JP2016011067A - Signal current measuring instrument for dc track circuit, and short-circuiting part identification method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal current measuring instrument for a DC track circuit capable of measuring a signal current that is a DC current, at each of measuring points while moving over an entire insulated rail (block section) in the DC track circuit, and a signal current measuring method.SOLUTION: A signal current measuring instrument 100 for measuring the signal current that is a DC signal of the DC track circuit, includes: a traveling part 1 which is placed on a rail step surface so as to be movable in a length direction of the rail; two contacts 2 which are provided while interposing a predetermined interval therebetween in a length direction of the traveling part and brought into contact with the rail for detecting a potential difference between the contact portions; and a signal processing part 3 for calculating and displaying a value of the signal current on the basis of the potential difference detected by the two contacts 2.

Description

  The present invention relates to a signal current measuring device for a DC track circuit used in a non-electrified section and a method for identifying a short circuit location using the signal current measuring device.

  The DC track circuit used in the non-electrified section flows the DC current rectified by the rectifier from the transmission side to the insulated rail (blocking section) as a signal current and inputs it to the track relay on the reception side for insulation The rail is short-circuited by the train wheel that is on the rail (blocked section), and the signal current does not flow to the track relay, so the status of the train is detected and the traffic light is turned off (red signal) Thus, the other trains are prohibited from traveling to the insulated rail (blocked section) to prevent rear-end collision or frontal collision of the train.

  In such a DC track circuit, when a rail short circuit due to heavy rain, a rail short circuit due to metal or a conductive member, a short circuit due to dielectric breakdown, etc. occurs, the train is not present The traffic light becomes a stop indication (red light), and the train cannot travel to the insulated rail (blocked section). For this reason, it is necessary to specify the short-circuit location and measure the signal current flowing through the rail in order to eliminate the track short-circuit failure.

  However, such a DC track circuit has a simple equipment configuration and is not easily broken, and is introduced only in a limited area such as a non-electrified section, and measures a signal current that is a DC current flowing in a rail. There was no request for a measuring instrument, and the measuring instrument did not exist.

  On the other hand, in the widely used AC track circuit, in order to measure the signal current which is an AC current, two current detectors capable of measuring the AC current in a non-contact manner are provided. A current measuring device capable of moving and measuring a signal current simultaneously and smoothly for both running rails is disclosed (for example, see Patent Document 1).

  In addition, the DC railway feeder circuit is equipped with magnetic field detection means for detecting the change of the magnetic field due to the return current flowing in the rail in order to measure the return current that is the DC current flowing in the rail, and the equipment is enlarged. There is disclosed a rail direct current detection device that can easily detect a retrace current without the need (see, for example, Patent Document 2).

JP 2010-234875 A JP 2007-153255 A

However, the prior art of Patent Document 1 measures a signal current that is an AC current in an AC track circuit, and cannot measure a signal current that is a DC current in a DC track circuit.
In the prior art of Patent Document 2, the return current, which is a direct current flowing in the rail, is measured. However, in a DC railway feeder circuit, the return current, which is a direct current, becomes a hindrance to a signal current and becomes a direct current track. While the circuit cannot be used, the return current is several hundred A to several thousand A, whereas the signal current of the DC track circuit is about several A, and the signal current of the DC track circuit is the return current and Since it is extremely small in comparison, there is a problem that the prior art of Patent Document 2 cannot be directly applied to the measurement of the signal current of the DC track circuit.
Although it is possible to measure the signal current (DC current) flowing in the rail by winding the coil around the rail of the DC track circuit and detecting the change in the magnetic field, the coil is wound around the rail. It is difficult to move and it is difficult to measure the signal current (DC current) at each measurement point while moving over the entire insulated rail (blocking section) in order to identify the short-circuit location in the track short-circuit fault. There was a problem.

  An object of the present invention is to provide a signal current measuring device for a DC track circuit capable of measuring a signal current as a DC current at each measurement point while moving over the entire insulated rail (blocking section) in the DC track circuit. And it is providing the short-circuit location identification method using a signal current measuring device.

In order to achieve the above object, the present invention provides:
In a current measuring device that measures a signal current that is a DC signal of a DC track circuit,
A traveling unit placed on the rail tread so as to be movable along the longitudinal direction of the rail;
Two contactors provided at predetermined intervals in the longitudinal direction of the traveling portion and in contact with the rail to detect a potential difference of the contact portion;
A signal processing unit that calculates and displays the value of the signal current based on the potential difference detected by the two contacts;
Is provided.

  The traveling part placed on the rail tread is moved to each measuring point while moving along the longitudinal direction of the rail, and the value of the signal current (DC current) is calculated based on the potential difference detected by the two contacts. By displaying, in the DC track circuit, it is possible to measure a signal current which is a DC current at each measurement point while moving over the entire insulated rail (blocking section). Moreover, a short circuit location can be specified based on the value of the measured signal current at each measurement point.

Preferably, the signal processing unit includes a filter for attenuating a frequency component of an alternating current flowing while being superimposed on the rail.
Since the AC current such as the current of the railroad crossing controller that causes an obstacle to the measurement of the value of the signal current can be removed by the filter, the value of the signal current can be measured more accurately.

Preferably, the predetermined interval between the two contacts is made variable.
By increasing the predetermined interval between the two contacts, the value of the measured potential difference is increased, so that the measurement sensitivity can be improved. When specifying the short-circuited portion, the signal current is higher than the measurement sensitivity. Therefore, it is possible to specify the short-circuit location more finely by narrowing the predetermined interval between the two contacts.

Preferably, the signal processing unit calculates the value of the signal current using a different constant depending on the type of the rail.
Since the resistance value that is a constant varies depending on the type of rail, the value of the signal current can be measured more accurately by calculating the value of the signal current using the corresponding resistance value according to the type of rail. .

Desirably, the contact is configured by a brush-like member that can polish the rail tread surface and has conductivity.
By making the contact a brush-like member capable of polishing the rail tread and having conductivity, even if the rail tread is rusted, the rail tread is polished along with the movement of the running part. The contact between the contact and the rail tread can be reliably ensured at the measurement point, and the value of the signal current can be measured more accurately.

Desirably, the contact is composed of two brush-like members.
Even if the rail is provided with a cant (in the curved portion of the rail, the outer rail or the road surface is made higher than the inner side) by configuring the contact from two brush-like members, Since the member can easily contact the rail tread and the rail tread can be evenly polished, the contact between the contact and the rail tread can be reliably ensured at the measurement point, and the value of the signal current can be more accurately measured. Can be measured.

Desirably, an urging portion that presses the contact against the rail tread is provided.
By pressing the contact against the rail tread by the urging portion, the contact between the contact and the rail tread can be ensured at the measurement point, and the value of the signal current can be measured more accurately.

In addition, other inventions of the present application are:
A short-circuit location identifying method for measuring a signal current that is a DC signal of a DC track circuit and identifying a short-circuit location,
A step of placing a traveling part movable along the longitudinal direction of the rail on the rail tread and moving to each measurement point;
At each measurement point, two contactors provided at a predetermined interval in the longitudinal direction of the traveling unit and contacting the rail detect a potential difference between the contact parts;
The signal processing unit calculates and displays the value of the signal current based on the potential difference detected by the two contacts, and the measurement point where the signal current can be measured and the measurement where the signal current cannot be measured Identifying and displaying that there is a short-circuited point between the point,
Is included.

  The traveling part is placed on the rail tread and moved to each measurement point. At each measurement point, two contactors provided at predetermined intervals in the longitudinal direction of the traveling part and contacting the rail are connected to the contact part. The potential difference was detected, and the signal processing unit calculated and displayed the value of the signal current based on the potential difference detected by the two contacts, and the measurement point where the signal current could be measured and the signal current could not be measured. By specifying and displaying that there is a short-circuited point between the measurement points, the short-circuited point can be specified based on the value of the signal current measured at each measurement point.

According to the present invention, in a current measuring device that measures a signal current that is a DC signal of a DC track circuit, a traveling unit that is placed on a rail tread so as to be movable along the longitudinal direction of the rail, and a longitudinal direction of the traveling unit Two contactors for detecting a potential difference between the contact portions by contacting the rail provided at a predetermined interval and a signal current value calculated based on the potential difference detected by the two contactors and displayed. A signal processing unit that moves the traveling unit placed on the rail tread surface to each measurement point along the rail longitudinal direction, and based on the potential difference detected by the two contacts, the signal current ( Since the value of (DC current) can be calculated and displayed, the signal current, which is DC current, can be measured at each measurement point while moving over the entire insulated rail (blocking section) in the DC track circuit.
In addition, the traveling unit is placed on the rail tread and moved to each measurement point, and at each measurement point, the traveling part is provided at a predetermined interval in the longitudinal direction and is brought into contact with the rail so that the potential difference of the contact portion is increased. The two contacts for detection detect the potential difference between the contact portions, and the signal processing unit calculates and displays the value of the signal current based on the potential difference detected by the two contacts, and the signal current is By identifying and displaying that there is a short-circuited point between the measurement point at which measurement was possible and the measurement point at which signal current could not be measured, the short-circuited point was determined based on the measured signal current value at each measurement point. Can be identified.

It is a schematic block diagram which shows an example of a structure of the signal current measuring device of the DC track circuit which concerns on this Embodiment. It is explanatory drawing explaining the relationship between the traveling part of FIG. 1, a contactor, and a rail. It is explanatory drawing explaining the identification method of the short circuit location by the signal current measuring device of the DC track circuit which concerns on this Embodiment. It is explanatory drawing explaining the identification method of the short circuit location by the signal current measuring device of the DC track circuit which concerns on this Embodiment. It is a schematic block diagram which shows an example of a structure of the signal current measuring device of the DC track circuit which concerns on 2nd Embodiment. It is a schematic block diagram which shows an example of a structure of the signal current measuring device of the DC track circuit which concerns on 3rd Embodiment.

(Embodiment)
[1. Description of configuration]
Hereinafter, a signal current measuring device for a DC track circuit and a method for identifying a short circuit using the signal current measuring device according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

A configuration of a signal current measuring device for a DC track circuit according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic configuration diagram (a front view and a side view) showing a configuration of a signal current measuring device 100 of a DC track circuit.
The traveling unit 1 is placed on the rail tread TP21 of the laid rail RL21. In addition, the traveling unit 1 includes a guide GD11 that is configured to support the side surfaces of the rail RL21 on both sides in the short-side direction, and is configured by a rotatable roller or the like. It can move along the longitudinal direction of the rail RL21 without detaching from the rail RL21.

  The contacts 2 are provided at both ends of the traveling unit 1 in the longitudinal direction. When the traveling unit 1 is placed on the rail RL21, the contactor 2 contacts the rail tread surface TP21 at a predetermined interval, and detects a potential difference at the contact portion. It is a member having conductivity. Further, in the non-electrified section where the DC track circuit is used, the number of trains is small and the rail tread surface TP21 may be rusted. You may comprise by the brush-shaped member which has electroconductivity so that tread surface TP21 can be grind | polished.

The signal processing unit 3 includes a display unit such as an LCD and a control unit for calculating a value of a signal current and specifying a short-circuited portion or a processing circuit. The control unit is configured by two contactors 2. Based on the detected potential difference, the value of the signal current is calculated and displayed on the display means.
Specifically, the value of the signal current, which is a direct current, is calculated and displayed on the display means based on the potential difference detected by the two contacts 2 and the resistance value, which is a preset rail constant. Further, based on the value of the signal current measured at each measurement point, the short-circuit location is specified and displayed on the display means.

  Further, in the DC track circuit, when moving over the entire insulated rail (blocking section), a handle HD11 for grasping and pushing and pulling by a hand is provided in the longitudinal direction of the traveling unit 1 as necessary. It is pivotally attached to the central part.

[2. Explanation of how to identify the short-circuit location]
Here, the method for identifying the short-circuited part by the signal current measuring device of the DC track circuit according to the embodiment of the present invention will be described in detail with reference to FIGS.
When short-circuited at the short-circuit location FL31 in FIG. 3A, the signal current DI31 flows from the rectifier RF31 to one side of the rail RL31 via the current-limiting resistor R32, and flows to the other side of the rail RL31 via the short-circuit location FL31. And returns to the rectifier RF31.
Then, the traveling unit 1 placed on the rail tread is moved to the measurement point PT31 and the measurement point PT32 along the longitudinal direction of the rail RL31, and the value of the signal current at the measurement point is an embodiment of the present invention. The results of measurement using the signal current measuring device of the DC track circuit are FIG. 3 (b) and FIG. 3 (c). However, the measurement point PT33 and the measurement point PT34 are measured by a normal ammeter.

  As shown in FIG. 3B, the value of the signal current at the measurement point PT31 is “9.7A”, which is different from “4.7A” which is the value of the signal current DI31 flowing out from the rectifier RF31. In addition, a signal current of “9.7 A” is measured even at the measurement point PT32 where a signal current should not flow.

Such a measurement error is caused by, for example, a rail crossing controller current (8.5 kHz AC current) being superimposed on the rail RL31 that was the measurement target in addition to the signal current (DC current) of the DC track circuit. This is because of the measurement error due to the alternating current.
For this reason, the signal processing unit 3 includes a filter that attenuates the frequency component of the current (alternating current) of the railroad crossing controller. Specifically, a low-pass filter (LPF) that passes a signal current that is a direct current and attenuates the frequency component of the current (AC current) of the level crossing controller is provided.

FIG. 3 (c) shows the result of measurement by a signal current measuring device provided with a filter that attenuates the frequency component of the current (alternating current) of the level crossing controller in the signal processing unit 3, and is shown in FIG. 3 (c). Thus, the value of the signal current at the measurement point PT31 is “4.6A”, which is substantially equal to “4.8A” which is the value of the signal current DI31 flowing out from the rectifier RF31, and the signal current should not flow under normal conditions. The measurement point PT32 is also “0.3”.
Therefore, the measurement operator specifies that there is a short-circuited portion FL31 between the measurement point PT31 where the signal current DI31 flowing out from the rectifier RF31 can be measured and the measurement point PT32 where the signal current DI31 flowing out from the rectifier RF31 cannot be measured. can do.

Similarly, when short-circuited at the short-circuit point FL41 in FIG. 4A, the signal current DI41 flows from the rectifier RF31 to one side of the rail RL31 via the current-limiting resistor R32 and passes through the short-circuit point FL41 to the rail RL31. It flows to the other side and returns to the rectifier RF31.
Then, the traveling unit 1 placed on the rail tread is moved to the measurement point PT41 and the measurement point PT42 along the longitudinal direction of the rail RL31, and the value of the direct current at the measurement point is an embodiment of the present invention. FIG. 4B shows the result of measurement using a signal current measuring device of a DC track circuit. However, the measurement point PT43 and the measurement point PT44 are measured by a normal ammeter, and the signal processing unit 1 includes a filter that attenuates the frequency component of the current (AC current) of the crossing controller.

As shown in FIG. 4B, the value of the signal current at the measurement point PT41 is “4.2A”, which is substantially equal to “4.8A” which is the value of the signal current DI41 flowing out from the rectifier RF31. In this case, the measurement point PT42 where no signal current should flow is also “0.0”.
Therefore, the measurement operator specifies that there is a short-circuited portion FL41 between the measurement point PT41 where the signal current DI41 flowing out from the rectifier RF31 can be measured and the measurement point PT42 where the signal current DI41 flowing out from the rectifier RF31 cannot be measured. can do.

  Incidentally, the rail RL31, which was the object of measurement in FIGS. 3 and 4, was not only the signal current (DC current) of the DC track circuit, but also the AC current of the level crossing controller, and therefore a filter was necessary. Of course, the filter is not an essential component as long as it is a DC track circuit in which the AC current of the railroad crossing controller and the like does not flow in a superimposed manner.

  3 and 4, the measurement operator determines the short-circuit portion by determining the presence or absence of the signal current at each measurement point. In the signal processing unit 3, the signal current at each measurement point is specified. It may be determined whether or not there is a short circuit and the short circuit location is displayed on the display means.

  As described above, according to the embodiment of the present invention, in the current measuring device 100 that measures the signal current that is a DC signal of the DC track circuit, the current measuring device 100 is placed on the rail tread so as to be movable along the longitudinal direction of the rail. Detected by the traveling unit 1, two contactors 2 that are provided at predetermined intervals in the longitudinal direction of the traveling unit and are in contact with the rail to detect a potential difference between the contact parts, and the two contactors 2. By providing the signal processing unit 3 that calculates and displays the value of the signal current based on the potential difference, the traveling unit 1 placed on the rail tread is moved to each measurement point along the longitudinal direction of the rail. Since the value of the signal current (DC current) can be calculated and displayed based on the potential difference detected by the two contacts 2, in the DC track circuit, it moves at each measurement point while moving over the entire insulated rail (blocking section). A signal that is a direct current It is possible to measure the flow.

  In addition, the traveling unit is placed on the rail tread and moved to each measurement point, and at each measurement point, a predetermined interval is provided in the longitudinal direction of the traveling unit and the rail is contacted to detect a potential difference at the contact portion. The two contactors for detecting the potential difference between the contact parts, the signal processing unit calculates and displays the value of the signal current based on the potential difference detected by the two contactors, and the signal current is measured. By identifying and displaying that there is a short-circuited point between the measured measurement point and the measurement point where the signal current could not be measured, identify the short-circuited point based on the measured signal current value at each measurement point can do.

(Second Embodiment)
In the description of the embodiment of the present invention, the contact 2 is composed of one conductive member or one brush-like member. However, if the rail is provided with a cant (the outer rail or the road surface is made higher than the inner side at the curved portion of the rail), the rail tread surface is not horizontal but is inclined, and is composed of one brush-like member or the like. In the contact 2 that has been made, only one side (high side) of the rail tread is polished, and therefore, the rail tread may be evenly polished by constituting two brush-like members.
FIG. 5 is a schematic configuration diagram showing an example of the configuration of the signal current measuring device 101 of the DC track circuit according to the second embodiment. In addition, description of the same part as the signal current measuring device of the above-described DC track circuit is omitted as appropriate.
As shown in FIG. 5, the signal current measuring device 101 of the DC track circuit according to the second embodiment includes a traveling unit 1 and a signal processing unit 3, and two further arranged in the short direction of the traveling unit 1. A contact 4 composed of a brush-like member is provided at each end of the traveling unit 1 in the longitudinal direction.
Thus, according to the signal current measuring device 101 of the DC track circuit according to the second embodiment, the contact is made up of the contact 4 composed of two brush-like members arranged in the short direction of the traveling unit 1 and As a result, even if the rail is provided with a cant (in the curved portion of the rail, the outer rail or the road surface is made higher than the inner side), the two brush-like members can easily come into contact with the rail tread. Since the rail tread can be evenly polished, the contact between the contact 4 and the rail tread can be ensured at the measurement point, and the value of the signal current can be measured more accurately.

(Third embodiment)
In the description of the embodiment of the present invention, the two contacts 4 and the like are provided at both ends in the longitudinal direction of the traveling unit 1, but the contactor is pressed against the rail tread by a biasing portion such as a spring. May be.
FIG. 6 is a schematic configuration diagram illustrating an example of the configuration of the signal current measuring device 102 of the DC track circuit according to the third embodiment. In addition, description of the same part as the signal current measuring device of the above-described DC track circuit is omitted as appropriate.
As shown in FIG. 6, the signal current measuring device 102 of the DC track circuit according to the third embodiment includes a traveling unit 1, a signal processing unit 3, and a contact 4, and each contact 4 is used as a rail tread. An urging portion 5 such as a spring to be pressed is provided.
As described above, according to the signal current measuring device 102 of the DC track circuit according to the third embodiment, the contact 4 is pressed against the rail tread by the urging unit 5, so that the contact 4 and the rail tread are reliably measured at the measurement point. Can be secured, and the value of the signal current can be measured more accurately.

In the description of the embodiment of the present invention, the two contacts are in contact with the rail at a predetermined interval to detect the potential difference between the contact portions, but the predetermined interval between the two contacts is made variable. May be.
For example, by increasing the predetermined interval between the two contacts, the value of the potential difference to be measured increases, so that the measurement sensitivity can be improved. Further, when specifying the short-circuited location, the presence / absence of the signal current becomes necessary information rather than the measurement sensitivity, so that the short-circuited location can be specified in detail by narrowing the predetermined interval between the two contacts.

In describing the embodiment of the present invention, the signal processing unit 3 is a signal current that is a direct current based on the potential difference detected by the two contacts 2 and a resistance value that is a preset rail constant. However, the value of the signal current may be calculated using a constant (resistance value) that differs depending on the type of rail.
Since the resistance value that is a constant varies depending on the type of rail, the value of the signal current can be measured more accurately by calculating the value of the signal current using the corresponding resistance value according to the type of rail. .

In describing the embodiment of the present invention, the signal processing unit 3 is a signal current that is a direct current based on the potential difference detected by the two contacts 2 and a resistance value that is a preset rail constant. Although the value of is calculated and displayed, the potential difference detected by the two contacts needs to wait until the value becomes stable.
For this reason, in the signal processing unit 3, a predetermined range of threshold values may be set in advance, and control may be performed so that the measurement result is not displayed until the detected potential difference falls within the predetermined range of threshold values. For example, until the detected potential difference falls within a predetermined range threshold, the display means of the signal processing unit 3 is displayed as “measuring” and the detected potential difference falls within the predetermined range threshold. The value of the signal current calculated in (1) may be displayed.
In this case, it is possible to prevent problems such as a measurement operator accidentally recording an unstable signal current value.

Further, in the signal processing unit 3, a predetermined standby time is set in advance, and when the detected potential difference does not fall within the predetermined range threshold within the predetermined standby time, the rail tread of the contactor It may be determined that the contact is poor, and an error may be displayed on the display means of the signal processing unit 3.
In this case, the measurement operator can ensure the contact between the contactor and the rail tread at the measurement point by reconfirming the contact state between the contactor and the rail tread, and more accurately The current value can be measured.

DESCRIPTION OF SYMBOLS 1 Traveling part 2, 4 Contact 3 Signal processing part 5 Energizing part GD11 Guide RL21, RL31 Rail TP21 Rail tread R31, R32 Current limiting resistance TR31 Track relay FR31 Rectifier FL31, FL41 Short-circuit location

Claims (8)

In a current measuring device that measures a signal current that is a DC signal of a DC track circuit,
A traveling unit placed on the rail tread so as to be movable along the longitudinal direction of the rail;
Two contactors provided at predetermined intervals in the longitudinal direction of the traveling portion and in contact with the rail to detect a potential difference of the contact portion;
A signal processing unit that calculates and displays the value of the signal current based on the potential difference detected by the two contacts;
A signal current measuring instrument comprising:   The signal current measuring device according to claim 1, wherein the signal processing unit includes a filter that attenuates a frequency component of an alternating current that flows while being superimposed on the rail.   The signal current measuring device according to claim 1 or 2, wherein a predetermined interval between the two contacts is variable.   The signal current measuring device according to any one of claims 1 to 3, wherein the signal processing unit calculates the value of the signal current using different constants depending on the type of the rail.   5. The signal current measuring device according to claim 1, wherein the contact is formed of a brush-like member that is capable of polishing the rail tread and has conductivity.   The signal current measuring device according to claim 4, wherein the contact is composed of two brush-like members.   The signal current measuring device according to claim 1, further comprising an urging portion that presses the contact against the rail tread. A short-circuit location identifying method for measuring a signal current that is a DC signal of a DC track circuit and identifying a short-circuit location,
A step of placing a traveling part movable along the longitudinal direction of the rail on the rail tread and moving to each measurement point;
At each measurement point, two contactors provided at a predetermined interval in the longitudinal direction of the traveling unit and contacting the rail detect a potential difference between the contact parts;
The signal processing unit calculates and displays the value of the signal current based on the potential difference detected by the two contacts, and the measurement point where the signal current can be measured and the measurement where the signal current cannot be measured Identifying and displaying that there is a short-circuited point between the point,
A method of identifying a short-circuit location, comprising:

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