JP7533735B2 - Heavy simple overhead line monitoring system - Google Patents

Description

The present invention relates to an optical fiber-reinforced messenger wire, a heavy simple overhead line, and a monitoring system for the heavy simple overhead line.

In recent years, the overhead electric train line (overhead train line) system of the Shinkansen has been shifting from heavy compound overhead lines to heavy simple overhead lines in order to achieve maintenance-free operation and increase speed. Heavy simple overhead lines do not use the auxiliary catenary wires used in heavy compound overhead lines, so the tension on the contact wires and catenary wires is high, resulting in a heavy burden on their strength. Therefore, to ensure safety, it is desirable to constantly monitor the condition of the contact wires using contact wires with optical fiber housed in a groove as an alarm line (see, for example, Patent Document 1).

Patent No. 2738127

However, when the heavy compound catenary is changed to the heavy simple catenary, the strength burden increases not only on the contact wire but also on the messenger wire. The nominal cross-sectional area of the messenger wire of the heavy simple catenary is 200 ^mm2 (cross-sectional area is 200 sq), which is larger than the nominal cross-sectional area of the messenger wire of the heavy compound catenary, ¹⁵⁰ mm2, but the strength may still be insufficient due to the high catenary tension. Even in this case, it is not preferable to increase the nominal cross-sectional area of the messenger wire to more than 200 ^mm2 due to the increase in mass and the decrease in workability. Therefore, in order to ensure the safety of the catenary, it is preferable to constantly monitor the condition of the messenger wire in the same way as the contact wire.

Therefore, the object of the present invention is to provide a heavy simple overhead line monitoring system that can constantly monitor the condition of the contact wire and the catenary.

In order to solve the above problems, the present invention provides an optical fiber-containing messenger wire, comprising: an optical fiber housing tube in which an optical fiber detection line is housed inside a hollow tube; and a messenger wire body made of a plurality of strands twisted together so as to surround the periphery of the optical fiber housing tube;
and an optical fiber contact wire that houses the second optical fiber detection wire therein,
a heavy simple overhead line in which the optical fiber-reinforced contact wire is supported by the optical fiber-reinforced messenger wire via a hanger;
The present invention provides a heavy simple overhead line monitoring system comprising: an optical fiber temperature distribution measuring device that is optically connected to the optical fiber detection line included in the optical fiber-reinforced messenger line and a second optical fiber detection line included in the optical fiber-reinforced trolley wire, and measures the longitudinal temperature distribution of the optical fiber detection line and the second optical fiber detection line.

The present invention provides a heavy simple overhead contact line monitoring system that can constantly monitor the condition of the contact wire and the catenary.

FIG. 1 is a schematic diagram of a heavy simple overhead contact wire according to an embodiment of the present invention. Fig. 2(a) is a radial cross-sectional view of an example of an optical fiber-reinforced messenger wire according to an embodiment of the present invention, and Fig. 2(b) is a radial cross-sectional view of an example of an optical fiber housing tube included in the optical fiber-reinforced messenger wire. FIG. 3 is a radial cross-sectional view of an optical fiber trolley wire according to an embodiment of the present invention. FIG. 4 is a schematic diagram showing a configuration of an overhead contact line monitoring system according to an embodiment of the present invention.

[Embodiment]
Fig. 1 is a schematic diagram of a heavy simple overhead contact line 1 according to an embodiment of the present invention. The heavy simple overhead contact line 1 includes an optical fiber-reinforced trolley wire 20 for supplying electric power to a railway vehicle, and an optical fiber-reinforced messenger wire 10 that supports the optical fiber-reinforced trolley wire 20 by suspending it with a hanger 30.

(Configuration of optical fiber-reinforced messenger wire)
Fig. 2(a) is a radial cross-sectional view of an example of an optical fiber-reinforced messenger wire 10 according to an embodiment of the present invention. Fig. 2(b) is a radial cross-sectional view of an example of an optical fiber housing tube 12 included in the optical fiber-reinforced messenger wire 10.

The optical fiber-containing messenger wire 10 comprises an optical fiber housing tube 12 in which an optical fiber detection wire 122 is housed inside (hollow portion) 123 of a hollow tube 121, and a messenger wire body 11 consisting of multiple strands 111 twisted together to surround the optical fiber housing tube 12.

The condition of the optical fiber-containing messenger wire 10 can be constantly monitored by measuring the temperature of the optical fiber detection wire 122 contained therein. Therefore, even if the nominal cross-sectional area of the messenger wire main body 11 and the optical fiber housing tube 12 is 200 ^mm2 , the same as that of the conventional heavy simple messenger wire, it is easy to prevent accidents caused by stretching or damage of the messenger wire. Here, the nominal cross-sectional area of the messenger wire main body 11 and the optical fiber housing tube 12 is an approximation of the cross-sectional area of the strand 111 in the radial direction multiplied by the number of strands 111 and then added to the cross-sectional area of the hollow tube 121 in the radial direction (calculated cross-sectional area). For example, when the calculated cross-sectional area is 192 to 209 ^mm2 , the nominal cross-sectional area is 200 ^mm2 .

The strands 111 constituting the messenger line body 11 are usually twisted together in multiple layers by concentric twisting, as shown in the example of FIG. 2(a). In this case, the messenger line 10 has a single optical fiber housing tube 12 in the center, and the messenger line body 11 has a multi-layer structure in which multiple strands 111 are twisted together concentrically around the optical fiber housing tube 12. The strands 111 may be twisted either right-handed or left-handed. It is also preferable that the messenger line body 11 be twisted in a different direction, with right-handed and left-handed layers alternately arranged in multiple stages.

The wires 111 constituting the messenger line body 11 are made of, for example, copper or a copper alloy, and have properties such as tensile strength (strength of wire) that meet the standard of "JIS C 3101 Hard copper wire for electrical use." For example, the tensile strength is 434 MPa or more when the diameter is 2.6 mm, 433 MPa or more when the diameter is 2.7 mm, 432 MPa or more when the diameter is 2.8 mm, 427 MPa or more when the diameter is 3.2 mm, 424 MPa or more when the diameter is 3.5 mm, and 422 MPa or more when the diameter is 3.7 mm.

Furthermore, the number of strands 111 constituting the messenger line body 11 is set according to the radial cross-sectional areas of the strands 111 and hollow tube 121 so that the nominal cross-sectional area of the messenger line body 11 and the optical fiber housing tube 12 is ²⁰⁰ mm2. For example, if the diameter of the strands 111 is 3.2 to 3.7 mm and the outer diameter and thickness of the hollow tube 121 are 3.2 to 3.7 mm and 1.0 to 1.1 mm, respectively, the nominal cross-sectional area of the messenger line body 11 and the optical fiber housing tube 12 will be ²⁰⁰ mm2 by using 18 strands 111 (the total number of strands 111 and hollow tubes 121 is 19) as shown in the example of FIG.

Also, for example, when the diameter of the strand 111 is 2.6 mm or more and 2.8 mm or less and the outer diameter of the hollow tube 121 is 2.6 mm or more and 2.8 mm or less, by using 36 strands 111 (the total number of strands 111 and hollow tubes 121 is 37), the nominal cross-sectional area of the messenger line body 11 and the optical fiber housing tube 12 becomes ²⁰⁰ mm2.

Since the wire 111 is formed by drawing a rough wire of a specified diameter, the smaller the diameter, the greater the strength. For example, by changing the diameter of the wire 111 from 3.7 mm to 2.6 mm, the strength can be improved by approximately 3% or more. Therefore, the tensile load of the messenger wire body 11 (the maximum load that the sample can withstand in a tensile test) is greater when 36 wires 111 with a diameter of 2.6 to 2.8 mm (tensile strength of 432 MPa or more) are used than when 18 wires 111 with a diameter of 3.2 to 3.7 mm (tensile strength of 422 MPa or more) are used.

Table 1 below shows examples (examples 1 to 3) of the configuration and characteristics of the optical fiber-reinforced messenger wire 10. The configuration and characteristics of the optical fiber-reinforced messenger wire 10 shown in Table 1 all meet the standard of "JIS C 3105 Hard-hardened copper stranded wire." In Table 1, "strand diameter" refers to the diameter of the strands 111 and the optical fiber housing tube 12, "number of strands" refers to the number of strands 111 plus 1, which is the number of optical fiber housing tubes 12, and "tensile load," "outer diameter," "electrical resistance," and "mass" refer to the tensile load, outer diameter, electrical resistance, and mass of the optical fiber-reinforced messenger wire 10, respectively.

The hollow tube 121 of the fiber housing tube 12 is made of, for example, copper or a copper alloy. The optical fiber detection line 122 housed inside 123 of the hollow tube 121 can be, for example, a normal single-mode optical fiber. The diameter of the optical fiber detection line 122 is, for example, 0.9 to 1.1 mm.

The filling rate of the optical fiber detection line 122 in the optical fiber housing tube 12 is preferably 50% or more and 70% or less. Here, the filling rate of the optical fiber detection line 122 in the optical fiber housing tube 12 is equal to the ratio of the radial cross-sectional area of the optical fiber detection line 122 to the radial cross-sectional area of the interior 123 of the hollow tube 121.

By setting the filling rate of the optical fiber detection line 122 to 70% or less, the degree of bending of the optical fiber detection line 122 at the point where local bending occurs in the optical fiber housing tube 12 can be reduced, and the transmission loss of the optical fiber detection line 122 can be reduced.

In addition, by setting the filling rate of the optical fiber detection line 122 to 50% or more, it is possible to prevent the optical fiber detection line 122 from moving inside the hollow tube 123 due to train vibrations. If the filling rate of the optical fiber detection line 122 is less than 50%, it is possible to prevent the optical fiber detection line 122 from moving inside the hollow tube 123 due to train vibrations by filling the inside 123 of the hollow tube 121 with a filler such as jelly.

The thickness of the hollow tube 121 is set so that it has a strength capable of withstanding the twisting load when the wires 111 are twisted around the hollow tube 121. For example, if the messenger line body 11 is made of 18 wires 111 and the wires 111 have a diameter of 3.2 to 3.7 mm, and the hollow tube 121 is a copper or copper alloy tube with a thickness of 1.0 mm or more, the hollow tube 121 can withstand the twisting load when the wires 111 are twisted around it.

The outer diameter of the hollow tube 121 is preferably equal to the diameter of the strand 111, since the hollow tube 121 serves as the center line of the stranded wire.

Table 2 below shows three examples (examples 1 to 3) of the configuration and characteristics of the optical fiber housing tube 12, and a comparative example in which the transmission loss of the optical fiber detection line 122 is large. In Table 2, "outer diameter," "inner diameter," and "thickness" are the outer diameter, inner diameter, and thickness of the hollow tube 121, respectively, "optical fiber diameter" is the diameter of the optical fiber detection line 122, "filling rate" is the filling rate of the optical fiber detection line 122, "jelly" is the presence or absence of jelly as a filler filled inside 123 of hollow tube 121, and "transmission loss" is the transmission loss of the optical fiber detection line 122 when the strands 111 are 18 copper wires with a diameter of 3.7 mm.

In Examples 1 to 3 in Table 2, the thickness of the hollow tube 121 is 1.0 mm or more, and the filling rate of the optical fiber detection line 122 is 70% or less, so the transmission loss of the optical fiber detection line 122 is kept low at 0.5 dB/km or less. On the other hand, in the comparative example, the thickness of the hollow tube 121 is less than 1.0 mm, so the transmission loss of the optical fiber detection line 122 is large.

(Configuration of optical fiber contact wire)
3 is a radial cross-sectional view of the optical fiber-containing trolley wire 20 according to the embodiment of the present invention. The optical fiber-containing trolley wire 20 has a trolley wire body 21 and an optical fiber detection wire 22 housed in a hole 214 provided along the longitudinal direction inside the trolley wire body 21. The condition of the optical fiber-containing trolley wire 20 can be constantly monitored by measuring the temperature of the optical fiber detection wire 22 contained therein.

The trolley wire body 21 is a deformed round trolley wire corresponding to a grooved hard copper trolley wire specified in, for example, JRS (Japan National Railways Standards), JIS E2101, and EN50149, and has a small arc surface 211 at the top, a large arc surface 212 at the bottom, and V-shaped ear grooves 213 between the small arc surfaces 211 and the large arc surfaces 212 on both sides. The trolley wire body 21 is mainly composed of a copper alloy, for example, a Cu-Sn-In based alloy or a Cu-Sn based alloy. The nominal cross-sectional area of the trolley wire body 21 is, for example, 150 mm ² or 170 mm ² .

The hole 214 is preferably provided below the vertical midpoint of the trolley wire body 21 (towards the large arc surface 212). This is to make it easier to detect temperature changes at the bottom of the trolley wire body 21 that comes into contact with the pantograph, and to make it easier to predict the formation of ice or frost at the bottom of the trolley wire body 21.

In the example shown in FIG. 3, two holes 214 are included in the trolley wire body 21. In this case, the optical fiber sensing lines 22 housed in the two holes 214 are optically connected at the end of the optical fiber-containing trolley wire 20 opposite the optical fiber temperature distribution measuring device 40, and are folded back to form a single optical fiber that is optically continuous and passes back and forth through the optical fiber-containing trolley wire 20.

Even if the optical fiber detection wire 22 has only one hole 214, i.e., the optical fiber detection wire 22 penetrates the optical fiber-containing trolley wire 20 in only one direction, it is possible to measure the temperature of the optical fiber detection wire 22 and monitor the condition of the optical fiber-containing trolley wire 20. However, a reciprocating penetrating configuration has the following advantages. First, two temperature measurements can be obtained at each position on the optical fiber-containing trolley wire 20, improving the accuracy of temperature measurement. In addition, even if part of the optical fiber detection wire 22 is broken due to wear of the trolley wire body 21, the temperature measurement can be continued, so there is no time period during which the temperature cannot be measured until the optical fiber detection wire 22 is repaired or replaced.

(Configuration of the overhead line monitoring system)
Fig. 4 is a schematic diagram showing the configuration of an overhead line monitoring system 100 according to an embodiment of the present invention. The overhead line monitoring system 100 is a system for monitoring the state of the optical fiber-containing messenger wire 10 and the optical fiber-containing trolley wire 20 of the heavy simple overhead line 1, and includes the optical fiber-containing messenger wire 10 that houses an optical fiber detection wire 122 therein, the optical fiber-containing trolley wire 20 that houses an optical fiber detection wire 22 therein, and an optical fiber temperature distribution measuring device that is optically connected to the optical fiber detection wire 122 and the optical fiber detection wire 22 and measures the temperature distribution in the longitudinal direction of the optical fiber detection wire 122 and the optical fiber detection wire 22. Note that Fig. 4 omits the illustration of the configuration other than the optical fiber detection wire 122 and the optical fiber detection wire 22 of the heavy simple overhead line 1.

In the overhead line monitoring system 100, the optical fiber detection line 122 included in the optical fiber-reinforced messenger line 10 is optically connected at its end to the optical fiber temperature distribution measurement device 40 via the optical fiber-reinforced insulator 52 and the optical switch 51. Also, the optical fiber detection line 22 included in the optical fiber-reinforced trolley wire 20 is optically connected at its end to the optical fiber temperature distribution measurement device 40 via the optical fiber-reinforced insulator 53 and the optical switch 51.

The optical fiber temperature distribution measuring device 40 and the optical switch 51 of the overhead line monitoring system 100 are installed, for example, in a substation.

In general, problems can occur with overhead lines, such as damage to the trolley wires and pantographs due to frost on the trolley wires during low temperature periods, and the temperature of the trolley wires and messenger wires rises during high temperature periods or when the schedule is disrupted, causing them to stretch, resulting in a decrease in the tension of the trolley wires and messenger wires that cannot be fully adjusted by the tension adjustment device, causing disruptions to train operations. By measuring the temperature of the trolley wires and messenger wires using the overhead line monitoring system 100, it is possible to detect and respond to signs of frost on the trolley wires and a decrease in tension in the trolley wires and messenger wires.

In addition, since the temperature measurement by the optical fiber detection lines 122, 22 and the optical fiber temperature distribution measurement device 40 is performed using light, it is not affected by electricity and can be performed even during power feeding hours, such as when the train is running. Therefore, the condition of the optical fiber-reinforced catenary wire 10 and the optical fiber-reinforced trolley wire 20 can be constantly monitored.

The optical fiber temperature distribution measurement device 40 sends pulsed light to the optical fiber detection lines 122, 22, and measures the temperature distribution of the optical fiber detection lines 122, 22 using the backscattered light generated in the optical fiber detection lines 122, 22. By switching the connection of the optical fiber temperature distribution measurement device 40 between the optical fiber detection line 122 and the optical fiber detection line 22 using the optical switch 51, it is possible to measure the temperature distribution of both the optical fiber detection line 122 and the optical fiber detection line 22 with a single optical fiber temperature distribution measurement device 40. A specific example of the configuration and operation of the optical fiber temperature distribution measurement device 40 will be described later.

The optical fiber temperature distribution measurement device 40 and the optical switch 51 are optically connected via an optical fiber 54. The optical switch 51 and the optical through insulator 52 are optically connected via an optical fiber 55, and the optical switch 51 and the optical through insulator 53 are optically connected via an optical fiber 56.

The optical insulator 52 is a device for pulling the optical fiber detection line 122 down to the ground in an electrically disconnected state from the catenary line body 11 or hollow tube 121 of the catenary line 10 with optical fiber, and connecting it to the optical fiber 55 extending from the optical switch 51. The optical insulator 53 is a device for pulling the optical fiber detection line 22 down to the ground in an electrically disconnected state from the catenary line body 21 of the catenary line 20 with optical fiber, and connecting it to the optical fiber 56 extending from the optical switch 51.

As shown in FIG. 3, when two holes 214 are included in the trolley wire body 21 and the optical fiber detection line 22 passes back and forth through the optical fiber-containing trolley wire 20, it is preferable that both the forward and return ends of the optical fiber detection line 22 are optically connected to the optical switch 51 as shown in FIG. 4. In this way, when a part of the optical fiber detection line 22 is broken, the optical switch 51 is switched so that the pulsed light emitted from the optical fiber temperature distribution measurement device 40 enters from the unbroken forward and return ends of the optical fiber detection line 22, thereby making it possible to continue measuring the temperature of the entire optical fiber-containing trolley wire 20.

The overhead line monitoring system 100 can also measure the temperature of multiple different heavy simple overhead lines 1, for example, multiple heavy simple overhead lines 1 used on different tracks. In this case, the optical fiber detection lines 122, 22 included in each heavy simple overhead line 1 are optically connected to an optical switch 51. The optical switch 51 can then be used to switch between the multiple optical fiber detection lines 122, 22 connected to the optical fiber temperature distribution measuring device 40, thereby switching the heavy simple overhead line 1 to be subjected to temperature measurement.

Figure 4 shows an example of the basic configuration and operation of the optical fiber temperature distribution measurement device 40 in a block diagram. In the optical fiber temperature distribution measurement device 40, a light source 41 is connected to the input end of an optical splitter 42, an optical fiber 54 is connected to the input/output end of the optical splitter 42, an opto-electrical converter (hereinafter referred to as an O/E converter) 43a is connected to one output end of the optical splitter 42, and an O/E converter 43b is connected to the other output end of the optical splitter 42.

The output terminal of the O/E converter 43a is connected to the calculation control unit 46 via an amplifier 44a and an A/D converter 45a, and the output terminal of the O/E converter 43b is connected to the calculation control unit 46 via an amplifier 44b and an A/D converter 45b. The calculation control unit 46 is also connected to the light source 41 via a pulse generating unit 47.

For example, a laser diode is used as the light source 41, which emits pulsed light corresponding to a timing signal from the calculation control unit 46 input via the pulse generating unit 47. The optical splitter 42 takes in the pulsed light emitted from the light source 41 from its input end, and emits the pulsed light from its input/output end to the optical fiber detection lines 122, 22 via the optical switch 51 and the optical through insulators 52, 53. The optical splitter 42 also takes in the backward Raman scattered light of the pulsed light propagating through the optical fiber detection lines 122, 22 from its input/output end, and separates it by wavelength into Stokes light and anti-Stokes light.

For example, photodiodes are used as the O/E converters 43a and 43b. Stokes light emitted from one output end of the optical splitter 42 is incident on the O/E converter 43a, and anti-Stokes light emitted from the other output end of the optical splitter 42 is incident on the O/E converter 43b, which each output an electrical signal corresponding to the incident light.

Amplifiers 44a and 44b amplify the electrical signals output from O/E converters 43a and 43b, respectively. A/D converters 45a and 45b convert the signals output from amplifiers 44a and 44b, respectively, into digital signals.

The calculation control unit 46 calculates temperature from the intensity ratio of two components of the backscattered light, i.e., the Stokes light and the anti-Stokes light, based on the digital signals output from the A/D converters 45a, 45b, and displays the temperature distribution along the length direction of the optical fiber detection lines 122, 22 on a display means (not shown) based on the time series. The calculation control unit 46 stores the relationship between the intensity ratio and the temperature in the form of a table or an equation in advance. In addition, in order to obtain the temperature of the optical fiber detection lines 122, 22 for each geographical position, the relationship between the positions on the optical fiber detection lines 122, 22 and the geographical positions may be stored in the calculation control unit 46 in the form of a table or an equation.
The arithmetic and control unit 46 also sends a timing signal to the light source 41 to control the timing of the light pulse emitted from the light source 41 .

Next, the principle of temperature distribution measurement will be described. When the signal intensity of the Stokes light and the anti-Stokes light is expressed as a function of time based on the light emission timing in the light source 41, since the speed of light in the optical fiber detection lines 122, 22 is known, it can be replaced with a function of distance along the optical fiber detection lines 122, 22 based on the light source 41. That is, the relationship between the position of the optical fiber detection lines 122, 22 and the intensity of the generated Stokes light and anti-Stokes light can be obtained. Meanwhile, both the anti-Stokes light intensity I ₁ and the Stokes light intensity I ₂ depend on the temperature of the optical fiber detection lines 122, 22, and further, the intensity ratio I ₁ /I ₂ of both lights also depends on the temperature of the optical fiber detection lines 122, 22. Therefore, the temperature distribution of the optical fiber detection lines 122, 22 can be known from the relationship between the position of the optical fiber detection lines 122, 22 and the intensity ratio I ₁ /I ₂ .

(Example of operation of the overhead line monitoring system)
The following describes examples of the operation of the overhead line monitoring system 100. In a first example, while the overhead line monitoring system 100 continues to monitor the temperature distribution of the optical fiber detection wire 122 housed in the optical fiber-reinforced messenger wire 10 and the optical fiber detection wire 22 housed in the optical fiber-reinforced trolley wire 20, if the temperature at any point of at least one of the optical fiber detection wire 122 and the optical fiber detection wire 22 becomes 90° C. or higher (hereinafter referred to as the first condition), it is determined that the heavy simple overhead line 1 is in a high temperature state.

The first condition above is typically met when the air temperature is high and trains are overcrowded, causing the heavy simple overhead line 1 to be in a high temperature state. Therefore, when the overhead line monitoring system 100 determines that the heavy simple overhead line 1 is in a high temperature state because the first condition is met, measures such as thinning out train operations can be implemented based on that determination.

In the second example, while the overhead line monitoring system 100 continues to monitor the temperature distribution of the optical fiber detection line 122 housed in the optical fiber-reinforced messenger line 10 and the optical fiber detection line 22 housed in the optical fiber-reinforced trolley wire 20, if the temperature at any point on both the optical fiber detection line 122 and the optical fiber detection line 22 becomes 0°C or lower (hereinafter referred to as the second condition), it determines that the heavy simple overhead line 1 is in a low temperature state.

The second condition above is typically met when frost forms on the optical fiber-reinforced messenger wire 10 or the optical fiber-reinforced trolley wire 20 under conditions such as low temperature, high humidity, and low wind speed, causing the heavy simple overhead line 1 to be in a low temperature state. Therefore, when the overhead line monitoring system 100 determines that the heavy simple overhead line 1 is in a low temperature state because the second condition is met, measures such as operating a defrosting vehicle can be implemented based on that determination.

In the third example, while the overhead line monitoring system 100 continues to monitor the temperature distribution of the optical fiber detection line 122 housed in the optical fiber-reinforced messenger line 10 and the optical fiber detection line 22 housed in the optical fiber-reinforced trolley wire 20, if the temperature at any point on both the optical fiber detection line 122 and the optical fiber detection line 22 is 100°C or higher for more than three consecutive minutes (hereinafter referred to as the third condition), it is determined that the heavy simple overhead line 1 is in a locally heated state.

The third condition above is met, for example, when a train stops at an air section due to a malfunction or the like, causing two overhead lines to be short-circuited by the pantograph, causing the heavy simple overhead line 1 to be in a locally heated state. Therefore, when the overhead line monitoring system 100 determines that the heavy simple overhead line 1 is in a locally heated state because the third condition is met, measures such as cutting off the power supply to the heavy simple overhead line 1 can be implemented based on that determination.

When the above first to third conditions are satisfied, the overhead line monitoring system 100 determines the state of the heavy simple overhead line 1, specifically, for example, by an overhead line state determination device 60 connected to the optical fiber temperature distribution measurement device 40, based on the temperature distribution data of the optical fiber detection lines 122, 22 acquired by the optical fiber temperature distribution measurement device 40. The overhead line state determination device 60 can be, for example, a PC (Personal Computer), and, for example, as shown in FIG. 4, receives temperature distribution data of the optical fiber detection lines 122, 22 from the calculation control unit 46 of the optical fiber temperature distribution measurement device 40 and makes a determination. The result of this determination is displayed, for example, on a display means such as a monitor included in the overhead line state determination device 60.

(Effects of the embodiment)
According to the above embodiment, the conditions of the optical fiber-reinforced catenary wire 10 and the optical fiber-reinforced catenary wire 20 can be constantly monitored by measuring the temperatures of the optical fiber detection wires 122, 22 included in the optical fiber-reinforced catenary wire 10 and the optical fiber-reinforced catenary wire 20. This makes it possible to accurately detect signs of icing and frost on the catenary wire and a decrease in tension of the catenary wire and the catenary wire, and to more reliably avoid problems occurring in the catenary wire than by monitoring only the condition of the catenary wire. Therefore, the monitoring system for the optical fiber-reinforced catenary wire, the heavy simple catenary wire, and the heavy simple catenary wire according to the embodiment of the present invention can be suitably used for, for example, the heavy simple catenary wire of a Shinkansen train.

(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.

[1] An optical fiber-containing messenger line (10) comprising an optical fiber housing tube (12) in which an optical fiber detection line (122) is housed inside (123) of a hollow tube (121), and a messenger line body (11) consisting of multiple strands (111) twisted together to surround the optical fiber housing tube (12).

[2] The optical fiber-reinforced messenger wire (10) according to the above [1], wherein the messenger wire body (11) is made of 18 strands (111), the strands (111) being copper wires or copper alloy wires having a diameter of ^{3.2 to 3.7} mm, the hollow tube (121) being a copper tube or copper alloy tube having a thickness of 1 mm or more, and the nominal cross-sectional area of the optical fiber housing tube (12) and the messenger wire body (11) is 200 mm2.

[3] The optical fiber-reinforced messenger wire (10) according to the above [1], wherein the messenger wire body (11) is made of 36 strands (111), each strand (111) having a diameter of 2.6 to 2.8 mm and a tensile strength of 432 MPa or more, and the nominal cross-sectional area of the optical fiber housing tube (12) and the messenger wire body (11) is 200 ^mm2 .

[4] An optical fiber-reinforced messenger wire (10) described in any one of [1] to [3] above, in which the filling rate of the optical fiber detection wire (122) in the optical fiber housing tube (12) is 50% or more and 70% or less.

[5] An optical fiber-reinforced messenger wire (10) according to any one of [1] to [3] above, in which the filling rate of the optical fiber detection wire (122) in the optical fiber housing tube (12) is less than 50, and the inside (123) of the hollow tube (121) is filled with a filler.

[6] A heavy simple overhead line (1) comprising an optical fiber-containing trolley wire (20) that houses a second optical fiber detection line (22) therein, and an optical fiber-containing messenger wire (10) described in any one of [1] to [5] above, which supports the optical fiber-containing trolley wire (20) via a hanger (30).

[7] A heavy simple overhead line monitoring system (100) including an optical fiber-containing catenary wire (20) that houses a second optical fiber detection wire (22) inside, an optical fiber-containing messenger wire (10) described in any one of [1] to [5] above that supports the optical fiber-containing catenary wire (20) via a hanger (30), and an optical fiber temperature distribution measuring device (40) that is optically connected to the optical fiber detection wire (122) included in the optical fiber-containing catenary wire (10) and the second optical fiber detection wire (22) included in the optical fiber-containing catenary wire (20) and measures the temperature distribution in the longitudinal direction of the optical fiber detection wire (122) and the second optical fiber detection wire (22).

[8] A heavy simple overhead line monitoring system (100) described in [7] above, which determines that the heavy simple overhead line (1) is in a high temperature state when the temperature at any point of at least one of the optical fiber detection line (122) and the second optical fiber detection line (22) is 90°C or higher.

[9] A heavy simple overhead line monitoring system (100) described in [7] or [8] above, which determines that the heavy simple overhead line (1) is in a low temperature state when the temperature at any point of both the optical fiber detection line (122) and the second optical fiber detection line (22) is below 0°C.

[10] A heavy simple overhead line monitoring system (100) described in any one of [7] to [9] above, which determines that the heavy simple overhead line (1) is in a localized heating state when the temperature at any point of both the optical fiber detection line (122) and the second optical fiber detection line (22) is 100°C or higher for more than three consecutive minutes.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention.

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

REFERENCE SIGNS LIST 1 Heavy simple overhead line 10 Messenger line with optical fiber 11 Messenger line body 111 Wire 12 Optical fiber housing tube 121 Hollow tube 122 Optical fiber detection wire 123 Inside 20 Trolley wire with optical fiber 21 Trolley wire body 22 Optical fiber detection wire 30 Hanger 40 Optical fiber temperature distribution measuring device 60 Overhead line state determination device 100 Overhead line monitoring system

Claims (4)

an optical fiber-containing messenger wire including an optical fiber housing tube in which an optical fiber detection line is housed inside a hollow tube, and a messenger wire body made of a plurality of strands twisted together so as to surround the periphery of the optical fiber housing tube;
and an optical fiber contact wire that houses the second optical fiber detection wire therein,
a heavy simple overhead line in which the optical fiber-reinforced contact wire is supported by the optical fiber-reinforced messenger wire via a hanger;
an optical fiber temperature distribution measurement device that is optically connected to the optical fiber detection line included in the optical fiber-containing messenger wire and the second optical fiber detection line included in the optical fiber-containing trolley wire, and measures temperature distribution in a longitudinal direction of the optical fiber detection line and the second optical fiber detection line;
A heavy and simple overhead line monitoring system equipped with When the temperature at any point of at least one of the optical fiber detection line and the second optical fiber detection line is 90° C. or higher, it is determined that the heavy simple overhead line is in a high temperature state.
A monitoring system for heavy simple overhead lines as claimed in claim 1. When the temperature at any point of both the optical fiber detection line and the second optical fiber detection line is equal to or lower than 0° C., it is determined that the heavy simple overhead line is in a low temperature state.
A heavy simple overhead line monitoring system according to claim 1. When the temperature at any point of both the optical fiber detection line and the second optical fiber detection line is 100° C. or higher for three or more consecutive minutes, it is determined that the heavy simple overhead line is in a localized heating state.
A monitoring system for heavy simple overhead lines as claimed in claim 1.

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