JP2020083098A - Track circuit monitoring device - Google Patents

Abstract

To provide a new technique capable of detecting abnormality relating to false dropping of an AC track circuit caused by climate changes such as rainfall.SOLUTION: A track circuit monitoring device 100 includes a measurement terminal 200 installed at each section boundary of a track circuit and a processing device 300. When a transmission current phase difference, which is a phase difference of a transmission current to a local voltage of a track relay 11, satisfies a condition of gradually decrease tendency in that the transmission current phase difference has a gradual decrease tendency with the lapse of time and leakage conductance satisfies a threshold condition showing that it is increased to a value, which should be notified as abnormality in each track circuit, the processing device 300 determines that there is abnormality relating to false dropping of the track circuit due to the climate change.SELECTED DRAWING: Figure 1

Description

The present invention relates to a track circuit monitoring device that monitors the occurrence of an abnormality in an AC track circuit.

A track circuit in railway traffic is a device that uses a rail as a part of an electric circuit to detect the presence/absence of a train, and sends a signal from one end of the rail to short-circuit the rails on the train axle. The presence/absence of a received signal by the track relay is detected by a track relay provided on the other end side of the rail.

However, the AC track circuit is affected by the natural environment, and there is a problem that an illegal fall occurs in which the train is detected as being in the presence of a train even though the train is not entering the line (not in the line). Specifically, due to the fact that the roadbed gets wet due to weather changes such as rainfall and snowfall, the leak conductance between the rail and the roadbed increases, and as a result, the track relay falls into a drop state, regardless of whether the track is actually absent. This is an abnormality that the line is detected.

Therefore, as an example of a technique for detecting an illegal fall of the AC track circuit that occurs during such rain, a track circuit monitoring device based on the phase difference between the received voltage of the track relay and the local voltage is known. Specifically, it has two coils: an orbital coil to which a voltage on the receiving side that receives the signal transmitted to the rail (an applied voltage) is applied, and a local coil to which a voltage indicating a reference phase is applied. In the orbital relay whose contacts are driven by the phase difference between the received voltage on the orbital coil side and the local voltage on the local coil side, the phase of the landing voltage changes due to the increase of leakage conductance. This is a technique for detecting an illegal fall of a track circuit (see Patent Document 1).

JP-A-4-113941

However, the technique disclosed in the above-mentioned Patent Document 1 is based on the AC track circuit by monitoring the signal state (for example, voltage, current, phase difference, etc.) on the receiving side that receives the signal transmitted to the rail. It was a technology to detect unauthorized fall. Therefore, there has been a demand for a technique for detecting an illegal fall of the AC track circuit by monitoring the signal state of the transmitting side, not the receiving side.

In addition, a method of combining a plurality of detection techniques has been desired in order to improve the accuracy of detecting an illegal fall of the AC track circuit. Further, it is convenient if it is possible to detect in advance a situation in which the AC track circuit may be illegally dropped.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a new technique for detecting an abnormality related to an illegal fall of an AC track circuit caused by a weather change such as rainfall. ..

The first invention for solving the above problems is
A track circuit monitoring device for monitoring the occurrence of an abnormality in an AC track circuit,
Local voltage of the orbit relay installed on the receiving side of the AC track circuit, of the measured value of the transmission current of the transmitter of the AC track circuit measured by the transmitter measuring device (for example, the current detector 15 of FIG. 1). Calculating means for calculating a transmission current phase difference which is a phase difference with respect to (for example, the transmission current phase difference calculating section 202 in FIG. 6),
Satisfies a predetermined gradual decrease tendency condition indicating that the time change of the transmission current phase difference when the line is not detected by the AC track circuit is not performed, and the transmission current phase difference is a roadbed. Detection of detecting that a predetermined notification condition regarding the leakage current is present when the first condition that satisfies a predetermined threshold value when the leakage current from the AC track circuit becomes a certain level or more due to getting wet Means (for example, the abnormality sign determination unit 304 in FIG. 6),
It is a track circuit monitoring device equipped with.

According to the first aspect of the present invention, based on the transmission current phase difference that is the phase difference between the transmission current of the transmitter of the AC track circuit and the local voltage of the track relay installed on the receiving side of the AC track circuit, Anomalies can be monitored on the sending side. That is, when the roadbed gets wet due to rainfall or snow, the leak conductance between the rail and the roadbed gradually increases. In other words, the leakage current from the track circuit gradually increases, and as a result, for example, the state of the track relay changes, and the train circuit may be detected as being in the presence of an unoccupied train, but the track circuit may fall illegally. Further, as will be described later in detail, it has been found that the transmission current phase difference can be changed if the leakage conductance between the rail and the bed is changed. From this, according to the first aspect of the present invention, when the transmission current phase difference satisfies the predetermined threshold condition when the leakage current is above a certain level, the transmission side detects an abnormality related to an illegal fall of the track circuit. It becomes possible to do. Further, the threshold condition of the transmission current phase difference is set to a threshold condition when the leakage current does not increase until the orbital relay falls to a fall state, but when it reaches a level that can be said to be a sign or a precursor of an illegal fall. By doing so, it is possible to detect in advance a situation in which an illegal fall of the track circuit may occur.

Further, when the train enters the track circuit, the transmission current phase difference sharply decreases. Therefore, in the first aspect of the invention, it is necessary to satisfy the gradual decrease tendency condition that indicates that the time change of the transmission current phase difference tends to decrease gradually. By including the judgment, it is possible to distinguish and judge whether the train is approaching or the track circuit is abnormal.

Since an AC voltage supplied from a power source is applied to the local coil of the orbit relay, the voltage of the local coil (local voltage) can be regarded as a stable voltage, which is suitable as a reference for the transmission current phase difference.

A second invention is the track circuit monitoring device of the first invention,
The threshold condition and the notification state are defined in a plurality of stages associated with each other,
The detection means detects that the notification state of the corresponding stage is present, depending on which of the threshold conditions of the plurality of stages is satisfied,
It is a track circuit monitoring device.

According to the second aspect of the present invention, for example, it is possible to make a stepwise determination that the possibility of an illegal fall of the track circuit is increasing (the timing of occurrence is approaching), and it can be notified.

A third invention is the track circuit monitoring device according to the first or second invention,
The detection means detects that the notification state is present when a second condition indicating that the transmission current is in a stable state is established as a further additional condition,
It is a track circuit monitoring device.

According to the third aspect of the invention, the accuracy of the abnormality detection related to the improper drop of the AC track circuit can be improved by making the stable condition of the transmission current a further additional condition. This is because the magnitude of the transmission current hardly changes even if the leakage current increases due to the roadbed getting wet.

A fourth invention is the track circuit monitoring device according to any one of the first to third inventions,
Receiving side calculating means for calculating a received voltage phase difference which is a phase difference of the received voltage with respect to the local voltage based on the received voltage and the local voltage of the orbit relay (for example, the received voltage phase difference calculating section 204 of FIG. 6). ,
Equipped with
The detection means, as a further additional condition, satisfies a predetermined reception side gradually decreasing tendency condition indicating that the time change of the receiving voltage phase difference when not present is gradually decreasing, and the receiving voltage phase difference is When the third condition that satisfies a predetermined threshold value on the receiving side when the leakage current becomes a certain level or more is satisfied, the notification state is detected.
It is a track circuit monitoring device.

According to the fourth aspect of the invention, the receiving side threshold condition indicating that the received voltage phase difference, which is the phase difference of the received voltage with respect to the local voltage of the orbit relay, shows a gradual decrease and the leakage current has become a certain level or more. By satisfying the condition as a further additional condition, it is possible to improve the accuracy of the abnormality detection related to the improper fall of the AC track circuit. This is because if the leakage current increases due to the roadbed getting wet, the received voltage phase difference may change.

A fifth invention is the track circuit monitoring device of the fourth invention,
The detection unit, as a further additional condition, satisfies a predetermined reception voltage gradual decrease tendency condition indicating that the temporal change of the reception voltage is gradually decreasing, and the reception voltage, the leakage current is a certain level or more. When the fourth condition satisfying the predetermined reception voltage threshold condition is satisfied, the notification state is detected.
It is a track circuit monitoring device.

According to the fifth aspect of the invention, the AC track circuit is further configured by satisfying a condition that the reception voltage shows a gradual decrease tendency and that the reception voltage threshold condition indicating that the leakage current has become a certain level or more is satisfied. It is possible to improve the accuracy of the abnormality detection related to the illegal fall of. This is because the reception voltage may decrease if the leakage current increases due to the roadbed getting wet.

The sixth invention is
A track circuit monitoring apparatus according to any one of the first to fifth inventions, which is configured by communicatively connecting a measuring terminal provided at a section boundary of the AC track circuit and a processing device having the detecting means,
The measuring terminal is
At the section boundary where the measurement terminal is provided, the calculating unit that calculates the transmission current phase difference based on the transmission current related to the AC track circuit on the transmission side and the local voltage related to the AC track circuit on the reception side. ,
Has,
It is a track circuit monitoring device.

According to the sixth aspect, the phase difference of the transmission current of the AC track circuit on the transmission side of the section boundary with respect to the local voltage of the AC track circuit on the reception side is measured by the measurement terminal provided on one section boundary. A track circuit monitoring device capable of calculating the transmission current phase difference can be configured.

Application example of track circuit monitoring device. Electric circuit model of track circuit. An example of a relationship between a leak conductance and a measured value related to a track circuit. An example of the time change of the transmission current phase difference. Explanatory drawing of determination of a gradually decreasing tendency condition. The functional block diagram of a track circuit monitoring apparatus. An example of an abnormality sign determination condition table. An example of determination result data. The flowchart of track circuit monitoring processing.

[System configuration]
FIG. 1 is an application example of the track circuit monitoring device 100 of the present embodiment. As shown in FIG. 1, the track is provided with track circuits 1T, 2T, 3T,... For each section of the left and right rails R divided into predetermined lengths. The track circuit is a device that performs on-rail detection by utilizing the fact that the left and right rails R are electrically short-circuited by the train wheel axle. In the present embodiment, the track rail circuit is a multi-rail track circuit in which each rail R on the left and right is provided with track insulation 1 at the boundary of the track circuit, and two sets of impedance bonds 3 sandwich the track insulation 1 at the boundary of the track circuit. It is provided.

A transmission transformer 7 which is a transmitter is connected between the rails R on one end side (transmission side) of the track circuit via an impedance bond 3 and a current reducing resistor 5, and between the rails on the other end side (reception side). A track relay 11 is connected via the impedance bond 3 and the phase adjuster 9. The current reduction resistor 5 is provided to limit the current and prevent the device from burning.

The transmission transformer 7 transforms the AC power supplied from the power source 21 such as a commercial power source to generate a track signal (train detection signal) and transmits the track signal between the rails R on the transmission side of the track circuit. That is, the track circuit of this embodiment is an AC track circuit.

The orbital relay 11 is a binary orbital relay that has two coils, an orbital coil and a local coil, and drives contacts by the voltage applied to each coil and the phase difference between them. The orbital coil is connected between the rails R on the receiving side of the orbital circuit, and the voltage of the orbital signal flowing through the orbital circuit is applied to the orbital coil. Therefore, the voltage (hereinafter, “local voltage”) applied to the local coil has a stable phase (also referred to as a cycle). Therefore, in this embodiment, the transmission current phase difference is calculated using this local voltage as a reference voltage. To do.

When a train enters the track circuit, the rail R is short-circuited by the axle of the train, so that the voltage applied to the track coil of the track relay 11 (hereinafter referred to as "reception voltage" or "landing voltage") As the phase difference between the received voltage and the local voltage becomes smaller and the track relay 11 changes from the lifted state to the dropped state, the entry of the train into the track circuit is detected. The phase adjuster 9 is provided to adjust the phase of the reception voltage so that the phase difference between the reception voltage and the local voltage when the line is not present is an optimum value for keeping the track relay 11 in the lifted state.

The track circuit monitoring device 100 is configured by communicatively connecting a plurality of measurement terminals 200 and a processing device 300 via a transmission line 102, and monitors the occurrence of a track circuit abnormality.

The measurement terminal 200 is provided for each section boundary of the track circuit, and the current (transmission current) of the track signal generated by the transmission transformer 7 is input as the measurement value of one track circuit adjacent to the boundary at the boundary. The received voltage (landing voltage) of the orbit relay 11, the local voltage, and the contact condition are input as the measured values of the other orbit circuits adjacent to each other at the boundary. Then, the measurement terminal 200 calculates and inputs the phase difference between the local voltage and the transmission current (transmission current phase difference) and the phase difference between the reception voltage (arrival voltage) and the local voltage (reception voltage phase difference). The measured value is output to the processing device 300 via the transmission line 102.

The transmission current is measured by a current detector (CT) 15 which is a transmission-side measuring instrument inserted between the secondary side of the transmission transformer 7 and the rail R. The transmission current may be calculated by detecting the voltage across the current reduction resistor 5. The received voltage (charged voltage) is measured by a voltage detector (PT: Potential Transformer) 17 which is a receiving-side measuring instrument connected to the orbit coil of the orbit relay 11. The local voltage is measured by a voltage detector (PT) 19 which is a receiving-side measuring instrument connected to the local coil of the track relay 11.

The processing device 300 is a kind of computer including an electronic circuit that performs arithmetic control, and is related to an illegal fall due to a weather change for each track circuit based on a measurement value input from each measurement terminal 200. Detect an abnormality.

[Detection principle]
The principle of the abnormality detection by the processing device 300 related to the illegal fall of the track circuit will be described. FIG. 2 is an electric circuit model of the track circuit. In this electric circuit model of the track circuit, the rail resistance, the rail inductance, and the capacitance are generally determined by the type and material of the rails forming the track circuit, the length, the gauge, and the track bed.

Leakage conductance expresses the magnitude of the leakage current (leakage current) that flows between the left and right rails R that travels through the fastening device that secures the rail R to the sleeper, the sleeper, and the roadbed. When is wet (water adheres), the leakage current increases, that is, the leakage conductance increases. Due to this increase in leakage conductance, an illegal fall of the track circuit may occur such that the track relay 11 changes to a falling state even though no train has entered the track circuit.

FIG. 3 is a graph showing the relationship between the leak conductance and the measured value of the track circuit. This graph is a graph obtained by plotting the measured value of the track circuit at that time while changing the value of the leakage conductance G variously for an electric circuit model configured for a track circuit. However, no train has entered the track circuit (not in line).

Once the length, installation location, environment, etc. of the rail R that constitutes the track circuit are determined, the parameters (specifically, rail resistance, rail inductance, capacitance, etc.) of the constituent elements of the electric circuit model can be determined. it can. Further, the measurement values related to the track circuit are the transmission current, the reception voltage, the transmission current phase difference, and the reception voltage phase difference, and the horizontal axis of the graph is the leakage conductance G, and the vertical axis is the voltage, current, or phase difference. I am trying.

As shown in this graph, the transmission current hardly changed even if the leakage conductance G changed. On the other hand, when the leakage conductance G is small, the transmission current phase difference, the reception voltage phase difference, and the reception voltage hardly change even if the leakage conductance G changes. It was found that it decreased with an increase.

When it is raining or snowing, the leakage conductance of the track circuit increases with respect to the dry road surface condition when the weather is fine. In other words, during rain or snow, the leakage conductance increases with the passage of time such as rainfall, but the transmission current hardly changes, but the transmission current phase difference, the reception voltage phase difference, and the reception voltage are It will decrease gradually over time. In the present embodiment, the abnormality related to the illegal fall of the track circuit is detected from the change in the measured value with the passage of time.

FIG. 4 is an example of the change over time of the transmission current phase difference when the weather changes from fine weather to rain or snow. As shown in FIG. 3, the leakage conductance increases as rainfall or snow continues, and the transmission current phase difference gradually decreases. The abnormality related to the illegal fall of the track circuit based on the transmission current phase difference is detected as follows.

First, at a given determination timing u, it is determined whether or not the transmission current phase difference in a predetermined determination period traced back from that point is gradually decreasing (gradual decrease). As a determining method, it is possible to determine gradually decreasing. Although any method may be used as long as it is a method, for example, for the measurement value of the transmission current phase difference at each time of the determination period, the difference from the measurement value at the start time of the determination period is obtained, and the difference is determined for the entire determination period. Obtain the integrated value (change integrated value) over the range. Then, when the integrated value of change is equal to or larger than a predetermined threshold value, it is determined that the transmission current phase difference in the determination period is gradually reduced (is gradually reduced).

As shown in FIG. 5, this determination is repeated at each determination timing determined at a predetermined time interval, and when it is determined that the current gradually decreases (decreases gradually) a predetermined number of times or more, the transmission current phase difference It is determined that the gradual decrease tendency condition indicating that the time change of is in the gradual decrease tendency is satisfied. Then, when the time change of the transmission current phase difference satisfies the gradual decrease tendency condition and falls below a predetermined abnormality threshold value, it is determined as an abnormality related to an illegal fall of the track circuit.

The abnormal threshold value is a value of the transmission current phase difference when the leakage conductance of the track circuit is equal to or larger than a predetermined value, that is, the predetermined threshold value condition indicating that the leakage current is equal to or larger than a certain value is satisfied. When the phase difference between the received voltage and the local voltage (received voltage phase difference) of the orbital relay 11 decreases to a predetermined value or less, the orbit relay 11 changes from the lifted state to the dropped state. For this reason, the relationship between the leakage conductance and the measured value of the track circuit for the track circuit of interest, such as the graph shown in FIG. 3, is obtained in advance by calculation or experiment. Then, the reception voltage phase difference to be detected before the orbit relay 11 is changed to the falling state is determined, and the value of the transmission current phase difference at which the reception voltage phase difference and the value of the leakage conductance match each other is set as the abnormal threshold value. In this embodiment, an abnormal threshold value is set for the purpose of detecting before the orbital relay 11 changes to a falling state, that is, for detecting a sign that an illegal fall will occur.

Further, it is possible to set a plurality of abnormality thresholds, and to judge the degree of abnormality related to the illegal fall of the track circuit in a stepwise manner, depending on which abnormality threshold is reduced. For example, a plurality of reception voltage phase differences to be detected as a sign before the orbit relay 11 is changed to a falling state are determined in stages, and a value of the transmission current phase difference at which each of these reception voltage phase differences and the value of the leakage conductance are the same is determined. , And set as an abnormal threshold value at each stage. Thereby, for example, it is possible to estimate step by step that the possibility that the track circuit will be illegally dropped is increasing (the timing of occurrence is approaching).

It should be noted that the transmission current phase difference greatly decreases when the train enters the track circuit, but the change is steep, which is significantly different from the gradual decrease (gradual decrease) such as during rain or snow. Therefore, depending on whether or not the gradual decrease tendency condition is satisfied, it is possible to detect the sign of an illegal fall of the track circuit separately from the time when the train enters.

Although the abnormality detection based on the transmission current phase difference has been described with reference to FIGS. 4 and 5, the reception voltage and the reception voltage phase difference can be similarly set as the abnormality detection condition. Further, the transmission current can also be a condition for detecting an abnormality. That is, the first condition is that the time change of the above-mentioned transmission current phase difference satisfies the gradual decrease tendency condition and is less than the predetermined abnormal threshold value, and the second condition regarding the transmission current is further added as the additional condition. One or more of the third condition regarding the reception voltage phase difference and the fourth condition regarding the reception voltage can be added. In that case, when the first condition and the added condition are satisfied, the abnormality related to the illegal drop of the track circuit is detected.

Specifically, as for the second condition, as shown in FIG. 3, the transmission current hardly changes with the increase of the leakage conductance, and therefore the second condition is that the transmission current is in a stable state. .. The stable state means that the transmission current hardly changes (stable) when the change integrated value in each determination period is equal to or less than a predetermined threshold value, and is stable (almost no change) in a plurality of continuous determination periods. If so, it is determined to be in a stable state.

As for the third condition, as shown in FIG. 3, the reception voltage phase difference changes in the same manner as the transmission current phase difference, that is, the reception voltage phase difference decreases with an increase in the leakage conductance. The third condition is that the time change of the reception voltage phase difference satisfies the gradual decrease tendency condition and is less than the abnormal threshold value for the reception voltage phase difference, as in the first condition of.

As for the fourth condition, as shown in FIG. 3, the reception voltage has a change similar to the transmission current phase difference such that it decreases with an increase in the leakage conductance. As with the first condition, the fourth condition is that the time change of the reception voltage satisfies the gradually decreasing tendency condition and is below the abnormal threshold value for the reception voltage.

[Function configuration]
FIG. 6 is a functional configuration diagram of the track circuit monitoring device 100. The track circuit monitoring device 100 is configured by communicatively connecting a plurality of measurement terminals 200 provided at each section boundary of the AC track circuit and a processing device 300.

In the measurement terminal 200, the transmission current of the transmission side track circuit, the reception voltage of the track relay 11 of the reception side track circuit, the local voltage, and the contact condition at the section boundary of the track circuit provided with the measurement terminal 200. And are input. The measurement terminal 200 includes a transmission current phase difference calculation unit 202, a reception voltage phase difference calculation unit 204, and a transmission control unit 206.

The transmission current phase difference calculation unit 202 corresponds to a calculation means, and is a local voltage of the orbit relay installed on the reception side of the track circuit, of the measured value of the transmission current of the transmitter of the track circuit measured by the transmission side measurement device. The transmission current phase difference, which is the phase difference with respect to, is calculated. That is, at the section boundary of the track circuit in which the measurement terminal 200 is provided, the transmission current phase difference, which is the phase difference between the transmission current of the track circuit on the transmission side and the local voltage of the track relay 11 of the track circuit on the reception side. To calculate.

The reception voltage phase difference calculation unit 204 corresponds to the reception side calculation means, and based on the reception voltage and the local voltage of the orbit relay installed on the reception side of the track circuit, the reception voltage which is the phase difference of the reception voltage with respect to the local voltage. Calculate the phase difference. That is, at the boundary of the section where the measurement terminal 200 is provided, the reception voltage phase difference, which is the phase difference of the reception voltage with respect to the local voltage of the receiving side track circuit, is calculated.

The transmission control unit 206 uses the values of the input transmission current and the transmission current phase difference calculated by the transmission current phase difference calculation unit 202 as the measurement values of the transmission side track circuit and the reception side track circuit. As the measured values, the input reception voltage, local voltage, and contact condition, and the respective values of the reception voltage phase calculated by the reception voltage phase difference calculation unit 204 are associated with the measurement date and time and the identification information of the track circuit. And outputs the measured data to the processing device 300.

The processing device 300 includes a measurement data storage unit 302, an abnormality sign determination unit 304, and a notification control unit 306, and stores measured value storage data 310, an abnormality sign determination condition table 312, and determination result data 314. To do.

The measurement data storage unit 302 stores and stores the measurement data input from the measurement terminal 200 as measurement value storage data for each track circuit.

The abnormality sign determination unit 304 corresponds to the detection means, and satisfies a predetermined gradual decrease tendency condition indicating that the time change of the transmission current phase difference when the line is not detected by the track circuit is declining, and , If the first condition that satisfies the predetermined threshold condition when the leakage current from the track circuit becomes a certain level or more due to the transmission current phase difference due to the roadbed getting wet, the predetermined notification state regarding the leakage current is established. Detect that there is. In addition, a plurality of levels associated with each other are set for the threshold condition and the notification state, and depending on which of the threshold conditions of the multiple levels is satisfied, it is detected that the corresponding state is in the notification state. In addition, as a further additional condition, the notification state is detected when the second condition indicating that the transmission current is in the stable state is satisfied. Further, as a further additional condition, the predetermined receiving side gradually decreasing tendency condition indicating that the time change of the receiving voltage phase difference when there is no line is gradually decreasing is satisfied, and the receiving voltage phase difference has a certain level of leakage current. If the third condition that satisfies the predetermined receiving-side threshold value in the above case is satisfied, the notification state is detected. Further, as a further additional condition, a predetermined reception voltage gradual decrease tendency condition indicating that the time change of the reception voltage is gradually decreasing is satisfied, and the reception voltage is a predetermined condition when the leakage current becomes a certain level or more. When the fourth condition that satisfies the reception voltage threshold value is satisfied, the notification state is detected.

That is, the abnormality symptom determination unit 304 determines the abnormality related to the erroneous fall (the symptom of the illicit fall in the present embodiment) for each track circuit based on the measured value accumulated data 310. Specifically, for each track circuit, the period during which the track circuit does not detect the presence of a track is targeted, and at each determination timing determined at a predetermined interval, during the predetermined determination period traced back from the time point. The measurement data is extracted from the measured value accumulation data 310, and according to the abnormality sign determination condition table 312, it is determined for each condition item whether a corresponding condition is satisfied. The absence of the line can be judged from the contact condition indicating the state (elevated state or dropped state) of the track relay of the track circuit. The determination result at each determination timing is accumulated and stored as determination result data 314.

FIG. 7 is a diagram showing an example of the data structure of the abnormality sign determination condition table 312. The abnormality sign determination condition table 312 is prepared for each track circuit, and stores a change condition and a threshold condition in association with each condition item. The condition item is the type of the measured value to be determined and corresponds to each of the first to fourth conditions. The change condition specifies whether to judge whether the measurement value is gradually decreasing or stable as a time change of the measurement value in one judgment period, and the threshold value of the change integrated value which is a condition for judging the change (gradual decrease or stable). To set. The threshold value condition is defined only for the condition item for determining the gradual decrease as the change condition, and an abnormal threshold value indicating that the leakage conductance has become equal to or larger than a predetermined value is set. FIG. 7 shows an example in which two abnormal threshold values are set in stages.

FIG. 8 is a diagram showing an example of the data structure of the determination result data 314. The determination result data 314 is prepared for each track circuit, and stores the determination result at each time as the determination timing in time series for each condition item. The determination result includes the determination result of the change condition and the threshold condition, and the determination result of whether the time change of the measured value based on the determination result of the change condition is the gradually decreasing tendency condition or the stable state. That is, for the first, third, and fourth conditions including the gradually decreasing tendency condition, the determination result is a change condition determining result indicating whether or not it is gradually decreasing, the gradually decreasing tendency condition determining result, and an abnormal threshold value or less. And a threshold condition indicating whether or not The gradual decrease tendency condition is determined based on the determination result of the change condition up to that point, and, for example, when it is determined that the change condition for a plurality of continuous determination periods up to that point is satisfied, the gradual decrease tendency condition is set. It is determined to meet. In addition, the second condition including the stable state includes the determination result of the change condition indicating whether or not it is stable, and the determination result of the stable state. The determination state is determined based on the determination result of the change condition up to that point, and, for example, when it is determined that the change conditions for a plurality of determination periods continuous up to that point are satisfied, the state is stable. To be judged.

Then, the abnormality sign determination unit 304 determines at each determination timing whether each of the first to fourth conditions is satisfied. That is, with respect to the first, third, and fourth conditions, when the gradually decreasing tendency condition is satisfied and the threshold condition is satisfied, it is determined that the condition is satisfied, and the second condition is in a stable state. If it is determined that the condition is satisfied. Then, based on the combination of the conditions that are satisfied among these first to fourth conditions, the sign of the illegal fall of the track circuit is determined. In the present embodiment, in addition to the satisfaction of the first condition, if at least one of the second to fourth conditions is satisfied as an additional condition, a sign of an illegal fall of the corresponding track circuit is determined. ..

The notification control unit 306 performs a predetermined notification process when the abnormality sign determination unit 304 determines the sign of an illegal fall of any of the track circuits. For example, it is possible to display on the display device 322 a message indicating the track circuit that has determined the sign of an illegal fall, to output the message by voice from the voice output device, and to turn on the lamp corresponding to the track circuit. Further, when a plurality of abnormal thresholds are set as the threshold condition, it may be notified including information indicating which abnormal threshold is satisfied as the threshold condition as the degree of the sign.

[Process flow]
FIG. 9 is a flowchart illustrating the flow of the track circuit monitoring process. This processing is processing for determining an abnormality related to an illegal fall of each track circuit, and is executed by the processing device 300. However, the measurement data is output from each measurement terminal 200 to the processing device 300 at any time, and in the processing device 300, the measurement data storage unit 302 stores the measurement value of the measurement data input from each measurement terminal 200 at any time. It is accumulated and updated as data 310.

In the track circuit monitoring process, if the determination timing determined at a predetermined interval arrives (step S1: YES), the abnormality sign determination unit 304 sets a determination period that is traced back by a predetermined period from the timing point (step S1). S3).

Next, the loop A is repeatedly processed for each track circuit. That is, the abnormality sign determination unit 304 extracts the measurement data of the target track circuit during the determination period from the measurement value accumulated data 310 (step S5). Then, according to the abnormality sign determination condition table 312, it is determined for each condition item whether the extracted measurement data satisfies the change condition and the threshold value (step S7).

Then, based on these determination results, it is determined whether or not there is an abnormality (indication of an illegal fall in this embodiment) related to an illegal fall due to a weather change in the target track circuit (step S9). That is, for each condition item, it is determined whether the gradual decrease tendency condition is satisfied or the stable state is satisfied depending on whether the change condition is continuously satisfied a predetermined number of times or more including the determination result of the current change condition. In addition to the determination result of the threshold condition, it is determined whether the first to fourth conditions corresponding to each condition item are satisfied. Then, the presence/absence of a sign is determined based on the combination of conditions determined to be satisfied. In the present embodiment, if at least one of the second to fourth conditions is satisfied in addition to the first condition, it is determined that the target track circuit has a sign. The processing of loop A is performed in this way.

As a result, if it is determined that one or more track circuits have a sign of an illegal fall (step S11: YES), the notification control unit 306 performs a predetermined notification process of notifying the track circuits that are judged to have a sign (step S11). S13). When the above processing is performed, the process returns to step S1 and the same processing is repeated.

[Effect]
As described above, according to the track circuit monitoring device 100 of the present embodiment, the track circuit of the track circuit is based on the transmission current phase difference which is the phase difference of the transmission current with respect to the local voltage of the track relay 11 provided on the receiving side of the track circuit. It is possible to monitor abnormalities related to illegal falls. That is, when the transmission current phase difference satisfies the gradual decrease tendency condition indicating that the transmission current phase gradually decreases with time, and the threshold condition indicating that the leakage conductance has increased to a value to be notified as an abnormality is satisfied. First, it is determined that the abnormality is due to an illegal fall of the track circuit due to weather change. Further, as a further additional condition, it is possible to determine an abnormality related to an illegal fall of the track circuit based on the transmission current, the phase difference between the reception voltage of the track relay 11 and the local voltage, and the reception voltage. it can. Further, based on the phase difference of the transmission current on the transmission side with respect to the local voltage of the orbital relay 11 on the reception side, one measuring terminal 200 provided at the section boundary of the orbital circuit monitors the abnormality of the track circuit. be able to.

[Modification]
Note that the applicable embodiments of the present invention are not limited to the above-described embodiments, and it goes without saying that appropriate modifications can be made without departing from the spirit of the present invention.

(A) Functional Configuration of Track Circuit Monitoring Device 100 For example, the processing device 300 may include the transmission current phase difference calculation unit 202 and the reception voltage phase difference calculation unit 204 included in the measurement terminal 200.

R rail, 7 transmission transformer, 11 track relay 100 track circuit monitoring device 200 measurement terminal 202 transmission current phase difference calculation unit 204 reception voltage phase difference calculation unit 206 transmission control unit 300 processing device 302 measurement data storage unit, 304 abnormality sign determination unit 306 Notification control unit 310 Measured value accumulation data 312 Abnormal sign determination condition table 314 Determination result data

Claims (6)

A track circuit monitoring device for monitoring the occurrence of an abnormality in an AC track circuit,
Calculate the transmission current phase difference, which is the phase difference of the measured value of the transmission current of the transmitter of the AC track circuit measured by the transmitter side measuring device with respect to the local voltage of the track relay installed on the reception side of the AC track circuit. Calculating means to
Satisfies a predetermined gradual decrease tendency condition indicating that the time change of the transmission current phase difference when the line is not detected by the AC track circuit is not performed, and the transmission current phase difference is a roadbed. Detection of detecting that a predetermined notification condition regarding the leakage current is present when the first condition that satisfies a predetermined threshold value when the leakage current from the AC track circuit becomes a certain level or more due to getting wet Means and
Track circuit monitoring device equipped with. The threshold condition and the notification state are defined in a plurality of stages associated with each other,
The detection means detects that the notification state of the corresponding stage is present, depending on which of the threshold conditions of the plurality of stages is satisfied,
The track circuit monitoring device according to claim 1. The detection means detects that the notification state is present when a second condition indicating that the transmission current is in a stable state is established as a further additional condition,
The track circuit monitoring device according to claim 1. Receiver-side calculating means for calculating a received voltage phase difference, which is a phase difference of the received voltage with respect to the local voltage, based on the received voltage and the local voltage of the orbit relay,
Equipped with
The detection means, as a further additional condition, satisfies a predetermined reception side gradually decreasing tendency condition indicating that the time change of the receiving voltage phase difference when not present is gradually decreasing, and the receiving voltage phase difference is When the third condition that satisfies a predetermined threshold value on the receiving side when the leakage current becomes a certain level or more is satisfied, the notification state is detected.
The track circuit monitoring device according to claim 1. The detection unit, as a further additional condition, satisfies a predetermined reception voltage gradual decrease tendency condition indicating that the temporal change of the reception voltage is gradually decreasing, and the reception voltage, the leakage current is a certain level or more. When the fourth condition satisfying the predetermined reception voltage threshold condition is satisfied, the notification state is detected.
The track circuit monitoring device according to claim 4. The track circuit monitoring device according to any one of claims 1 to 5, wherein a measurement terminal provided at a section boundary of the AC track circuit and a processing device having the detection means are communicatively connected to each other.
The measuring terminal is
At the section boundary where the measurement terminal is provided, the calculating unit that calculates the transmission current phase difference based on the transmission current related to the AC track circuit on the transmission side and the local voltage related to the AC track circuit on the reception side. ,
Has,
Track circuit monitoring device.

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