JP2003189404A - Abnormality detecting method for trolley wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for detecting abnormality of a trolley wire capable of detecting wear or extension early and also detecting abnormal position in length direction, at a low cost. <P>SOLUTION: The vibration characteristics of a trolley wire 3 when a train passes is detected with a vibration detecting sensor 5 attached to the trolley wire 3. Based on the vibration characteristics, abnormality of the trolley wire 3 is detected. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an abnormality such as wear and temperature rise of a trolley wire, and in particular, early detection of wear and elongation, and further detection of an abnormal position in the longitudinal direction, Moreover, the present invention relates to a low-cost trolley wire abnormality detection method.

[0002]

2. Description of the Related Art A trolley wire is installed to supply electric power to a train via a pantograph or the like.

Conventionally, in order to observe a reduction in cross-sectional area due to wear of the trolley wire installed, a detection device using a laser or the like is installed in an inspection vehicle, and this inspection vehicle is used when there is no train operation such as midnight. While traveling, the wear state of the trolley wire is observed by the above detection device.

Further, as shown in FIG. 3, a detection wire insulated from the trolley wire body is inserted inside the trolley wire body, and when the wear of the trolley wire body reaches the detection wire, the detection wire is disconnected. There is also known a method of detecting that the wear has reached the limit.

[0005]

Since the detection device using a laser or the like can be inspected only when the electric vehicle is not in operation at midnight or the like, it detects abnormal wear that occurs during the operation of the electric vehicle in the daytime. It is not possible.

On the other hand, the trolley wire with the detection wire cannot detect the abnormality unless the wear limit of the detection wire causes the abnormality. For this reason, when the wear limit is reached, a replacement trolley wire is prepared and a replacement work plan is drafted. There is a possibility of reaching.

Furthermore, the tensile strength of the trolley wire is lowered due to an increase in over temperature, and local elongation occurs. If this elongation progresses, the wire breaks. The elongation up to this disconnection progresses rapidly. However, the trolley wire with the detection wire cannot detect an abnormality unless the detection wire is broken. Therefore, even if the detection wire breakage due to the extension of the trolley wire is detected, the trolley wire may not be exchanged in time and the trolley wire may be broken during use of the overhead wire. As described above, it is difficult to predict the breakage of the trolley wire due to the decrease in the tensile strength caused by the increase in the overtemperature with the conventional technology.

Further, since the conventional trolley wire with the detection wire cannot detect at which position in the longitudinal direction of the overhead wire the abnormality occurs, when an abnormal signal is issued and the abnormal position is confirmed, the trolley wire is detected. It is necessary to check the entire length of the overhead line section, and it is troublesome to check it.

The trolley wire with the detection wire is manufactured by inserting the detection wire into a predetermined position inside the trolley wire main body over the entire length of the trolley wire, so that it is difficult to process and the cost of the trolley wire main body is high. There's a problem.

Therefore, an object of the present invention is to solve the above problems and to provide a method for detecting abnormality of a trolley wire which is capable of early detection of wear and elongation, is capable of detecting an abnormal position in the longitudinal direction, and is low in cost. Especially.

[0011]

To achieve the above object, the present invention is to detect the vibration characteristic of a trolley wire when a train is passing and to detect an abnormality of the trolley wire based on the vibration characteristic.

Abnormal positions in the longitudinal direction of the trolley wire may be detected by detecting vibration characteristics at a plurality of points in the longitudinal direction of the trolley wire.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the trolley wire abnormality detecting apparatus for carrying out the method of the present invention has a structure in which the vibration of the trolley wire 3 being transmitted is transmitted to the trolley wire 3, for example, a suspension tool 4.
A detection sensor 5 for detecting the vibration of is installed, and the vibration detection sensor 5 is connected to the vibration characteristic analyzer 6. The vibration characteristic analyzer 6 is connected to a computer 7 which is a means for analyzing a vibration abnormality from a measured value.

The vibration detection sensors 5 are installed at a plurality of positions at arbitrary intervals in the longitudinal direction of the trolley wire 3, and each vibration detection sensor 5 is connected to the vibration characteristic analyzer 6. The vibration characteristic analyzer 6 can obtain the vibration frequency from the vibration signal detected by the vibration detection sensor 5. The computer 7 determines that the trolley wire 3 is abnormal when the frequency changes to an abnormal value by comparing the measured value of the frequency with an abnormal value set in advance, and outputs an alarm. It is supposed to do.

As shown in FIG. 2, the trolley wire 3 is composed only of a trolley wire body made of copper or a copper alloy.
The inside of the trolley wire body is not specially processed.

The specific operation of detecting trolley wire abnormality will be described below.

The vibration detecting sensor 5 always detects the vibration of the trolley wire even during the daytime operation of the electric vehicle.
The vibration characteristic analyzer 6 obtains the vibration frequency from the vibration signal detected by the vibration detection sensor 5 and constantly informs the computer 7 of the vibration frequency.

When the cross-sectional area of the trolley wire 3 changes due to wear, the natural frequency of the trolley wire 3 changes, and the frequency of the trolley wire 3 changes due to passing of a train or the like. Therefore, it can be seen that the cross-sectional area changed because the frequency changed. An abnormal value is set in advance for the frequency, and by constantly comparing the measured value with the abnormal value, it is determined that the trolley wire 3 is worn because the frequency of the trolley wire 3 becomes the abnormal value. can do. That is, the abnormality (wear) of the trolley wire 3 can be detected.

When the tensile strength changes due to the temperature rise of the trolley wire, the natural frequency of the trolley wire 3 changes,
The frequency of the trolley wire 3 changes due to passage of a train or the like. Therefore, it can be seen that the temperature changed because the frequency changed. An abnormal value is set in advance for the frequency, and by constantly comparing the measured value with the abnormal value, the frequency of the trolley wire 3 becomes an abnormal value, so that the trolley wire 3 has overheated. Can be determined. That is,
It is possible to detect an abnormality (an increase in over temperature) of the trolley wire 3.

Therefore, changes in frequency (abnormal value) due to various abnormal phenomena (wear, over temperature rise, etc.) of the trolley wire 3
Is measured in advance by an experiment, and the abnormal value is stored in the memory of the computer 7. Computer 7 has
Incorporate an algorithm that detects abnormalities by comparing measured values with abnormal values.

The computer 7 detects the abnormality of the trolley wire 3 by applying the above-mentioned algorithm to the frequency which is constantly informed from the vibration characteristic analyzer 6 and outputs an alarm.

When the cross-sectional area locally changes due to abnormal wear or the tensile strength locally decreases due to excessive temperature increase in the longitudinal direction of the trolley wire 3, the natural frequency of the trolley wire 3 locally changes. The frequency of the trolley wire 3 locally changes due to passage of a train or the like. This local change in the frequency of the trolley wire 3 in the longitudinal direction can be detected by specifying the position by detecting the frequency at a plurality of locations in the longitudinal direction of the trolley wire 3. That is,
The computer 7 detects the abnormality by comparing the vibration frequency of each installation location detected through the plurality of vibration detection sensors 5 with an abnormal value set in advance by an experiment, and installs the vibration detection sensor 5 in which the abnormality is detected. The location is output as an abnormal position together with an alarm.

If the abnormal value set in the computer 7 is made to correspond to wear less than the wear limit at which the detection line causes abnormality in the prior art, it is possible to detect earlier with less wear than in the prior art. As a result, the replacement trolley wire can be prepared before the trolley wire 3 reaches the wear limit, and the replacement work plan can be prepared, and the replacement can be completed before the disconnection accident during use of the overhead wire.

As described above, according to the present invention, it is possible to satisfy the conventional trolley wire abnormality detection items by using the vibration detection sensor 5 and the vibration analysis means. It is possible to detect the wear abnormality before the detection wire disconnection and the elongation abnormality due to the excessive temperature rise. Further, according to the present invention, it becomes possible to detect an abnormal position in the longitudinal direction of the trolley wire.

Further, according to the present invention, since a simple trolley wire can be used without special processing inside the trolley wire, the trolley wire abnormality detecting device can be constructed at a low cost and the overhead wire itself. The cost of can be reduced.

In this embodiment, the abnormality of the trolley wire is detected by the frequency, but the abnormality can be detected by other vibration characteristics. The vibration characteristics include, for example, amplitude, propagation velocity, damping, period and the like.

[0028]

The present invention exhibits the following excellent effects.

(1) Abnormal wear and elongation abnormalities due to excessive temperature rise can be detected at an early stage.

(2) It is possible to use a simple trolley wire having no detection wire and the like, and the cost can be reduced.

(3) An abnormal position in the longitudinal direction of the trolley wire can be detected.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a trolley wire abnormality detection device showing an embodiment of the present invention.

FIG. 2 is a sectional view of a trolley wire.

FIG. 3 is a sectional view of a trolley wire including a detection wire.

[Explanation of symbols]

3 trolley wire 4 suspenders 5 Vibration detection sensor 6 Vibration characteristic analyzer 7 computer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyoshi Hikita             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. (72) Inventor Kunio Hashimoto             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. (72) Inventor Hitoshi Hashimoto             1-6-1, Otemachi, Chiyoda-ku, Tokyo             Standing Wire Co., Ltd. F term (reference) 5H115 PA08 PC01 PG01 PI01 PU01                       QN02 SE10 TO30 TR16 TU20                       TW02

Claims (2)

[Claims] 1. A method of detecting an abnormality in a trolley wire, comprising detecting a vibration characteristic of the trolley wire when passing a train and detecting an abnormality in the trolley wire based on the vibration characteristic. 2. The abnormality detecting method for a trolley wire according to claim 1, wherein abnormal positions in the longitudinal direction of the trolley wire are detected by detecting vibration characteristics at a plurality of locations in the longitudinal direction of the trolley wire.