JP7447740B2 - Optical fiber-containing overhead wire and heavy simple overhead wire - Google Patents

Description

TECHNICAL FIELD The present invention relates to a monitoring system for an optical fiber-containing overhead line, a heavy simple overhead line, and a heavy simple overhead line.

In recent years, Shinkansen overhead contact lines have been transitioning from heavy compound overhead lines to heavy simple overhead lines, with the aim of making them maintenance-free and increasing speed. Heavy simple overhead wires do not use the auxiliary overhead wires used in heavy compound overhead wires, so the tension on the contact wires and the overhead wires is high, which places a heavy burden on their strength. Therefore, in order to ensure safety, it is desirable to constantly monitor the state of the contact wire using a contact wire in which an optical fiber is housed in a groove as a warning wire (for example, see Patent Document 1).

Patent No. 2738127

However, when the heavy compound overhead wire is changed to the heavy simple overhead wire, the strength burden increases not only on the contact wire but also on the bow overhead wire. The nominal cross-sectional area of the heavy simple overhead wire is 200 mm ² (cross-sectional area is 200 sq), which is larger than the nominal cross-sectional area of the heavy compound overhead wire of 150 mm ² , but the strength is still low due to the high tension of the overhead wire. There may be a shortage. Even in that case, it is not preferable to make the nominal cross-sectional area of the overhead wire larger than 200 mm ² for reasons such as an increase in mass and a decrease in workability. Therefore, in order to ensure the safety of the overhead wire, it is preferable to constantly monitor the condition of the overhead wire, similar to the contact wire.

Therefore, an object of the present invention is to provide a heavy simple overhead wire monitoring system that can constantly monitor the status of contact wires and overhead overhead wires, and a heavy simple overhead wire and optical fiber-containing overhead overhead wire that can be applied to the monitoring system. It's about doing.

In order to solve the above-mentioned problems, the present invention provides an optical fiber housing tube in which an optical fiber detection wire is housed inside a hollow tube, and a plurality of optical fiber detection wires twisted together so as to surround the optical fiber housing tube. To provide an optical fiber-containing overhead overhead wire, comprising: a overhead overhead wire body made of strands of wire;

Moreover, for the purpose of solving the above-mentioned problems, the present invention provides an optical fiber-containing contact wire that accommodates a second optical fiber detection line therein, and a contact wire that supports the optical fiber-containing contact wire via a hanger. To provide a heavy simple overhead line equipped with an optical fiber-containing overhead line.

Moreover, for the purpose of solving the above-mentioned problems, the present invention provides an optical fiber-containing contact wire that accommodates a second optical fiber detection line therein, and a contact wire that supports the optical fiber-containing contact wire via a hanger. a heavy simple overhead line comprising an optical fiber-containing overhead contact line, and optically connected to the optical fiber detection line included in the optical fiber-containing overhead contact line and a second optical fiber detection line included in the optical fiber-contained contact wire. and an optical fiber temperature distribution measuring device that measures temperature distribution in the longitudinal direction of the optical fiber detection line and the second optical fiber detection line.

According to the present invention, there is provided a monitoring system for heavy simple overhead wires that can constantly monitor the status of contact wires and overhead overhead wires, and heavy simple overhead wires and optical fiber-containing overhead overhead wires that can be applied to the monitoring system. Can be done.

FIG. 1 is a schematic diagram of a heavy simple overhead wire according to an embodiment of the present invention. FIG. 2A is a radial cross-sectional view of an example of an optical fiber-containing overhead wire according to an embodiment of the present invention. FIG. 2(b) is a radial cross-sectional view of an example of an optical fiber accommodation tube included in the optical fiber-containing overhead wire. FIG. 3 is a radial cross-sectional view of the optical fiber-containing contact wire according to the embodiment of the present invention. FIG. 4 is a schematic diagram showing the configuration of an overhead wire monitoring system according to an embodiment of the present invention.

[Embodiment]
FIG. 1 is a schematic diagram of a heavy simple overhead wire 1 according to an embodiment of the present invention. The heavy simple overhead wire 1 includes an optical fiber-containing contact wire 20 for supplying electric power to a railway vehicle, and an optical fiber-containing overhead contact wire 10 that suspends and supports the optical fiber-containing contact wire 20 by a hanger 30.

(Configuration of overhead cable with optical fiber)
FIG. 2A is a radial cross-sectional view of an example of the optical fiber-containing overhead wire 10 according to the embodiment of the present invention. FIG. 2(b) is a radial cross-sectional view of an example of the optical fiber accommodation tube 12 included in the optical fiber-containing overhead wire 10. As shown in FIG.

The optical fiber-containing overhead wire 10 is twisted to surround the optical fiber housing tube 12 and the optical fiber housing tube 12 in which the optical fiber detection wire 122 is housed in the inside (hollow part) 123 of the hollow tube 121. The overhead wire main body 11 is comprised of a plurality of wires 111.

The state of the optical fiber-containing overhead wire 10 can be constantly monitored by measuring the temperature of the optical fiber detection wire 122 included therein. Therefore, even if the nominal cross-sectional area of the butterfly overhead wire body 11 and the optical fiber accommodation tube 12 is 200 mm ² , which is the same as that of the butterfly overhead wire of the conventional heavy simple overhead wire, accidents caused by elongation or damage to the butterfly overhead wire can be easily prevented. Here, the nominal cross-sectional area of the overhead wire body 11 and the optical fiber housing tube 12 is calculated by multiplying the radial cross-sectional area of the strands 111 by the number of strands 111, and then adding the radial cross-sectional area of the hollow tube 121 to the radial cross-sectional area of the hollow tube 121. (calculated cross-sectional area). For example, when the calculated cross-sectional area is 192 to 209 mm ² , the nominal cross-sectional area is 200 mm ² .

The strands 111 constituting the overhead wire body 11 are usually concentrically twisted in multiple layers, as shown in the example of FIG. 2(a). In this case, the butterfly overhead wire 10 has a multilayer structure consisting of one optical fiber housing tube 12 at the center and a plurality of wires 111 concentrically twisted around the optical fiber housing tube 12. has. The direction in which the wires 111 are twisted may be either right-handed or left-handed. Moreover, it is preferable that the overhead wire main body 11 is constructed by twisting in different directions, in which layers of right-handed twist and layers of left-handed twist are alternately arranged in multiple stages.

The wire 111 constituting the overhead wire main body 11 is made of copper or a copper alloy, for example, and has properties such as tensile strength (wire strength) that satisfies the standard of "JIS C 3101 Hard Copper Wire for Electrical Use." For example, when the diameter is 2.6 mm, the tensile strength is 434 MPa or more, when the diameter is 2.7 mm, the tensile strength is 433 MPa or more, when the diameter is 2.8 mm, the tensile strength is 432 MPa or more, and when the diameter is 3 When the diameter is .2 mm, the tensile strength is 427 MPa or more, when the diameter is 3.5 mm, the tensile strength is 424 MPa or more, and when the diameter is 3.7 mm, the tensile strength is 422 MPa or more.

In addition, the number of strands 111 constituting the overhead wire body 11 is determined in the radial direction of the strands 111 and the hollow tube 121 so that the nominal cross-sectional area of the overhead wire body 11 and the optical fiber accommodation tube 12 is 200 ^mm2 . Set according to the cross-sectional area. For example, if the diameter of the wire 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, As shown in the example a), by using 18 strands 111 (the total number of strands 111 and hollow tubes 121 is 19), the connection between the overhead wire body 11 and the optical fiber accommodation tube 12 is reduced. The nominal cross-sectional area will be 200 ^mm2 .

Further, for example, when the diameter of the strands 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, 36 strands 111 are used. 111 and hollow tubes 121 is 37), the nominal cross-sectional area of the overhead wire main body 11 and the optical fiber accommodation tube 12 becomes 200 mm ² .

The wire 111 is formed by drawing a roughly drawn wire of a predetermined diameter by drawing, so the smaller the diameter, the higher 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 about 3% or more. Therefore, compared to using 18 strands 111 with a diameter of 3.2 to 3.7 mm (tensile strength of 422 MPa or more), wires with a diameter of 2.6 to 2.8 mm (tensile strength of 432 MPa or more) When 36 strands 111 are used, the tensile load of the overhead wire body 11 (the maximum load that the sample can withstand in the tensile test) is larger.

Table 1 below shows examples (Examples 1 to 3) of the configuration and characteristics of the optical fiber-containing overhead wire 10. The configuration and characteristics of the optical fiber-containing overhead wire 10 shown in Table 1 all meet the standard of "JIS C 3105 hard copper stranded wire". The "wire diameter" in Table 1 is the diameter of the wire 111 and the optical fiber housing tube 12, and the "number of wires" is the number of wires 111 plus 1, which is the number of optical fiber housing tubes 12. "Tensile load," "outer diameter," "electrical resistance," and "mass" are the tensile load, outer diameter, electrical resistance, and mass of the optical fiber-containing overhead wire 10, respectively.

The hollow tube 121 of the fiber accommodation tube 12 is made of copper or a copper alloy, for example. Moreover, as the optical fiber detection line 122 accommodated in the interior 123 of the hollow tube 121, for example, a normal single mode optical fiber can be used. 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 lines 122 in the optical fiber accommodation 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 accommodation 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 inside 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 location where the optical fiber housing tube 12 is locally bent is suppressed, and the transmission loss of the optical fiber detection line 122 is reduced. can be suppressed.

Further, by setting the filling rate of the optical fiber detection wire 122 to 50% or more, it is possible to suppress the optical fiber detection wire 122 from moving inside the hollow tube 121 due to train vibration. Note that if the filling rate of the optical fiber detection wire 122 is less than 50%, filling the inside 123 of the hollow tube 121 with a filler such as jelly will prevent the inside 123 of the hollow tube 121 from being exposed to light due to train vibration. Movement of the fiber detection line 122 can be suppressed.

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

The outer diameter of the hollow tube 121 is preferably equal to the diameter of the strand 111 in order to make the hollow tube 121 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. "Outer diameter", "inner diameter", and "thickness" in Table 2 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 wire 122, and " ``Filling rate'' is the filling rate of the optical fiber detection wire 122, ``Jerry'' is the presence or absence of jelly as a filler filled in the inside 123 of the hollow tube 121, and ``transmission loss'' is the filling rate of the optical fiber detection wire 122. This is the transmission loss of the optical fiber detection line 122 when it is 18 copper wires of 3.7 mm.

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

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

The contact wire main body 21 is, for example, an irregular round contact wire that corresponds to the grooved hard copper contact wire specified in JRS (Japanese National Railway Standards), JISE2101, and EN50149, and has a small arc surface 211 on the upper part and a small arc surface 211 on the lower part. It has a large arc surface 212 and a V-shaped ear groove 213 between the small arc surfaces 211 and the large arc surfaces 212 on both sides. The main component of the contact wire main body 21 is a copper alloy, for example, a Cu-Sn-In alloy or a Cu-Sn alloy. The nominal cross-sectional area of the contact wire main body 21 is, for example, 150 mm ² or 170 mm ² .

The hole 214 is preferably provided below the vertical midpoint of the contact wire main body 21 (on the large arc surface 212 side). This is to make it easier to detect the temperature change at the bottom of the trolley wire main body 21 that comes into contact with the pantograph, and to make it easier to predict the adhesion of ice or frost on the bottom of the trolley wire main 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 detection wires 22 accommodated in the two holes 214 are optically connected at the end of the optical fiber-containing contact wire 20 opposite to the optical fiber temperature distribution measuring device 40, and are one optically continuous wire. The optical fiber is folded back and passes through the optical fiber-containing contact wire 20 in a reciprocating manner.

Even if the optical fiber detection line 22 has only one hole 214, that is, the optical fiber detection line 22 penetrates the optical fiber-containing contact wire 20 in only one direction, the temperature of the optical fiber detection line 22 can be measured. Although it is possible to monitor the state of the optical fiber-containing contact wire 20 by using the contact wire 20, the configuration in which the contact wire 20 penetrates the optical fiber back and forth has the following advantages. First, since two temperature measurements are obtained at each position on the optical fiber-containing contact wire 20, the accuracy of temperature measurement can be improved. In addition, even if a part of the optical fiber detection wire 22 is broken due to wear of the contact wire main body 21, temperature measurement can be continued, so the temperature can be measured until the optical fiber detection wire 22 is repaired or replaced. There will never be a time when you cannot do it.

(Configuration of overhead wire monitoring system)
FIG. 4 is a schematic diagram showing the configuration of an overhead wire monitoring system 100 according to an embodiment of the present invention. The overhead line monitoring system 100 is a system for monitoring the status of the optical fiber-containing overhead contact line 10 and the optical fiber-containing contact wire 20 of the heavy simple overhead line 1, and includes the optical fiber-containing overhead contact line 10 and the optical fiber-containing contact line 10 that house an optical fiber detection line 122 inside. , an optical fiber-containing contact wire 20 that accommodates the optical fiber detection line 22 therein, and a contact wire 20 that is optically connected to the optical fiber detection line 122 and the optical fiber detection line 22, and that is optically connected to the optical fiber detection line 122 and the optical fiber detection line 22; and an optical fiber temperature distribution measurement device that measures temperature distribution in a direction. In addition, in FIG. 4, illustration of the structure other than the optical fiber detection line 122 and the optical fiber detection line 22 of the heavy simple overhead wire 1 is omitted.

In the overhead line monitoring system 100, the optical fiber detection line 122 included in the optical fiber-containing overhead overhead line 10 is optically connected to the optical fiber temperature distribution measuring device 40 via the optical penetration insulator 52 and the optical switch 51 at its end. Connected. Further, the optical fiber detection line 22 included in the optical fiber-containing contact wire 20 is optically connected to the optical fiber temperature distribution measuring device 40 via the optical penetration insulator 53 and the optical switch 51 at its end.

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

In general, contact wires and pantographs are damaged by frost buildup on contact wires during low-temperature periods, and the temperature of contact wires and overhead wires increases during high-temperature periods or when timetables are disrupted, causing elongation and tension adjustment. Problems may arise, such as the tension in contact wires and overhead wires decreasing to an extent that cannot be fully adjusted by the device, causing problems in train operation. By measuring the temperature of the contact wire and the overhead wire using the overhead wire monitoring system 100, it is possible to detect and respond to signs such as frost buildup on the contact wire or a decrease in the tension of the contact wire or the overhead wire. .

In addition, since 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 is not affected by electricity during feeding hours such as when trains are running. It can be implemented even if Therefore, the states of the optical fiber-containing overhead wire 10 and the optical fiber-containing contact 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 backscattered light generated within the optical fiber detection lines 122, 22. Measure. By switching the connection destination 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, one optical fiber temperature distribution measurement device 40 can connect the optical fiber detection line 122 and the optical fiber detection line 22. Both temperature distributions of the optical fiber sensing line 22 can be measured. A specific example of the configuration and operation of the optical fiber temperature distribution measuring device 40 will be described later.

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

The optical penetration insulator 52 pulls the optical fiber detection line 122 down to the ground in a state where it is electrically disconnected from the overhead wire body 11 of the optical fiber-containing overhead wire 10, the hollow tube 121, etc., and connects it to the ground from the optical switch 51. This is a device for connecting to the extending optical fiber 55. In addition, the optical penetration insulator 53 pulls down the optical fiber detection wire 22 from the contact wire main body 21 of the overhead optical fiber-containing contact wire 20 to the ground in a state where it is electrically disconnected, and connects the optical fiber extending from the optical switch 51 to the ground. This is a device for connecting to 56.

As shown in FIG. 3, when two holes 214 are included in the contact wire main body 21 and the optical fiber detection wire 22 passes through the optical fiber-containing contact wire 20 in a reciprocating manner, as shown in FIG. It is preferable that both ends of the optical fiber detection line 22 on the forward and return sides are optically connected to the optical switch 51. With this, when a part of the optical fiber detection line 22 is broken, the pulsed light emitted from the optical fiber temperature distribution measuring device 40 is allowed to enter from the outbound side and the return side of the optical fiber detection line 22 that are not broken. By switching the optical switch 51 in this manner, it is possible to continue measuring the temperature of the entire optical fiber-containing contact wire 20.

The overhead line monitoring system 100 can also measure the temperature of a plurality of different heavy simple overhead lines 1, for example, a plurality of heavy simple overhead lines 1 used for different lines. In this case, the optical fiber detection lines 122 and 22 included in each heavy simple overhead line 1 are optically connected to the optical switch 51, respectively. By switching the plurality of optical fiber detection lines 122 and 22 connected to the optical fiber temperature distribution measuring device 40 using the optical switch 51, the heavy simple overhead line 1 to be subjected to temperature measurement can be switched.

Further, FIG. 4 shows a block diagram of an example of the basic configuration and operation of the optical fiber temperature distribution measuring device 40. In the optical fiber temperature distribution measuring device 40, a light source 41 is connected to the input end of the optical demultiplexer 42, an optical fiber 54 is connected to the input and output ends of the optical demultiplexer 42, and one of the optical demultiplexers 42 A photoelectric converter (hereinafter referred to as an O/E converter) 43a is connected to the output end, and an O/E converter 43b is connected to the other output end of the optical demultiplexer 42.

An arithmetic control section 46 is connected to the output terminal of the O/E converter 43a via an amplifier 44a and an A/D converter 45a, and an amplifier 44b and an A/D converter are connected to the output terminal of the O/E converter 43b. An arithmetic control section 46 is connected via 45b. Further, the calculation control section 46 is connected to the light source 41 via a pulse generation section 47.

As the light source 41, for example, a laser diode is used, and it emits pulsed light corresponding to a timing signal from the calculation control section 46 inputted via the pulse generation section 47. The optical demultiplexer 42 takes in the pulsed light emitted from the light source 41 from its input end, and transmits the pulsed light from its input/output end to the optical fiber detection lines 122 and 22 via the optical switch 51 and the optical insulators 52 and 53. is emitted. Further, the optical demultiplexer 42 takes in the backward Raman scattered light of the pulsed light propagating within the optical fiber detection lines 122 and 22 from its input and output ends, and wavelength-separates it into Stokes light and anti-Stokes light.

For example, photodiodes are used as the O/E converters 43a and 43b, and the Stokes light emitted from one output end of the optical demultiplexer 42 enters the O/E converter 43a, and the O/E The anti-Stokes light emitted from the other output end of the optical demultiplexer 42 enters the converter 43b, and outputs electrical signals corresponding to the respective incident lights.

Amplifier 44a and amplifier 44b amplify the electrical signals output from O/E converter 43a and O/E converter 43b, respectively. A/D converter 45a and A/D converter 45b convert the signals output from amplifier 44a and amplifier 44b, respectively, into digital signals.

The calculation control unit 46 calculates the temperature from the intensity ratio of the two components of the backscattered light, that is, the Stokes light and the anti-Stokes light, based on the digital signals output from the A/D converters 45a and 45b, and calculates the temperature in time series. Based on this, the temperature distribution along the length direction of the optical fiber detection lines 122, 22 is displayed on a display means (not shown). Note that the relationship between the intensity ratio and temperature is stored in advance in the arithmetic control unit 46 in the form of a table or an equation. 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 position is stored in the calculation and control unit in the form of a table or formula. 46 may be stored. Further, the calculation control unit 46 sends a timing signal to the light source 41 to control the timing of the light pulses emitted from the light source 41.

Next, the principle of temperature distribution measurement will be explained. Expressing the signal intensity of Stokes light and anti-Stokes light as a function of time with reference to the light emission timing in light source 41, since the speed of light in optical fiber detection lines 122 and 22 is known, It can be replaced by a function of the distance along the sensing lines 122, 22. That is, the relationship between the positions of the optical fiber detection lines 122 and 22 and the intensity of the generated Stokes light and anti-Stokes light can be obtained. On the other hand, 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 and 22, and furthermore, the intensity ratio I ₁ /I ₂ of both lights also depends on the temperature of the optical fiber detection lines 122 and 22. depends on the temperature. Therefore, the temperature distribution of the optical fiber detection lines 122, 22 can be known from the relationship between the positions of the optical fiber detection lines 122, 22 and the intensity ratio I ₁ /I ₂ .

(Example of operation of overhead wire monitoring system)
An example of the operation of the overhead line monitoring system 100 will be described below. In the first example, while the overhead wire monitoring system 100 continues to monitor the temperature distribution of the optical fiber detection wire 122 accommodated in the optical fiber-containing overhead contact wire 10 and the optical fiber detection wire 22 accommodated in the optical fiber-containing contact wire 20, When the temperature at any point of at least one of the optical fiber detection line 122 and the optical fiber detection line 22 becomes 90°C or higher (hereinafter referred to as the first condition), the heavy simple overhead line 1 becomes in a high temperature state. It is determined that there is.

The above first condition is typically satisfied when the temperature is high and the trains are overcrowded, so that the heavy simple overhead wire 1 is at a high temperature. Therefore, when the overhead line monitoring system 100 determines that the heavy simple overhead line 1 is in a high temperature state due to the first condition being met, based on that determination, measures such as thinning out trains are taken. It can be implemented.

In the second example, while the overhead wire monitoring system 100 continues to monitor the temperature distribution of the optical fiber detection wire 122 accommodated in the optical fiber-containing overhead contact wire 10 and the optical fiber detection wire 22 accommodated in the optical fiber-containing contact wire 20, If the temperature at any point of both the optical fiber detection line 122 and the optical fiber detection line 22 is 0°C or lower (hereinafter referred to as the second condition), the heavy simple overhead line 1 is in a low temperature state. It is determined that

The above second condition is typically satisfied when frost builds up on the optical fiber-containing overhead wire 10 or the optical fiber-containing contact wire 20 under conditions such as low temperature, high humidity, and low wind speed. However, for this reason, the heavy simple overhead line 1 is in a low temperature state. Therefore, if the second condition is met and the overhead line monitoring system 100 determines that the heavy simple overhead line 1 is in a low temperature state, based on that determination, measures such as operating a defrosting truck are implemented. can do.

In the third example, while the overhead wire monitoring system 100 continues to monitor the temperature distribution of the optical fiber detection wire 122 accommodated in the optical fiber-containing overhead contact wire 10 and the optical fiber detection wire 22 accommodated in the optical fiber-containing contact wire 20, If the temperature at any point of both the optical fiber detection line 122 and the optical fiber detection line 22 is 100°C or higher for 3 consecutive minutes or more (hereinafter referred to as the third condition), the heavy simple overhead line 1 is determined to be in a local heating state.

The above third condition is satisfied, for example, when the train stops at the air section due to a breakdown, and the two overhead wires are short-circuited at the pantograph, resulting in heavy simple overhead wire 1 being locally heated. . Therefore, if the third condition is satisfied and the overhead line monitoring system 100 determines that the heavy simple overhead line 1 is in a locally heated state, the power to the heavy simple overhead line 1 is cut off based on that determination. Measures such as

Specifically, the determination of the state of the heavy simple overhead line 1 by the overhead line monitoring system 100 when the above first to third conditions are satisfied includes, for example, the status of the overhead line connected to the optical fiber temperature distribution measuring device 40. The determination device 60 performs this determination based on data on the temperature distribution of the optical fiber detection lines 122 and 22 acquired by the optical fiber temperature distribution measuring device 40. For example, a PC (Personal Computer) can be used as the overhead line state determination device 60. For example, as shown in FIG. 4, the optical fiber detection line 122, 22 temperature distribution data is received and the determination is made. Further, the result of this determination is displayed on a display means such as a monitor included in the overhead wire state determining device 60, for example.

(Effects of embodiment)
According to the embodiment described above, by measuring the temperature of the optical fiber detection wires 122 and 22 included in the optical fiber-containing overhead wire 10 and the optical fiber-containing trolley wire 20, The state of line 20 can be constantly monitored. This makes it possible to accurately detect signs of frost buildup on contact wires and decreases in tension on contact wires and overhead wires, making it possible to detect problems with overhead wires more accurately than by monitoring only the condition of contact wires. can be avoided. Therefore, the optical fiber-containing overhead wire, the heavy simple overhead wire, and the heavy simple overhead wire monitoring system according to the embodiments of the present invention can be suitably used for, for example, the heavy simple overhead wire of the Shinkansen.

(Summary of embodiments)
Next, technical ideas understood from the embodiments described above will be described using reference numerals and the like in the embodiments. However, each reference numeral in the following description does not limit the constituent elements in the claims to those specifically shown in the embodiments.

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

[2] The overhead wire body (11) consists of 18 strands (111), and the strands (111) are copper wires or copper alloy wires having a diameter of 3.2 to 3.7 mm, and are hollow. [1] above, wherein the tube (121) is 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 accommodation tube (12) and the overhead wire body (11) is 200 ^mm2 . The optical fiber-containing overhead wire (10) described in .

[3] The overhead wire main body (11) is composed of 36 strands (111), and the strands (111) have a diameter of 2.6 to 2.8 mm and a tensile strength of 432 MPa or more, and are optical fibers. The optical fiber-containing overhead wire (10) according to [1] above, wherein the storage tube (12) and the overhead overhead wire body (11) have a nominal cross-sectional area of 200 mm ² .

[4] The optical fiber according to any one of [1] to [3] above, wherein the filling rate of the optical fiber detection line (122) in the optical fiber accommodation tube (12) is 50% or more and 70% or less. Incoming overhead wire (10).

[5] [1] above, wherein the filling factor of the optical fiber detection line (122) in the optical fiber accommodation tube (12) is less than 50, and the inside (123) of the hollow tube (121) is filled with a filler. The optical fiber-containing overhead wire (10) according to any one of [3] to [3].

[6] The optical fiber-containing contact wire (20) that accommodates the second optical fiber detection line (22) therein, and the optical fiber-containing contact wire (20) supported via a hanger (30), [1] A heavy simple overhead wire (1) comprising the optical fiber-containing overhead wire (10) according to any one of [5].

[7] The optical fiber-containing contact wire (20) that accommodates the second optical fiber detection line (22) therein, and the optical fiber-containing contact wire (20) supported via a hanger (30), [1] A heavy simple overhead wire (1) comprising the optical fiber-containing overhead wire (10) according to any one of [5], and an optical fiber detection wire (122) included in the optical fiber-containing overhead wire (10). ) and the second optical fiber detection line (22) included in the optical fiber-containing contact wire (20), and the longitudinal length of the optical fiber detection line (122) and the second optical fiber detection line (22) A heavy simple overhead line monitoring system (100), comprising an optical fiber temperature distribution measuring device (40) that measures directional temperature distribution.

[8] 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) reaches 90°C or more, the heavy simple overhead wire (1) becomes in a high temperature state. The heavy simple overhead line monitoring system (100) according to [7] above, which determines that there is a heavy simple overhead line.

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

[10] If 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 3 consecutive minutes or more, the heavy simple overhead line (1 ) is in a state of local heating, the heavy simple overhead line monitoring system (100) according to any one of [7] to [9] above.

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

Furthermore, the embodiments described above do not limit the claimed invention. Furthermore, it should be noted that not all combinations of features described in the embodiments are essential for solving the problems of the invention.

1 Heavy simple overhead wire 10 Overhead overhead wire with optical fiber 11 Overhead overhead wire body 111 Element wire 12 Optical fiber accommodation tube 121 Hollow tube 122 Optical fiber detection wire 123 Inside 20 Contact wire with optical fiber 21 Contact wire body 22 Optical fiber detection wire 30 Hanger 40 Optical fiber temperature distribution measuring device 60 Overhead line status determination device 100 Overhead line monitoring system

Claims (4)

an optical fiber housing tube in which an optical fiber detection line is housed inside the hollow tube;
comprising a overhead wire body consisting of a plurality of wires twisted together so as to surround the optical fiber accommodation tube;
The overhead wire body consists of 18 of the strands,
The wire is a copper wire or copper alloy wire having a diameter of 3.2 to 3.7 mm,
The hollow tube is a copper tube or copper alloy tube having a thickness of 1.0 mm or more,
The nominal cross-sectional area of the optical fiber accommodation tube and the overhead wire body is 200 mm ²
is,
Overhead line with optical fiber. The filling rate of the optical fiber detection wire in the optical fiber accommodation tube is 50% or more and 70% or less,
The optical fiber-containing overhead wire according to claim 1. The filling rate of the optical fiber detection wire in the optical fiber accommodation tube is less than 50%,
The inside of the hollow tube is filled with a filler,
The optical fiber-containing overhead wire according to claim 1. an optical fiber-containing contact wire that accommodates a second optical fiber detection line therein;
The optical fiber-containing overhead wire according to claim 1, which supports the optical fiber-containing contact wire via a hanger;
A heavy simple overhead line with

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