KR20150104978A - rigid bar monitering system - Google Patents

Abstract

Disclosed is a rigid bar monitoring system. The rigid bar monitoring system according to the present invention accurately and quickly grasps a temperature rise or the sagging of a rigid bar, prevents damage to the rigid bar beforehand by preventing an arc and an abrasion of the rigid bar, and improves the reliability of the rigid bar by accurately sensing the temperature change and the deformation of the rigid bar without being affected by a magnetic field generated in the rigid bar. Also, installation and maintenance costs can be reduced by sensing the temperature change and the deformation of the rigid bar by simply changing a structure of the system.

Description

A rigid bar monitoring system

The present invention relates to a rigid body line monitoring system, and more particularly, it relates to a rigid body line monitoring system capable of easily detecting a point where a deflection of a rigid body line occurs or a point where a temperature rises, thereby preventing arc generation and abrasion of the line, The present invention relates to a rigid body cable monitoring system.

In general, electric railway is used by many people because of its advantages of quick, accurate and stable compared with other transportation methods. Moreover, recently, high-speed railway is widely used, and it is attracting attention as a safe and convenient public transportation means.

Electric railway, which has been attracting attention as a new transportation means in the 21st century along with the opening of high-speed railway, has recently been required to improve the performance, reliability and safety of electric railway lines due to speeding up of electric railway,

Here, a catenary line can be defined as a line including a catenary line for supplying electric power in contact with a current collecting device of a train that runs the line, and the facilities attached thereto.

Electric power required for driving the electric vehicle is supplied to the electric cable and electric current collectors of the pantograph of the vehicle. The electric cable that supplies electric power to the electric motor is classified according to the electric power feeding method.

Specifically, the catenary line can be classified into an overhead catenary system and a third rail system, and the machined catenary line is divided into a rigid constriction system and a suspension system.

In this case, the suspension system is applied to the ground section in a manner that the line is guided by using a wire line. Since the line, the wire and the dropper line must be connected together and a peripheral device such as a tension control device is required, , It is difficult to apply it to the tunnel section because of its complexity.

That is, in order to apply the suspension bridge system to the tunnel section, the tunnel cross-sectional area must be increased so much that the construction cost is excessively increased. Also, since the installation space is narrow, daily inspection and maintenance are not easy.

The third railway type is advantageous in that it can be installed on a narrow space such as a tunnel by installing a power supply rail on the road surface or a side surface to supply electric power. However, since the power supply rail is disposed on the ground, It is dangerous and only applies to some special sections.

On the other hand, the above-mentioned rigid-body hitching system is constructed by integrating a catenary cable into a rigid body and installing it by using a separate structure such as a bracket. Thus, no tightening is required and a separate tension maintaining device is not necessary. .

In fact, the height of a rigid body line is about 90 to 120mm including a rigid body and a catenary line, and the total height of the contact between the collecting contact of the catenary line and the tunnel upper ceiling considering the support and electrical separation at low voltage (DC 750V or 1500V) Do.

Therefore, since the installation space of the rigid catenary line is small, it is possible to greatly reduce the construction cost in the new tunnel, and it is also advantageous in the maintenance work in the tunnel.

The rigid catenary is called the R-Bar by reducing the rigid bar. The rigid catenary with a cross-sectional shape similar to that of the T-bar is called a T-Bar. Although the R-Bar is superior to the T-Bar in terms of workability and current collecting performance, it is widely used. In Korea, T-bar is applied to the DC section and R-bar is applied to the AC section.

Since the rigid electric wire must serve as a conductor capable of supplying electric power to the electric vehicle, it is mainly applied to a light aluminum alloy material, and expansion and contraction occur due to changes in ambient temperature. .

On the other hand, if a bolt loosening occurs at the middle of the rigid body line or a deflection occurs at the welded portion, the damage of the line can be concentrated as the railroad vehicle passes over it. If the resistance increases due to oxidation at a specific portion, The abrasion amount of the abrasive grains can be increased. Particularly, the arc can be generated due to the contact with the pantograph of the railway vehicle, and the temperature may rise. In the point where the arc is generated, the arc is continuously generated, so that the damage of the electric wire can be concentrated.

In order to prevent the damage of the catenary cable, it is necessary to continuously monitor the point where such deflection occurs or the temperature rises. However, since the rigid catenary cable is generally installed over a long section, In case of using the sensor, interference may occur due to the magnetic field generated by the current flowing through the rigid body line, and accurate sensing may not be performed.

Therefore, there is a need for a rigid body line monitoring system capable of easily preventing damage to an electric line by preventing arc generation and abrasion of an electric line by easily grasping a point where deflection of a rigid body line occurs or a point where temperature rises .

Embodiments of the present invention are intended to precisely and quickly grasp deflection or temperature rise of a rigid electric wire.

In addition, arc generation and abrasion of the catenary are prevented to prevent damage to the catenary.

Also, it is intended to accurately detect the deformation and temperature change of a rigid body line without affecting the magnetic field generated by the rigid body line, thereby improving the reliability of the line.

Also, it is intended to provide a rigid body line monitoring system which can reduce the installation and maintenance costs by detecting the deformation and temperature change of the rigid body line by a simple structure change.

According to an aspect of the present invention, there is provided a method of fixing a rigid electric cable, comprising: a rigid body line, a support clamp for supporting the rigid line in a fixed or slidable manner, a support fixed or rotatably supported on a wall surface of the tunnel, An optical fiber sensor provided along the rigid electric wire so as to detect a deformation or a temperature change of the rigid electric wire, and a fixing unit fixing the optical fiber sensor on the rigid electric cable, .

The fixing unit may include a fixing clip for fixing the optical fiber sensor at regular intervals along the rigid body line.

The fixing clip may be made of an elastic material.

The fixing clip may be made of tin-plated metal or stainless steel.

The fixing part may include a mounting groove continuously formed along the rigid body line to fix the optical fiber sensor.

The optical fiber sensor may be a DTS (Distributed Temperature Sensor) using Raman scattering light.

The optical fiber sensor can detect a deformation or temperature change of a rigid electric wire using Brillouin scattering light.

Embodiments of the present invention can accurately and quickly grasp the deflection and temperature rise of a rigid electric wire.

In addition, arc generation and abrasion of the catenary line can be prevented, so that damage to the catenary line can be prevented in advance.

In addition, it is possible to accurately detect the deformation of the rigid body line and the temperature change without affecting the magnetic field generated from the rigid body line, thereby improving the reliability of the line.

Also, it is possible to provide a rigid body line monitoring system which can reduce the installation and maintenance costs by detecting the deformation and the temperature change of the rigid body line by a simple structure change.

1 is a sectional view of a rigid electric wire according to an embodiment of the present invention;
2 is a perspective view of a telescopic joint device according to an embodiment of the present invention.
3 is an exploded perspective view and a perspective view of a support clamp according to an embodiment of the present invention.
Figure 4 is a top view of a support bracket according to an embodiment of the present invention.
5 is a front view showing a state in which a rigid electric wire is connected to a railway vehicle according to an embodiment of the present invention.
6 is a perspective view of a fastening clip according to an embodiment of the present invention.
7 is a cross-sectional view illustrating a state in which the optical fiber sensor is fixed by applying a fixing clip according to an embodiment of the present invention.
FIG. 8 is a perspective view of the state where the optical fiber sensor is fixed by applying the fixing clip according to the embodiment of the present invention,
FIG. 9 is a perspective view illustrating a state in which the optical fiber sensor is fixed by applying a fixing clip according to an embodiment of the present invention,
10 is a cross-sectional view showing a state where the optical fiber sensor is fixed to the mounting groove according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

2 is a perspective view of a telescopic joint apparatus according to an embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a disassembly of a support clamp according to an embodiment of the present invention. It is a perspective and a perspective. 4 is a plan view of a support bracket according to an embodiment of the present invention, FIG. 5 is a front view showing a state that a rigid electric wire is connected to a railway vehicle according to an embodiment of the present invention, FIG. 6 is a cross- Fig. FIG. 7 is a cross-sectional view illustrating a state where an optical fiber sensor is fixed by applying a fixing clip according to an embodiment of the present invention. FIG. 8 is a view illustrating a state in which an optical fiber sensor is fixed by applying a fixing clip according to an embodiment of the present invention FIG. 9 is a perspective view illustrating a state in which the optical fiber sensor is fixed by applying a fixing clip according to an embodiment of the present invention. FIG.

1 to 9, a rigid body line monitoring system according to an embodiment of the present invention includes a rigid catenary 50, a support clamp 200 for supporting the rigid catenary 50 in a fixed or slidable manner, A support bracket 300 fixedly or rotatably connected to a wall of a tunnel or a support provided on the ground to fix and support the support clamp 200 and a support bracket 300 for supporting the rigid- An optical fiber sensor 70 provided along the rigid electric cable 50 to detect the optical fiber sensor 70 and a fixing unit for fixing the optical fiber sensor 70 on the rigid electric cable 50.

The rigid catenary 50 includes a catenary 54 for supplying current through electrical contact with the pantograph 2 provided on the upper portion of the electric motor 1 and a rigid body 52 coupled with the catenary 54. The current conveyed by the rigid catenary line 50 is supplied through the pantograph 2 installed on the upper portion of the electric motor 1 for the purpose of running the electric motor vehicle, and the rail 60 is used as a return line.

The above-mentioned R-bar and T-bar may be applied to the rigid body line 50, and R-bar is taken as an example in the present embodiment.

Generally, the rigid catenary line 50 R-BAR is connected in a unit of 400 m, and the supporting bracket 300 provided for every 10 m and the support clamp 200 are arranged so that the pantograph 2 of the railway car 1 touches Lt; / RTI > At this time, the rigid body 52 has protrusions 52a on both sides of the upper portion, and the protrusions 52a are supported by the support clamps 200.

A flow preventing device (not shown) is installed at a central point of the rigid catenary line 50 to prevent the rigid catenary line 50 from being pushed as the train 1 passes, The expansion joint device 100 is installed to absorb a change in length due to deformation of the rigid electric cable 50 during expansion and contraction and maintain electrical contact with the pantograph 2.

The structure of the expansion joint device 100 will be described in more detail. The connection block 110 is fixed to each end of the rigid catenary cable 50. Two connection blocks 110 may be provided on both sides of the ends of the rigid electric cable 50 in the width direction. Further, two end portions of the adjacent rigid electric wire 50 may be provided on both sides in the width direction so as to correspond to the ends.

The connection block 110 is fixedly coupled to the rigid electric cable 50 by welding or bolting. At this time, the connection block 110 contacts the rigid electric cable 50 to maintain the electrical connection.

At least one connection bar 120 is inserted into the connection block 110. One end of the connection bar 120 is inserted into the connection block 110 at one side and the other end is inserted into the connection block 110 at the other side adjacent to the connection block 110.

One end and the other end of the connecting bar 120 are inserted into and connected to the adjacent connecting block 110 so that neighboring connecting blocks 110 are electrically connected to each other. 50 can be electrically connected.

Three connection bars 120 may be provided to connect the neighboring connection blocks 110. Three connection bars 120 connecting the connection blocks 110 fixed to the other side in the width direction of the rigid- And the bar 120 may be combined to electrically connect the rigid electric wire 50 separated from the six connection bars 120 to each other. However, the present invention is not limited thereto, and the number of the connection bars 120 may be varied as needed.

The connection bar 120 may be made of a metallic material having good electrical conductivity. For example, a copper bar made of copper may be used as the connection bar 120.

The connection block 110 is movably provided along the connection bar 120 inserted through the connection block 120. Therefore, when the rigid catenary 50 is extended and contracted, the connection block 110 fixed to the rigid catenary 50 moves along the connection bar 120, The electrical connection between the rigid electric wires 50 at any position of the connection bar 120 can be maintained.

A center stopper 122 may be provided at the center of the connecting bar 120 to prevent the neighboring connecting blocks 110 from colliding with each other when the rigid catenary 50 is extended.

The center stopper 122 is fixed to the center of the connecting bar 120 in a state of being penetrated by the connecting bar 120 and the center stopper 122 also functions as a marker for indicating the center of the connecting bar 120 .

Therefore, when the adjacent rigid bodies 50 have the same amount of expansion and contraction, the connecting blocks 110 on both sides of the connecting bar 120 are positioned at symmetrical distances with respect to the center stopper 122.

A plurality of connection bars 120 are maintained at an equal potential at the ends of the connection bars 120 and the connection blocks 110 are prevented from separating from the connection bars 120 when the rigid- An end stopper 124 may be provided.

The end stopper 124 is bolted to the connecting bar 120 in a state in which a bolt tap (not shown) formed on the end of the connecting bar 120 is aligned with a bolt hole (not shown) formed on the end stopper 124, 120, respectively.

A brass contact blade 154 is interposed between the rigid electric transmission lines 50 to maintain mechanical continuity in place of the intermittent metro line 52. In the portion where the rigid metro line 50 is disconnected, 154 are brought into contact with the pantograph 2 of the electric vehicle 1 in place of the electric wire 52.

Two of the contact blades 154 are inserted and fixed in the one side rigid cable 50 and the other two are inserted and fixed in the other side rigid cable and the contact blades 154 inserted in the other side are alternately overlapped.

In the expansion joint device 100 constructed as described above, when the rigid electric cable 50 is contracted, the neighboring rigid electric wires 50 are distant from each other, and the connection block 110 fixed to the rigid electric cable 50, The connection block 110 moves along the connection bar 120 in a direction in which the adjacent connection blocks 110 move away from each other.

On the contrary, when the rigid electric cable 50 is extended, the neighboring rigid electric wires 50 are brought close to each other, and the adjacent connection blocks 110 move in the direction of approaching each other along the connection bar 120 .

Even if the rigid electric cable 50 repeats elongation and contraction in this way, the separated rigid electric wires 50 continue to be electrically and mechanically connected by the connection block 110 and the connecting bar 120 constituting the expansion joint device .

3, the support clamp 200 includes a body 210, a main shaft 220 connected to the body 210 at one side, and a main shaft 220 connected to the support bracket at the other side, And a support portion 230 detachably coupled to both sides of the rigid catenary 210 to slidably support the rigid catenary 50.

The body 210 may be made of the same aluminum material as the material of the rigid catenary 50 and may have a plate shape having a predetermined width. The main shaft 220 may be fixedly coupled to a central portion of the body 210. A supporting plate 240 is provided on one side of the main shaft 220 and the supporting clamp 200 is fixed to the supporting bracket 300 through a bolt 242 and a nut 244, As shown in Fig.

The support part 230 supports the rigid electric wire 50 in a slidable manner. However, if necessary, the support part 230 can selectively support the rigid electric wire 50 in a fixed state. It is also possible to apply them alternatively. Here, the support part 230 may be made of an aluminum material similar to the body 210.

3, two support portions 230 may be coupled to both sides of the body 210, and the support portions 230 may be bolted by a plurality of fixing bolts 212 and washers 214. Referring to FIG. Of course, the support part 230 may be detached from the body 210 by disassembling the fixing bolt 212.

The supporting portion 230 includes a groove portion 232. The sliding portion 234 may be formed in the groove portion 232. The sliding portion 234 may be made of a plastic material that is in contact with the protrusion 52a of the rigid- .

The sliding portion 234 functions to smoothly move the rigid catenary 50 when the rigid catenary 50 undergoes a temperature change or a shrinkage or extension. When the rigid meticulous line 234 contacts the rigid metric 50, And may be made of a plastic material, for example, a teflon bearing.

Since the Teflon bearing has a small frictional resistance, the Teflon bearing is provided inside the groove portion 232, so that the Teflon bearing can smoothly move in a state where the projecting portion 52a is in contact with the rigid electric wire 50 when it is extended or retracted. Here, the sliding portion 234 may be configured to surround the bottom surface and the side surface of the protrusion 52a of the rigid electric cable 50.

The support 230 is coupled to both sides of the body 210 and supports the rigid catenary 50 in a slidable state.

4, the support bracket 300 may include a fixing member 310, an insulator 320, and an angle member 330. [

The support bracket 300 supports the rigid catenary 50 and is installed in the support 10 installed in the ground section or the tunnel section. The support bracket 300 supports the rigid catenary 50 in accordance with the circumstance where the rigid catenary 50 is installed, So that the horizontal displacement and the vertical displacement of the rigid catenary line 50 can be controlled.

The support 10 is a structure installed in a ground section or a tunnel section so as to support the support bracket 300 at a predetermined height, and may be configured to install an H-beam in a terrestrial section or a tunnel section . 5 shows a state in which the support 10 is installed in a tunnel section. The fixing member 310 is composed of one fixing plate 311 and two fixing rods 312.

The fixing plate 311 may be a flat plate which is in close contact with one surface of the support 10, and a hole through which the fixing rod 312 penetrates is formed at four corners thereof.

Each of the fixing rods 312 is formed in a 'C' shape, and both ends of the fixing rods 312 are inserted into holes formed in the fixing plate 311 and fixed by being fastened by a nut.

The fixing plate 311 is disposed on one side of the support 10 so that both ends of the fixing rod 312 are inserted into the holes of the fixing plate 311 on the other surface of the support 10 opposite to the one side of the support 10 The fixing member 310 can be fixed to the support 10 by fastening the nut to both ends of the fixing rod 312 passing through the fixing plate 311 after the fixing rod 312 is positioned.

Two protrusions 311a are formed on the fixing plate 311 of the fixing member 310 so as to face the upper and lower surfaces of the insulator 320 and have through holes. Another through hole is formed.

The bearing bolts 318 are inserted through the through holes in a state where the fixing member 110 and the interposer 120 are disposed so that the through holes of the protruding pieces 311a and the through holes of the long- The long insulator 320 can be rotatably installed.

The elongated insulator 320 is extended from the support 10 to insulate high voltage electricity flowing along the catenary 54 from being transmitted to other structures such as the support 10, ). As described above, one end of the long-term insulator 320 is rotatably supported on the fixing member 310, and the other end is extended in a cantilever shape.

One end of the angle member 330 is fixed to the elongated insulator 320 and the other end of the angle member 330 is provided to extend in the longitudinal direction of the elongated insulator 320. A plurality of positions Adjustment holes 331 are provided.

The position adjusting holes 331 are vertically penetrated by the angle members 330 and are spaced apart from each other by a predetermined distance. The support clamp 200 is supported by the support bracket 300).

More specifically, when the holding plate 240 of the support clamp 200 is fastened through the bolt 242 and the nut 244 in a state where the holding plate 240 is placed on the position adjusting hole 331 at a desired position, May be fixed to the member (330).

Meanwhile, the other end of the angle member 330 is provided with a ground rod connector 350 for securing the safety of the operator from electricity of high voltage during maintenance and repair. The ground rod connector 350 is a rod bent in a " C " shape, and both ends of the rod are fixed to the angle member 330. Accordingly, the grounding rod (not shown) is placed in a space formed between the angle member 330 and the grounding rod connection 350, thereby grounding the grounding rod.

Although the long interposer 320 is rotatably coupled to the fixing member 310 in the present embodiment, the long interposer 320 may be welded to the fixing member 310 by welding, As shown in FIG.

An optical fiber sensor 70 is installed along the rigid electric cable 50 so as to detect a deformation or temperature change of the rigid electric cable 50 according to an embodiment of the present invention, And a fixing part is provided so as to be fixed on the rigid electric wire 50.

6 to 9, the fixing unit may include a fixing clip 400 for fixing the optical fiber sensor at predetermined intervals along the rigid electric wire.

At least a part of the fixing clip 400 may be in a fixed form of the rigid electric wire 50 and another part may be in a form capable of mounting the optical fiber sensor 70.

The fixing clip 400 may include a body 410 and a fixing groove 420 that can be fixed to the protrusion 52a of the rigid catenary 50. [ Specifically, the body 410 extends a predetermined length parallel to the upper surface of the rigid catenary 50, and is fixed to both sides of the body 410 by being fixed to the protrusion 52a. (420) are formed symmetrically.

The width of the fixing groove 420 is formed to correspond to the width of the protrusion 52a and when the fixing clip 420 is fitted in the protrusion 52a, the entire fixing clip 400 is tightly coupled to a predetermined position of the protrusion 52a It plays a role of holding.

The fixing part 430 is formed to extend to a predetermined length below the both side fixing grooves 420. The fixing part 430 has a bent end toward the rigid body 52 and is fixed by the fixing part 430 The optical fiber sensor 70 may be fixedly mounted so as to be in close contact with the rigid body 52.

As shown in FIG. 8, the fixing clip 400 having the above-described configuration is provided with two support clamps 200 fixedly supported by the support bracket 300, The support bracket 300 may be installed at the intermediate point.

Of course, the spacing of the fixing clip 400 is not limited to the above description, and it is possible to increase or decrease the number of the fixing clip 400 if necessary.

When the fixing clip 400 is installed, the fixing clip 400 is held on both sides of the fixing clip 400 and then the fixing groove 420 is fixed to the projecting portion 52a of the rigid electric wire 50. At this time, And the optical fiber sensor 70 is fixed to the rigid body 52 in a state in which the optical fiber sensor 70 is closely attached to the rigid body 52.

In order to facilitate the installation of the fixing clip 400, the fixing clip 400 may be made of an elastic material. In addition, the fixing clip 400 may be fixed to the rigid electric cable 50 while maintaining proper rigidity, It is preferable that the optical fiber sensor 70 is made of a material that can be stuck to the rigid body 52 and fixed thereto.

Specifically, the fixing clip 400 may be made of a tin-plated metal material or stainless steel. In order to prevent corrosion due to contact with the rigid electric wire 50 made of an aluminum material, it should be made of a metal material having a small potential difference with respect to aluminum.

Although the optical fiber sensor 70 can be installed only on one side of the rigid electric cable 50, the optical fiber sensor 70 can be installed on both sides in case one of them is broken.

Meanwhile, the optical fiber sensor 70 may be a DTS (Distributed Temperature Sensor) using Raman scattering light.

When light passes through a transparent dielectric material, some light is scattered due to the inherent inhomogeneity caused by passion fluctuations. When light passes through an optical fiber, which is a dielectric material, various scattering occurs naturally such as Rayleigh, Brillouin, and Raman scattering.

Such light scattering is a harmful part that causes a transmission loss of light in optical communication, but light is scattered in all parts due to the material properties of the optical fiber, so that this information can be a useful part to use the whole optical fiber as an optical sensor by using this information .

In particular, the DTS calculates the distribution temperature and distance by injecting a laser pulse into the optical fiber sensor 70 and measuring the intensity and time of the returning Raman scattering light. The temperature measurement is performed using the relationship between the intensity of Raman scattering light and temperature And distance measurement can be performed by measuring the OTDR (Optical Time Domain Reflectometer) principle, that is, the elapsed time of the returned light and converting it into a distance.

Also, the optical fiber sensor 70 can detect deformation or temperature change of the rigid electric wire 50 using Brillouin scattering light.

The Brillouin scattering light utilizes the property that the Brillouin frequency changes linearly according to the temperature and strain rate applied to the optical fiber sensor 70, and the abnormal temperature rising point and the abnormal strain point can be detected using Brillouin scattering.

The abnormal temperature rise point and the abnormal strain point detection using the Brillouin scattering light can be performed based on the following Equation (1).

ν _B0 : initial Brillouin frequency

ΔT: temperature change

Δε: strain rate change

C _T : Brillouin temperature coefficient

Cε: Brillouin strain rate coefficient

Specifically, the optical fiber sensor 70 using Brillouin scattering obtains the information of the measurement amount and the measurement position by measuring the Brillouin scattering light generated when the light incident into the optical fiber passes through the optical fiber core.

In this embodiment, in particular, Brillouin scattering measurement method, Brillouin correlation measuring method (Brillouin correlation method), which is a method of generating stimulated Brillouin scattering in a position-selective manner by using pump light and probe light of a continuous wave form, optical correlation domain analysis (BOCDA) can be used.

The BOCDA system has many advantages such as high spatial resolution, fast sampling rate, and arbitrary selection of measurement points. The BOCDA system uses a frequency-modulated position selection scheme called a synthesis of optical coherence function (SOCF), which modulates the frequency of the light source in sinusoidal form by direct current modulation.

Then, the modulated light wave is divided into two directions using a coupler, and a probe light and a pump light having a frequency offset of? V are generated by a sideband generation method using a single-sideband modulator (SSBM).

The two light waves generate stimulated brillouin scattering (SBS) while advancing the sensing fiber to be measured in both directions. Since the frequency of the two light waves is changed into a sinusoidal wave by the wave modulation of the light source, the power spectrum corresponding to the frequency difference is observed through the averaging over time, And it is possible to selectively induce Brillouin scattering at a specific point only.

The peak of the frequency difference that is formed periodically is called the correlation peak, and the Brillouin frequency measurement of the BOCDA system is made at this correlation point. Since the frequency modulation of the light source has a periodicity in the form of a sine wave, the correlation point appears periodically in the space, and the period of the correlation point becomes the measurement range of the system.

The position to be measured can be changed by changing the modulation frequency, and the parameters such as the spatial resolution and the measurement range, which determine the performance of the system, are all determined by the modulation parameters of the light source.

10 is a cross-sectional view illustrating a state where the optical fiber sensor is fixed to a mounting groove according to an embodiment of the present invention.

Referring to FIG. 10, the fixing part may consist of a mounting groove 58 formed continuously along the rigid electric wire 50 to fix the optical fiber sensor 70, unlike the previous embodiment.

The fixed groove 58 may be formed on one side or both sides of the rigid body 52 constituting the rigid electric wire 50. It is also possible to attach a separate member to the rigid cable 50 by welding or the like, When the catenary line 50 is manufactured, it can be integrally formed.

The entrance of the fixing groove 58 is formed to be slightly smaller than the outer diameter of the optical fiber sensor 70 so that the optical fiber sensor 70 can be fixedly inserted into the fixing groove 58 in an interference fit manner.

The rigid body line monitoring system according to the embodiments of the present invention described above can precisely and quickly grasp the deflection or temperature rise of a rigid body line and prevent arc generation and wear of the line, , It is possible to accurately detect the deformation or the temperature change of the rigid body line without being influenced by the magnetic field generated from the rigid body line, thereby improving the reliability of the line. In addition, it is possible to reduce the installation and maintenance cost by detecting the deformation and the temperature change of the rigid body line by a simple structure change.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

50: Rigid body line 100: Expansion joint
200: Support clamp 300: Support bracket
400: Fixing clip

Claims (7)

Rigid body line;
A support clamp for supporting the rigid electric wire in a fixed or slidable manner;
A support bracket fixedly or rotatably connected to a wall surface of a tunnel or a support provided on the ground and fixing and supporting the support clamp;
An optical fiber sensor provided along the rigid electric wire to detect a deformation or temperature change of the rigid electric wire; And
And a fixing unit fixing the optical fiber sensor on the rigid electric wire. The method according to claim 1,
Wherein the fixing portion includes a fixing clip for fixing the optical fiber sensor at regular intervals along the rigid electric wire. 3. The method of claim 2,
Wherein the fixing clip is made of an elastic material. 3. The method of claim 2,
Wherein the fixing clip is made of tin-plated metal or stainless steel. The method according to claim 1,
Wherein the fixing portion includes a mounting groove continuously formed along the rigid electric wire to fix the optical fiber sensor. 6. The method according to any one of claims 1 to 5,
Wherein the optical fiber sensor is a DTS (Distributed Temperature Sensor) using Raman scattering light. 6. The method according to any one of claims 1 to 5,
Wherein the optical fiber sensor detects a deformation or temperature change of a rigid electric wire using Brillouin scattering light.

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