JP6828282B2 - Tram line - Google Patents

Description

The present invention relates to a trolley wire having an optical fiber as a wear detection wire.

Conventionally, a trolley wire containing an optical fiber having an optical fiber as a wear detection wire is known (see, for example, Patent Document 1). When the trolley wire with the built-in wear detection wire made of metal wire is worn, it is necessary to manually check the worn part, but when the trolley wire with the built-in wear detection wire made of optical fiber is worn, the worn part is high. Remote detection is possible with accuracy.

Further, the wear detection wire made of an optical fiber is not affected by electromagnetic noise unlike the wear detection wire made of a metal wire (insulated wire). Therefore, wear can be detected even during operation of an electric vehicle consisting of a railroad vehicle such as a Shinkansen in which a large current flows through the trolley line.

Further, the trolley wire described in Patent Document 1 is wound horizontally around a winding drum. As a result, it is possible to suppress the occurrence of wavy wear caused by the wavy trolley wire after the overhead wire.

Japanese Unexamined Patent Publication No. 2004-34800

However, when a trolley wire containing two optical fibers is wound horizontally around a winding drum like the trolley wire described in Patent Document 1, compression strain is generated in the optical fiber closer to the winding drum, and the optical fiber from the winding drum Elongation strain occurs in the distant optical fiber.

The compressive strain and elongation strain generated in the optical fiber while being wound around the winding drum are changed to elongation strain and compression strain, respectively, after the overhead wire. In particular, a large elongation strain after the overhead wire greatly affects the life of the optical fiber.

Therefore, one of the objects of the present invention is to provide a trolley wire capable of suppressing a decrease in life due to elongation strain after an overhead wire of a wear detection wire made of an optical fiber.

One aspect of the present invention provides the following trolley wires [1] to [5] in order to achieve the above object.

[1] A trolley wire body having a wear detection line groove having a nominal cross-sectional area of 150 mm ² or more and 170 mm ² or less, and a wear detection line made of an optical fiber arranged in the wear detection line groove. A trolley wire having a radial cross-sectional area of the wear detection line, which is 30% or more and 40% or less of the effective cross-sectional area of the wear detection line groove.

[2] The trolley wire according to the above [1], wherein the wear detection wire has a diameter of 1.1 mm, and the effective diameter of the wear detection wire groove is 1.80 mm or more and 1.95 mm or less.

[3] The above-mentioned [1] or [2], wherein the distance between the upper end of the wear detection wire groove and the upper end of the trolley wire main body in the height direction of the trolley wire main body is 8 mm or more and 13 mm or less. Tram line.

[4] Any of the above [1] to [3], wherein the trolley wire main body has two grooves for the wear detection line, and the wear detection line is arranged in each of the two grooves for the wear detection line. Or the trolley wire described in item 1.

[5] A trolley wire main body having a wear detection line groove having a nominal cross-sectional area of 150 mm ² or more and 170 mm ² or less, and a wear detection line made of an optical fiber arranged in the wear detection line groove. The trolley wire has the wear detection line, which is movable with respect to the longitudinal direction of the wear detection line groove when the trolley wire is bent, and the trolley wire is overheaded to form an electric vehicle. A trolley wire arranged in the wear detection line groove so as to be immobile with respect to the longitudinal direction of the wear detection line groove when passing through.

According to the present invention, it is possible to provide a trolley wire capable of suppressing a decrease in life due to elongation strain after an overhead wire of a wear detection wire made of an optical fiber.

FIG. 1 is a radial cross-sectional view of a tram wire according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the periphery of the wear detection line groove of the trolley wire.

[Embodiment]
(Structure of trolley wire)
FIG. 1 is a radial cross-sectional view of the trolley wire 1 according to the embodiment of the present invention. The trolley wire 1 has a trolley wire main body 10 having a wear detection wire groove 14 inside, and a wear detection wire 20 made of an optical fiber arranged in the wear detection wire groove 14.

The trolley wire main body 10 of the trolley wire 1 is a deformed round trolley wire, and is a V-shape between the upper small arc surface 11, the lower large arc surface 12, the small arc surfaces 11 on both sides and the large arc surface 12. It has a shaped ear groove 13 and a wear detection wire groove 14 on the line provided along the longitudinal direction of the trolley wire main body 10 at a position at a predetermined distance from the bottom of the large arc surface 12. The trolley wire main body 10 corresponds to the grooved hard copper trolley wire specified in JISE2101 and EN50149.

The trolley wire main body 10 is mainly composed of a copper alloy, for example, a Cu—Sn—In alloy or a Cu—Sn alloy. The nominal cross-sectional area of the trolley wire body 10 is 150 mm ² (150 SQ) or more and 170 mm ² (170 SQ) or less.

When power is supplied to an electric vehicle consisting of a railroad vehicle such as a Shinkansen traveling at high speed via the trolley line 1, the bottom of the large arc surface 12 of the trolley line main body 10 is a collection of electric vehicles such as pantographs. Contact the electrical equipment. Therefore, the sliding of the current collector causes the trolley wire main body 10 to wear from the bottom of the large arc surface 12. As the wear progresses, the wear detection wire 20 breaks before reaching the set wear limit position 16, the disconnection detection system operates, and it is detected that the trolley wire main body 10 is worn to a point close to the limit. To.

Distance L ₁ in FIG. 1 is a distance between the bottom portion of the trolley wire body 10 before abrasion and wear limit position 16, called wear allowance. Further, the distance L ₂ is the distance between the upper end of the trolley wire main body and the wear limit position 16. The distance L ₂ is called the residual height because it is the height of the remaining trolley wire main body 10 when the trolley wire main body 10 is worn and the bottom surface reaches the wear limit position 16. The distance L is the distance from the upper end to the lower end of the trolley wire main body 10, and is equal to the sum of the distance L ₁ and the distance L ₂ .

The wear detection line groove 14 is provided at a position where the position of the upper end thereof coincides with the wear limit position 16 of the trolley wire main body 10. In the example shown in FIG. 1, a total of two wear detection line grooves 14 are provided on both sides of the center line 30 of the trolley wire main body 10, and wear detection is performed in each of the two wear detection line grooves 14. Line 20 is arranged. By using the two wear detection lines 20, wear can be detected even when uneven wear occurs.

The distance L _2, which is the remaining height of the trolley wire main body 10, is set to 8 mm or more and 13 mm or less in order to adapt to a trolley wire having an overhead wire tension of up to 2.5 tons, for example. In this case, the distance between the upper end of the wear detection wire groove 14 and the upper end of the trolley wire main body 10 in the height direction of the trolley wire main body 10 is 8 mm or more and 13 mm or less.

The trolley wire 1 is usually wound horizontally around a winding drum in order to suppress the occurrence of wavy wear after the overhead wire. That is, the center line 30 of the trolley wire main body 10 is wound so as to be parallel to the side surface of the body of the winding drum.

FIG. 2 is an enlarged cross-sectional view of the periphery of the wear detection line groove 14 of the trolley wire 1. The circle 15 represented by the dotted line in the wear detection line groove 14 in FIGS. 1 and 2 is the largest perfect circle included in the cross section of the wear detection line groove 14, and the diameter D of the circle 15 is the wear detection line. The effective diameter of the groove 14 is called, and the area of the circle 15 is called the effective cross-sectional area of the groove 14 for the wear detection line.

The radial cross-sectional area of the wear detection line 20 is 30% or more and 40% or less of the effective cross-sectional area of the wear detection line groove 14.

The smaller the radial cross-sectional area of the wear detection line 20 with respect to the effective cross-sectional area of the wear detection line groove 14, the smaller the friction between the inner surface of the wear detection line groove 14 and the wear detection line 20. Therefore, when the trolley wire 1 is bent, the wear detection wire 20 becomes easy to move in the longitudinal direction of the wear detection wire groove 14, and the amount of strain generated in the wear detection wire 20 is reduced.

When the radial cross-sectional area of the wear detection line 20 is 40% or less of the effective cross-sectional area of the wear detection line groove 14, the maximum value of the elongation strain generated in the wear detection line 20 after the overhead wire of the trolley wire 1 is reached. Can be suppressed to 0.35% or less. The smaller the amount of elongation strain generated in the wear detection wire 20 after the overhead wire of the trolley wire 1, the longer the life of the wear detection wire 20 can be extended. When the maximum value of this amount of elongation strain is 0.35% or less, for example, When the screening level of the wear detection line 20 made of optical fiber (according to the screening test of JIS C 6821 6) is 1%, the life of the wear detection line 20 increases the probability of exceeding 10 years.

In particular, when the total length of the trolley wire 1 is 2000 m or less and the radial cross-sectional area of the wear detection wire 20 is 40% or less of the effective cross-sectional area of the wear detection wire groove 14, the longitudinal direction of the trolley wire 1 The entire area along the line is a region called a movable area in which the wear detection line 20 can move with respect to the longitudinal direction of the wear detection line groove 14. As a result, the wear detection wire 20 in the trolley wire 1 is uniformly extended in all regions along the longitudinal direction.

The reason why the maximum value is considered instead of the average value of the elongation strain amount is that if there is even one point in the wear detection line 20 where the elongation strain amount exceeds the limit, a disconnection occurs at that point.

When the radial cross-sectional area of the wear detection line 20 exceeds 40% of the effective cross-sectional area of the wear detection line groove 14, the maximum value of the elongation strain generated in the wear detection line 20 after the overhead wire of the trolley wire 1 is set to 0. It is difficult to keep it below .35%. In particular, when the trolley wire 1 is long (for example, 1000 m or more), the region called the immovable region where the wear detection wire 20 does not move becomes large with respect to the longitudinal direction of the wear detection wire groove 14, and thus this elongation strain It is more difficult to keep the maximum amount below 0.35%.

When the trolley wire 1 is wound horizontally around the winding drum, compression strain is generated in the wear detection wire 20 closer to the winding drum. This compressive strain changes to elongation strain after the overhead wire of the trolley wire 1, but when the radial cross-sectional area of the wear detection wire 20 is 40% or less of the effective cross-sectional area of the wear detection wire groove 14, the amount of this elongation strain The maximum value of can be suppressed to 0.35% or less.

On the other hand, if the radial cross-sectional area of the wear detection line 20 is too small with respect to the effective cross-sectional area of the wear detection line groove 14, the friction between the inner surface of the wear detection line groove 14 and the wear detection line 20 becomes extremely small. Therefore, when the trolley wire 1 is overheaded and the electric vehicle passes through it, a phenomenon called a wave riding phenomenon occurs in which the wear detection line 20 moves in the longitudinal direction of the wear detection line groove 14.

Therefore, by setting the radial cross-sectional area of the wear detection line 20 to 30% or more of the effective cross-sectional area of the wear detection line groove 14, the surfing phenomenon can be suppressed.

In order to satisfy the above-mentioned condition that "the radial cross-sectional area of the wear detection line 20 is 30% or more and 40% or less of the effective cross-sectional area of the wear detection line groove 14," for example, the diameter of the wear detection line 20 is set to 1. The effective diameter of the wear detection line groove 14 can be 1.80 mm or more and 1.95 mm or less.

Further, in order to further reduce the amount of elongation strain after the trolley wire 1 is laid, the radial cross-sectional area of the wear detection wire 20 is 37.3% or less of the effective cross-sectional area of the wear detection wire groove 14. It is preferably 33.5% or less, and most preferably 31.8% or less. When the diameter of the wear detection line 20 is 1.1 mm, it is more preferable that the effective diameter of the wear detection line groove 14 is 1.90 mm or more and 1.95 mm or less.

The amount of elongation strain generated in the wear detection wire 20 varies depending on the position of the wear detection wire groove 14 in the trolley wire 1, but in the trolley wire 1 having a nominal cross-sectional area of 150 mm ² or more and 170 mm ² or less. Is an overhead wire regardless of the position of the wear detection line groove 14 as long as the radial cross-sectional area of the wear detection line 20 is within the range of 30% or more and 40% or less of the effective cross-sectional area of the wear detection line groove 14. The maximum value of the elongation strain amount of the later wear detection line 20 can be suppressed to 0.35% or less.

(Effect of embodiment)
According to the present embodiment, it is possible to suppress the elongation strain of the wear detection wire made of the optical fiber after the overhead wire of the trolley wire and extend the life of the wear detection wire. In addition, it is possible to suppress the surfing phenomenon after the tram line is overheaded. According to the present embodiment, not only the elongation strain of the wear detection wire generated after winding the trolley wire around the winding drum (the body diameter which is the diameter of the portion where the trolley wire is wound is 900 mm to 1200 mm), but also the trolley wire. It is possible to suppress the overall elongation and strain of the wear detection line caused by bending. Further, according to the present embodiment, even when the temperature and humidity in the environment where the trolley wire is used change according to the change of seasons such as summer and winter, the amount of elongation strain of the wear detection wire after the overhead wire is changed. The maximum value of can be suppressed to 0.35% or less.

In order to examine the optimum conditions for the size of the wear detection wire groove 14, the trolley wire 1 according to the embodiment was prototyped and evaluated.

In this embodiment, a trolley wire having a nominal cross-sectional area of 170 mm ² is used as the trolley wire main body 10, and the position of the wear detection wire groove 14 on the trolley wire main body 10 is overheaded with a tension of 2 tons. ^It was set to the position on the trolley line of ² . The diameter of the wear detection wire 20 made of an optical fiber was fixed at 1.1 mm.

The trolley wire 1 having the above structure is wound horizontally around a winding drum having a body diameter of 1030 mm, and then overheaded with a tension of 2 tons, and the amount of elongation strain of the wear detection wire 20 is measured by an optical fiber analyzer (BOTDR method). did.

The evaluation results are shown in Table 1 below. The “area ratio” in Table 1 means the ratio of the radial cross-sectional area of the wear detection line 20 to the effective cross-sectional area of the wear detection line groove 14.

As shown in Table 1, when the diameter of the wear detection line 20 is 1.1 mm, the extension of the wear detection line 20 is when the effective diameter of the wear detection line groove 14 is 1.8 mm or more and 1.95 mm or less. The maximum value of the strain amount could be suppressed to 0.35% or less.

Further, when the radial cross-sectional area of the wear detection line 20 is about 40% or less of the effective cross-sectional area of the wear detection line groove 14, the maximum value of the elongation strain amount of the wear detection line 20 is 0.35%. I was able to suppress it to the following. The relationship between this area ratio (the ratio of the radial cross-sectional area of the wear detection line 20 to the effective cross-sectional area of the wear detection line groove 14) and the maximum value of the elongation strain amount of the wear detection line 20 is the wear detection line 20. It holds regardless of the diameter of.

Further, in the above evaluation, a trolley wire having a nominal cross-sectional area of 170 mm ² was used as the trolley wire main body 10, but a similar evaluation was performed using a trolley wire having a nominal cross-sectional area of 150 mm ² as the trolley wire main body 10. Even if there is, the maximum value of the elongation strain amount can be suppressed to 0.35% or less.

Although the embodiments and examples of the present invention have been described above, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made without departing from the gist of the invention.

Further, the embodiments and examples described above do not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments and examples are essential to the means for solving the problems of the invention.

1 Tram wire 10 Tram wire body 12 Large arc surface 14 Wear detection line groove 20 Wear detection line

Claims (1)

A trolley wire containing a Cu-Sn-In alloy or a Cu-Sn alloy as a main component and being overheaded with a tension of 2 tons from a state of being wound horizontally on a winding drum.
A trolley wire body having a nominal cross-sectional area having a groove for wear detection line therein 1 70 mm ^2,
A wear detection line made of an optical fiber arranged in the wear detection line groove and
Have,
The radial cross-sectional area of the wear detection line is 31.8% or more and 33.5% or less of the effective cross-sectional area of the wear detection line groove.
Tram line.

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