Trolley wire

Abstract

To provide a trolley wire with a built-in abrasion detection line which can restrain replacement life from deteriorating when overhead power line is provided in a section where inclined wear occurs.SOLUTION: A trolley wire 1 comprises: a trolley wire body 10 which includes two holes 14a, 14b for abrasion detection line which are provided on both sides of center line 18 in its inside; and two abrasion detection lines 20 which are stored in the two holes 14a, 14b for abrasion detection line. In cross section of a radial direction of the trolley wire body 10, the trolley wire is configured so that common circumscription line 15 of upper side of contour of the two holes 14a, 14b for abrasion detection line is larger than 1° from a width direction of the trolley wire body 10 and inclines at angle of 13°or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a contact wire incorporating a wear detection wire. [Background technology]

[0002] Conventionally, a trolley wire incorporating an optical fiber as a wear detection wire is known (see, for example, Patent Document 1). In such a trolley wire incorporating an optical fiber, as wear progresses, the optical fiber breaks before reaching a set wear limit position, and the wire break detection system is activated to detect that the trolley wire body has worn down to a point close to its usage limit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-88694 A Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, oblique wear occurs in contact wires that are strung on curved sections of tracks, where the wear surface is inclined. In this case, as wear progresses, one of the two optical fibers embedded on the left and right sides of the contact wire breaks first, but the volume of the contact wire body remaining at this point is smaller than the volume of the contact wire body remaining when the optical fiber breaks due to normal wear, where the wear surface becomes almost horizontal.

[0005] In other words, when oblique wear occurs, the optical fiber breaks while the contact wire body still has a sufficient volume for use, and the contact wire must be replaced with a new one. Therefore, when a conventional contact wire with an optical fiber is strung in a section of a track where oblique wear occurs, the replacement life is shortened.

[0006] The object of the present invention is to provide a trolley wire having a built-in wear detection wire, which can suppress a decrease in re-laying life when the trolley wire is strung in a section where oblique wear occurs. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a trolley wire comprising a trolley wire body having two wear detection wire holes provided on both sides of a center line therein, and two wear detection wires accommodated in the two wear detection wire holes, wherein, in a radial cross section of the trolley wire body, a common circumtangent on the upper side of the contours of the two wear detection wire holes is inclined at an angle greater than 1° and less than 13° from the width direction of the trolley wire body. Effect of the Invention

[0008] According to the present invention, a trolley wire having a built-in wear detection wire can be provided, which can suppress a decrease in re-laying life when the trolley wire is strung in a section where oblique wear occurs. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a radial cross-sectional view of a contact wire according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Contact Wire Structure) Fig. 1 is a radial cross-sectional view of a trolley wire 1 according to an embodiment of the present invention. The trolley wire 1 is a trolley wire to be strung on a Shinkansen line, and includes a trolley wire body 10 having wear detection wire holes 14a, 14b provided on both sides of a center wire 18, and two optical fibers 20 as wear detection wires housed in the two wear detection wire holes 14a, 14b. The trolley wire 1 has a length according to the distance of the overhead line section of the Shinkansen line, and is, for example, 500 to 1850 m.

[0011] The trolley wire body 10 of the trolley wire 1 is an irregular round trolley wire having a small arc surface 11 at the top, a large arc surface 12 at the bottom, V-shaped ear grooves 13 between the small arc surfaces 11 and the large arc surfaces 12 on both sides, and linear holes 14a, 14b for wear detection wires provided along the longitudinal direction of the trolley wire body 10 at positions a predetermined distance from the bottom of the large arc surface 12. The external shape of the trolley wire body 10 corresponds to a grooved hard copper trolley wire specified in JISE2101.

[0012] The nominal cross-sectional area of ​​the contact wire body 10 is, for example, 150 mm 2 (150SQ) or more and 170mm 2 (170SQ) or less, typically 170mm 2 Here, the nominal cross-sectional area refers to a calculated cross-sectional area on the assumption that the holes 14a, 14b for the wear detection lines are not provided.

[0013] The trolley wire body 10 is mainly composed of a copper alloy, for example, a Cu-Sn-In based alloy or a Cu-Sn based alloy. Specifically, for example, the trolley wire body 10 is preferably made of a copper alloy containing more than 0.4 mass% and not more than 0.6 mass% tin (Sn), more than 0 mass% and not more than 0.1 mass% indium (In), and the remainder being copper and unavoidable impurities.

[0014] Instead of the optical fiber 20, the wear detection wire may be made of something other than the optical fiber 20, such as an insulated electric wire. The diameter of the wear detection wire is, for example, 0.9 mm or more and 1.55 mm or less, and the diameter when the optical fiber 20 is used as the wear detection wire is, for example, 0.9 mm or more and 1.1 mm or less. An optical fiber 20 having a diameter smaller than 1.1 mm can be obtained, for example, by thinning the outer coating of a conventional optical fiber having a diameter of 1.1 mm.

[0015] When power is supplied to an electric train through the suspended trolley wire 1, the bottom of the large arc surface 12 of the trolley wire body 10 comes into contact with the electric train's current collector, such as a pantograph. As a result, the sliding of the current collector causes the trolley wire body 10 to wear from the bottom of the large arc surface 12. When the wear progresses and the optical fiber 20 breaks, the breakage detection system is activated and detects that the trolley wire body 10 has worn down to near its limit of use.

[0016] As described above, oblique wear, in which the wear surface is inclined, occurs in contact wires that are overhead in curved sections of tracks. This occurs because, when passing through a curve, the vehicle body is inclined due to the difference in height between the inner and outer rails, and the electric train's current collecting device, such as a pantograph, comes into contact with the contact wire from an obliquely downward direction. The inventors have confirmed that in curved sections of Shinkansen tracks, the inclination of the wear surface due to oblique wear can reach a maximum of approximately 12° from the horizontal.

[0017] In the trolley wire body 10, a wear detection wire hole 14a and a wear detection wire hole 14b are provided on both sides of a center line 18 of the trolley wire body 10, and each of the two wear detection wire holes 14a, 14b accommodates one optical fiber 20. As shown in Fig. 1, in a cross section in the radial direction (perpendicular to the length direction) of the trolley wire body 10, a common circumstantial line 15 on the upper side of the contours of the two wear detection wire holes 14a, 14b is inclined at an angle of more than 1° and not more than 13° from the width direction of the trolley wire body 10.

[0018] The width direction of the trolley wire body 10 is the horizontal direction in Fig. 1, and is approximately parallel to the horizontal plane when the trolley wire 1 is suspended. The straight line 16 shown in Fig. 1 is a straight line parallel to the width direction of the trolley wire body 10, and the common circumstantial line 15 is inclined at an angle of more than 1° and not more than 13° from the width direction of the trolley wire body 10, which means that the angle θ between the common circumstantial line 15 and the straight line 16 is more than 1° and not more than 13°.

[0019] Here, a dimensional tolerance of 1° is ensured for the angle θ. The angle θ is greater than 1° because the common circumstantial line 15 is intentionally inclined from the width direction of the trolley wire body 10. The angle θ is 13° or less because the maximum value of the angle θ that is actually formed when the design value of the angle θ is 12° is 13°.

[0020] By setting the angle θ within the range of more than 1° and less than 13° in accordance with the maximum inclination of the wear surface of approximately 12° due to inclination wear expected in the section where the contact wire 1 of the Shinkansen line is strung, the inclination of the wear surface and the inclination of the common circumtangent 15 become closer to parallel, thereby reducing the lag in timing at which the two optical fibers 20 housed in the wear detection line holes 14a, 14b break due to wear.

[0021] Therefore, by making the distance D between the common circumtangent 15 and the small arc surface 11 on the straight line 17 shown in Fig. 1 closer to the distance D in a normal trolley wire in which the heights of the two wear detection line holes that are strung in sections with few curves are the same (angle θ is 0°), the remaining volume of the trolley wire body 10 when the optical fiber 20 is broken due to wear can be made equivalent to that of a normal trolley wire. Here, the straight line 17 is a straight line perpendicular to the common circumtangent 15 that passes through the center O of the trolley wire body 10 in the radial cross section of the trolley wire body 10.

[0022] In other words, the trolley wire 1 can be used efficiently near its usable limit before the optical fiber 20 breaks in sections of the Shinkansen track where oblique wear occurs, and can ensure a replacement lifespan close to that of normal trolley wires used in sections where normal wear occurs where the wear surface is nearly horizontal.

[0023] In addition, by making the height of the wear detection wire hole 14a, which is provided at the lower position of the two wear detection wire holes 14a, 14b, equal to the height of the wear detection wire holes of a normal trolley wire, which has the same height as the two wear detection wire holes, the timing at which the optical fiber 20 housed in the wear detection wire hole 14a breaks is almost equal to the timing at which the optical fiber housed in a normal trolley wire breaks, even in the case of normal wear in which the wear surface is nearly horizontal, and a replacement life close to that of a normal trolley wire can be ensured. 2 In this case, the distance L in the height direction from the upper end of the trolley wire body 10 to the wear detection line hole 14a is a In this case, the distance L of the wear detection line hole 14b from the upper end of the trolley wire body 10 in the height direction is set to within the range of 11.0 mm ± 0.2 mm. b is set within the range of 10.05 mm±0.2 mm, for example. a , L b A dimensional tolerance of 0.2 mm is ensured.

[0024] In addition, the above-mentioned Patent Document 1 discloses a configuration in which the left and right optical fibers are positioned differently in the vertical direction, but does not disclose the specific positional relationship, and since the purpose of the configuration is to suppress the decrease in strength of the trolley wire by providing an optical fiber storage groove and to perform two-stage detection of wear, it does not have the effect of suppressing the decrease in replacement life when the trolley wire is strung in a section where oblique wear occurs, such as the trolley wire 1 in the embodiment of the present invention.

[0025] When the trolley wire 1 is used in a section where the inclination angle of the wear surface due to inclination wear is the largest at 12°, it is preferable to set the angle θ within a range of 11° to 13°. In other words, it is preferable that the common circumscribing line 15 is inclined at an angle of 11° to 13° from the width direction of the trolley wire body 10.

[0026] 1, the height of the left wear detection wire hole 14a is lower than the height of the right wear detection wire hole 14b, but when viewed from the opposite side in the longitudinal direction of the trolley wire 1, the height of the left wear detection wire hole 14b is higher than the height of the right wear detection wire hole 14a. For this reason, the orientation of the trolley wire 1 can be set so that the inclination direction of the common circumtangent 15 coincides with the inclination direction of the wear surface according to the bending direction of the curve in the section of the Shinkansen track where the trolley wire 1 is strung.

[0027] In the trolley wire 1, for example, when the wear detection wire is located above the holes 14a and 14b for the wear detection wire, the position of the lower end of the body of the wear detection wire (the conductor in the case of an insulated electric wire, or the core and its outer cladding in the case of an optical fiber) can be considered as the wear detection position. In this case, the distance L a , L b The wear detection position is a position shifted downward from the upper end position of the wear detection wire holes 14a, 14b by the diameter of the wear detection wire body and the thickness of the coating. For example, if the nominal cross-sectional area of ​​the trolley wire body 10 is 170 mm 2 and the distance L a is 11.0 mm, distance L b When an insulated electric wire having a thickness of 10.05 mm, a body diameter of 0.75 mm, and a coating thickness of 0.40 mm is used as the wear detection wire, the wear detection position by the insulated electric wire accommodated in the wear detection wire hole 14a is 12.15 mm in the height direction from the upper end of the trolley wire body 10, and the wear detection position by the insulated electric wire accommodated in the wear detection wire hole 14b is 11.20 mm in the height direction from the upper end of the trolley wire body 10.

[0028] (Effects of the embodiment) According to the trolley wire 1 of the embodiment of the present invention, by setting the positions of the wear detection line holes 14a and 14b so as to reduce the timing difference between when the two optical fibers 20 break when oblique wear occurs, it is possible to suppress a decrease in the replacement life when the trolley wire is strung in a section where oblique wear occurs.

[0029] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiment will be described by using the reference numerals and the like in the embodiment. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiment.

[0030] [1] A trolley wire (1) comprising a trolley wire body (10) having two wear detection wire holes (14a, 14b) provided on both sides of a center wire (18) therein, and two wear detection wires (20) accommodated in the two wear detection wire holes (14a, 14b), wherein in a radial cross section of the trolley wire body (10), a common circumstantial line (15) above the contours of the two wear detection wire holes (14a, 14b) is inclined at an angle greater than 1° and less than 13° from the width direction of the trolley wire body 10.

[0031] [2] The trolley wire (1) described in [1] above, wherein the common circumferential tangent (15) is inclined at an angle of 11° or more and 13° or less from the width direction of the trolley wire body (10).

[0032] [3] The nominal cross-sectional area of ​​the contact wire body (10) is 170 mm 2 and the distance (L) in the height direction from the upper end of the trolley wire body (10) to the wear detection wire hole (14a) that is provided at the lower position of the two wear detection wire holes (14a, 14b) is a ) is within the range of 11.0 mm ± 0.2 mm.

[0033] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit and scope of the invention.

[0034] In addition, the above-described embodiments do not limit the scope of the invention according to the claims. Also, it should be noted that not all of the combinations of features described in the embodiments are essential to the means for solving the problems of the invention. [Explanation of symbols]

[0035] 1 Contact wire 10 Contact wire body 14a, 14b Holes for wear detection wire 15 Common external tangent 18 Center line 20 Optical Fiber

Claims

1. A contact wire body having two wear detection wire holes provided on both sides of a center wire therein; Two wear detection wires housed in the two wear detection wire holes; Equipped with In a radial cross section of the trolley wire body, an upper common circumferential tangent of contours of the two wear detection wire holes is inclined at an angle of more than 1° and not more than 13° from a width direction of the trolley wire body. Trolley wire.

2. The common circumferential tangent is inclined at an angle of 11° or more and 13° or less from the width direction of the contact wire body. The contact wire according to claim 1.

3. The nominal cross-sectional area of ​​the contact wire body is 170 mm ２ and The distance in the height direction from the upper end of the trolley wire body to the wear detection wire hole provided at the lower position of the two wear detection wire holes is within a range of 11.0 mm ± 0.2 mm. The trolley wire according to claim 1 or 2.

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