数の信号の通過を低減する周波数フィルタと、
前記一対のレールのうち少なくとも一つのレールに近接されて前記一つのレールに流れる電流を検出する電流センサと、
前記電流センサにより検出された電流の周波数成分を計測する電流周波数計測部と、
前記電流周波数計測部の計測結果に基づいて前記周波数フィルタの前記通過周波数を設定する制御部と、
を備えていることを特徴とする軌道短絡装置。
A pair of electrodes each electrically connected to a pair of rails;
A frequency filter that is provided in a signal path connecting the pair of electrodes, passes a signal of a set passing frequency, and reduces the passage of a signal of another frequency;
A current sensor for detecting a current flowing in the one rail in proximity to at least one of the pair of rails;
A current frequency measuring unit for measuring a frequency component of the current detected by the current sensor;
A control unit for setting the pass frequency of the frequency filter based on the measurement result of the current frequency measurement unit;
An orbital short-circuit device comprising:
前記一対のレール間の電圧の周波数成分を解析する電圧周波数解析部をさらに備え、
前記周波数フィルタは、前記通過周波数より低域および広域の周波数の信号の通過を低減する帯域フィルタであり、複数種類の軌道回路の周波数に対応する複数の通過周波数に切り替え可能であり、
前記制御部は、前記電圧周波数解析部の解析結果と前記電流周波数計測部の計測結果とに基づき、前記一対の電極が接続される設置区間の軌道回路の周波数を判定して、前記周波数フィルタの前記通過周波数を選択することを特徴とする請求項1記載の軌道短絡装置。
A voltage frequency analysis unit for analyzing a frequency component of the voltage between the pair of rails;
The frequency filter is a bandpass filter that reduces the passage of signals in a frequency range lower and wider than the pass frequency, and can be switched to a plurality of pass frequencies corresponding to frequencies of a plurality of types of track circuits,
The control unit determines the frequency of the track circuit in the installation section to which the pair of electrodes are connected based on the analysis result of the voltage frequency analysis unit and the measurement result of the current frequency measurement unit, and The track short-circuit device according to claim 1, wherein the passing frequency is selected.
前記制御部には、無絶縁形の軌道回路で使用される周波数と絶縁形の軌道回路で使用される周波数とが記憶され、
前記制御部は、前記一対のレール間の電圧に無絶縁形の軌道回路の周波数成分が計測されることを条件に、前記電流周波数計測部の計測結果と前記電圧周波数解析部の解析結果とを用いて、前記設置区間の軌道回路の周波数を判定することを特徴とする請求項2記載の軌道短絡装置。
The control unit stores the frequency used in the non-insulated track circuit and the frequency used in the insulated track circuit,
The control unit obtains the measurement result of the current frequency measurement unit and the analysis result of the voltage frequency analysis unit on the condition that the frequency component of the non-insulated track circuit is measured in the voltage between the pair of rails. The track short-circuit apparatus according to claim 2, wherein the track short-circuit device is used to determine a frequency of the track circuit in the installation section.
前記制御部は、
前記一対のレール間の電圧に無絶縁形の軌道回路の複数の周波数成分が検出された場合に、検出された前記複数の周波数成分の中から電圧の高い順に2つの周波数成分を抽出し、抽出された前記2つの周波数成分の電流の大小に基づいて前記設置区間の軌道回路の周波数を判定することを特徴とする請求項3記載の軌道短絡装置。
The controller is
When a plurality of frequency components of the non-insulated track circuit are detected in the voltage between the pair of rails, two frequency components are extracted from the detected plurality of frequency components in descending order of voltage. 4. The track short circuit device according to claim 3, wherein the frequency of the track circuit in the installation section is determined based on the magnitude of the current of the two frequency components.
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US4373691A (en) * 1979-12-19 1983-02-15 International Standard Electric Corporation Decoupling arrangement for non-insulated AC track circuits in railway systems
JPH0826111A (en) * 1994-07-14 1996-01-30 Railway Technical Res Inst Short-circuiting device for track circuit
JPH10138923A (en) * 1996-11-07 1998-05-26 Kenwood Corp Signal facility checking and measuring device
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JP2005022558A (en) * 2003-07-03 2005-01-27 Hitachi Ltd Automatic train stop system
CN1731697A (en) * 2005-04-29 2006-02-08 上海天源科技发展有限公司 Upper / nether side frequency detecting method for railway frequency shift track circuit transmission signal
JP2007302181A (en) * 2006-05-15 2007-11-22 Kyosan Electric Mfg Co Ltd Non-insulated track circuit
JP2012201348A (en) * 2011-03-28 2012-10-22 East Japan Railway Co Track circuit measuring device and program
JP2015085773A (en) * 2013-10-30 2015-05-07 公益財団法人鉄道総合技術研究所 Non-insulated track circuit apparatus
JP3201749U (en) * 2015-10-14 2015-12-24 日本リーテック株式会社 Track short-circuit resistance device with voltmeter
JP2016015837A (en) * 2014-07-02 2016-01-28 東日本旅客鉄道株式会社 Maintenance vehicle and collision prevention method

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373691A (en) * 1979-12-19 1983-02-15 International Standard Electric Corporation Decoupling arrangement for non-insulated AC track circuits in railway systems
JPH0826111A (en) * 1994-07-14 1996-01-30 Railway Technical Res Inst Short-circuiting device for track circuit
JPH10138923A (en) * 1996-11-07 1998-05-26 Kenwood Corp Signal facility checking and measuring device
JP2004082834A (en) * 2002-08-26 2004-03-18 Nippon Signal Co Ltd:The Train control system
JP2005022558A (en) * 2003-07-03 2005-01-27 Hitachi Ltd Automatic train stop system
CN1731697A (en) * 2005-04-29 2006-02-08 上海天源科技发展有限公司 Upper / nether side frequency detecting method for railway frequency shift track circuit transmission signal
JP2007302181A (en) * 2006-05-15 2007-11-22 Kyosan Electric Mfg Co Ltd Non-insulated track circuit
JP2012201348A (en) * 2011-03-28 2012-10-22 East Japan Railway Co Track circuit measuring device and program
JP2015085773A (en) * 2013-10-30 2015-05-07 公益財団法人鉄道総合技術研究所 Non-insulated track circuit apparatus
JP2016015837A (en) * 2014-07-02 2016-01-28 東日本旅客鉄道株式会社 Maintenance vehicle and collision prevention method
JP3201749U (en) * 2015-10-14 2015-12-24 日本リーテック株式会社 Track short-circuit resistance device with voltmeter

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