WO2016027966A1

WO2016027966A1 - Failure monitoring system and failure monitoring method for optoelectronic cable assembly

Info

Publication number: WO2016027966A1
Application number: PCT/KR2015/005462
Authority: WO
Inventors: 박지상; 박래혁; 양은정; 주형준
Original assignee: 엘에스전선 주식회사
Priority date: 2014-08-19
Filing date: 2015-06-01
Publication date: 2016-02-25

Abstract

The present invention relates to a failure monitoring system and a failure monitoring method for an optoelectronic cable assembly. The failure monitoring system for an optoelectronic cable assembly according to the present invention comprises a power line unit having a conductor, and an optical fiber unit provided adjacent to the power line unit and having one or more optical fibers, and the failure monitoring system is characterised by comprising: a voltage supply unit selectively connected to the conductor to thus supply a voltage having a predetermined value or more; and a monitoring device for sensing, by optical signals of the one or more optical fibers, acoustic signals generated from the power line unit and thus determining whether or not a failure in the power line unit occurs and determining the location where the failure occurs.

Description

Fault Monitoring System and Fault Monitoring Method for Photoelectric Cable Assemblies

The present invention relates to a failure monitoring system and a failure monitoring method for an optical cable assembly, and more particularly, in an optical cable assembly including a power line unit and an optical fiber unit, the failure of the power line unit and the location of the failure occurs in the optical fiber unit. The present invention relates to a failure monitoring system and a method for monitoring the failure.

In general, cables used as power and / or communication transmission means require immediate recovery in the event of a failure during their installation or after use. In particular, even if a very sophisticated and advanced construction technology is applied in the case of the submarine cable installed across the sea, obstacles may occur during the construction of the submarine cable, and during the use of the submarine cable, such as fishing activities or submarine earthquake, etc. Environmental factors can cause the submarine cable to fail.

In order to recover from the failure of the cable, it is very important to accurately detect the location of the failure. In particular, since the submarine cable is installed through the sea, it is necessary to accurately detect the location of the failure without error, thereby reducing the cost and time required to perform the recovery process.

Optical time domain reflectometer (OTDR) is widely used as a monitoring system for detecting the failure. The OTDR system can detect a location where a failure occurs with a very high level of accuracy, but it can be applied to an optical fiber with optical fiber because it uses scattered light of supervisory light, and can not be applied to other power lines.

In addition, in the case of a TDR similar to the OTDR, it is possible to detect a failure of a power line, but it is accompanied with a problem that its accuracy is much lower than that of the OTDR.

Furthermore, even in the Murray loop method which determines the distance by the resistance value up to the point of failure, the error rate is known to be quite large.

In the case of a power line failure, there is a so-called 'Thumping method' as a way of detecting the location of the failure relatively accurately. The method detects an acoustic signal caused by a magnetic change or a partial discharge generated at a fault point of the power line when a high voltage is applied to the power line. According to the method, a magnetic sensor for sensing the magnetic force change or a microphone for detecting the magnetic force change is applied by applying a relatively high voltage to the power line and the cable is installed to detect the magnetic force change or the acoustic signal. Determine the point of failure.

By the way, the thumping method is relatively easy to detect the point of failure occurs in the case of the underground line is installed on the land, but the detection is not easy when the power line is installed across the sea. In the case of a submarine cable, a diver may detect a magnetic sensor or a microphone by moving the magnetic sensor or microphone along the submarine cable in order to detect a failure point by the above method, or by applying the magnetic sensor or the microphone to a robot moving the submarine. Can be installed and detected. However, such a detection method is significantly higher in cost and time than the detection of underground ships, and is accompanied by a problem that the detection is very difficult due to the seabed environment such as currents and depths. Furthermore, when the voltage applied to the power line is increased to facilitate the detection of a magnetic force change or an acoustic signal on the seabed, the power line may be damaged.

An object of the present invention is to provide a failure monitoring system and a failure monitoring method capable of accurately detecting a failure point of the power line in order to solve the above problems.

In addition, an object of the present invention is to provide a failure monitoring system and a failure monitoring method in which the cost and time are significantly reduced when a monitoring system for detecting a failure point of the power line is constructed.

Furthermore, an object of the present invention is to provide a failure monitoring system and a failure monitoring method that can detect the failure point of the power line significantly faster and more accurately than the conventional cost and time.

An object of the present invention as described above is in the fault monitoring system for an optical cable assembly having a power line unit having a conductor and an optical fiber unit provided adjacent to the power line unit and having at least one optical fiber, wherein the conductor is selectively A voltage supply unit connected to supply a voltage equal to or greater than a predetermined value, and a monitoring device for detecting a failure of the power line unit and a location of the failure by detecting an acoustic signal generated by the power line unit by an optical signal of the at least one optical fiber. It is achieved by a failure monitoring system of the photoelectric cable assembly characterized in that it comprises a.

Here, the voltage supply unit may supply a voltage having a predetermined pattern. In addition, the voltage supply unit may intermittently supply a waveform corresponding to the second voltage value having a relatively larger value than the predetermined first voltage value.

The voltage supply unit may increase the supplied voltage in a predetermined unit when the failure is not detected by the monitoring apparatus.

Furthermore, the monitoring apparatus may include an OTDR for inputting monitoring light into the optical fiber and receiving the scattered monitoring light, and an analysis device for detecting whether a failure occurs and a location where the failure occurs by analyzing a waveform of the received monitoring light. have.

Here, the OTDR may inject the monitoring light having a wavelength of a relatively narrow band into the optical fiber.

On the other hand, the analysis device detects the change in the intensity of the monitoring light received from the optical fiber by the acoustic signal generated by the power line unit may determine that the failure occurs when the intensity change is more than a predetermined reference value.

In addition, the analysis apparatus stores distance information indicating a relative relationship between the distance of the photoelectric cable assembly and the distance of the optical fiber unit when the optical cable assembly is installed, and the distance determined by the optical fiber unit when the failure occurs. May be converted into a distance of the photoelectric cable assembly according to the distance information.

Furthermore, the optical fiber unit and the power line unit may form a photoelectric composite cable.

On the other hand, the object of the present invention as described above in the fault monitoring method of the photoelectric cable assembly comprising a power line unit having a conductor and an optical fiber unit provided adjacent to the power line unit and having at least one optical fiber, the power line unit Applying a voltage to a conductor of the light source, injecting monitoring light into the optical fiber unit to detect an acoustic signal generated by the power line unit, and receiving the scattered monitoring light, analyzing a waveform of the scattered monitoring light, and analyzing the power line It is achieved by a failure monitoring method of the photoelectric cable assembly comprising the step of determining whether a failure of the unit and the step of detecting the failure occurs when it is determined that the failure has occurred.

The method may further include setting a voltage initial value supplied to the conductor of the power line unit.

Meanwhile, when it is determined that the failure does not occur, the method may further include increasing the voltage applied to the conductor of the power line unit in a predetermined unit.

Furthermore, in the step of applying a voltage to the conductor of the power line unit, a voltage having a predetermined pattern may be supplied to the conductor of the power line unit. In this case, applying the voltage to the conductor of the power line unit may intermittently supply a waveform corresponding to the second voltage value having a relatively larger value than the predetermined first voltage value.

On the other hand, the step of determining whether or not the failure occurs may determine whether the failure occurs by analyzing the waveform of the received monitoring light.

At this time, the monitoring light having a wavelength of a relatively narrow band can be incident to the optical fiber.

On the other hand, the step of determining whether or not the occurrence of the failure may detect the change in intensity due to the phase change of the received monitoring light may determine that the failure occurs when the change in intensity is greater than a predetermined reference value.

On the other hand, in the case of installing the opto-optic cable assembly further comprises the step of storing in advance the distance information showing the relative relationship between the distance of the photoelectric cable assembly and the distance of the optical fiber unit, and in case of detecting the location of the failure The distance determined by the optical fiber unit may be converted into the distance of the photoelectric cable assembly according to the distance information.

According to the present invention as described above it is possible to detect the point of failure accurately and quickly when a failure occurs in the power line unit.

In addition, according to the present invention, when detecting a failure point of the power line unit by using the optical fiber unit provided adjacent to the power line unit, it is necessary to build the monitoring system by eliminating the additional equipment for the failure monitoring Costs and time can be significantly reduced. In addition, by utilizing the optical fiber unit it is possible to significantly reduce the time and cost used to monitor the failure of the power line unit compared with the conventional.

Furthermore, the present invention can accurately and quickly determine the failure point by detecting the acoustic signal generated at the failure point of the power line unit by the optical fiber unit.

1 is a cross-sectional view showing the structure of a photoelectric composite cable which is one of the photoelectric cable assemblies;

2 is a cross-sectional view showing a binding cable in which a power line unit and an optical fiber unit are simply bound as one of the photoelectric cable assemblies;

3 is a schematic diagram showing a schematic configuration of an OTDR system;

4 is a graph showing the intensity of the monitoring light according to the distance in FIG.

5 is a schematic diagram showing the configuration of a failure monitoring system for monitoring a failure of an optoelectronic cable assembly according to the present invention;

FIG. 6 is a schematic diagram illustrating a change in monitoring light of an optical fiber unit due to an acoustic signal generated in the power line unit in FIG. 5;

7 is a graph showing waveforms of monitoring light analyzed by the monitoring apparatus in FIG. 5;

FIG. 8 is a graph illustrating a pattern of a voltage supplied to the power line unit in FIG. 5;

9 is a flowchart illustrating a fault monitoring method for fault monitoring of an optoelectronic cable assembly according to the present invention;

10 is a schematic diagram showing a relative arrangement of an optical fiber unit and a power line unit in the optoelectronic cable assembly;

FIG. 11 is a schematic diagram showing a method of detecting a relative length of the optical fiber unit and the optical cable assembly by the monitoring apparatus when the optical cable assembly is embedded in the seabed; FIG.

12 is a graph showing the relative lengths of the optical fiber unit and the optical cable assembly.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As described above, when a power failure occurs in the power line unit that delivers power, and a voltage is supplied to the power line unit to detect the location of the failure, the acoustic signal generated at the failure point of the power line unit can be detected accurately and quickly. In the present invention, the optical fiber unit disposed adjacent to the power line unit is used. That is, in the present invention, the fault position of the power line unit is sensed using a so-called 'photoelectric cable assembly' in which the power line unit and the optical fiber unit are disposed adjacent to each other. As used herein, the term 'optical fiber and power line aggregated cable' refers to the optical fiber unit and the optical fiber unit together with the optical fiber and power line composite cable connected to the optical fiber unit and the power line unit by a filler. The power line unit is defined as including all binding cables simply bound by taping or the like. Hereinafter, the structure of the photoelectric composite cable will be described and the fault monitoring system and fault monitoring method will be described below.

1 and 2 are cross-sectional views illustrating the configuration of an optical cable assembly having an optical fiber unit 100 and a power line unit 300.

1 is a cross-sectional view showing the configuration of a photoelectric composite cable 1000 in the photoelectric cable assembly.

Referring to FIG. 1, the photoelectric composite cable 1000 is illustrated as an example of a three-phase cable having three power line units 300, but is not limited thereto and may be applied to a single-core cable having one power line unit. . The power line unit 300 includes a conductor 310 made of a conductive material such as copper and aluminum, and wraps the conductor 310 and removes the air layer between the conductor 310 and the insulating layer 320 described later. Insulation surrounding the inner semiconducting layer 330 and the inner semiconducting layer 330, which suppresses partial discharge at an interface with the panel and mitigates local electric field concentration in the insulating layer 320. The layer 320 includes an outer semiconducting layer 340 that surrounds the insulating layer 320 and serves to shield the cable and to apply an even electric field to the insulating layer 320.

In addition, the power line unit 300 may further include a metal sheath 350 and a polymer sheath 360 surrounding the metal sheath 350 on the outside of the outer semiconducting layer 340.

Herein, materials and specifications of the conductor 310, the inner semiconducting layer 330, the insulating layer 320, the outer semiconducting layer 340, the metal sheath 350 and the polymer sheath 360 of the power line unit 300 may be used. Silver may vary depending on the use of the photoelectric composite cable, transmission voltage and the like.

Meanwhile, the optical fiber unit 100 is provided adjacent to one or more power line units 300. The optical fiber unit 100 may include at least one optical fiber 111 and a tube 112 for receiving the optical fiber 111.

Each of the optical fiber units 100 includes a predetermined number of optical fibers 111 mounted together with the filler 113 in the tube 112, and the tube may be made of a rigid material such as stainless steel. The optical fiber unit 100 may further include a sheath 130 surrounding the tube 112.

On the other hand, when the photoelectric composite cable 1000 is made of a subsea photoelectric composite cable installed across a seabed such as the sea, for example, various protective layers for protecting internal components even in harsh environments such as seawater, salt, etc. in the sea. It may be provided. For example, as shown in FIG. 1, a bedding layer 700 including a polypropylene (PP) yarn or the like surrounding the power line unit 300 and the optical fiber unit 100, and the bedding layer 700. Is provided on the outside of the wire sheath 710 to improve the mechanical strength of the optical composite power cable 1000 and the jacket 720 provided on the outside of the wire sheath 710 may be provided. In addition, the optical composite power cable 1000 may include a filler 400 to protect the power line unit 300 and the optical fiber unit 100 inside the bedding layer 700.

2 is a cross-sectional view illustrating a binding cable 1000 ′ in which the optical fiber unit 100 and the power line unit 300 are simply bound by taping or the like in the optical cable assembly.

Referring to FIG. 2, the binding cable 1000 ′ has a structure in which the optical fiber unit 100 and the power line unit 300 are connected by taping 800 or the like. The structures of the optical fiber unit 100 and the power line unit 300 are similar to those of the embodiment of FIG. 1 described above, and thus repeated descriptions thereof will be omitted.

On the other hand, Figure 3 shows a monitoring system 10 using the OTDR to detect the failure position when a failure occurs in the P2MP type optical path formed by the optical fiber unit.

Referring to FIG. 3, at the supplier-side optical line terminal 12 (OLT: hereinafter referred to as a 'provider-side terminal') installed at a central office (CO) and at least a branch at which the optical path is branched One splitter module 20 and a consumer side terminal (ONT: Optical Network Terminal) 40 to which an optical path is connected are provided.

The provider terminal 12 is provided in a central base station such as a telephone station to generate signal light having a plurality of wavelengths different from each other, and multiplex it to be transmitted to the consumer terminal 40 through the splitter module 20.

The splitter module 20 splits the multiplexed signal light provided from the supplier side terminal 12 for each wavelength and transmits the multiplexed signal light to the consumer side terminal 40.

On the other hand, the monitoring system 10 may be provided with a monitoring device 50 that is selectively connected to the optical fiber unit of the optical path. The monitoring device 50 may include an analyzer 80 described later together with an optical time domain reflectometery (OTDR) sensor or an OTDR unit.

Looking more closely at the monitoring device 50 provided with the OTDR unit described above, the OTDR unit generates monitoring light having a wavelength different from that of the supplier-side terminal 12. That is, the monitoring device 50 uses monitoring light having a different band from the signal light. This prevents the wavelengths of the signal light and the supervisor from overlapping each other so that the signal light is not affected by the supervisory light. For example, the wavelength of the signal light is approximately 1600 nm or less and may have a wavelength of 1310 nm, 1490 nm, 1550 nm, or the like. On the contrary, the wavelength of the monitoring light may be about 1600 nm or more, and specifically, the wavelength of the monitoring light may be about 1625 or 1650 nm. By injecting such monitoring light into the optical path and analyzing the distance distribution of the amount of light reflected and scattered at each point along the longitudinal direction of the optical path, the loss of the optical path, the distance to the connection point of the consumer terminal, the connection loss and the amount of reflection from the connection point, In the event of a failure in the optical path, the distance to the point of failure can be measured.

Specifically, the monitoring device 50 including the OTDR unit is connected to the optical fiber of each optical path through the WDM coupler 14. In this case, the monitoring light generated and transmitted by the OTDR unit is combined with the signal light via the WDM coupler 14. On the other hand, when the incident monitoring light is received scattered or reflected, the peak according to the length of each line branched from one supplier side terminal is shown at different distances in the OTDR unit. Therefore, the operator can determine which line peak is by checking the distance of the peak along each line in the OTDR unit. In addition, reflecting means, for example, the filter unit 60, may be provided to reflect only the monitoring light while passing the signal light through the input terminal of each consumer-side terminal 40 to reflect the monitoring light. The filter unit 60 may be provided in a connector connecting the consumer side terminal 40 and the optical path. As such, when the filter unit 60 is provided, the peak signal reflected at the end of the optical path, that is, at the input terminal of the consumer side terminal 40 becomes larger, so that peak detection through the OTDR unit can be more easily performed.

Meanwhile, the monitoring device 50 having the above-described OTDR unit may be connected to the WDM coupler 14 through an optical switching unit 70. In this case, the optical switching unit 70 may connect the plurality of WDM couplers 14 and the monitoring device 50 to each other. That is, the plurality of WDM coupler 14 is connected to the monitoring device 50 through one optical switching unit 70 can reduce the installation cost, installation time and installation space.

4 is a graph from which a waveform of monitoring light is derived from the above-described monitoring device. In the graph, the horizontal axis shows distance (km) and the vertical axis shows light intensity (dB).

Referring to FIG. 4, the monitoring light measured by the monitoring device suffers a certain loss (dB / km) per distance of the optical fiber and is reduced to a predetermined slope as shown in the drawing. Looking at the waveform of the monitoring light, as shown in the figure includes a predetermined noise. On the other hand, the waveform of the monitoring light may generate an abnormal waveform in the form of peaks and steps, and compares the abnormal waveform with a normal case where no failure occurs, and determines whether there is a failure, and further, the distance to the abnormal waveform is determined by the speed of light In the case of failure due to the inversion through the arrival time, the distance to the point where the peak of the input terminal of the consumer side occurs can be identified.

By the way, the conventional monitoring system using the OTDR has the advantage that it is easy to determine the failure of the optical fiber unit having an optical fiber, it is possible to detect the failure position relatively accurately and quickly. However, the conventional monitoring system can be used only for the fault determination of the optical fiber unit having the optical fiber as described above, for example, there is a problem that can not be applied to the fault determination and fault position detection of the power line unit. Hereinafter, a failure monitoring system and a failure monitoring method for monitoring a failure of the power line unit using the optical fiber unit in an optical fiber assembly having an optical fiber unit and a power line unit will be described.

5 illustrates a configuration of a failure monitoring system for monitoring a failure of the power line unit using the optical fiber unit 100 in the photoelectric cable assembly having the optical fiber unit 100 and the power line unit 300 according to the present invention. Schematic diagram.

Referring to FIG. 5, the monitoring system is selectively connected to the conductor 310 of the power line unit 300 to supply a voltage equal to or greater than a predetermined value, and the sound generated from the power line unit 300. And a monitoring device 2000 for detecting the signal 304 by the optical signal of the one or more optical fibers 111 and determining whether the power line unit 300 has a failure and the location where the failure has occurred.

In the present invention, the failure monitoring system applies a so-called 'Thumping method' for detecting a sound signal generated at the failure point 302 of the power line unit 300 by supplying a voltage to the power line unit 300, the sound In order to detect a signal, the optical fiber 111 of the optical fiber unit 100 provided adjacent to the power line unit 300 is used.

In this case, the monitoring device 2000 analyzes the waveform of the monitoring light in the OTDR 2100 and the optical fiber 111 which enters the monitoring light into the optical fiber 111 and receives the scattered monitoring light, and whether or not a failure occurs. It may be provided with an analysis device 2200 for detecting the location of the failure. As described above with respect to the configuration of the OTDR 2100, a configuration in which a monitoring light having a wavelength different from that of the signal light is monitored for a line already using the signal light, and in the case of a light path that is not in operation, sets an operating wavelength of the signal light. There is a configuration that monitors the wavelength of the included monitoring light, and repeated description of the configuration is omitted.

FIG. 6 is a schematic diagram illustrating a change in monitoring light scattered from the optical fiber 111 by an acoustic signal generated at a failure point of the power line unit 300.

5 and 6, when a voltage of a predetermined value is supplied to the power line unit 300 by the voltage supply unit 3000, the failure occurs when the power line unit 300 has a fault 302. A partial discharge of the point 302 results in an acoustic signal 304. The acoustic signal 304 affects the monitoring light 115 of the optical fiber 111 of the adjacent optical fiber unit 100. That is, the change of the medium such as the density of the optical fiber 111 is generated by the acoustic signal 304, whereby the monitoring light 115A of the optical fiber 111 affected by the acoustic signal 304 is Compared to the monitoring light 115 of the other region of the optical fiber 111 is a phase change occurs. The phase change of the optical fiber 111 may be sensed through the OTDR 2100 and the analyzer 2200 of the monitoring device 2000.

7 shows a graph in which the monitoring light in which the phase change has occurred is measured by the OTDR 2100.

The above-described analyzer 2200 detects an intensity change caused by a phase change of monitoring light scattered from the optical fiber 111 by an acoustic signal propagated due to a failure in the power line unit, and the intensity change is greater than or equal to a predetermined reference value. It is determined that the failure has occurred to detect the location of the failure.

Specifically, when the phase change occurs in the monitoring light by the acoustic signal, the change occurs in the waveform of the monitoring light as shown in FIG. 7, for example, to form a predetermined peak as shown in the drawing. do. Therefore, it may be determined that the power line unit 300 has a failure when the peak is compared with a predetermined reference value. Furthermore, it is possible to detect the distance of the point where the failure occurred through the position of the peak.

On the other hand, as described above, when the voltage supply unit 3000 supplies the voltage to the power line unit 300, the voltage supply unit 3000 to more easily detect the sound signal generated at the point of occurrence of the failure A voltage having a predetermined pattern can be supplied. 8 illustrates a pattern according to an example of a voltage supplied to the power line unit by the voltage supply unit 3000.

As illustrated in FIG. 8, the supplied voltage pattern may intermittently supply a waveform corresponding to a second voltage value having a relatively larger value than a predetermined first voltage value. When the voltage according to the pattern is supplied, the change in the acoustic signal generated at the point of failure of the power line unit 300 becomes clearer than the case of supplying a voltage having a flat waveform, whereby the noise and the point of failure are caused. There is an advantage in that it is possible to more easily distinguish the change in the acoustic signal that occurs in. The pattern of the voltage supplied from the voltage supply unit 3000 is not limited to the above-described pattern of FIG. 8 and may be modified in various forms.

On the other hand, the OTDR 2100 may use a so-called 'Coherent OTDR' using supervisory light having a narrow wavelength band, that is, supervisory light having a narrow band wavelength, in order to detect a phase change of an optical signal. As described above, when a stimulus is applied by an acoustic signal generated at the point of failure, a medium change occurs inside the optical fiber, which causes a phase change of the optical signal. In this case, a change in the size of the interference light occurs in the receiver that receives the optical signal due to the phase change, because there is a so-called 'coherent' characteristic that occurs in a pattern with a constant phase according to the position and time of the light. By using the 'Coherent OTDR', the acoustic signal can be easily detected, and the fault determination and the position detection can be made more easily.

On the other hand, when the voltage is applied by the voltage supply unit 3000, the higher the voltage can be more easily detect the acoustic signal generated at the point of failure of the power line unit 300. However, when the voltage supplied to the power line unit 300 becomes high, damage may occur to the power line unit 300 by a partial discharge occurring at a failure point of the power line unit 300. Therefore, in the present embodiment, when the failure of the power line unit 300 is suspected, the voltage supply unit 3000 may increase the voltage supplied to the power line unit 300 in a predetermined unit. That is, when a failure of the power line unit 300 is suspected due to a power drop of the power line unit 300 or the like, the voltage supply unit 3000 sets a relatively low voltage initial value and supplies the power line unit 300 to the power line unit 300. Done.

In this case, the monitoring light is measured and analyzed by the OTDR 2100 and the analyzer 2200 to determine whether there is a failure and to detect a location of the failure. However, when the voltage is supplied by the initial voltage value, when the failure is not determined by the power line unit 300, the voltage supply unit 3000 increases the voltage supplied to the power line unit 300 in a predetermined unit. Will be supplied. That is, when a failure of the power line unit 300 is suspected but the failure is not detected, the voltage value supplied to the power line unit 300 is increased in a predetermined unit and supplied. When the voltage value supplied to the power line unit 300 is increased, the acoustic signal generated at the point of occurrence of the failure of the power line unit 300 can be detected more clearly, so that the failure determination and the position detection can be facilitated. However, when the voltage value supplied to the power line unit 300 is raised to a predetermined value or more, as described above, the power line unit 300 may be damaged by the supplied voltage itself. Therefore, the upper limit of the voltage supplied to the power line unit 300 may be determined to be an appropriate value that does not cause damage to the power line unit 300.

9 is a flowchart illustrating a fault monitoring method for fault monitoring of an optoelectronic cable assembly according to the present invention.

Referring to FIG. 9, the fault monitoring method includes applying a voltage to the conductor 310 of the power line unit 300 (S910), and detecting the sound signal generated by the power line unit 300. Injecting the monitoring light into the optical fiber of 100 and receiving the scattered monitoring light (S930), and analyzing the waveform of the scattered monitoring light to determine whether the power line unit has a failure (S950) and that the failure has occurred If it is determined whether or not detecting the failure location includes a step (S970).

First, the voltage supply unit 3000 supplies a voltage to the power line unit 300 (S910). In this case, as described in FIG. 8, the voltage may be supplied with a predetermined pattern. Since it has been described above with reference to FIG. 8, repeated description thereof will be omitted.

The voltage supply unit 3000 may set an initial voltage value to be supplied before supplying a voltage to the conductor 310 of the power line unit 300. As described above, the voltage initial value may be set relatively low. The monitoring system according to the present invention is very sensitive because it detects the occurrence of the failure and the location of the power line unit 300 by the optical fiber 111 of the optical fiber unit 100. Therefore, the failure of the power line unit 300 can be sufficiently detected even at a relatively lower voltage value than the conventional method.

Subsequently, in order to detect an acoustic signal generated at the point of failure of the power line unit 300, the monitoring light is incident on the optical fiber of the optical fiber unit 100 and the scattered monitoring light is received (S930). As described above, the OTDR 2100 enters the monitoring light into the optical fiber 111 of the optical fiber unit 100 and receives the scattered monitoring light. In this case, when the OTDR 2100 enters the monitoring light, the OTDR 2100 enters the monitoring light having the narrow band wavelength.

After the scattered monitoring light is received by the OTDR 2100, the analyzer 2200 analyzes a waveform of the monitoring light to detect whether a failure occurs (S950) and a location where the failure occurs (S970).

The analyzer 2200 detects a change in intensity of the monitoring light due to a phase change of the monitoring light scattered from the optical fiber 111. Here, the intensity change will be shown in the form of a predetermined peak in the waveform of the monitoring light. Therefore, the intensity change (peak) is compared with a predetermined reference value to determine whether a failure occurs (S950), and if it is determined that a failure occurs, the location where the failure occurs is detected (S970).

On the other hand, when it is determined that the failure of the power line unit 300 by the analysis of the analysis device 2200 in consideration of the fact that the acoustic signal generated at the point of failure is not accurately detected the voltage supply unit 3000 ) Increases the voltage supplied to the power line unit 300 in a predetermined unit (S955) and supplies the voltage to the power line unit 300. The increasing of the voltage in a predetermined unit may be performed for a plurality of predetermined times or until the voltage value is increased to an appropriate upper limit that does not cause damage to the power line unit 300.

On the other hand, in the case of the surveillance system described above, it is very important to detect the location where the failure occurred in addition to the failure determination. However, as described above, various monitoring systems have an error rate to some extent for various reasons, and various efforts have been made to reduce the error rate. Hereinafter, an embodiment of the present invention can reduce the error rate.

FIG. 10 is a schematic diagram illustrating a relative distance between the photoelectric composite cable 1000 and the optical fiber unit 100 when the photoelectric composite cable 1000 of FIG. 1 is installed.

Referring to FIG. 10, when the photoelectric composite cable 1000 is installed, the optical fiber unit 100 is arranged in a curved shape rather than a straight shape as shown in FIG. 10. Can be. Therefore, an error may occur between the distance L _cable of the photoelectric composite cable 1000 and the distance of the optical fiber unit L _{optical fiber} . In particular, as the length of the photoelectric composite cable 1000 increases, such as a submarine cable, The error becomes even larger.

Therefore, in the conventional OTDR method of injecting the monitoring light into the optical fiber 111 of the optical fiber unit 100 and measuring the distance by the monitoring light, the photoelectric composite cable ( Since it is applied to the distance of 1000, due to the difference in distance between the photoelectric composite cable 1000 and the optical fiber unit 100 may not accurately detect the point of failure occurs, an error may occur.

In order to prevent this, in the present embodiment, when the photoelectric composite cable 1000 is installed as shown in FIG. 11, for example, when the photoelectric composite cable 1000 is installed on the sea floor by the ship 4000, the above-described monitoring is performed. The relative distance between the photoelectric composite cable 1000 and the optical fiber unit 100 may be measured using the system. That is, when the photoelectric composite cable 1000 is installed, the installation distance of the photoelectric composite cable 1000 may be calculated by measuring in real time the length of the cable installed toward the seabed in the vessel 4000. For example, in the process of laying the photoelectric composite cable, an acoustic signal is generated by artificially impacting the photoelectric composite cable at a specific position of the ship, and at the same time, the base position of the optical fiber at the acoustic signal generating point using the fault monitoring system. Recognizing and mapping the position of the photonic composite cable position and the optical fiber (mapping) can be improved the problem position error problem due to the mismatch of the optical fiber length and the photonic composite cable length.

On the other hand, the distance of the optical fiber unit 100 disposed inside the photoelectric composite cable 1000 is the monitoring light to the optical fiber unit 100 by the monitoring device 2000 when the photoelectric composite cable 1000 is installed The incident distance of the optical fiber unit 100 may be measured by measuring the monitoring light. In this case, the monitoring light may be incident at a predetermined period or may be incident with a predetermined waveform.

FIG. 12 is a graph showing the distance of the photoelectric composite cable 1000 and the length of the optical fiber 111 of the optical fiber unit 100 by the above-described method.

Referring to FIG. 12, when the optical fiber unit 100 is disposed in a straight line shape inside the photoelectric composite cable 1000, as in the case where the photoelectric composite cable 1000 is installed, the photoelectric composite cable 1000 is installed. ) Distance (L _cable ) and the distance (L _optical fiber) of the optical fiber unit 100 is the same to show a direct relationship in the form of "A" in FIG. In this case, the distance of the point where the failure occurs by the optical fiber unit 100 is measured (L ₁ ) and even if it is applied to the photoelectric composite cable 1000 as it has the same distance (L ₁ ), an error occurs in the distance. I never do that.

However, when the optical fiber unit 100 is arranged in a curved shape inside the photoelectric composite cable 1000 as described above, a relationship graph having an arbitrary shape as shown in FIG. 12 is formed. In this case, the distance in which the failure occurs by the optical fiber unit 100 is measured (L ₁ ), and when it is converted into the photoelectric composite cable 1000, the distance in which the failure occurs in the photoelectric composite cable 1000 is 'L ₁ '. Rather, it corresponds to the distance of 'L ₂ '. Therefore, when comparing the relationship graph of "A" type in the distance of the photoelectric composite cable 1000, in the relationship graph of "B" type, the distance where the failure occurs in the photoelectric composite cable 1000 is "L ₁ -L ₂ ". Will change as much.

Therefore, when the photoelectric composite cable 1000 is installed, distance information as shown in FIG. 12 showing a relative relationship between the installation distance of the photoelectric composite cable 1000 and the distance of the optical fiber unit 100 is shown in the graph or table. In the same manner it may be stored in the analysis device 2200 of the above-described monitoring device 2000. In this case, when the actual failure occurs and the distance is measured by the optical fiber unit 100 and the distance is converted to the distance of the photoelectric composite cable 1000 by measuring the distance shown in FIG. It can be converted using a graph or a table. As a result, the distance of the point where the failure occurs more accurately can be detected by the photoelectric composite cable 1000.

On the other hand, the above description of Figures 10 to 12 described as an example of the photoelectric composite cable, but is not limited to this is another type of cable in which the optical fiber unit is disposed adjacent to the power line unit, for example simply bound as shown in FIG. It is of course also applicable to optoelectronic cable assemblies including binding cables.

Claims

In the fault monitoring system of a photoelectric cable assembly comprising a power line unit having a conductor and an optical fiber unit provided adjacent to the power line unit and having at least one optical fiber,

A voltage supply unit selectively connected to the conductor to supply a voltage equal to or greater than a predetermined value; And

And a monitoring device that detects an acoustic signal generated by the power line unit by an optical signal of the at least one optical fiber and determines whether the power line unit has a failure and a location where the failure has occurred. Surveillance system.
The method of claim 1,

The voltage supply unit fault monitoring system for an optical cable assembly, characterized in that for supplying a voltage having a predetermined pattern.
The method of claim 2,

And the voltage supply unit intermittently supplies a waveform corresponding to a second voltage value having a relatively larger value than a predetermined first voltage value.
The method of claim 2,

And the voltage supply unit increases the supplied voltage by a predetermined unit when the failure is not detected by the monitoring device.
The method of claim 1,

The monitoring device

An OTDR for injecting surveillance light into the optical fiber and receiving scattered surveillance light; And

And an analysis device for analyzing whether the failure occurs and detecting a location of the failure by analyzing the waveform of the received monitoring light.
The method of claim 5,

The OTDR is a failure monitoring system for the optical cable assembly, characterized in that for entering the monitoring light having a relatively narrow band wavelength to the optical fiber.
The method of claim 5,

The analyzing apparatus detects a change in intensity of the monitoring light received from the optical fiber by an acoustic signal generated by the power line unit, and determines that the failure occurs when the change in intensity exceeds a predetermined reference value. Fault monitoring system.
The method of claim 7, wherein

The analysis apparatus stores distance information indicating a relative relationship between the distance of the photoelectric cable assembly and the distance of the optical fiber unit when the optical cable assembly is installed, and the distance determined by the optical fiber unit when the failure occurs. Disability monitoring system for an optical cable assembly, characterized in that converted to the distance of the optical cable assembly according to the distance information.
The method of claim 1,

And the optical fiber unit and the power line unit form a photoelectric composite cable.
In the fault monitoring method of the photoelectric cable assembly comprising a power line unit having a conductor and an optical fiber unit provided adjacent to the power line unit and having at least one optical fiber,

Applying a voltage to a conductor of the power line unit;

Injecting monitoring light into the optical fiber unit and detecting the scattered monitoring light to detect an acoustic signal generated by the power line unit;

Analyzing the waveform of the scattered monitoring light to determine whether the power line unit has a failure; And

And detecting the failure location when the failure is determined to occur.
The method of claim 10,

And setting a voltage initial value supplied to the conductor of the power line unit.
The method of claim 11,

And if it is determined that the failure does not occur, increasing the voltage applied to the conductor of the power line unit in a predetermined unit.
The method of claim 10,

The step of applying a voltage to the conductor of the power line unit

And a voltage having a predetermined pattern is supplied to the conductor of the power line unit.
The method of claim 13,

The step of applying a voltage to the conductor of the power line unit

A method for monitoring a failure of an opto-optic cable assembly, characterized in that an intermittent supply of a waveform corresponding to a second voltage value having a relatively larger value than a first predetermined voltage value is performed.
The method of claim 10,

Determining whether or not the failure occurs

And analyzing the waveform of the received monitoring light to determine whether a failure occurs.
The method of claim 15,

And monitoring light having a relatively narrow band of wavelengths into said optical fiber.
The method of claim 16,

Determining whether or not the failure occurs

And detecting a change in intensity due to a phase change of the received monitoring light and determining that the failure has occurred when the change in intensity is greater than or equal to a predetermined reference value.
The method of claim 10,

In the case of installing the opto-optic cable assembly further comprises the step of storing in advance the distance information showing the relative relationship between the distance of the photoelectric cable assembly and the distance of the optical fiber unit,

And detecting the distance determined by the optical fiber unit to the distance of the photoelectric cable assembly according to the distance information when detecting the location of the failure.
The method of claim 10,

And the optical fiber unit and the power line unit form a photoelectric composite cable.