JP2019014277A - Track circuit monitoring apparatus - Google Patents

Abstract

To provide a new technique capable of detecting an abnormality associated with improper dropping of an alternating current track circuit caused by a weather change such as rainfall.SOLUTION: A track circuit monitoring apparatus 100 includes: measuring terminals 200, each installed at a section boundary of a track circuit; and a processing device 300. The processing device 300 determines that an abnormality associated with improper dropping of the relevant track circuit due to a weather change has occurred when, in the track circuit, a transmission current phase difference, namely a phase difference of a transmission current to a transmission voltage of a transmission transformer 7, satisfies a tapering-off condition which shows that the phase difference is in a trend of tapering off with time, and also satisfies a threshold condition which shows that the leakage conductance has increased to a level requiring a notification of abnormality.SELECTED DRAWING: Figure 1

Description

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

  A track circuit in rail traffic is a device that detects the presence or absence of a train using a rail as a part of an electric circuit, transmits a signal from one end of the rail, and shorts between the rails on the train axle The presence / absence of a received signal is detected by a track relay provided on the other end of the rail.

  However, in the AC track circuit, there is a problem of the occurrence of an unauthorized fall that is detected as an existing line despite the fact that the train does not enter (non-existing line) due to the influence of the natural environment. Specifically, when the roadbed gets wet due to weather changes such as rainfall or snowfall, the leakage conductance between the rail and the roadbed increases, and as a result, the track relay falls into a fall state. This is an anomaly that is detected as a standing line.

  Thus, as an example of a technique for detecting such an improper fall of the AC track circuit that occurs during 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: a track coil to which a receiving side voltage (arrival voltage) for receiving a signal transmitted to the rail is applied, and a local coil to which a voltage indicating a reference phase is applied. In the orbital relay where the contact is driven by the phase difference between the received voltage on the track coil side and the local voltage on the local coil side, the phase of the received voltage changes due to an increase in leakage conductance. This is a technique for detecting unauthorized fall of the track circuit (see Patent Document 1).

Japanese Patent Laid-Open No. 4-113941

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

  In addition, a method of combining a plurality of detection techniques has been desired in order to improve the accuracy of detection of unauthorized fall of an AC track circuit. Furthermore, 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 unauthorized fall of an AC track circuit caused by a weather change such as rainfall. .

The first invention for solving the above-described problems is
A track circuit monitoring device for monitoring the occurrence of an abnormality in an AC track circuit,
Calculating means for calculating a transmission current phase difference, which is a phase difference of the transmission current with respect to the transmission voltage, based on a measurement value measured by a transmission-side measuring device of the transmission voltage and transmission current of the transmitter of the AC track circuit; ,
Satisfying a predetermined gradual decreasing tendency condition indicating that the time change of the transmission current phase difference in a non-existing line where no presence line detection is performed by the AC track circuit is declining, and the transmission current phase difference is Detection that detects that a predetermined notification state relating to leakage current is in effect when a first condition that satisfies a predetermined threshold condition is satisfied when the leakage current from the AC track circuit exceeds a certain level due to being wet. Means,
Is a track circuit monitoring device.

  According to the first aspect, it is possible to monitor the abnormality of the AC track circuit on the transmission side based on the transmission current phase difference that is the phase difference of the transmission current with respect to the transmission voltage of the transmitter of the AC track circuit. That is, when the roadbed gets wet due to rainfall or snowfall, the leakage 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 track circuit may change its state, and the track circuit may be detected to be in the presence of a non-existing track even if it is not present. Further, although details will be described later, it has been found that when the leakage conductance between the rail and the road bed changes, the transmission current phase difference can also change. Therefore, in the first aspect of the invention, when the transmission current phase difference satisfies a predetermined threshold condition when the leakage current becomes a certain level or more, an abnormality related to the unauthorized drop of the track circuit is detected on the transmission side. It becomes possible to do. In addition, the threshold condition for the transmission current phase difference is set to the threshold condition when, for example, the leakage current does not increase until the track relay reaches the falling state, but reaches a level that can be said to be a sign or a precursor of unauthorized dropping. By doing so, it is possible to detect in advance a situation in which the track circuit may be illegally dropped.

  In addition, when the train enters the track circuit, the transmission current phase difference rapidly decreases. Therefore, in the first invention, the gradual decreasing tendency condition indicating that the time change of the transmission current phase difference tends to gradually decrease is satisfied. By determining as an additional condition, it is possible to distinguish and determine whether the train is approaching or the track circuit is abnormal.

A second invention is a track circuit monitoring device according to 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 state of notification is in a corresponding stage depending on which of the threshold conditions of the plurality of stages is satisfied,
Track circuit monitoring device.

  According to the second aspect of the invention, for example, it is possible to determine and notify in a stepwise manner that there is a high possibility that an illegal fall of the track circuit has occurred (the timing at which it occurs is approaching).

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

  According to the third invention, it is possible to improve the accuracy of abnormality detection related to unauthorized dropping of the AC track circuit by making the transmission voltage and the transmission current in a stable state as a further additional condition. This is because the magnitude of the transmission voltage and the transmission current hardly change even if the leakage current increases due to the roadbed getting wet.

A fourth invention is a track circuit monitoring device according to any one of the first to third inventions,
The received voltage phase difference, which is the phase difference of the received voltage with respect to the local voltage, based on the measured value measured by the receiving voltage measuring device and the local voltage receiving device of the track relay installed on the receiving side of the AC track circuit Receiving side calculating means for calculating
With
The detection means satisfies, as a further additional condition, a predetermined reception side gradual decrease tendency condition indicating that the time change of the reception voltage phase difference at the time of absence is gradual decrease, and the reception voltage phase difference is Detecting that the current state is in the notification state when a third condition that satisfies a predetermined reception threshold condition when the leakage current becomes a certain level or more is satisfied,
Track circuit monitoring device.

  According to the fourth invention, the received voltage phase difference, which is the phase difference of the received voltage with respect to the local voltage of the track relay installed on the receiving side of the AC track circuit, shows a gradual decreasing tendency, and the leakage current is more than a certain level. It is possible to improve the accuracy of abnormality detection related to unauthorized fall of the AC track circuit by making the reception side threshold condition indicating that it has become a further additional condition. This is because the received voltage phase difference can change when the leakage current increases due to the roadbed getting wet.

5th invention is the track circuit monitoring apparatus of 4th invention, Comprising:
The detection means satisfies, as a further additional condition, a predetermined reception voltage gradual decrease tendency condition indicating that the time change of the reception voltage is gradual decrease, and the reception voltage is equal to or greater than a certain level of the leakage current. When the fourth condition that satisfies the predetermined reception voltage threshold condition is satisfied, the notification state is detected.
Track circuit monitoring device.

  According to the fifth aspect of the present invention, an additional condition is that the reception voltage threshold condition that indicates that the reception voltage shows a gradual decrease and that the leakage current is equal to or higher than a certain level is provided. It is possible to improve the accuracy of abnormality detection related to the unauthorized fall of the camera. This is because the received voltage can decrease when the leakage current increases due to the roadbed getting wet.

The sixth invention is:
The track circuit monitoring device according to the fourth or fifth aspect of the present invention, wherein the measurement terminal provided for each section boundary of the AC track circuit and the processing device having the detection means are connected by communication,
The measuring terminal is
The calculating means for calculating the transmission current phase difference relating to the AC track circuit on the transmission side at the section boundary provided with the measurement terminal;
The receiving side calculating means for calculating the received voltage phase difference relating to the AC circuit on the receiving side at the section boundary provided with the measurement terminal;
Having
Track circuit monitoring device.

  According to the sixth invention, the transmission terminal phase difference related to the AC track circuit on the transmission side and the reception voltage phase difference related to the AC track circuit on the reception side are measured by the measuring terminal provided on one zone boundary. An orbital circuit monitoring device that can be calculated can be configured.

Application example of track circuit monitoring device. Electric circuit model of track circuit. An example of the relationship between leakage conductance and the measured value which concerns on a track circuit. An example of the time change of a transmission current phase difference. Explanatory drawing of determination of a gradual 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 a track circuit monitoring process.

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

  A transmission transformer 7 as a transmitter is connected between the rail 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). The track relay 11 is connected via the impedance bond 3 and the phase adjuster 9. The current reducing resistor 5 is provided to limit the current and prevent the device from burning out.

  The transmission transformer 7 transforms AC power supplied from a power source 21 such as a commercial power source to generate a track signal (train detection signal) and transmits it 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 track relay 11 is a two-way track relay that has two coils, a track coil and a local coil, and drives a contact point by a voltage applied to each coil and its phase difference. The track coil is connected between the rails R on the receiving side of the track circuit, and the voltage of the track signal flowing through the track circuit is applied. The AC voltage supplied from the power source 21 is applied to the local coil. Since the phase (also referred to as “period”) of the voltage applied to the local coil (hereinafter referred to as “local voltage”) is stable, the phase of the local voltage is used as a reference.

  When a train enters the track circuit, the rails R are short-circuited by the train axle so that a voltage applied to the track coil of the track relay 11 (hereinafter referred to as “received voltage”, also referred to as “arrival voltage”). In addition to the decrease, the phase difference between the received voltage and the local voltage becomes small, and the track relay 11 changes from the hoisting state to the falling state, thereby detecting the entry of the train into the track circuit. The phase adjuster 9 is provided to adjust the phase of the received voltage so that the phase difference between the received voltage and the local voltage when there is no line is set to an optimal value for the track relay 11 to maintain the hoisting state.

  The track circuit monitoring device 100 includes a plurality of measurement terminals 200 and a processing device 300 that are connected to each other via a transmission line 102, and monitors the occurrence of an abnormality in the track circuit.

  The measurement terminal 200 is provided for each section boundary of the track circuit, and the voltage (transmission voltage) of the track signal generated by the transmission transformer 7 and the current (transmission) are measured values related to one track circuit adjacent to the track circuit. Current) and a received voltage (landing voltage) of the track relay 11, a local voltage, and a contact condition are input as measured values of the other track circuit adjacent at the boundary. Then, the measurement terminal 200 calculates and inputs the phase difference between the transmission 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 voltage is measured by a voltage detector (PT: Potential Transformer) 13 that is a transmission side measuring instrument connected to the secondary side of the transmission transformer 7. The transmission current is measured by a current detector (CT: Current Transformer) 15 that is a transmission side measuring instrument inserted between the secondary side of the transmission transformer 7 and the rail R. Note that the transmission current may be calculated by detecting the voltage across the current reducing resistor 5. The received voltage (coming voltage) is measured by a voltage detector (PT) 17 that is a receiving side measuring instrument connected to the track coil of the track relay 11. The local voltage is measured by a voltage detector (PT) 19 that is a receiving side measuring instrument connected to a local coil of the track relay 11.

  The processing device 300 is a kind of computer configured to include an electronic circuit that performs arithmetic control. Based on the measurement value input from each measurement terminal 200, the processing device 300 relates to an unauthorized fall due to weather change for each track circuit. Detect abnormalities.

[Detection principle]
The principle of abnormality detection related to unauthorized dropping of the track circuit by the processing device 300 will be described. FIG. 2 is an electric circuit model of the track circuit. In the electric circuit model of the track circuit, the rail resistance, rail inductance, and capacitance are generally determined by the types of the material and shape of the rail constituting the track circuit, the length, the gap, the roadbed, and the like.

  Leakage conductance represents the magnitude of the leakage current (leakage current) that flows between the right and left rails R along the fastening device, sleepers, and road bed that fixes the rail R to the sleeper. When the is wet (moisture is attached), the leakage current increases, that is, the leakage conductance increases. Due to the increase in leakage conductance, the track circuit 11 may be illegally dropped such that the track relay 11 changes to the fall state even though the train has not entered the track circuit.

  FIG. 3 is a graph showing the relationship between the leakage conductance and the measured value related to the track circuit. This graph is a graph obtained by plotting the measured values of the track circuit at that time while changing the value of the leakage conductance G in various ways for an electric circuit model configured for a track circuit. However, the train does not enter the track circuit (non-existing line).

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

  As shown in this graph, the transmission voltage and the transmission current hardly changed even when 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 the increase.

  When it rains or snows, the leakage conductance of the track circuit increases with respect to the condition when the condition of the roadbed in a fine weather is dry. That is, at the time of rain or snow, the leakage conductance increases with the lapse of the duration of the rain, etc., but the transmission voltage and the transmission voltage hardly change, but the transmission current phase difference, the reception voltage phase difference, and The reception voltage gradually decreases with time. In the present embodiment, an abnormality related to an illegal drop of the track circuit is detected from a change in the measured value with time.

  FIG. 4 is an example of a temporal change in the transmission current phase difference when the weather changes from fine weather to rain or snow. As shown in FIG. 3, the transmission conductance increases gradually due to the increase in leakage conductance due to the continued rainfall or snowfall. Detection of an abnormality related to the unauthorized drop of the track circuit based on such a transmission current phase difference is performed as follows.

  First, at a given determination timing u, it can be determined whether or not the transmission current phase difference in a predetermined determination period going back from that point is gradually decreasing (gradual decrease). Any method may be used as long as it is a method.For example, a difference between the measured value of the transmission current phase difference at each time in the determination period and the measured value at the start time of the determination period is obtained, Find the integrated value (change integrated value). And when this change integrated value is more than a predetermined threshold value, it determines with the transmission current phase difference in the said determination period decreasing gradually (it is decreasing gradually).

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

  The abnormal threshold is a value of a transmission current phase difference in a case where a predetermined threshold condition that indicates that the leakage conductance of the track circuit is equal to or higher than a predetermined value, that is, the leakage current is equal to or higher than a certain level. When the phase difference (reception voltage phase difference) between the received voltage and the local voltage is reduced to a predetermined value or less, the track relay 11 changes from the hoisting state to the falling state. For this reason, the relationship between the leakage conductance and the measured value related to the track circuit is obtained in advance for the target track circuit, such as the graph shown in FIG. Then, a reception voltage phase difference to be detected before the track relay 11 changes to the fall state is determined, and a value of the transmission current phase difference at which the reception voltage phase difference and the leakage conductance value coincide is set as an abnormal threshold value. In the present embodiment, an abnormal threshold is set for the purpose of detecting before the track relay 11 changes to the fall state, that is, detecting a sign that an unauthorized fall will occur.

  In addition, a plurality of abnormality threshold values are set, and the degree of abnormality related to the unauthorized fall of the track circuit can be determined step by step depending on which abnormality threshold value is reduced. For example, a plurality of reception voltage phase differences to be detected as a sign before the track relay 11 changes to a falling state are determined in stages, and the values of the transmission current phase differences in which the values of the leakage conductances coincide with the respective reception voltage phase differences. , And set as an abnormal threshold value for each stage. As a result, for example, it is possible to estimate in a stepwise manner that the possibility of unauthorized dropping of the track circuit has increased (the timing at which it has occurred is approaching).

  Note that the transmission current phase difference greatly decreases when the train enters the track circuit, but the change is steep, and is greatly different from a gradual decrease (gradual decrease) such as during rain or snow. For this reason, depending on whether or not the gradual decreasing tendency condition is satisfied, a sign of unauthorized fall of the track circuit can be detected separately from the time of entering the train.

  Although the abnormality detection based on the transmission current phase difference has been described with reference to FIG. 4 and FIG. 5, the abnormality detection condition can be similarly applied to the reception voltage and the reception voltage phase difference. Further, the transmission voltage and the transmission current can also be used as conditions for detecting an abnormality. That is, the first condition is that the time change of the transmission current phase difference described above satisfies the gradual decreasing tendency condition and falls below a predetermined abnormality threshold, and a further additional condition is that for the transmission voltage and transmission current. One or more conditions of the second condition, the third condition for the received voltage phase difference, and the fourth condition for the received voltage can be added. In that case, when the first condition and the added condition are satisfied, an abnormality related to the unauthorized fall of the track circuit is detected.

  Specifically, with respect to the second condition, as shown in FIG. 3, since the transmission voltage and the transmission current hardly change with an increase in leakage conductance, both the transmission voltage and the transmission current are in a stable state. Is the second condition. The stable state is regarded as almost unchanged (stable) when the integrated change value in each determination period is equal to or less than a predetermined threshold for each of the transmission voltage and the transmission current, and stable in a plurality of consecutive determination periods. When it is determined that (almost no change), it is determined that it is in a stable state.

  As for the third condition, as shown in FIG. 3, the received voltage phase difference changes in the same manner as the transmitted current phase difference, such as decreasing with increasing leakage conductance. As in the first condition, the third condition is that the time variation of the reception voltage phase difference satisfies the gradually decreasing tendency condition and is below the abnormal threshold value for the reception voltage phase difference.

  As for the fourth condition, as shown in FIG. 3, the received voltage changes in the same way as the transmission current phase difference, such as decreasing with increasing leakage conductance. Similar to the first condition, the fourth condition is that the time change of the received voltage satisfies the gradually decreasing tendency condition and is below the abnormal threshold for the received voltage.

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

  The measurement terminal 200 receives the transmission voltage and transmission current of the transmission side track circuit at the section boundary of the track circuit provided with the measurement terminal 200, and receives the reception voltage of the track relay 11 of the reception side track circuit. Local voltage and contact conditions 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 calculation means, and is based on the transmission voltage of the transmission circuit of the track circuit and the measurement value measured by the transmission-side measuring instrument of the transmission current with the phase difference of the transmission current with respect to the transmission voltage. A certain transmission current phase difference is calculated. Further, the transmission current phase difference relating to the transmission-side track circuit is calculated at the section boundary where the measurement terminal 200 is provided.

  That is, the transmission current phase difference calculation unit 202 calculates a transmission current phase difference that is a phase difference of the transmission current with respect to the input transmission voltage.

  The reception voltage phase difference calculation unit 204 corresponds to the reception side calculation means, and is based on the measurement value measured by the reception voltage measuring device of the orbital relay installed on the reception side of the track circuit and the reception voltage measuring device of the local voltage. A received voltage phase difference that is a phase difference of the received voltage with respect to the voltage is calculated. Further, the reception voltage phase difference relating to the receiving side track circuit is calculated at the section boundary where the measurement terminal 200 is provided.

  That is, the reception voltage phase difference calculation unit 204 calculates the phase difference of the reception voltage with respect to the input local voltage.

  The transmission control unit 206 receives each value of the input transmission voltage, the transmission current, and the transmission current phase difference calculated by the transmission current phase difference calculation unit 202 as the measurement value related to the transmission side track circuit, and the reception As the measurement values related to the track circuit on the side, the input reception voltage, local voltage, and contact condition, and each value of the reception voltage phase calculated by the reception voltage phase difference calculation unit 204 are measured. The data is output to the processing device 300 as measurement data in association with the identification information.

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

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

  The abnormality sign determination unit 304 corresponds to a detection unit, satisfies a predetermined gradual decrease tendency condition indicating that the time change of the transmission current phase difference at the time of non-existence where the presence line detection is not performed by the track circuit is gradual decrease, and When the first condition that satisfies the predetermined threshold condition when the leakage current from the track circuit becomes higher than a certain level due to the road base getting wet is the transmission current phase difference, a predetermined notification state regarding the leakage current The threshold condition and the notification state are determined in a plurality of stages that are associated with each other, and depending on which of the threshold conditions of the plurality of stages is satisfied, the notification condition is in the corresponding stage. Detect that. Further, as a further additional condition, when the second condition indicating that the transmission voltage and the transmission current are in a stable state is satisfied, it is detected that the notification state is established. The predetermined threshold on the receiving side when the reception voltage phase difference satisfies the predetermined receiving side gradually decreasing tendency condition indicating that the time variation of the received voltage phase difference is gradually decreasing and the leakage current becomes a certain level or more. When the third condition that satisfies the condition is satisfied, it is detected that the notification state is established. Further, as a further additional condition, a predetermined reception voltage gradually decreasing tendency condition indicating that a time change of the reception voltage is gradually decreasing is satisfied, and the reception voltage is a predetermined value when the leakage current becomes a certain level or more. When the fourth condition that satisfies the reception voltage threshold condition is satisfied, it is detected that the notification state is established.

  That is, the abnormality sign determination unit 304 determines an abnormality related to an unauthorized fall (in this embodiment, an unauthorized fall sign) for each track circuit based on the measured value accumulation data 310. Specifically, with respect to each track circuit, a period in which the track line is not detected by the track circuit is a target period, and at each determination timing determined at a predetermined interval, The measurement data is extracted from the measurement value accumulation data 310, and it is determined whether the corresponding condition is satisfied for each condition item according to the abnormality sign determination condition table 312. It can be determined from the contact condition indicating the state of the track relay of the track circuit (upward state or drop state) that it is not present. Determination results at each determination timing are accumulated and stored as determination result data 314.

  FIG. 7 is a diagram illustrating an example of a data configuration of the abnormality sign determination condition table 312. As illustrated in FIG. 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 measurement value to be determined, and corresponds to each of the first to fourth conditions. The change condition specifies whether to determine gradually decreasing or stable as the time change of the measured value in one determination period, and the threshold value of the change integrated value that is a condition for determining the change (gradually decreasing or stable) Set. The threshold condition is determined only for the condition item for determining gradual decrease as the change condition, and an abnormal threshold value indicating that the leakage conductance is equal to or greater than a predetermined value is set. FIG. 7 shows an example in which two abnormal threshold values are determined in stages.

  FIG. 8 is a diagram illustrating an example of a data configuration of the determination result data 314. The determination result data 314 is prepared for each track circuit, and stores the determination results at each time as the determination timing for each condition item in time series. The determination result includes the determination result of the change condition or the threshold condition, and the determination result of whether the time change of the measurement value based on the determination result of the change condition is a gradually decreasing tendency condition or a stable state. That is, for the first, third, and fourth conditions including the gradually decreasing tendency condition, as the determination result, the determination result of the change condition indicating whether or not it is gradually decreasing, the determination result of the gradually decreasing tendency condition, and the abnormality threshold value or less And a threshold value 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. For example, when it is determined that the change condition for a plurality of determination periods consecutive up to that point is satisfied, It is determined to satisfy. In addition, the second condition including the stable state includes a determination result of the change condition indicating whether or not the condition is stable and a determination result of whether or not the condition is stable. The determination state is determined based on the determination result of the change condition up to that point. For example, when it is determined that the change conditions for a plurality of determination periods continuous up to that point are satisfied, the determination state is in a stable state. Determined.

  Then, the abnormality sign determination unit 304 determines whether each of the first to fourth conditions is satisfied at each determination timing. That is, for the first, third, and fourth conditions, when the gradual 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. Is determined, it is determined that the condition is satisfied. Then, based on a combination of conditions established among the first to fourth conditions, a sign of an unauthorized fall of the track circuit is determined. In the present embodiment, in addition to the first condition being satisfied, as an additional condition, when at least one of the second to fourth conditions is satisfied, an indication of an unauthorized 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 a sign of unauthorized fall of any track circuit. For example, the display device 322 can display a message indicating the track circuit that has determined the sign of unauthorized fall, the voice output device can output the message, and the lamp corresponding to the track circuit can be turned on. Furthermore, when a plurality of abnormal threshold values are set as threshold conditions, information indicating which abnormal threshold value the threshold condition is satisfied may be included and included as an indication level.

[Process flow]
FIG. 9 is a flowchart for explaining the flow of the track circuit monitoring process. This process is a process for determining an abnormality related to the unauthorized fall of each track circuit, and is executed by the processing device 300. However, measurement data is output from each measurement terminal 200 to the processing device 300 as needed. In the processing device 300, the measurement data storage unit 302 stores measurement data input from each measurement terminal 200 as measurement values as needed. Data 310 is stored / updated.

  In the track circuit monitoring process, when the determination timing determined at a predetermined interval has arrived (step S1: YES), the abnormality sign determination unit 304 sets a determination period that goes back by a predetermined period from the timing (step S1). S3).

  Next, loop A is repeatedly performed for each track circuit. That is, the abnormality sign determination unit 304 extracts measurement data during the determination period for the target track circuit from the measurement value accumulation 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 condition (step S7).

  Subsequently, based on these determination results, it is determined whether or not the target track circuit has an abnormality related to an unauthorized fall due to a weather change (in this embodiment, a sign of an unauthorized fall) (step S9). That is, for each condition item, it is determined whether or not the gradual decreasing tendency condition is satisfied or whether it is in a stable state depending on whether or not the changing condition is satisfied continuously for a predetermined number of times including the determination result of the current changing condition. In addition to the determination result of the threshold condition, it is determined whether the first to fourth conditions corresponding to the condition items are satisfied. And the presence or absence of a sign is determined by the combination of the conditions determined to satisfy. In this embodiment, in addition to the first condition, when at least one of the second to fourth conditions is satisfied, it is determined that there is a sign for the target track circuit. The process 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 unauthorized fall (step S11: YES), the notification control unit 306 performs a predetermined notification process for notifying the track circuit that has been determined to have a sign (step S11). S13). If the above process is performed, it will return to step S1 and the same process will be repeated.

[Function and effect]
As described above, according to the track circuit monitoring apparatus 100 of the present embodiment, the track circuit is illegally dropped based on the transmission current phase difference that is the phase difference of the transmission current with respect to the transmission voltage of the transmission transformer 7 that is the transmitter of the track circuit. It is possible to monitor abnormalities related to That is, when the transmission current phase difference satisfies the gradual decreasing tendency condition indicating that the transmission current phase difference gradually decreases with time, and the threshold condition indicating that the leakage conductance has increased to a value to be reported as abnormal In addition, it is determined that there is an abnormality related to the unauthorized fall of the track circuit due to weather changes. Further, as a further additional condition, an abnormality related to the unauthorized drop of the track circuit is determined based on the transmission voltage and transmission current, the received voltage phase difference that is the phase difference between the received voltage and the local voltage of the track relay 11, and the received voltage. You can also.

  It should be noted that embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can of course be changed as appropriate without departing from the spirit of the present invention.

  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 measuring terminal 202 transmission current phase difference calculation unit (calculation means)
204 Reception voltage phase difference calculation unit (reception side calculation means)
206 Transmission Control Unit 300 Processing Device 302 Measurement Data Storage Unit, 304 Abnormal Sign Determination Unit (Detection 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,
Calculating means for calculating a transmission current phase difference, which is a phase difference of the transmission current with respect to the transmission voltage, based on a measurement value measured by a transmission-side measuring device of the transmission voltage and transmission current of the transmitter of the AC track circuit; ,
Satisfying a predetermined gradual decreasing tendency condition indicating that the time change of the transmission current phase difference in a non-existing line where no presence line detection is performed by the AC track circuit is declining, and the transmission current phase difference is Detection that detects that a predetermined notification state relating to leakage current is in effect when a first condition that satisfies a predetermined threshold condition is satisfied when the leakage current from the AC track circuit exceeds a certain level due to being wet. Means,
Track circuit monitoring device 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 state of notification is in a corresponding stage depending on which of the threshold conditions of the plurality of stages is satisfied,
The track circuit monitoring apparatus according to claim 1. The detection means detects, as a further additional condition, that the transmission voltage and the transmission current are in the notification state when a second condition indicating that the transmission voltage and the transmission current are in a stable state is satisfied.
The track circuit monitoring apparatus according to claim 1 or 2. The received voltage phase difference, which is the phase difference of the received voltage with respect to the local voltage, based on the measured value measured by the receiving voltage measuring device and the local voltage receiving device of the track relay installed on the receiving side of the AC track circuit Receiving side calculating means for calculating
With
The detection means satisfies, as a further additional condition, a predetermined reception side gradual decrease tendency condition indicating that the time change of the reception voltage phase difference at the time of absence is gradual decrease, and the reception voltage phase difference is Detecting that the current state is in the notification state when a third condition that satisfies a predetermined reception threshold condition when the leakage current becomes a certain level or more is satisfied,
The track circuit monitoring apparatus according to any one of claims 1 to 3. The detection means satisfies, as a further additional condition, a predetermined reception voltage gradual decrease tendency condition indicating that the time change of the reception voltage is gradual decrease, and the reception voltage is equal to or greater than a certain level of the leakage current. When the fourth condition that satisfies the predetermined reception voltage threshold condition is satisfied, the notification state is detected.
The track circuit monitoring apparatus according to claim 4. The track circuit monitoring device according to claim 4 or 5, wherein a measurement terminal provided for each section boundary of the AC track circuit and a processing device having the detection unit are connected by communication,
The measuring terminal is
The calculating means for calculating the transmission current phase difference relating to the AC track circuit on the transmission side at the section boundary provided with the measurement terminal;
The receiving side calculating means for calculating the received voltage phase difference relating to the AC circuit on the receiving side at the section boundary provided with the measurement terminal;
Having
Track circuit monitoring device.

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