JP4553820B2 - Optical fiber transmission loss display apparatus and method - Google Patents

Description

  The present invention relates to an apparatus and a method for displaying transmission loss of an optical fiber such as an optical fiber built in an electric wire such as OPGW.

  An optical fiber built-in overhead ground wire (hereinafter referred to as OPGW: OPtical Ground Wire) is an aluminum tube installed in the center of the overhead ground wire, and the optical fiber is accommodated in this aluminum tube. By utilizing this, it is possible to construct a long-distance and wide-capacity communication system using optical fibers. For this reason, in recent years, OPGW has been widely adopted in electric power companies and is used as an important communication line.

  A communication failure may occur in a communication line using the above OPGW. As one of the causes, for example, it is conceivable that an external force repeatedly acts on the OPGW to cause fatigue fracture in the aluminum pipe, and water that has entered the aluminum pipe from there freezes in winter. In other words, the water that has entered the aluminum tube expands due to freezing, and the transmission loss increases due to micro bending of the optical fiber caused by the local pressure on the optical fiber. It is thought that a failure will occur. In addition, communication failure of the optical fiber built in the OPGW can occur due to various causes. Also, optical cables may be installed inside underground tunnels and underground pipelines, and in that case, communication failure may occur in the optical fiber as well.

In order to identify a communication failure location of such an optical fiber, conventionally, a transmission loss of an optical fiber has been measured using a reflective failure point locator (OTDR) (Patent Documents 1, 2, etc.). OTDR is a device that measures the transmission loss characteristics of an optical fiber from the intensity of the backscattered light and the time it takes for the backscattered light to return when an optical pulse of a specific wavelength is incident on the optical fiber. A graph of measurement data is obtained with the horizontal distance as the horizontal axis and the intensity of backscattered light as the vertical axis, and the transmission loss is obtained from the slope of the graph. Then, it can be determined that an abnormality has occurred in the optical fiber at a location where the determined transmission loss is greater than the normal value.
JP 2004-138506 A JP-A-2005-84041

  By the way, the OPGW which is an overhead ground wire is supported by an electric work such as a steel tower or a utility pole. Also, in the case of underground optical cables, connection facilities such as closures are provided at appropriate intervals along the optical cables. And the maintenance check of an electric wire is performed for the section on the basis of these electric wire paths (or communication line equipment) as a unit. For this reason, it is necessary to be able to determine in which section where the abnormality of the optical fiber built in the overhead ground wire or the optical cable has occurred by the electric line (or communication line equipment) from the measurement result by OTDR.

  On the other hand, as described above, in OTDR, since the relationship between the distance along the optical fiber and the transmission loss is only required, even if it can be determined that an abnormality has occurred at the location where the transmission loss has increased, It is not possible to specify between which equipment the abnormal part exists. Therefore, using the equipment distance information that indicates the position of the distance on the electric line (or communication line equipment), the equipment distance information is compared with the location where the abnormality is detected by the OTDR to identify the section. It is possible. However, the above-mentioned facility distance information is usually provided as information on the length of the electric wire from the contractor when constructing the electric wire, but this information is not always accurate. In addition, in the case of an overhead ground wire, even if the position of the steel tower is accurately known, since the electric wire is installed in a slack state between the power transmission facilities, the position of the steel tower does not correspond to the distance along the electric wire. For these reasons, it is difficult to accurately specify the abnormality occurrence section only by using the equipment distance information as described above.

  The present invention has been made in view of the above points, so that it is possible to accurately determine in which section the optical fiber or underground optical cable built in the overhead ground wire is separated by the electrical equipment. The purpose is to display transmission loss measurement data.

To achieve the above object, the present invention displays data obtained by measuring the transmission loss of an optical fiber combined with an overhead wire by a transmission loss measuring device having a function of measuring the distance distribution of the transmission loss of the optical fiber. A device,
For each overhead wire support facilities located in towers or utility poles, facility identification information and the distance information indicating at least one of the distance between the overhead wire support facility distance and adjacent from a predetermined reference position is recorded Rutotomoni, wherein A facility database in which wire information about the wires supported by the wire support facility is recorded ;
A measurement data acquisition unit for acquiring measurement data by the transmission loss measurement device;
Based on the acquired measurement data, an optical fiber connection location, a connection location determination unit that determines the distance from the measurement location by the transmission loss measurement device,
An optical fiber connection which is an overhead wire support facility to which the optical fiber is connected by collating the distance information about each overhead wire support facility recorded in the facility database with the determined optical fiber connection location. A connected equipment judging unit for judging equipment;
Overlaying the display of the measurement data, generating a display screen displaying the equipment identification information of the determined optical fiber connection equipment at a position corresponding to the corresponding optical fiber connection location, and referring to the equipment database , Acquiring wire information about the wire supported by the determined optical fiber connection facility, superimposing the wire information on the display screen, and identifying information of the two optical fiber connection facilities supporting both sides of the wire And a data display unit for displaying at a position between the display positions .

According to the present invention, by comparing the optical fiber connection location determined based on the measurement data of the transmission loss and the distance information of the overhead wire support facility, the overhead wire support facility to which the optical fiber is connected (optical fiber) Connection equipment) can be accurately determined. Then, by displaying the determined optical fiber connection equipment superimposed on the transmission loss measurement data, when the abnormality of the optical fiber is determined by visual inspection of the measurement data, the abnormality is detected in the electric line (or communication line equipment). It is possible to easily determine which section is divided.
Moreover, since the electric wire information acquired with reference to the equipment database is superimposed on the display screen, it is displayed at a position between the display positions of the identification information of the two optical fiber connection equipment supporting both sides of the electric wire. By simply looking at the screen, it is possible to grasp information about the electric wire in the section where the abnormality has occurred.

  In the present invention, the connection location determination unit may determine, based on the measurement data, a location where a transmission loss of a predetermined unit distance is a predetermined reference value or more as an optical fiber connection location. . Alternatively, when the transmission loss measuring device has a function of determining the optical fiber connection location and outputs the connection location information indicating the determined optical fiber connection location in the measurement data, the connection location determination unit is The connection location of the optical fiber may be determined according to the connection location information.

  Moreover, the said connection equipment determination part is good also as determining the electric wire support equipment nearest to the optical fiber connection location determined by the said connection location determination part as the said optical fiber connection equipment, In this case, the said connection equipment determination When the distance between the optical fiber connection location determined by the connection location determination unit and the closest wire support facility is equal to or less than a predetermined value, the wire support facility is used as the optical fiber connection facility. It may be determined.

  In the present invention, the transmission loss measuring device is typically a reflective failure point locator (OTDR).

  According to the present invention, the transmission loss measurement data is displayed in a manner in which it is possible to accurately determine in which section the optical fiber or underground optical cable built in the overhead ground wire has occurred is separated by the electric line. be able to.

Hereinafter, preferred embodiments of the present invention will be described.
FIG. 1 is an overall system configuration diagram including an optical fiber transmission loss display device 10 (hereinafter abbreviated as a transmission loss display device) according to an embodiment of the present invention. As shown in the figure, a reflection type failure point locator (OTDR) 30 is connected to the transmission loss display device. The OTDR 30 has a function of measuring a distance distribution of transmission loss of an optical fiber based on the intensity of the backscattered light and the time until the backscattered light returns after an optical pulse having a specific wavelength is incident on the optical fiber. It is a device.

  FIG. 2 shows a state in which an abnormal portion of an optical fiber built in the OPGW 50 is determined by the OTDR 30 in the steel tower that supports the power transmission line. As shown in the figure, a connection box 54 for connecting the OPGW 50 is installed on the steel tower 52, and the optical fiber of the OPGW 50 is connected to the optical fiber of the OPGW 50 via the extension fiber 56 using the connection box 54. A failure point locator (OTDR) 30 is connected. Then, the transmission loss is measured by making light of a predetermined wavelength band incident on the optical fiber of the OPGW 50 by the OTDR 30. As will be described later, in this embodiment, the location where the transmission loss increases rapidly is determined as the optical fiber connection location, but depending on the wavelength used, the transmission loss also increases suddenly due to bending of the optical fiber, There is a possibility of misjudging the optical fiber connection location. Therefore, in order to reduce the risk of such erroneous determination, it is preferable to use light in the 1.55 μm band or 1.31 μm band, where the degree of increase in transmission loss due to bending of the optical fiber is small.

  FIG. 3 shows an example of a measurement result of transmission loss by the OTDR 30. In FIG. 3, the horizontal axis indicates the distance along the length direction of the optical fiber, the vertical axis indicates the amount of light attenuation, and the slope of the graph indicates the transmission loss. Thus, according to the OTDR 30, the distribution of transmission loss along the length direction of the optical fiber can be obtained from the measurement result. The transmission loss measurement data by the OTDR 30 as illustrated in FIG. 3 is transmitted to the transmission loss display device 10 through an appropriate communication interface. In FIG. 3, circles are marked at locations where transmission loss increases rapidly, and this location is determined as an optical fiber connection location, as will be described later.

  Further, as shown in FIG. 1, an equipment database 40 is connected to the transmission loss display device 10. As will be described below, facility data relating to electrical facilities such as power transmission towers and transmission lines is stored in the facility database 40, and the transmission loss display device 10 refers to the facility database 40 and refers to those facilities. Data can be acquired.

  FIG. 4 shows a configuration example of the facility data stored in the facility database 40. As shown in the figure, the equipment database 40 includes a tower number 401 of each tower, a length (section distance) 402 of a section divided by adjacent towers, and a cumulative distance 403 that is a cumulative section distance from the substation. The electric wire manufacturer 404, electric wire construction date 405, electric wire contractor 406, etc. are stored in each section.

  Referring again to FIG. 1, the transmission loss display device 10 includes functional units of a measurement data acquisition unit 20, a connection location determination unit 22, a measurement location input unit 24, a connection facility determination unit 26, and a data display unit 28. Yes. The transmission loss display device is configured by a computer, and the functional units 20 to 30 are realized by the computer executing a program.

  The measurement data acquisition unit 20 acquires transmission loss measurement data sent from the OTDR 30.

  Based on the transmission loss measurement data acquired by the measurement data acquisition unit 20, the connection location determination unit 22 determines a location where the transmission loss of the unit distance exceeds a predetermined value as a connection location of the optical fiber. That is, in general, optical fibers are connected by fusion, but a steep increase in attenuation of about 0.2 to 0.5 dB occurs at the connection location. Such an increase in attenuation hardly occurs except at the connection point. Therefore, the connection location determination unit 22 determines that a location where the transmission loss amount of a unit distance (for example, a relatively short appropriate distance such as 1 m) exceeds a predetermined reference value is an optical fiber connection location. Note that the measurement data of the transmission loss by the OTDR 30 is obtained as a relationship between the distance from the measurement position by the OTDR 30 (hereinafter referred to as the OTDR measurement position) and the transmission loss. , Is given as a distance from the OTDR measurement position.

  The measurement location input unit 24 receives input of information indicating the OTDR measurement position. Normally, the OTDR 30 is connected to a power generation / substation that is a base point of a transmission line, and in that case, the power generation / substation is input as a measurement point. In addition, when the distance from the power generation / substation to the measurement target location of transmission loss is long, the measurement is performed by connecting the OTDR 30 with any steel tower as shown in FIG. The tower number is entered.

  The connection facility determination unit 26 refers to the facility database 40 and determines a tower (hereinafter referred to as an optical fiber connection tower) corresponding to the connection point of the optical fiber determined by the connection point determination unit 22. That is, since the connection of the optical fiber of OPGW is always performed in any steel tower, the steel tower to which the optical fiber is connected is determined as the optical fiber connection steel tower. As described above, since the connection location determination unit 22 determines the optical fiber connection location as a distance from the OTDR measurement position, the connection facility determination unit 26 determines the section distance 402 of each steel tower stored in the facility database 40 or cumulative. The distance from the OTDR measurement position of each steel tower is obtained with reference to the distance 403, and it is determined that this steel tower closest to the optical fiber connection location determined by the connection location determination unit 22 is an optical fiber connection steel tower. To do. However, the amount of attenuation may increase abruptly due to bending of the optical fiber, etc., at locations other than the optical fiber connection location, and as a result, the connection location determination unit 22 may erroneously determine the optical fiber connection location. . Therefore, in this embodiment, when the distance between the optical fiber connection location determined by the connection location determination unit 22 and the steel tower closest thereto exceeds a predetermined value, there is no steel tower corresponding to the optical fiber connection location. Therefore, the optical fiber connection tower is not determined because the optical fiber connection location is erroneously determined.

  The data display unit 28 displays the tower number of the optical fiber connection tower determined by the connection facility determination unit 26 on the screen so as to be superimposed on the corresponding optical fiber connection position on the transmission loss measurement data. Information on the electric wires supported by the optical fiber connection tower is read from the database 40 and displayed on the screen.

  FIG. 5 shows an example of a display screen by the data display unit 28. In the example of the figure, the tower number No. of the optical fiber connection tower is added to the transmission loss measurement data. 10 and no. 13 is displayed superimposed on the positions corresponding to these towers. Furthermore, the OTDR measurement position and No. No. 10 tower and no. No. 10 tower and No. 10 Electric wire information such as the manufacturer, electric wire manufacturing date, section distance, and cumulative distance between the 13 towers is displayed in a horizontal scale at the position corresponding to each tower number displayed on the measurement data. Has been. That is, in the example of FIG. No. 10 tower and No. 10 The information regarding the transmission line between the 13 towers is No. on the transmission loss measurement data. No. 10 tower and No. 10 It is displayed at a position between 13 steel towers. For this reason, when an abnormal part is visually determined from the measurement data shown in FIG. 5, information on the electric wire including the abnormal part (in the example of FIG. 5, the electric wire manufacturer, the electric wire manufacturing date, the electric wire construction date, , The contractor) can be grasped immediately.

FIG. 6 is a flowchart showing the flow of processing in the present embodiment. As shown in the figure, first, the transmission loss of the optical fiber built in the OPGW 50 is measured by the OTDR 30 (S100).
Next, the measurement data acquisition unit 20 of the transmission loss display apparatus 10 acquires the transmission loss measurement data sent from the OPGW 50 (S102).
Next, the connection location determination unit 22 analyzes the measurement data, extracts a location where the transmission loss amount of the unit distance increases by an amount exceeding a predetermined reference value, and determines that location as an optical fiber connection location ( S104).

  Next, the connected equipment determination unit 26 calculates the distance from the OTDR measurement position of each tower with reference to the equipment database 40 based on the information indicating the OTDR measurement position input by the measurement location input unit 24 (S106). ). And the steel tower nearest to the optical fiber connection location (indicated by the distance from the OTDR measurement position) determined by the connection location determination unit 22 in S104 is extracted, and the distance between the steel tower and the optical fiber connection location is It is determined whether or not it is equal to or less than a predetermined value (S108). As for the predetermined value, for example, referring to the section distance 402 or the cumulative distance 403 of the equipment database 40, the cumulative distance from the base point is obtained for the extracted steel tower, and a predetermined ratio (for example, 30) %). As a result, if it is determined that the distance is equal to or less than the predetermined value, the steel tower closest to the optical fiber connection location is determined as the optical fiber connection steel tower (S110). On the other hand, if the distance exceeds the predetermined value, it is determined that there is no steel tower corresponding to the optical fiber connection location, that is, the erroneous determination is made by the connection location determination unit 22, and this optical fiber connection location corresponds. The optical fiber connection tower is not judged.

  In addition, since an optical fiber is normally connected in multiple places, the optical cable connection location which the connection location determination part 22 determines also becomes multiple. The processing of S106 to S110 is executed for each of the plurality of optical cable connection locations.

  Next, the data display unit 28 superimposes the tower number of the optical fiber connection tower determined by the connection facility determination unit 26 on the transmission loss measurement data acquired by the measurement data acquisition unit 20 at the corresponding position. It is displayed (S112). Furthermore, the information regarding the electric wire supported by the displayed optical fiber connection tower is read from the equipment database 40 and displayed at a corresponding position (for example, information on the transmission line supported between the tower A and the tower B is And displaying between the display position of the tower A and the display position of the tower B; S114), thereby generating a display screen as illustrated in FIG.

  As described above, according to the present embodiment, the optical fiber connection location is determined based on the transmission loss measurement data by the OTDR 30, and the optical fiber connection location is compared with the distance information of each tower. The optical fiber connection tower can be accurately determined. Then, a display screen as illustrated in FIG. 5 can be generated by superimposing the tower number of the determined optical fiber connection tower on the OTDR measurement data. The person in charge of the electric wire visually checks the measurement data obtained by OTDR and determines the location where the inclination of the graph is large as the abnormal location of OPGW. At that time, the tower number is displayed superimposed on the measurement data. , It is possible to grasp at a glance which steel tower the abnormality of OPGW has occurred. Thereby, the abnormal location determination of OPGW can be performed more accurately and efficiently, and as a result, the maintenance management work of the electric wire can be performed smoothly.

  In addition, the OTDR can select a measurement range (distance range for measuring transmission loss), but the measurement distance resolution decreases as the measurement range increases. On the other hand, according to the present embodiment, as described above, it is possible to immediately determine which steel tower the abnormality of OPGW has occurred. For this reason, first install the OTDR in the substation that is the base point of the transmission line, perform measurement in a large range, and find out which steel tower is abnormal, then next By measuring in a narrow range from the steel tower, it is possible to determine an abnormal location with high distance resolution. Thus, according to this embodiment, the effect that the abnormal part of OPGW can be determined efficiently and with high accuracy is also acquired.

  Furthermore, as described above, since information such as the manufacturer and construction date of the electric wire is displayed superimposed on the measurement data obtained by OTDR, when the abnormal part is visually determined from the measurement data, the abnormal part is displayed. It is possible to immediately grasp the information on the electric wire including the.

  In the above embodiment, the case of displaying the transmission loss of the optical fiber built in the OPGW, which is an overhead ground wire, has been described, but the present invention is not limited to this, and the underground tunnel or the underground The same can be applied to the underground optical cable provided inside the pipe. In the case of underground optical cables, optical fibers are connected by connection equipment such as a cave or a closure inside a pipe. Therefore, in the equipment database 40, equipment data such as closure identification information and distance is stored instead of the steel tower in the above embodiment, and the same as in the above embodiment, the place where the attenuation increases rapidly is the most. A close closure may be determined as an optical fiber connection facility, and the identification information of the closure may be displayed superimposed on the transmission loss measurement data.

  Moreover, in the said embodiment, the optical fiber connection location shall be determined by calculating | requiring the location where attenuation amount increases rapidly based on the measurement data of transmission loss. However, the OTDR itself may have a function of determining the optical fiber connection location. In this case, data indicating the optical fiber connection location determined by the OTDR is transmitted to the transmission loss display device as a part of the measurement data. The connection location determination unit 22 may determine the optical fiber connection location according to the data.

1 is an overall system configuration diagram including an optical fiber transmission loss display device according to an embodiment of the present invention. It is a figure which shows a mode that the abnormal location of the optical fiber incorporated in OPGW is determined by OTDR. It is a figure which shows the example of the measurement result of the transmission loss by OTDR. It is a figure which shows the structural example of the equipment data stored in the equipment database in this embodiment. It is a figure which shows an example of the display screen by the data display part in this embodiment. It is a flowchart which shows the flow of the process in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Transmission loss display apparatus 20 Measurement data acquisition part 22 Connection location determination part 24 Measurement location input part 26 Connection equipment determination part 28 Data display part 30 OTDR
40 Equipment database 401 Tower number 402 Section distance 403 Cumulative distance 404 Electric wire manufacturer 405 Installation date 406 Contractor 50 OPGW
52 steel tower

Claims (8)

An apparatus for displaying data obtained by measuring transmission loss of an optical fiber combined with an overhead wire by a transmission loss measuring apparatus having a function of measuring a distance distribution of transmission loss of the optical fiber,
For each overhead wire support facilities located in towers or utility poles, facility identification information and the distance information indicating at least one of the distance between the overhead wire support facility distance and adjacent from a predetermined reference position is recorded Rutotomoni, wherein A facility database in which wire information about the wires supported by the wire support facility is recorded ;
A measurement data acquisition unit for acquiring measurement data by the transmission loss measurement device;
Based on the acquired measurement data, an optical fiber connection location, a connection location determination unit that determines the distance from the measurement location by the transmission loss measurement device,
An optical fiber connection which is an overhead wire support facility to which the optical fiber is connected by collating the distance information about each overhead wire support facility recorded in the facility database with the determined optical fiber connection location. A connected equipment judging unit for judging equipment;
Overlaying the display of the measurement data, generating a display screen displaying the equipment identification information of the determined optical fiber connection equipment at a position corresponding to the corresponding optical fiber connection location, and referring to the equipment database , Acquiring wire information on the wire supported by the determined optical fiber connection facility, superimposing the wire information on the display screen, and identifying information of the two optical fiber connection facilities supporting both sides of the wire An optical fiber transmission loss display device, comprising: a data display unit configured to display at a position between display positions . The connection point determination unit is based on said measurement data, the transmission loss of the predetermined unit distance according to claim 1, wherein determining that an optical fiber connection point a point is equal to or more than a predetermined reference value Optical fiber transmission loss display device. The transmission loss measuring device has a function of determining an optical fiber connection location, and outputs the connection location information indicating the determined optical fiber connection location in the measurement data,
The connection point determination unit, the transmission loss display device of the optical fiber according to claim 1, wherein determining the connection point of the optical fiber according to the connection point information. The connection facility determining section, the nearest power line support facilities to the optical fiber connection points, which is determined by the connecting point determination unit, any one of the preceding claims, characterized in that the determination as the optical fiber connection facilities 2. An optical fiber transmission loss display device according to item 1. When the distance between the optical fiber connection point determined by the connection point determination unit and the closest wire support facility is equal to or less than a predetermined value, the connection facility determination unit 5. The optical fiber transmission loss display device according to claim 4, wherein it is determined as a fiber connection facility. The said electric wire information contains the information showing at least any one of the manufacture date of an electric wire, the maker of an electric wire, the construction date of an electric wire, and the contractor of an electric wire, Any one of Claims 1-5 characterized by the above-mentioned. transmission loss display device of the optical fiber of one of claims. The optical transmission loss display device according to any one of claims 1 to 6 , wherein the transmission loss measuring device is a reflection type failure point locator (OTDR). A method for displaying data obtained by measuring transmission loss of an optical fiber combined with an overhead wire by a transmission loss measuring device having a function of measuring a distance distribution of transmission loss of the optical fiber, wherein the computer includes:
Obtaining measurement data by the transmission loss measuring device;
Based on the acquired measurement data, determining an optical fiber connection location as a distance from a measurement position by the transmission loss measurement device;
For each electric wire supporting facilities located in towers or utility poles, facility identification information and the distance information indicating at least one of the distance between the wire support equipment distance and adjacent from a predetermined reference position is recorded Rutotomoni, the wire support The optical fiber is connected by referring to the equipment database in which the electric wire information related to the electric wires supported by the equipment is recorded , and comparing the distance information about each electric wire supporting equipment with the determined optical fiber connection location. Determining an optical fiber connection facility that is an electrical wire support facility, and referring to the facility database to obtain electrical wire information related to an electrical wire supported by the determined optical fiber connection facility ; and
The equipment identification information of the determined optical fiber connection equipment is displayed at a position corresponding to the corresponding optical fiber connection place , superimposed on the transmission loss data display, and the acquired wire information is displayed on both sides of the wire. Generating a display screen displayed at a position between the display positions of the identification information of the two optical fiber connection facilities that support the optical fiber, and a method for displaying an optical fiber transmission loss.

Images