JPH08285513A - Detecting device of abrasion limit of contact wire - Google Patents

Abstract

PURPOSE: To detect a contact wire coming to the abrasion limit, with high reliability, so that this can be judged immediately at the time point of detection without conducting a data analysis, to execute replacement of the contact wire exactly and also to reduce the cost of control by reduction of the amount of recorded data and others. CONSTITUTION: In relation to a contact surface of a contact wire 13 prepared by embedding a core material 13b such as a steel wire inside a conductive material 13a such as copper, a detecting means 14 of the core material which utilizes an eddy current or a leakage flux is moved with a prescribed distance kept therefrom by fitting this means to a collector head of a pantograph. At this time, the abrasion limit is detected by comparing an output of an induction coil with a prescribed reference value, and when the abrasion limit is detected, it is recorded together with data on a position of detection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trolley wire wear limit detecting device for supplying electric power by slidingly contacting a pantograph in an electric railway.

[0002]

2. Description of the Related Art As shown in FIG. 18, a trolley wire 1 for supplying electric power in an electric railway hangs on an electric pole 2 which is erected along a railway line and a overhead line 3 which is supported by the electric pole 2. It is suspended and supported by the hanger 4. Hanger 4
19A, the grooves 1a formed on both sides of the trolley wire 1 as shown in FIG. 19A are sandwiched by the hanger 5 as shown in FIG.

The trolley wire 1 is, as shown in FIG.
The required electric power is supplied to the electric vehicle by contacting the contact plate 8 attached to the hull 7 of the pantograph of the electric vehicle. Therefore, it is damaged by mechanical sliding or arc between the sliding plate 8 of the pantograph and the trolley wire, and the state shown in FIG. 19 (a) is worn as shown in FIG. 19 (b).
If this wear progresses, the trolley wire will be broken. It is not only the user that the operation of the train stops due to the disconnection,
The social loss and impact are extremely large, and not breaking the trolley wire 1 has become an important issue for those who maintain the electric railway. For this reason, a special inspection vehicle or the like for measuring wear of the trolley wire 1 has been manufactured, and wear is measured about once every 10 days on the Shinkansen and about twice a year on conventional lines.

Conventionally, this inspection is performed as shown in FIG.
The laser beam 9 is projected from directly below the trolley wire, and the width W of the contact surface 1b shown in FIG.
Was being measured. This is achieved by rotating the rotating mirror 10 provided in the optical system for projecting the laser beam 9
The laser light 9 is scanned in a direction orthogonal to the trolley wire 1, and the reflected light is transmitted to a light receiving element 12 by a perforated mirror 11 (the laser light 9 is projected through the hole) provided in the same optical system. The width W of the contact surface 1b is measured by detecting the time when the reflected light exceeds a certain level by a predetermined comparator. The relationship between the wear of the trolley wire 1, the output of the light receiving element 12, and the detection time is as shown in FIG. The width W of the contact surface thus obtained is converted into the remaining diameter (height H of the cross section of the contact wire) and used for the judgment of replacement of the contact wire.

[0005]

The reflected light observed by the above-mentioned conventional inspection is apt to change under the influence of the surface condition of the trolley wire, and new metal fittings (such as hanger) arranged near the trolley wire or Since the reflected light from the catenary may be detected as noise, whether or not the wear limit has been reached is determined, for example, by chronologically determining whether the same data occurred three times or more at the same point, or the previous measurement. It is necessary to make a comprehensive judgment such as how to compare with the data. For this reason, it is necessary to record the inspection data of all lines in a magnetic tape recorder installed in the inspection vehicle, take it home, process it with a large computer at the center on the ground, and store the enormous amount of data every time. Therefore, the above-mentioned inspection method is expensive.

Further, in the inspection method shown in FIG. 21, since the scanning time of the laser beam by the rotating mirror 10 is required, it is necessary to measure every predetermined length (for example, 6 cm) to examine all the contact surfaces. However, since the detection condition is that the same data is generated three times or more at the same point in time series, there is a problem that it is difficult to surely grasp the local wear point leading to the disconnection.

[0007]

[Means for Solving the Problems]

(1) The trolley wire wear limit detection device provided by the present invention is a device for detecting that a trolley wire in which a core material is covered with a conductive material reaches a wear limit due to sliding of a pantograph or an arc. May be used, and leakage magnetic flux may be used.

The one using the vortex flow is an exciting coil for acting an alternating magnetic field on the trolley wire, an induction coil for detecting the vortex flow generated in the trolley wire by this, and the maximum sensitivity of this induction output to the vortex flow flowing through the core material. A core material detecting means composed of a phase detection circuit for detecting a phase with

From the outputs of the moving means for moving the core material detecting means along the contact surface of the trolley wire at a predetermined interval and the output of the core material detecting means, the exposure of the core material due to wear of the trolley wire is detected. And a determination means for detecting the wear limit of the trolley wire.

The one utilizing the leakage magnetic flux directs the N pole and the S pole to a position apart from the trolley wire by a certain length along the erection direction, and uses the trolley wire in this section as a magnetic path. Trolley wire detection means, which is composed of magnets opposed to each other, and an induction coil that is provided along the trolley wire in this section and that detects a leakage magnetic flux generated due to the exposure of the core material surface due to wear,

The exposure of the surface of the core material due to the abrasion of the trolley wire is detected from the output of the moving means for moving the core material detecting means along the contact surface of the trolley wire at a predetermined interval and the output of the core material detecting means. And a determining means for detecting the wear limit of the trolley wire.

(2) Using the vortex flow of (1) above,
In both of those utilizing the leakage magnetic flux, the core material detecting means has an induction coil. Two of these induction coils may be arranged in the installation direction of the trolley wire, and the difference between the induction currents may be used as the induction output.

In addition, although the above-mentioned configuration has the same purpose of use, since the output characteristics are different, they are switched and used according to the measurement conditions, so both can be installed together with the switching circuit.

(3) As the moving means, a pantograph of an electric vehicle traveling on a train track can be used. That is, the core material detecting means can be attached to the boat plate portion of the pantograph.

(4) The determination result can be stored in the storage device together with the data for specifying the detection position only when the determination means determines that the wear limit has been reached.

[0016]

[Action]

(1) The trolley wire wear limit detecting device of the present invention detects the exposure of the core material to the surface of the trolley wire by utilizing the fact that the vortex flow concentrates on the surface when the vortex flow is used. At this time, high accuracy is obtained by detecting the vortex flow of the core material by phase detection separately from the vortex flow of the conductive material. When the leakage magnetic flux is used, when the core material surface is exposed due to local wear of the trolley wire, the leakage magnetic flux generated by the change in the magnetic path is detected.

(2) When the means for detecting the core material is provided with two induction coils and the difference between the outputs of the induction coils is detected, local wear of the trolley wire can be detected with high sensitivity.

If the above-mentioned configuration is used together and the output characteristics of the two are switched and used, an accurate inspection according to the traveling speed of the moving means or the like becomes possible.

(3) If the pantograph of an electric car is used as the moving means, the detecting means of the core material can be surely moved along the contact surface of the trolley wire with a certain distance without making a special device. You can

(4) Only when the wear limit is reached, if this is stored in the storage device together with the detected position data, the amount of data is reduced and the management cost can be reduced. This is particularly useful when incorporating the device of the present invention into an electric vehicle.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the apparatus of the present invention, as shown in FIG. , Detect the wear limit of trolley wire.

Here, the trolley wire 13 to be detected by the device of the present invention will be described.

The trolley wire 13 has a core material 13b made of a material different from that of the conductive material 13a embedded therein. Specifically, the trolley wire 13 is improved in tension resistance and wear resistance to speed up the electric railway. There is a CS trolley wire which has been recently adopted to cope with the above. The CS trolley wire uses a steel wire as a core material and copper as a conductive material around the core wire. While the steel wire is a magnetic material, copper is a non-magnetic material.
When an AC magnetic field is applied to generate an eddy current, the phase of the eddy current with respect to the applied AC magnetic field differs between the steel wire and the copper.

The trolley wire 13 to be detected by the present invention is
A trolley wire using a core material may be used as long as the core material and the surrounding conductive material have any of the above properties. For example, a hard copper trolley wire or a tinned trolley wire used in a conventional wire having a core material having different properties as described above is used as a detection target of the present invention. If the core material 13b is mainly intended for detection according to the present invention, the lower end thereof may extend to the wear limit detection position. For example, the cross-sectional shape is not limited to a circle,
As shown in FIG. 2, a strip-shaped core material 13b can be used.

The core material detecting means 14 detects the exposure of the core material 13b of the trolley wire caused by the wear of the trolley wire, and utilizes the vortex flow [FIG. 3 (a)] and the leakage magnetic flux. There is a case [Fig. 3 (b)]. This specific means will be described later.

The moving means 15 connects the core material detecting means 14 with
The trolley wire 13 is placed along the contact surface 13c with a constant distance L, and a pantograph of an electric vehicle can be used in addition to designing a dedicated moving means.

The judging means 16 compares the electric output of the core material detecting means 14 with a predetermined reference value to judge whether or not the trolley wire 13 has reached the wear limit and outputs it. Further, the determination means 16 also makes a comparison with the alarm level in order to obtain an alarm signal notifying that the wear limit has not been reached but the wear limit has been approached.

When the judging means 16 judges that the wear limit has been reached, the storing means 17 stores this together with the data for specifying the detection position. This stored content is a detection signal of the wear limit output by the determination means 16, and may be combined with the alarm signal or the output signal of the detection means 14 indicating the wear amount. The data for specifying the detection position is the traveling distance from the inspection start point or the data of the current traveling point received from the vehicle base or the like through the communication line. As the storage means 17, a magnetic recording medium, recording paper, a non-volatile semiconductor memory or the like can be used.

The monitor means 18 monitors the output of the detecting means 14 and the output of the judging means 16 while the apparatus is in operation, and a level meter, a pen recorder or the like is used. If the core material of the trolley wire is exposed due to local wear,
Since a change appears abruptly, when a change to be detected appears, it is held for a certain period of time by a peak hold circuit so that it can be visually checked.

Next, when the exposure of the core material 13b of the trolley wire caused by wear is detected by eddy current [FIG.
The core material detecting means 14a of (a)] will be described with reference to FIGS.

The core material detecting means 14a shown in FIG. 4 detects an eddy current generated in the trolley wire when an AC magnetic field is applied to the trolley wire 13 from the exciting coil 19 by the induction coil 20, and the detecting circuit 21 detects the eddy current. A phase shift signal obtained by passing the signal of the oscillator 22 through the phase shift circuit 23 is phase-detected to selectively extract the eddy current component generated by the core material.

FIG. 5 shows an artificially worn CS trolley wire 1.
The point where the maximum output is obtained when phase detection of 3'is
This is a plot in which the output when a new CS trolley wire is measured is taken as the origin. When the wear gradually wears down to, the point where the maximum output is obtained changes as shown in the right figure. In the right figure, when only copper is worn, the amplitude increases along a straight line (copper axis) extending from the origin. The reason why the amount of increase suddenly increases after is that the area of copper that appears on the contact surface increases rapidly with wear. Subsequent changes are combined with changes in the component orthogonal to the copper axis. This change shows a decrease in the copper area and an increase in the iron area that appear on the contact surface. Therefore, phase detection is performed on the phase axis orthogonal to the copper axis (which is called the iron axis because only the change in iron is captured), and is not affected by the presence of copper, which is the conductive material 13a.
The degree of exposure of the steel wire which is the core material 13b can be measured. The relationship in which the detection phases are different is in addition to the combination of steel and copper. When the core material 13b and the conductive material 13a have this relationship, detection using eddy current is possible.

FIG. 4 shows an exciting coil 19 and an induction coil 20.
However, as shown in Fig. 6 (a),
If two induction coils 20a1 and 20a2 are provided and the difference between the induction outputs is phase-detected, highly accurate measurement can be performed. In this case, the difference is taken out by the self comparison method. In the self-comparison method, the two induction coils 20a1 and 20a2 are set in the air-core state in advance (the trolley wire is not brought close to each other), and the difference between the outputs at that time is adjusted to zero. The detection output of this difference is shown in FIG.
As shown in (b), it has a sharp rise at the local wear point. In response to this difference output, the determination means 16 compares the wear limit reference value and the alarm level and outputs a wear limit detection signal or a warning signal.

The core material detecting means 14a for detecting by the eddy current may be a standard comparison method as shown in FIGS. 7 (a) and 7 (b).

In the standard comparison method, the output of a new trolley wire is measured in advance, and how much the output changes when the trolley wire to be inspected is measured. In this, the core material detecting means 14a is bridge-connected as shown in FIG. 7 (a), and two exciting coils L1 and L2 [19] and induction coils L3 and L4 [20a1 and 20a2] are provided at two positions. Arrange them upside down at the detection position of. Before the inspection, lower the pantograph, put a new trolley wire on the inspection position, measure the output of the bridge circuit, and store it. If you raise the pantograph and inspect the trolley wire installed,
Since the lower induction coil L3 [20a1] is separated from the trolley wire 13, it is possible to detect a change in the induction output of the upper induction coil L4 [20a2]. The waveform obtained by phase-detecting the change in the induced output has a sharp rise at the local wear point as shown in FIG. 7 (c). The determination means 16 determines the detection output based on the reference value of the wear limit and the alarm level, as described with reference to FIG.

Next, the core material detecting means 14b in the case of detecting the exposed surface of the core material surface of the trolley wire caused by the progress of wear of the trolley wire by the leakage magnetic flux [FIG. 3 (b)],
This will be described with reference to FIGS. 8 and 9.

As shown in FIG. 8, the core material detecting means 14b
Directs the N pole and the S pole to positions apart from the trolley wire 13 by a certain length along the erection direction, disposes the two magnets 241 and 242 opposite to each other via the trolley wire 13, and connects the other pole to the other pole. The trolley wire 13 in this section is connected by a magnetic pole piece 25 to form a magnetic path, and the induction coil 26 is arranged along the trolley wire in this section to detect leakage magnetic flux generated by local wear 27 of the trolley wire. It is something that is done. When the trolley wire 13 is not worn and when it is worn on average, the magnetic flux flows evenly in the trolley wire 13, but the local wear 2
When there is a change in the magnetic path shape due to 7, a leakage magnetic flux is generated at that position. This can be detected by the induction coil 26. This detection indicates that the local wear 27 of the trolley wire is
This is possible when the process proceeds to the point where 3b is exposed and when the core material itself is worn and unevenness is formed on the surface of the core material. The wear of the trolley wire often takes the form of local wear because it is caused by violent contact with the pantograph, and the deep local wear 27 causes disconnection, so that the wear limit can be accurately determined. Becomes

Since the leakage flux method detects a change in the surface shape of the magnetic path, as shown in FIG. 9, the adjacent portions of the trolley wire are simultaneously detected by the two induction coils 26a1 and 26a2, and the difference between them is detected. The self-comparison method of taking out is suitable. As a result, noise due to causes other than wear can be eliminated and accuracy can be improved.

As described above, the core material detecting means 14a utilizing the eddy current and the means 14 utilizing the leakage magnetic flux.
There is b. Since these have different output characteristics, they are switched and used according to the measurement conditions, so that both can be installed together with the switching circuit 28 as shown in FIG. As a result, it is possible to select and use the one suitable for the inspection condition in consideration of the difference in the detection characteristics and detect the wear limit by combining the inspection data. The difference in the detection characteristics is that it is difficult to obtain a large output at high speed running when using the eddy current, whereas a large output is obtained at higher running speed in the leakage flux method.

Next, an example of assembling the core material detecting means 14a and 14b will be described.

11 and 12 show the core material detecting means 14a of FIG. 6 for detecting the exposure of the core material by the vortex flow.

In the figure, reference numeral 7 denotes a hull of the pantograph shown in FIG. 20, 8 denotes a contact plate attached to the upper surface of the hull, and the core material detecting means 14a is attached to the hull 7 via a bracket 29. It is installed. Boat 7 and siding 8
Has a long extension perpendicular to the installation direction of the trolley wire so that power can be reliably supplied even if the electric vehicle and the trolley wire roll sideways. Therefore, the exciting coil 19 and the induction coils 20a1 and 20a2 provided along the contact plate 8 are wound in the winding frame 30 in a rectangular shape extending long in the direction orthogonal to the trolley wire. The surface of the winding frame 30 facing the trolley wire 13 is covered with a protective cover 31 to keep the inside airtight.

FIG. 11 shows two induction coils 20a1 and 2a.
A common exciting coil 19 is provided below 0a2,
As shown in FIG. 13, the exciting coil 19 may be arranged at the center and the induction coils 20a1 and 20a2 may be provided on both sides thereof,
As shown in FIG. 14, two induction coils 20a1 and 20a2
The exciting coil 19 divided into two may be arranged immediately below the.

FIGS. 15 and 16 show the core material detecting means 14b of FIG. 9 for detecting the exposure of the surface of the core material by the leakage magnetic flux method.
Indicates.

In the figure, 7 is a pantograph boat, and 8
11 shows that the contact plate is attached to the upper surface of the boat body, and the core material detecting means 14b is attached to the boat body 7 via a bracket 29, as in FIGS. A large number of magnets 24 that pass magnetic flux through the trolley wire 13 in a certain section are provided in the holding case 32 in a dispersed manner in the longitudinal direction of the boat body 7. The magnetic pole on the side opposite to the trolley wire 13 has a magnetic pole piece 33.
Are magnetically coupled by. Two induction coils 2
6a1 and 26a2 are housed inside a winding frame 34 that extends along the hull 7 at a position surrounded by a pair of magnets 241 and 242. Reference numeral 31 is the protective cover. Even if the magnets 241 and 242 are arranged in such a distributed manner, a substantially uniform magnetic field distribution can be obtained in the portion of the trolley wire 13 facing the induction coils 26a1 and 26a2.

Next, the moving means 15 described with reference to FIG. 1 will be described with reference to FIG.

FIG. 17 shows a case where a pantograph upper frame 36 of an electric vehicle is used as the moving means 15. As described above, the core material detecting means 14a and 14b are attached to the boat body 7 of the pantograph upper frame 36 via the bracket 29. The pantograph upper frame 36 of the electric car is the trolley wire 1
Since it has been continuously improved so that power can be stably received from the core wire, it is considered to be optimum as a means for keeping the core material detection means 14a, 14b along the contact surface of the trolley wire 13 at a constant distance. To be Since the original function of the pantograph is stable contact with the trolley wire, the function of the moving means 15 of the present invention can be sufficiently satisfied, and it is also possible to perform inspection during commercial operation.

[0048]

The present invention reduces the wear limit of the core material of the trolley wire,
This is performed by detecting the exposure of the core material due to the eddy current or the exposure of the core material by the leakage flux method. Since such magnetic detection is not affected by the reflection of light from the surface of the trolley wire or surrounding components, as in the case of using laser light,
Highly accurate detection is possible, and unlike the intermittent detection of the laser beam method, since the entire length of the trolley wire is continuously scanned, inspection without detection omission is possible. For this reason,
Highly reliable inspection data can be obtained and trolley wire can be replaced accurately. In addition, the trolley wire replacement judgment can be made only by the wear limit detection signal without the complicated processing of bringing back the data of all the line sections and processing it with a large-scale computer to make a comprehensive judgment like the laser light method. Therefore, the management cost can be reduced.

[Brief description of drawings]

FIG. 1 shows a configuration example of a trolley wire wear limit detection device of the present invention.

FIG. 2 is a sectional view showing another example of a trolley wire to be detected by the present invention.

FIG. 3 is a diagram for explaining the detection contents of the wear limit detection device for a trolley wire of the present invention, where (a) uses eddy current to detect the exposure of the core material, and (b) uses leakage magnetic flux. The case where local wear is detected is shown.

FIG. 4 shows an example of the configuration of a core material detecting means using vortex flow.

FIG. 5 is a graph plotting points (1) to (3) at which maximum output is obtained when phase detection is performed on an artificially worn CS trolley wire in order to explain the principle of phase detection in the core material detection means of FIG. Show.

FIG. 6 is an explanatory diagram of a case where two induction coils are used as a core material detection means using vortex flow and the difference between them is used as an induction output (self-comparison method), (a) is a circuit configuration example, and (b) is Shows a concrete example of the detection output.

FIG. 7 is an explanatory diagram of a case where two induction coils are used as a core material detecting means using leakage magnetic flux and an output is taken out from a bridge circuit including these coils (standard comparison method), (a) is a circuit configuration example, (b) is a layout of the excitation coil and induction coil,
(c) shows a concrete example of the detection output.

FIG. 8 shows an example of the configuration of a core material detecting means using leakage magnetic flux.

FIG. 9 shows a configuration example in the case where two induction coils are used as the core material detecting means using the leakage magnetic flux and the difference between them is used as an induction output (self-comparison method).

FIG. 10 shows a configuration example in which a core material detecting means utilizing vortex flow and a core material detecting means utilizing leakage magnetic flux are combined and can be arbitrarily selected and used by a switching circuit.

FIG. 11 is a side sectional view showing an example of assembling the core material detecting means using the vortex flow of FIG. 6 (a common exciting coil is provided across two induction coils).

12 shows a plan view of the assembly example shown in FIG.

FIG. 13 shows a modification of FIG. 11 (excitation coil is arranged at the center and induction coils are provided on both sides thereof).

FIG. 14 shows a modification of FIG. 11 (provided with two pairs of exciting coils and induction coils).

FIG. 15 is a side sectional view showing an example of assembling the core material detecting means by the magnetic flux leakage method of FIG.

16 shows a plan view of the example of assembly shown in FIG.

FIG. 17 shows a pantograph of an electric vehicle as a moving means of the present invention.

FIG. 18 is a perspective view showing an installed state of a trolley wire for supplying electric power in an electric railway.

FIG. 19 is a cross-sectional view of a new trolley wire (a) and a trolley wire (b) that has reached the wear limit.

FIG. 20 is a cross-sectional view showing a state in which the trolley wire 1 contacts the pantograph of the electric vehicle.

FIG. 21 is a schematic view of a conventional inspection device using laser light.

22 is a diagram showing the relationship between the wear of the trolley wire in the device of FIG. 21, the output of the light receiving element, and the detection time.

[Explanation of symbols]

 7 Pantograph Boat Body 8 Railing Plates Attached to Boat Body 13 Trolley Wire 13 'CS Trolley Wire 13a Trolley Wire Conductive Material Part 13b Trolley Wire Core Material 14, 14a, 14b Core Material Detecting Means 15 Moving Means (Pantagraph Hull ) 16 determination means 17 storage means 18 monitoring means 19 excitation coil 20, 20a, 26, 26a induction coil 21 detection circuit 22 AC oscillator 23 phase shift circuit 24 magnet 25, 33 pole piece 27 local wear of trolley wire 28 switching circuit 29 bracket 30 Reel 31 Protective Cover 32 Holding Case 36 Pantograph of Electric Vehicle

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tadashi Kobida, 8-8 Hikarimachi, Kokubunji, Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor, Yusuke Sato, 2-8, Hikarimachi, Kokubunji, Tokyo Address 38 Inside the Railway Technical Research Institute (72) Inventor Goro Yokota, 13-1 Yamanouchi-Midodencho, Ukyo-ku, Kyoto

Claims (7)

[Claims] 1. A device for detecting that a trolley wire having a core material covered with a conductive material reaches a wear limit due to sliding of a pantograph or an arc, and an exciting coil for applying an AC magnetic field to the trolley wire. , A core material detecting means composed of an induction coil for detecting an eddy current generated in the trolley wire by this, and a phase detection circuit for detecting the induction output at a phase having the maximum sensitivity to the eddy current flowing in the core material; Of the core wire surface due to wear of the trolley wire is detected from the output of the moving means for moving the detection means of the core wire at a predetermined interval along the contact surface of the trolley wire and the output of the detection means of the core wire. A trolley wire wear limit detection device comprising: a determination unit that detects a wear limit. 2. The induction coil of the core material detecting means is arranged in two in the trolley wire installation direction, and the difference between the induced currents is used as the induction output. Trolley wire wear limit detector. 3. A device for detecting that a trolley wire having a core material covered with a conductive material has reached a wear limit due to sliding of a pantograph or an arc, the trolley wire being installed along the erection direction. Magnets that are arranged opposite to each other so that the trolley wire in this section serves as a magnetic path with the N pole and S pole facing away from each other by a certain length, and the core material surface due to wear that is provided along the trolley wire in this section A core material detecting means composed of an induction coil for detecting a leakage magnetic flux generated by the exposure of the core material, and a moving means for moving the core material detecting means at a predetermined interval along the contact surface of the trolley wire, A trolley wire wear limit detection device, comprising: a determination unit that detects the wear limit of the trolley wire by detecting the exposure of the core material surface due to the wear of the trolley wire from the output of the core wire detection unit. 4. The induction coil of the core material detecting means is arranged in two in the trolley wire installation direction, and the difference between the induced currents is used as the inductive output. Trolley wire wear limit detector. 5. An apparatus for detecting that a trolley wire having a core material covered with a conductive material has reached a wear limit due to sliding of a pantograph or an arc, the detection of the core material according to claim 1. Means and the core material detecting means according to claim 3 or 4, a switching circuit for switching between the combined use of these core material detecting means and the use of one of them, and the detecting means of each core material along the contact surface of the trolley wire. And a determination means for detecting the wear limit of the trolley wire by detecting the exposure of the core material surface due to the wear of the trolley wire from the output of the core material detection means. A trolley wire wear limit detector characterized by. 6. A pantograph of an electric vehicle traveling on a train track is used as the moving means, and the detecting means of the core material is attached to a boat plate portion of the pantograph.
The trolley wire wear limit detection device according to any one of 5 above. 7. The storage device according to claim 1, further comprising a storage device for storing the detection limit together with data for specifying a detection position when the determination means determines that the wear limit has been reached. The trolley wire wear limit detection device described.