JPH09159716A - Lcx fault detecting method and equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply precisely detect the position of fault occurrence of crack, rupture, etc., and prevent communication fault. SOLUTION: A detection sensor 3 constituted of a loop antenna moves along an LCX cable 50, and outputs a detection level corresponding to a leakage magnetic field/electric field intensity. When fault such as crack and rupture exists in the LCX cable 50, the detection level in the fault part changes, so that a detection judgement part 6 of an equipment 1 compares the detection level at the time of measurement with a reference value, and defines the fault generation position. On the monitor image surface of a display output part 7, the detection level is displayed as a waveform with the measuring distance, and an alarm sound is generated at a fault generation part. On the monitor image surface, a marker is shown at the measuring distance position of the fault generation part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCX failure detection method and apparatus capable of detecting failures such as cracks and breaks in an LCX cable laid along a track as train radio equipment.

[0002]

2. Description of the Related Art An LCX cable is laid along a track, in which an electric current of a predetermined frequency is flowing, and is provided as a medium for wireless transmission / reception between a center and a traveling train. As shown in FIG. 9, the LCX cable 50 includes an inner conductor 51 and an outer conductor 52 which are coaxially arranged and covered with a coating 53 such as rubber. On the lower half surface of the outer conductor 52, slanted slots 52a are formed at predetermined intervals to form a leaky cable for transmitting and receiving radio waves.

A support wire 57 is provided along the upper portion of the slot 52a opposite to the slot 52a. The LCX cable 50 is fixed to a wall or suspended from a column with the slot 52a positioned below. For example, as shown, when fixed to a wall, the LCX cable 50
A holding metal fitting 58 for holding the outer periphery of the is used. The holding fitting 58 is made of an insulating material such as bakelite.

The LCX cable 50 has a large outer diameter,
And because the mass is small for the outer diameter,
When the train passes by, it vibrates due to wind pressure, and cracks 55 such as cracks and breaks are likely to occur on the side portions of the slots 52a of the outer conductor 52 depending on the magnitude of the vibration stress.

As a result, when the LCX cable 50 vibrates, the cracked portions 55 come into contact with or separate from each other, and radio noise is likely to occur. At the same time, the cable strength also decreases.

In the LCX cable 50, wireless repeaters are arranged in parallel at predetermined intervals (for example, 100 to 300 m), and a voltage detector is provided in the repeaters. The voltage detector measures the voltage level of the LCX cable, and when the voltage level falls below a predetermined voltage level, it outputs an alarm to the center through an alarm line, assuming that a failure such as a crack or break has occurred. There is.

[0007]

However, the failure of the LCX cable 50 detected by this repeater is only in the section where this repeater is provided, and the position of the failure occurrence can be specified. could not. For this reason,
Conventionally, the LCX cables in the entire section where a failure has occurred are replaced, and the work takes time and cost.

At present, it was not possible to find an early stage failure such as a small crack in the LCX cable 50. At present, it is extremely difficult to visually detect cracks in the outer conductor or the like in the outer coating. As the degree of the obstacle progresses, not only the electric field fluctuation but also the train radio may stop in the worst case.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to accurately and easily detect the position of the occurrence of a failure such as a crack or a break in the initial stage, and to prevent communication failure in advance. An object is to provide a detection method and device.

[0010]

In order to achieve the above object, the LCX cable fault detection method of the present invention detects a fault location such as a crack or a break in an LCX cable (50) laid along a train track. An LCX failure detection method for detecting, wherein a detection level corresponding to a magnetic field / electric field intensity leaking from the LCX cable at a location where a repeater of the LCX cable is provided is measured by a detection sensor (3) and an initial value level is detected. After that, the detection level is measured at every predetermined timing while moving the detection sensor along the LCX cable, and the measurement position when the difference from the previously measured detection level exceeds a predetermined range value set in advance LC
The feature is that it is notified as a failure occurrence point of the X cable.

Further, the LCX cable fault detection apparatus of the present invention is an LCX cable (5
LCX that detects faults such as cracks and breaks in 0)
A failure detection device, which detects a detection level (3) that is moved along the LCX cable and outputs a detection level corresponding to a magnetic field / electric field strength leaked from the LCX cable, and a detection level output from the detection sensor. A device main body (1) that determines the occurrence of a fault in the LCX cable on the basis of a difference from a reference value obtained from a previously measured detection level at a predetermined timing, and an output provided from the detection sensor provided in the device main body (1). And a display output unit (7) for displaying the detected level in a waveform or numerical value and for notifying and outputting the occurrence of a failure.

[0012] Further, as described in claim 3, the LCX cable (5
The detection determination unit (6) for setting and storing the detection level output from the detection sensor (3) as an initial value at the location where the repeater of (0) is provided is provided.
When the measurement for the LCX cable has been performed in the past, the past initial value of the measurement start point of the LCX cable is read and set, and when the past data is not stored, the detection sensor outputs a plurality of times. A configuration may be adopted in which the level is set and stored as a new initial value only when all the levels match the theoretical value corresponding to the output of the repeater, and the initial value is used as the reference value, and the measurement starts.

Further, according to a fourth aspect of the present invention, the LCX cable (5
(0) is provided with a detection determination unit (6) that captures and stores the detection level output from the detection sensor (3) at a predetermined timing at a position where the repeater is provided. The value and the average value of the current detection level may be stored as a new reference value, and the reference value may be updated and stored each time the detection level is captured.

Further, as described in claim 5, the detection judging section (6) sets a predetermined range value centered on the reference value, and the detection level at the time of measurement is within the predetermined range value. It is also possible to adopt a configuration in which the normal position is set, and the measurement position when the predetermined range value is exceeded is determined as the failure occurrence point of the LCX cable (50).

Further, as described in claim 6, the display output unit (7), based on the information on the detection level and the movement position of the detection sensor (3), the LCX cable (50).
The detection level at each position with respect to the measurement distance may be displayed as a waveform.

Further, as described in claim 7, the detection sensor (3) is composed of a loop antenna (3a) for receiving a magnetic field / electric field intensity leaking from an LCX cable, and the loop antenna has the LCX. An engaging member (36) that engages with the cable (50) may be provided so as to be movable while being in contact with the LCX cable.

Further, as described in claim 8, the detection sensor (3) is provided with a sliding member (3d) such as a tire and a traveling drive source, and is self-propelled along the LCX cable (50). It can also be configured.

According to the above configuration, the magnetic field / electric field strength leaking from the LCX cable 50 is output from the detection sensor 3 at the detection level. If the LCX cable 50 has cracks or breaks, leakage increases and the detection level increases. The detection determination unit 6 of the apparatus body 1 sets the detection level of the portion where the repeater is provided as an initial value, and while moving the detection sensor 3, a predetermined range in which a difference from the detection level at the previous measurement is predetermined. When the value exceeds the value, the display output unit 7 informs that the LCX cable 50 has a failure. The operator should check the LCX cable 5 at the measurement position when it is surrounded.
0 It can be judged that there are obstacles such as cracks and fractures inside the
Replace the CX cable 50.

[0019]

1 is a block diagram showing the configuration of an LCX cable fault detection device according to the present invention. The device body 1 of this failure detection device has a shoulder belt, is sized to be carried by an operator, and operates by being supplied to each part by a power source 2 such as a built-in battery as a drive source. To do. The failure of the LCX cable 50 described above
It is detected by the detection sensor 3 which is close to the LCX cable 50.

The detection signal of the detection sensor 3 is input to the receiving section 5 and receives the level of the magnetic field / electric field strength. The detection determination unit 6 determines the LCX cable 5 based on this detection level.
Cracks and breaks, which are obstacles of 0, are judged. The detection determination unit 6 is configured by using a general-purpose control processing unit such as a CPU and a storage unit, and performs the above determination by sequentially executing a predetermined process described below. Display output unit 7
Has a monitor screen, and the numerical value and the waveform of the determination result are output to this monitor screen, and at the time of failure determination, an alarm sound by a buzzer or the like and a notification output by a marker on the monitor screen are output. The operation unit 8 has a keyboard function for operating the apparatus.

The measurement data of the detection signal is output to the printer output unit 10 externally attached via the interface unit 9 or the external storage unit 11 such as a floppy disk device, and the measurement data is printed and saved. Also, past measurement data can be read from the external storage unit 11.

The detection sensor 3 is composed of, for example, a loop antenna 3a shown in the side view of FIG. The magnetic field / electric field intensity leaking from the LCX cable 50 is detected and output by bringing this loop antenna 3a portion into contact with the LCX cable 50 and moving it in the axial direction.

Therefore, the loop antenna 3a has an LC
A hook 3b as an engaging member is provided on the upper part so that the hook 3b is always in contact with the X cable 50.
Support wire 57 provided along the top of cable 50
It has a shape that catches on the part. Further, the loop antenna 3a is provided with sliding members 3d such as tires and spherical rollers above and below the surface on the LCX cable 50 side, respectively, so that the loop antenna 3a can smoothly move along the LCX cable 50. The sliding member 3d is configured to be movable in the direction of the LCX cable 50 by being biased by a spring or the like so that the sliding member 3d can easily get over.

The movement of the loop antenna 3a is performed manually or automatically. In the manual mode, a supporting rod 3f whose angle can be freely changed is provided through a joint 3e at the base end of the loop antenna 3a. An operator sets the supporting rod 3f at an angle that is easy to operate and holds the LCX cable while holding it by hand. Walk along 50.

In order to move automatically, a drive motor, which is a traveling drive source, is provided in the loop antenna 3a portion.
The drive motor is provided with an operation switch so that it can be started / stopped on the device 1 side. In this self-propelled configuration,
It is also possible to adopt a configuration in which a range finder attached to the drive motor outputs distance information to the failure detection device 1.

As for the obstacle of the LCX cable 50, as shown in the waveform diagram of FIG. 3, the detection level of the obstacle portion projects according to the state of cracks or breaks. The waveform shown in FIG. 3 is a state in which the detection level at a distance of approximately one section (between repeaters) is displayed in the display form of the display output unit 7, and it is assumed that there are multiple obstacles in this one section. The display of the case is shown. In this figure, the vertical axis is the detection level and the horizontal axis is the distance.

In the figure, the normal and intact part of the LCX cable 50 has a normal level detection level (approximately 70 dB) corresponding to a predetermined voltage supplied from the repeater, but each of ~ is the LCX cable. The location where the outer conductor 52 of 50 is damaged is shown. For example,
2 mm wide wound over 1/4 circle, 3/4 is 2 mm wide
The wound around the circumference is a wound with a width of 0.5 mm and extends over the 3/4 circumference, and the leakage from the LCX cable 50 becomes large at any of the wound locations described in (1) to (3) above. The level protrudes in a larger direction than the normal value (intact part).

Further, ~ are the positions where the holding metal fittings 58 of the LCX cable 50 are respectively provided, and the holding metal fittings 58 of the, are the support wires 5 on the upper part of the LCX cable 50.
Since the holding metal fitting 58 holds only the seven parts and holds the outer circumference of the LCX cable 50 described above, the leakage state is different, but in any of the locations 1 to 3 where the holding metal fitting 58 is provided, LCX cable 5
Since the leakage from 0 becomes small, the detection level projects in a direction smaller than the normal value.

Next, the fault detection operation with the above configuration will be described. FIG. 4 is a flowchart showing the operation of the failure detection device 1, and particularly describes the failure detection method by the execution processing of the detection determination unit 6. After the device is powered on,
Measurement, printing, or end is selected according to the menu selection displayed on the display screen of the display output unit 7 (SP1). When measuring, first select whether to change the measurement conditions (SP
2). Measurement conditions include temperature, humidity, start distance, absolute distance, measurement section, distance (movement data), cable type,
There are manual / automatic measurement and the like, and when the contents set in the device 1 are changed, new measurement conditions are input from the operation unit 8 (SP3).

Next, when execution of measurement is selected (SP4), at the start of measurement, first, data of the detection level of the detection sensor 3 is taken in to set the initial level of the starting point (SP5). The details of the initial level setting method shown in SP5 are shown in the flowchart of FIG. Explaining based on FIG. 5, it is searched whether or not the section in which the measurement is to be started has been measured in the past (SP3).
0).

When data is stored in the detection determination section 6 at the start of the measurement, the operator of the apparatus 1 operates the operation section 8 to input the section number corresponding to the measurement section. File is searched (SP30-Yes),
The read level of the past measurement start point is set as the reference value of the initial level, and at the same time, the read measurement range value and the up / down information are also set (SP31). And
If there is past data, after executing this SP31,
Move to SP5.

The above-mentioned measurement range value indicates an error range when determining a fault of the detection level when measured in the past, and the fault determination based on the detection level at the time of measurement that fluctuates due to noise or the like is within this error range. Is used to determine that a failure has occurred when the value is out of the normal range. That is, this measurement range value is set in correspondence with the fact that the noise generation state differs depending on the type of cable and the like. For example, the detection level serving as the reference for the measurement start point is about 70 dB in the above-mentioned example, and the measurement range value is set as 5 dB above and below this detection level, and the normal values are within the measurement range values above and below the detection level. Become.

Since the LCX cable 50 has a predetermined resistance value due to its material, etc., even if one repeater has a detection level of 70 dB in one section, the detection level at the other repeater is, for example, It has the characteristic of being attenuated to 40 dB. Therefore, depending on the moving direction at the time of measurement, either the down direction in which the detection level gradually decreases in accordance with this moving direction or the up direction in which the detection level gradually increases. The uplink / downlink information is data indicating this measurement direction. FIG. 6 is a diagram showing the attenuation characteristic of the LCX cable 50 in the down direction. In the figure, the vertical axis represents the detection level and the horizontal axis represents the absolute distance.

When there is no past data (SP30-No), the initial level setting operation is executed. First, the detection level at this measurement start point is measured (S
P32), this detection level is stored (SP33). Next, it is determined whether or not this detection level is a normal value that matches the theoretical value (SP34). The theoretical value corresponds to the detection level corresponding to the predetermined voltage supplied from the repeater at the measurement starting point. The theoretical value of the detection level is selected to be, for example, 70 dB when the moving direction is up, and 40 dB when the moving direction is down, and a measurement range value (for example ±
It is determined that the normal value is within the range of 5 dB.

Since the detection level at the measurement starting point is used as a reference value for subsequent measurement, it is necessary to set it to an accurate value that eliminates the influence of noise and the like. Therefore, it is determined whether or not a predetermined number of consecutive times matches the theoretical value, and for example, as shown in SP35 and SP36, it is determined whether or not the detection level falls within the measurement range of the theoretical value ten times in a row. To be done. When the measured value is within the measurement range centered on the theoretical value 10 times in a row, the detection level for 10 times is read from the storage unit, the average value is calculated, and the average value is used as a reference initial level. (SP37).
After this, the process proceeds to SP6.

In SP34, when the initial level is not within the measurement range value centered on the theoretical value, the LCX cable 50 has a fault at the measurement start point, or the device 1 is erroneously operated or the setting is inadequate. Therefore, first, on the premise of erroneous operation, the attenuator of the receiving unit 5 is changed to automatically adjust the sensitivity of the detection level (SP4
0). In this sensitivity adjustment, the sensitivity is varied by a predetermined amount in the relative direction depending on whether the detection level is larger or smaller than the theoretical value to bring the detection level closer to the theoretical value direction.

At the time of this nonconformity, a loop counter is used, and it is determined whether or not the theoretical value is conformed by a predetermined loop count. First, at the time of non-conformity, this loop counter is cleared to 0 (SP41), and the current detection level stored in the storage unit is cleared (SP4).
2). For example, as shown in SP43 and SP44, it is determined whether or not the number of loops is within the theoretical value measurement range before the detection level continues five times. If the detection level falls within the theoretical value measurement range by 5 consecutive times, then the determination of SP34 does not branch to the loop count processing of SP40 and subsequent steps, and the measurement start point reference of SP35 and subsequent steps is used. It is possible to move to the process of setting the initial level.

However, when the detection level does not fall within the theoretical measurement range even after the sensitivity adjustment is performed five times in succession, it is not only due to an erroneous operation of the device 1 or a setting error, but also the automatic initial value setting of the device 1 is performed. Since it cannot be performed, error output such as error display is performed from the display output unit 7 (SP4
5). At this time, the loop count is cleared to 0, and the device 1 shifts to the SP1 menu display. The cause at this time is that there is a high possibility that a failure will occur on the LCX cable 50 side, and in any case, the operator's judgment is required.

The device 1 automatically performs the initial level setting process shown in FIG. Next, device 1
Starts measurement (SP6 in FIG. 4). At the start of measurement, the operator carries the device 1, and when the detection sensor 3 is manually moved, the detection sensor 3 is moved along the LCX cable 50. The movement is about 4k when the operator walks
It is about m / h.

After the start of measurement, the receiving section 5 samples the detection level 3 to 4 per second and continues to capture it. Detection determination unit 6
Stores the fetched detection level in the storage unit and compares the difference with the previous detection level (SP7). This comparison determines normal / abnormal by whether the detection level is within the measurement range value of the previous detection level. When the detection level is normal within the measurement range value (SP7-Yes), the average value with the detection level at the previous measurement stored in the storage unit is calculated (SP
8) Then, this average value is stored in the measurement data storage unit as a measurement value (SP9). Therefore, strictly speaking, the previous detection level refers to this average value. Further, at the start of measurement, the value corresponding to the detection level at the previous measurement is the initial value.

As a result, since the detection level measured this time is compared with the average value of the detection levels measured in the past, it becomes possible to make an accurate failure determination without the influence of noise or the like. Further, even if there is attenuation due to the up / down, the average value itself, which is the reference, is updated for each sampling, so the reference value (average value) is used for the slope of this attenuation.
Can be adapted.

The measured values stored in the measured data storage unit at SP9 are simultaneously displayed as waveforms on the monitor screen of the display output unit 7. In this waveform display, the measurement data from the start of measurement to the moved position is displayed. Then, this measurement is performed until a measurement end operation is performed on the device 1 (SP10-Yes), and usually continuous measurement is performed for one section (for example, 100 m).
The processing of P6 to SP9 is repeated. During this time, the moving operator inputs the distance information into the apparatus 1 each time the predetermined distance is reached. As a result, the moving distance taken when the detection level is measured a predetermined number of times is input, and the measurement data has a plurality of detection levels distributed in the moving distance. In addition, during automatic measurement when the detection sensor 3 is self-propelled,
The distance information output from the rangefinder is captured as the movement distance.

Then, in the comparison of SP7, if the detection level deviates from the measurement range value of the previous detection level (measurement range value centered on the average value), it is determined as abnormal (S
P7-No), a notification is displayed on the monitor screen of the display output unit 7 (SP11), and an alarm sound is emitted by a buzzer or the like if necessary (SP12).

In the abnormal waveform, as shown in FIG. 3, the detection level is prominent depending on the degree of occurrence of obstacles 1 to 3, that is, the size of the flaw. As shown in this waveform diagram, even when a flaw with a minimum width of 0.5 mm and a circumference of 1/2 circle occurs, this can be detected. As a result, it becomes possible to detect the failure at an early stage, and it is possible to prevent the communication failure of the train radio equipment. In addition, as shown in the abnormal waveform diagram of FIG. 7, when the outer conductor 52 of the LCX cable 50 at the position indicated by the arrow A is completely disconnected, the leakage is extremely large. It projects in the direction of higher detection level. The horizontal axis of the figure is enlarged and displayed by the enlargement function of the display output unit 7. Further, a marker 20 corresponding to the notification display of the SP 11 is displayed at the location of the failure outside the waveform display frame in FIG. 7.

Further, as shown in the waveform diagram at the time of abnormality in FIG. 8, the inner conductor 5 of the LCX cable 50 at the position of the arrow B is shown.
When 1 is completely disconnected, the detection level after this fault occurrence position is extremely lowered. This is a waveform that is clearly different from the local decrease in the detection level due to the holding metal fitting 58, and the marker 20 is also notified and displayed at the location of the failure.

The operator can immediately recognize the abnormality when the detection sensor 3 approaches the location where the failure has occurred, by the waveform state of the display output section 7 and the marker display, and further by the alarm sound notification function. It becomes possible to accurately specify the location of the failure. The LCX cable 50 that has been able to identify the location of the failure is cut within a range of 50 cm to 2 m before and after with the location of the failure as the center, and a new alternative LCX cable 50 is connected to the cutting location via a dedicated connector. It has become so. This disconnection and connection work can be performed even after performing the measurement work on the LCX cable 50 in one section. For this reason,
It is also effective to mark the location of failure during measurement.

The measurement data stored in the measurement data storage section can be displayed on the display output section 7 and reproduced even after the measurement. For example, when print is selected in the menu display in SP1 of FIG. 4, a graph or numerical value can be displayed by selecting the print type (SP15). The graph display displays the waveform and the numerical display displays the measurement data. Also,
The device 1 can be connected to the printer output unit 10 to output the measurement data to the outside, the graph and the numerical value display similar to the above can be performed, and the measurement data can be output to the external storage unit 11 to save the data. Perform analysis work.

In the analysis of the measurement data, it is possible to analyze whether the external conductor 52 or the internal conductor 51 is an obstacle, depending on the protruding value and the protruding range of the detection level at the fault location, and the detection level value. It is possible to know the degree of the failure based on the magnitude of, and in any case, it is possible to specify the location of the failure position. This analysis may be performed using another analysis device.

In the above embodiment, the loop antenna 3a is used as the detection sensor 3, but the structure is described.
Alternatively, a dipole antenna may be used, and the dipole antenna may be oriented along the axial direction of the LCX cable 50. In addition, the detection sensor 3
Has been described as a configuration in which the LCX cable 50 is moved while being in contact with it, but a configuration in which the LCX cable 50 is moved at a position away from the LCX cable 50 by a predetermined distance may be used. However,
Since the detection level of the detection sensor 3 changes depending on the distance to the LCX cable 50, the distance from the LCX cable 50 needs to be always constant.

[0050]

According to the LCX cable failure detection method of the first aspect, the position where the detection level is projected is notified as the failure occurrence position during the measurement by moving the detection sensor along the LCX cable. Then, the operator can determine that there is a failure such as a crack or a break inside the LCX cable at the measurement position that receives the notification, and can accurately specify the failure occurrence location. If this failure occurrence point can be specified, only this failure occurrence point can be partially replaced without replacing the LCX cable for the entire one section, and the replacement work can be performed very easily. And, it becomes possible to prevent the train radio communication failure from occurring.

According to another aspect of the LCX cable fault detection device of the present invention, the detection level of the device main body during measurement by moving the detection sensor along the LCX cable is displayed and output as a waveform on the display output unit. Therefore, it is possible to easily determine the protruding position of the detection level as the failure occurrence position. Further, when a failure occurs, the location of the failure can be easily specified by the notification output.

If the initial value at the start of measurement can be automatically set as described in claim 3, operation setting work by the user of the apparatus is unnecessary, and erroneous setting is prevented at the same time. It becomes possible to improve the measurement accuracy of. Further, as described in claim 4, the reference value for determining the occurrence of a failure is an average value with the detection level at the previous measurement, and the average value is stored as the reference value and measured. Since the average value of the reference value and the measured detection level is updated and stored for each time, it is possible to highly accurately determine the failure occurrence location corresponding to the attenuation characteristics that differ depending on whether the LCX cable goes up or down. Like
Further, as described in claim 5, a predetermined range value is set around the reference value, and when the predetermined range value is exceeded, it is determined that a failure has occurred. However, it is possible to prevent an erroneous determination without determining that this is an immediate failure occurrence.

Further, as described in claim 6, when the detection level is displayed as a waveform corresponding to each measurement distance during the measurement while moving, the fluctuation of the measured detection level You can easily see how well
It becomes possible to grasp the degree of the failure near the failure occurrence point. At locations where the detection level increases on this waveform, the outer conductor cracks or breaks corresponding to the amount of protrusion, and at locations where the detection level drops significantly, cracks or breaks in the inner conductor occur. It is highly possible that

If the loop antenna constituting the detection sensor moves while contacting the LCX cable by the engaging member as described in claim 7, this movement operation can be performed easily, and the fluctuation of the detection level can be achieved. Can be prevented, and the measurement can be performed stably. Further, as described in claim 8, when the detection sensor is configured to be self-propelled by the sliding member and the traveling drive source, it is possible to easily perform the measurement without moving the detection sensor with respect to the LCX cable over a long distance. In addition, stable measurement can be performed regardless of the location of the LCX cable.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an LCX failure detection device of the present invention.

FIG. 2 is a side view showing a detection sensor.

FIG. 3 is a waveform diagram showing a fault position and a degree of the LCX cable.

FIG. 4 is a flowchart showing a failure detection operation.

FIG. 5 is a flowchart showing an initial value setting operation.

FIG. 6 is a waveform diagram showing the attenuation characteristics of the LCX cable.

FIG. 7 is an enlarged waveform diagram of a location where a failure has occurred with respect to an external conductor.

FIG. 8 is an enlarged waveform diagram of a location where a failure has occurred in the internal conductor.

FIG. 9 is a diagram showing a structure of an LCX cable.

[Explanation of symbols]

1 ... failure detection device, 2 ... power supply, 3 ... detection sensor, 3a ...
Loop antenna, 3b ... Hook, 3e ... Joint, 3d ... Sliding member, 3f ... Support rod, 5 ... Reception part, 6 ... Detection determination part,
7 ... Display output unit, 8 ... Operation unit, 9 ... Interface unit, 10 ... Printer output unit, 11 ... External storage unit, 50 ...
LCX cable, 51 ... inner conductor, 52 ... outer conductor, 5
2a ... Slit, 57 ... Support wire, 58 ... Holding metal fitting.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaru Igarashi 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Inside East Japan Railway Company (72) Inventor Hitoshi Takafuji 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Railway Company (72) Inventor Shoichi Watanabe 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Hirate Cable Co., Ltd. (72) Kohei Tasumi 5-chome, Hidaka-cho, Hitachi, Ibaraki No. 1 Hitachi Cable Co., Ltd. Hidaka Plant (72) Inventor Toshio Nohara 4-16-21 Nakamachi, Atsugi-shi, Kanagawa Promity Atsugi Building 7F Anritsu Engineering Co., Ltd. (72) Inventor Tetsuya Nakanishi Kanagawa 4-16-21 Nakamachi, Atsugi-shi, Japan Promity Atsugi Building 7F Anritsu Engineering Co., Ltd.

Claims (8)

[Claims] 1. An LCX failure detection method for detecting a failure location such as a crack or a break in an LCX cable (50) laid along a train track, wherein a location where a repeater for the LCX cable is provided. After the detection level corresponding to the magnetic field / electric field strength leaked from the LCX cable in (1) is measured by the detection sensor (3) and set to the initial value level, the detection sensor is moved along the LCX cable at every predetermined timing. An LCX failure detection method, characterized in that the detection level is measured, and when the difference from the previously measured detection level exceeds a predetermined range value, the measurement position is notified as the failure occurrence point of the LCX cable. 2. An LCX fault detection device for detecting a fault location such as a crack or a break in an LCX cable (50) laid along a train track, which is moved along the LCX cable and is an LCX cable. A detection sensor (3) that outputs a detection level corresponding to the strength of the magnetic field / electric field leaking from the sensor, and a reference value obtained from the detection level measured last time by capturing the detection level output from the detection sensor at a predetermined timing. An apparatus main body (1) that determines the occurrence of a failure of the LCX cable based on the difference, and a detection level output from the detection sensor provided in the apparatus main body is displayed in a waveform or numerical value. An LCX failure detection device, comprising: a display output unit (7) for outputting a notification. 3. The detection level output from the detection sensor (3) at a location where a repeater of the LCX cable (50) is provided at the start of measurement is set and stored in the apparatus body (1) as an initial value. A detection determination unit (6) for performing, when the measurement for the LCX cable has been performed in the past, the detection determination unit reads and sets the past initial value of the measurement start point of the LCX cable, When the past data is not held, it is set and stored as a new initial value only when all of the detection levels output by the detection sensor a plurality of times match the theoretical value corresponding to the repeater output, and the initial value is stored. The LCX failure detection device according to claim 2, wherein the LCX failure detection device is configured to be used as the reference value and to shift to measurement start. 4. The detection level output from the detection sensor (3) at a location where a repeater of the LCX cable (50) is provided after the start of measurement is taken into the apparatus main body (1) at predetermined timings. A detection determination unit (6) for storing is provided, and the detection determination unit stores the average value of the reference value and the current detection level as a new reference value, and the reference value is set every time the detection level is captured. 3. A configuration in which the data is updated and stored in
The described LCX failure detection device. 5. The detection determination unit (6) sets a predetermined range value centered on the reference value, and when the detection level at the time of measurement is within the predetermined range value, normalizes the predetermined range value. 5. The LCX failure detection device according to claim 4, wherein the measurement position when the LCX cable is crossed is determined to be a failure occurrence point of the LCX cable (50). 6. The display output unit (7) waveform-displays the detection level at each position with respect to the measurement distance of the LCX cable (50) based on the detection level of the detection sensor (3) and information on the moving position. The LCX failure detection device according to claim 2, which is configured to: 7. The detection sensor (3) comprises a loop antenna (3a) for receiving a magnetic field / electric field strength leaking from the LCX cable, and the loop antenna is engaged with the LCX cable (50). The LCX failure detection device according to claim 2, wherein an engagement member (36) is provided so as to be movable while being in contact with the LCX cable. 8. The detection sensor (3) is provided with a sliding member (3d) such as a tire and a traveling drive source, and the LC
The LCX failure detection device according to claim 7, wherein the LCX failure detection device is configured to be self-propelled along the X cable (50).