JPH10177055A - Accident detection position locating system for overhead transmission lines - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an accident detection position locating system for an overhead transmission line, which has a simple configuration and can greatly reduce labor and time for locating an accident occurrence position. SOLUTION: The main orientation of the end of the OPGW 4 is based on a change in the state of two sets of propagation light of an optical fiber core 8 combined with the OPGW 4 generated by a mechanical shock applied from the outside of the OPGW 4 at a steel tower 5 detecting an accident. Since the tower 5 to which the impact was applied can be detected by the device 1 and subjected to the signal processing,
A simple system can be configured without pulling out the optical fiber core 8 from the PGW 4. In addition, since the accident information can be managed collectively by the light receiving / signal processing unit, no labor or time is required to confirm the accident detection position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accident detection position locating system for locating an accident occurrence position of an overhead transmission line.

[0002]

2. Description of the Related Art When a lightning strike or disconnection accident occurs on a high-voltage line or a tower for transmitting high voltage, it is necessary to find and repair the place where the accident occurred. There are various ways to find this type of accident.

[0003] For example, an accident detection sensor is installed on a steel tower in advance, and when an accident occurs, a mark such as a flag is provided so that the result of the accident detection can be observed from under the steel tower. There is a method to identify the tower where the fault current occurred by checking

[0004] Further, an optical fiber core wire composited with an OPGW (optical fiber composite overhead ground wire) is drawn out from the OPGW, and an output of the accident detection sensor is applied to the drawn-out portion to apply bending. There is also a method in which a loss occurring in the optical fiber core due to bending is detected by an OTDR connected to the terminal of the OPGW, and an accident detection tower is specified.

[0005] Furthermore, an information transmission device is installed in the tower, and a signal from a current sensor or the like is transmitted to a monitoring station, and the monitoring station specifies the location where the accident has occurred based on the information, so that the transmission line route can be determined. There is also a method of locating the accident occurrence section of the above.

On the other hand, a distributed waveguide sensor for determining the position of occurrence of a physical phenomenon applied to an arbitrary position of an optical fiber by using one or a pair of optical fibers having one end connected to each other as a sensor is disclosed in Japanese Patent Application Laid-Open No. HEI 9-163,086. No. 6,307,896, which discloses an optical fiber combined with an OPGW as a waveguide of the distributed waveguide sensor, to reduce the polarization fluctuation of the optical fiber propagation light due to a current flowing through the OPGW due to a lightning strike. It is conceivable to measure the time change and to locate the lightning strike to the OPGW.

[0007]

However, the above-mentioned prior art has the following problems.

[0008] A method of installing an accident detection sensor on a steel tower and displaying a mark such as a flag for observing the result of the accident detection from beneath the tower, and a patrol member confirming the mark from the ground to specify a steel tower in which an accident current has occurred is disclosed. , To check the tower where the accident occurred
It had to go along the overhead transmission line route, which required a great deal of labor and time.

In addition, in the method of receiving the output of the accident detection sensor and applying a bend to a portion where the optical fiber core combined with the OPGW is drawn out from the OPGW, and generating a loss in the optical fiber core by the bending, In order to apply a bend to the fiber core, the optical fiber core must be drawn from the OPGW for each tower, which is troublesome.

[0010] Further, in the method of installing the information transmission device on a steel tower, it is necessary to secure a power supply used for the information transmission device, and the system becomes complicated.

Furthermore, a distributed waveguide sensor for determining the position of occurrence of a physical phenomenon applied to an arbitrary position of an optical fiber using one or a pair of optical fibers having one end connected to each other as a sensor is applied. In this case, the location of the lightning strike can be located, but there is a problem that a lightning strike current flowing through the OPGW is small or an accident in which no current flows through the OPGW other than the lightning strike cannot be detected.

Accordingly, an object of the present invention is to provide an accident detection position locating system for an overhead transmission line, which solves the above-mentioned problems, has a simple structure, and can greatly reduce the labor and time required for locating an accident occurrence position. Is to do.

[0013]

In order to achieve the above object, the present invention relates to an accident detection position locating system for locating an accident occurring on an overhead power transmission line having an OPGW. When an accident detector provided on the tower supporting the overhead power transmission line detects an accident, a mechanical shock or vibration is applied to the OPGW by the shock / vibration applying device, and the state change of the propagation light of the optical fiber is monitored. The detection is performed to detect an accident, and the position where an impact or vibration is applied to the OPGW is located to determine an accident detection position.

According to the present invention, in addition to the above configuration, the accident detector comprises:
A predetermined time interval may be provided between the detection of an accident and the application of shock or vibration to the OPGW.

In addition to the above configuration, in the present invention, a predetermined time interval from when the accident detector detects an accident to when an impact or vibration is applied to the OPGW may be set to a different value for each accident detector. .

In addition to the above configuration, in the present invention, the lightning strike position may be determined by detecting a time change of the polarization state of the propagation light of the optical fiber combined with the OPGW by the lightning strike current flowing through the OPGW. .

According to the present invention, in addition to the above configuration, the waveform judging unit used for locating the shock / vibration applying position detects a time change of the polarization state of the propagating light of the OPGW composite optical fiber, which changes due to the lightning current flowing through the OPGW. It may be a waveform determination unit used for locating a lightning strike position by detecting.

In addition to the above configuration, the present invention may be configured to locate an accident or a lightning strike location by detecting a time change in the state of the propagation light in the OPGW composite optical fiber.

That is, according to the present invention, an accident current or the like is detected by a sensor section installed in a steel tower section, an output of the sensor section is received, and an impact or vibration is applied to the OPGW, whereby an OGW is applied.
Using a light source connected to one end of the optical fiber and a light receiving / signal processing unit connected to the other end of the optical fiber, a time change is generated in the state of propagation light of the optical fiber combined with the PGW,
The time change of the state of the light propagating through the optical fiber is measured, and the position where the shock or vibration is applied to the OPGW is specified based on this information.

Further, according to the present invention, an optical fiber and a light receiving / signal processing unit to be used are controlled by a lightning current flowing through the OPGW.
By detecting the time change of the polarization state of the optical fiber combined with the PGW, the optical fiber used for locating the lightning strike and the same as the optical fiber and the light receiving / signal processing unit can be used. The system is provided with two functions, that is, the location of an accident detection position and the location of a lightning strike.

According to the above configuration, two sets of state changes of the propagating light of the OPGW composite optical fiber generated by the shock or vibration applied from outside of the OPGW at the steel tower where the accident is detected can be measured.
It can be detected at the end of the PGW, and the tower to which the shock or vibration has been applied can be specified by signal processing. For this reason, a simple system can be configured without extracting the optical fiber from the OPGW, and accident information can be collectively managed by the light receiving / signal processing unit, so that no labor or time is required to confirm the accident detection position. .

[0022]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

The present embodiment detects a lightning strike position or an accident detection position by detecting a temporal change in the state of the propagation light of the optical fiber combined with the OPGW. System.

First, a system for locating an accident detection position will be described.

FIG. 1 is an overall configuration diagram of an embodiment of an overhead transmission line accident detection position locating system according to the present invention.

In FIG. 1, the steel towers 5 (5a, 5b,.
z) OPGW4 laid on the top of the transmission line (the main line for energizing the transmission line is not shown) laid through
A plurality of optical fibers are compounded inside the (optical fiber compound overhead ground wire). One end of one of the optical fibers (single mode optical fiber) is connected to the main orientation device 1, and the other end of the optical fiber is connected to the sub orientation device 2.

On the other hand, each of the towers 5a, 5b,
…, 5z shock / vibration applying device (hereinafter “shock applying device”)
That. ) (7a, 7b,..., 7z) are attached. The impact applying devices 7a, 7b,..., 7z are provided with the steel towers 5a, 5b,.
The accident detection device 6 (6a, 6b,
, 6z), the accident detection device 6
In response to the outputs of a, 6b,..., 6z, an impact is applied to the OPGW 4. Accident detection devices 6a, 6
b,..., 6z detect an accident based on the same principle as an accident detection sensor that operates with an accident current conventionally used,
When an accident is detected, the impact applying device 7 (7a, 7b,.
7z) having a mechanism for sending a detection output is used.

The impact applying devices 7a, 7b,..., 7z receive the accident detection output via the accident detection signal transmission line 9 and apply a mechanical shock vibration to the OPGW 4 with a shape such as a hammer (FIG. 2). reference). The faster the time change of the shock waveform applied to the OPGW 4 is, the higher the position locating accuracy by the measuring method described later is. FIG. 2 is a diagram showing the positional relationship between the accident detection device and the impact applying device provided on the steel tower shown in FIG.

Hereinafter, the shock applying devices 7a, 7b,.
Detects the propagation light of the optical fiber in the OPGW 4 when an impact is applied to the OPGW 4, thereby detecting the main orientation device 1.
The method of locating the tower (accident-causing tower) to which the impact was applied in the above will be described with reference to FIG. FIG. 3 is a block diagram of the main orientation device and the secondary orientation device shown in FIG. FIG.
(A) and FIG. 4 (b) show O / O of the main orientation device shown in FIG.
FIG. 4 (c) shows an output waveform of the E converter, and FIG. 4 (c) shows a composite waveform of both O / E converters. FIG. 4D and FIG. 4E show FIG.
FIG. 7 is an output waveform of the O / E converter of the sub-orientation device shown in FIG.
FIG. 4F shows a composite waveform of both O / E converters. FIG.
4A to 4F, the horizontal axis is a time axis, and the vertical axis is an intensity axis.

A main orientation device 1 is connected to one end of one optical fiber core 8 combined in the OPGW 4 shown in FIG. 1, and a sub orientation device 2 is connected to the other end of the optical fiber core 8. It is connected. The configuration and basic operation of the measurement system shown in FIG. 3 will be described below.

In the main orientation device 1, the light source 11 performs a continuous light emission operation at a wavelength of λ1 with a linearly polarized output, and the emitted light is transmitted to a single mode through an optical directional coupler 15 and an optical demultiplexer 16. Is input from one end (the left side in the figure) of the optical fiber core wire 8 and is emitted from the other end (the right side in the figure) of the optical fiber core wire 8 to the sub-orienting device 2. In the sub-orienting device 2, the light from the main orientation device 1 reaches the polarization beam splitter 24 via the optical demultiplexer 26 and the optical directional coupler 25. In the polarization beam splitter 24, the incident light is divided into P-polarized light and S-polarized light whose polarization axes are orthogonal to each other, and the O / E converter 22 and the O / E converter 2 respectively.
3 and is converted into an electric signal (FIG. 4 (d),
(E)).

On the other hand, in the sub-orienting device 2, the light source 21
A continuous light emission operation of the wavelength λ1 is performed with a linearly polarized wave output. The light emitted from the light source 21 is incident on the other end of the optical fiber core 8 via the optical directional coupler 25 and the optical demultiplexer 26,
The optical fiber 8 is emitted from one end to the main orientation device 1. The light emitted from the sub-orientation device 2 reaches the polarization beam splitter 14 via the optical demultiplexer 16 and the optical directional coupler 15. In the polarization beam splitter 14, the incident light is divided into P-polarized light and S-polarized light whose polarization axes are orthogonal to each other (FIGS. 4A and 4B), and the O / E converter 12 and the O / E converter, respectively. 13 and is converted into an electric signal. Normally, since the outputs of the light sources 11 and 21 are constant, the outputs of the O / E converters 12, 13, 22, and 23 are temporally constant. 32 is an O / E converter,
Reference numeral 34 denotes a display device for displaying the occurrence and location of an accident.

The object of the present invention can be achieved by using an optical circulator instead of the optical directional couplers 15 and 25. The optical circulator is, for example, 3 of A, B, and C.
When terminals are provided, light incident on each terminal is output as A → B, B → C and C → A. Optical circulators are more expensive than optical directional couplers, but have the characteristic of low insertion loss.

The wavelength of the light source 21 is changed to the wavelength λ of the light source 11.
1 and λ3 different from the wavelength λ2 of the light source 31, the optical directional couplers 15 and 25 are optical demultiplexers for demultiplexing the wavelengths λ1 and λ3, and the optical demultiplexers 16 and 26 are wavelength λ1 and λ3. The object of the present invention can also be achieved by a configuration having a terminal that selectively transmits light and a terminal that selectively transmits wavelength λ2. Although it is necessary to use light sources of two wavelengths for signal detection, using an optical demultiplexer is advantageous in that the insertion loss is smaller than using an optical directional coupler.

Hereinafter, a method for locating a tower in which an accident has been detected will be described.

For example, a steel tower 5b at a distance of Lx from the main orientation device 1 (a distance from the main orientation device 1 to the steel tower 5b,
The length of the optical fiber combined with the OPGW 4 in this section is strictly different, but the relationship between these lengths can be made to correspond if the design values such as the structure of the OPGW 4 used are known. Here, description will be made assuming that they are the same. If the accident detecting device 6b) detects an accident and applies an impact to the OPGW 4 by the impact applying device 7b at time t0,
The polarization state of the light emitted from the light source 11 propagating through the optical fiber core 8 combined in the OPGW 4 is disturbed by the impact.

That is, although the polarization axis is oriented in a fixed direction, the polarization axis rotates and the phase changes according to the shock waveform. This change in the polarization state is caused by the speed of light c (about 2 × 10
⁸ m / sec). Therefore, the impact applying device 7b
O / E in the sub-orientation device 2 that is separated from (L0-Lx) by
The output of the converter 22 and the output of the O / E converter 23 change with a waveform corresponding to the shock applied by the shock applying device 7b at a time later than the time t0 by a time t2 represented by the equation (1).

Similarly, the polarization state of the light emitted from the light source 21 is also disturbed by the impact. As a result, the O / E in the main orientation device 1
The outputs of the converter 12 and the O / E converter 13 change with a waveform corresponding to the shock applied by the shock applying device 7b at a time later than the time t0 by a time t1 represented by the equation (2).

T2 = (L0−Lx) / c (1) t1 = Lx / c (2) In the waveform determination unit 27 in the sub-locating device 2, the O / E converter 2
2 and the output S2 of the O / E converter 23.
For example, an output S2 (t) synthesized by using Equation (3) is obtained using 3 (t) (FIG. 4 (f)), and the synthesized waveform S2 is obtained.
A time when (t) exceeds a preset threshold value Vth is obtained as t2. The time information obtained by the sub-locating device 2 is transmitted to the transmission signal processing unit 30, the transmission light source 31 of the wavelength λ2, the optical demultiplexer 26, the optical fiber 8, and the main orientation device 1.
Locating unit 3 via optical demultiplexer 16 and O / E converter 32
Sent to 3.

S2 (t) = √ (S22 (t) ² + S23 (t) ² ) (3) On the other hand, in the waveform determination unit 17 in the main orientation device 1, the output S12 (t) of the O / E converter 12 ) And the output S13 (t) of the O / E converter 13 to obtain an output S1 (t) synthesized using, for example, equation (4) (FIG. 4 (c)), and this synthesized waveform S1 (t) Is a preset threshold Vth
Is determined as t1 and output to the orientation unit 33.

S1 (t) = √ (S12 (t) ² + S13 (t) ² ) (4) In the orientation unit 33, t1 and t2 are obtained by transforming the equations (1) and (2). By substituting into the equation (5), the position Lx where the detected polarization fluctuation has occurred is obtained.

Lx = (c × (t1−t2) + L0) / 2 (5) Whether the detected waveform is due to the impact given to the OPGW 4 by the impact applying device 7 accompanying the accident detection at the steel tower 5,
Whether it is caused by a lightning strike on W4 or a factor other than an accident due to a temperature change or the like can be determined from the shape of the detected waveform. In the case of the polarization fluctuation by the shock applying device 7, as shown in FIG. 5A, the waveform has a waveform that vibrates and attenuates at substantially the same frequency.

On the other hand, in the case of a lightning strike, as shown in FIG. 5B, the waveform has a short rise time and a long fall time. 5 (a) and 5 (b) show OPGW.
FIG. 3 is a diagram showing an impact waveform applied to the hologram, in which the horizontal axis is a time axis and the vertical axis is an intensity axis.

Therefore, it can be determined from the detected waveform whether the accident is due to an accident detection or a lightning strike. The polarization state propagating in the optical fiber also changes according to the temperature change, but the temperature changes gradually in the natural state, but the lightning current and the shock waveform change instantaneously. By doing so, it can be determined whether or not it is caused by the temperature. These determinations can be realized by performing artificial intelligence processing or the like on the waveform detected by the waveform determination unit 17 of the main orientation device 1.

The above operation is the same when an accident occurs in another tower 5 and any of the towers 5a, 5b,
, 5z of the accident detection devices 6a, 6b,..., 6z detect the accident, and the impact applying devices 7a, 7b,.
Even when an impact is applied to the steel tower 4, it is possible to detect the accident and locate the steel tower 5 to which the impact is applied.

Next, a system for locating a lightning strike will be described with reference to FIGS. 5 (b), 6, 7 (a) and 7 (b). FIG. 6 is a diagram showing a state in which a lightning strike has occurred in the OPGW, FIG. 7 (a) shows a composite waveform in the main orientation device shown in FIG. 6, and FIG. 7 (b) shows a waveform shown in FIG. 4 shows a composite waveform in the sub-orienting device. 7A and 7B, the horizontal axis is the time axis, and the vertical axis is the intensity axis. Further, the configurations of the transmission line, the main orientation device 1 and the sub orientation device 2 are the same as those in FIGS. 1 and 3.

Here, from the main orientation device 1 on the OPGW 4 to L
Consider a case where a lightning strike occurs at a distance of x. The polarization state of the light of wavelength λ1 that propagates bidirectionally through the optical fiber core 8 combined in the OPGW 4 is rotated by the Faraday effect when the lightning strike current propagates through the OPGW 4 (Heisei 7). IEEJ National Convention No. 548).

Therefore, the impact applying devices 7a, 7b,.
In the same manner as the detection of the polarization fluctuation waveform due to z, the waveform determination unit 17 of the main orientation device 1 and the waveform determination unit 27 of the sub-location device 2 combine the output waveforms of the two sets of O / E converters. Waveforms S1 (t) and S2 (t) can be obtained. Waveform detection times t1 and t2 obtained from these detection waveforms,
From the waveform detected by the main orientation device 1, it is found that the detected polarization fluctuation is caused by a lightning strike. The location of the lightning strike is determined in the same way as the method used to determine the location of the lightning strike.

When an accident current that causes the operation of the accident detection devices 6a, 6b,..., 6z occurs, there is a possibility that a shunt component or an induction component of the accident current also occurs in the OPGW 4.
In this case, there is a possibility that polarization fluctuation may occur due to the current flowing through the OPGW 4, and when the accident detecting device 6 operates the shock applying devices 7a, 7b, ..., 7z immediately after detecting the accident, the shock applying device 7a , 7b,..., 7z overlap with the polarization fluctuation caused by the current flowing through the OPGW 4, and it may be difficult to determine the type of the waveform and to locate the position.
In order to avoid such a situation, the accident detection devices 6a, 6
When a predetermined time period is set between the time when b,..., 6z detects an accident and the time when the shock applying device 7 is operated, the shock is applied after the shunt component and the induced component due to the accident flowing through the OPGW 4 disappear. Reliability can be improved.

It is also conceivable that a plurality of detectors may detect an accident in one accident. In such a case, a plurality of shock applying devices apply shocks and vibrations at different positions of the OPGW 4 almost simultaneously. In some cases, it may be difficult to accurately determine which shock applying device 7 applied the shock and when.

Therefore, it is possible to further improve the reliability of the system by setting the time from when an accident is detected for each accident detector to when the shock applying device 7 is operated to a different value.

In the above embodiment, an example in which an impact is applied to the OPGW at the tower where an accident is detected has been described. However, instead of the impact, a constant frequency or vibration whose frequency changes in accordance with a predetermined rule is applied. Can also locate the tower that detected the accident. In this case, the shock applying device 7
Instead, a vibration applying device is used. In the vibration applying device, the output of the electric oscillation circuit that operates in response to the output of the accident detector is converted into mechanical vibration by a piezoelectric element or the like attached to the OPGW, and is applied to the optical fiber with the built-in OPGW. The polarization plane of the light propagating in the OPGW built-in optical fiber can be modulated by the mechanical vibration of the piezoelectric element attached to the OPGW in the same manner as when an impact is applied.

The oscillating frequency of the electric oscillating circuit may be set to a different value for each pylon, or may be changed at a frequency according to a predetermined frequency change pattern for each pylon so that the pylon can be identified. deep. As the frequency change pattern determined for each tower, for example, the frequency fn (t) of the n-th tower is changed as shown in Expression (6) by changing the frequency modulation amplitude An for each tower, or the modulation angle ωn is changed for each tower. By using the formula (7), the tower can be distinguished.

Fn (t) = f0 + An · sin (ω · t) (6) fn (t) = f0 + A · sin (ωn · t) (7) As shown in equations (6) and (7), the steel tower When the modulation frequency for each of the towers is a predetermined pattern, the resonance frequency of the vibration element such as a piezoelectric element in all the towers is different from the case where the oscillation frequency is set to a different value f0n (a constant frequency for each time) for each tower. Since the same thing can be used, it is advantageous in that the total cost can be reduced. Further, the frequency f0 which is constant over time
When n is detected as a signal, noise of the same frequency as that of the signal may be mixed in from the surroundings, and there is a risk of erroneous determination. However, the modulation frequency for each tower is determined in advance as in Equations (6) and (7). In the case of a pattern, the signal pattern changes according to a certain rule, so that the probability of causing an erroneous determination can be extremely low.

Limit the vibration application time (for example, about several seconds)
By doing so, the power supply capacity of the vibration applying device can be reduced.

The vibration applied to the OPGW by the vibration applying device is represented by O
A method of locating the tower to which the vibration is applied by the main locator by detecting from the optical fiber propagating light combined in the PGW will be described below.

On one side of one optical fiber core 8 combined in the OPGW 4 shown in FIG.
The point that the sub-orienting device 2 is connected to the other end is substantially the same as the above-described embodiments. Further, the optical systems and functions in the main orientation device 1 and the sub orientation device 2 are the same as those in the above-described embodiments. The difference from the previous embodiments is the processing method in the waveform determination unit.

When the waveform S1 (t) obtained by synthesizing the two O / E converted outputs according to the equation (4) exceeds a preset threshold value, the waveform determining section 17 obtains the time t1 and simultaneously obtains the time t1. , T1 and subsequent waveforms are analyzed by FFT (fast Fourier transform) processing or the like. By analyzing the obtained frequency value or its change pattern, it is possible to identify which tower of the accident detector has operated. In parallel with this frequency analysis process, the characteristics of the detected waveform are analyzed, and if it is determined that the detected waveform is due to lightning strike, the lightning strike is performed by performing the processing after lightning strike detection in the above-described embodiment. Location can also be performed.

In the above-described embodiment, the accident locating system has both functions of locating the accident detection position and locating the lightning strike to the OPGW 4. However, in order to reduce the cost, only one of the functions is limited. It is clear that an optimized orientation system can be constructed.

In the above-described embodiment, the light source and the light receiving / signal processing unit are connected to both ends of the OPGW composite optical fiber for detecting shock and vibration. However, the present invention is not limited to this. As shown in FIG. 9, an optical fiber folded portion 41 connected to each other at the other ends of two OPGW composite optical fibers is installed in an optical fiber termination box 40, and a light source is applied to one optical fiber in the orientation device 100. 11 to the other light source, a polarization beam splitter 14, O / E converters 12, 13
Can be used to perform the accident detection location and lightning strike location. At this time, if an optical fiber having a length Lα is inserted as an extra length at the optical fiber turn-back portion, it is easy to separate the two sets of polarization fluctuation waveforms, so that the position can be easily located. Become.
FIG. 8 is a diagram showing another embodiment of the overhead transmission line accident detection position locating system of the present invention, and FIG. 9 is a block diagram of the locating device shown in FIG.

The polarization fluctuation waveform (the O / E converter 12 and the O / E converter 12) of the optical fiber due to the shock applied by the shock applying device 7
The result of combining the output with the / E converter 13) is as shown in FIG. 10, and the vibration application position Lx can be obtained as in Expression (8). FIG. 10 is a diagram showing a composite waveform of the two O / E converters 12 and 13 of the orientation device 100 shown in FIG.
The horizontal axis indicates the time axis, and the vertical axis indicates the intensity axis.

The lightning strike position can be obtained in the same manner. This configuration has the advantage that the locating device only needs to be installed on one side of the OPGW, but if it is difficult to distinguish the two sets of fluctuating waveforms, a light source and a light receiving / signal processing unit are used at both ends of the optical fiber. Is preferred.

Lx = (c × (t1−t2) + 2 × L0 + Lα) / 2 (8) In the embodiment shown in FIGS. 8 and 9, OPGW4
Although two optical fibers are used, the same object can be achieved by using only one optical fiber. That is, as shown in FIG. 11, a light directional coupler or an optical circulator is provided at one end (incident part) of the optical fiber core 8, and light from the light source 11 is incident on the optical fiber core 8, and The light returned from the optical fiber 8 is split by the polarization beam splitter 14 via the optical directional coupler 42 or the optical circulator, and the other end of the optical fiber core 8 is connected to the optical directional coupler 43 or the optical circulator. This is possible by adopting a configuration in which propagating light returns to the optical fiber core wire 8 via an optical directional coupler or an optical circulator. This configuration has the advantage that only one optical fiber is used and the locating device only needs to be installed on one of the OPGWs 4. FIG. 11 is a diagram showing still another embodiment of the overhead transmission line accident detection position locating system of the present invention.

In the embodiments described above,
Although an example using a single mode optical fiber has been described, a multimode optical fiber may be used although there is some reduction in position measurement accuracy.

As described above, according to the present embodiment, (1) the location (confirmation) of the accident detection position can be promptly performed while staying at the monitoring station.

(2) Since the fault detection position can be located without pulling out the optical fiber from the middle of the OPGW, a system with a simple configuration can be formed.

(3) In addition to locating an accident detection position, locating a lightning strike position can be performed by the same measurement / signal processing system.

[0068]

In summary, according to the present invention, the following excellent effects are exhibited.

An optical signal is propagated in advance through the optical fiber of the OPGW, and when an accident detector provided on a steel tower supporting the OPGW detects an accident, an impact / vibration applying device applies an impact or vibration to the overhead transmission line, OPG is detected by detecting a change in the state of light propagated through the optical fiber.
Since the location where shock or vibration is applied to W is used to determine the accident detection position, the accident detection position locating of the overhead transmission line which has a simple configuration and can greatly reduce the labor and time required for locating the accident occurrence position The system can be realized.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an embodiment of an overhead transmission line accident detection position locating system according to the present invention.

FIG. 2 is a diagram showing a positional relationship between an accident detection device and an impact applying device provided on the steel tower shown in FIG.

FIG. 3 is a block diagram of a main orientation device and a secondary orientation device shown in FIG. 1;

4 (a) and 4 (b) are output waveforms of the O / E converter of the main orientation device shown in FIG. 3, and FIG. 4 (c) is a composite waveform of both O / E converters. (D) and (e) are output waveforms of the O / E converter of the sub-orienting device shown in FIG. 3, and (f) is a composite waveform of both O / E converters.

5 (a) and 5 (b) are diagrams showing an impact waveform applied to an OPGW.

FIG. 6 is a diagram showing a state in which a lightning strike has occurred in the OPGW.

7A is a diagram showing a synthesized waveform in the main orientation device shown in FIG. 6, and FIG. 7B is a diagram showing a synthesized waveform in the sub orientation device shown in FIG.

FIG. 8 is a view showing another embodiment of the overhead transmission line accident detection position locating system of the present invention.

FIG. 9 is a block diagram of the orientation device shown in FIG. 8;

FIG. 10 is a diagram showing a combined waveform of both O / E converters of the orientation device shown in FIG. 9;

FIG. 11 is a view showing still another embodiment of the overhead transmission line accident detection position locating system of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main orientation apparatus 2 Secondary orientation apparatus 4 OPGW 5,5a, 5b, ..., 5z Steel tower 6,6a, 6b, ..., 6z Accident detection apparatus 7,7a, 7b, ..., 7z Shock / vibration applying apparatus (impact applying apparatus) , Vibration applying device)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noriyasu Morishita 55-2 Okazu, Kakegawa-shi, Shizuoka Chubu Electric Power Co., Inc. Inside Kakegawa Electric Power Center (72) Inventor Yasuyuki Otani 55-2 Okazu, Kakegawa-shi, Shizuoka Chubu Electric Power Inside the Kakegawa Electric Power Center Co., Ltd. (72) Inventor Taiji Ota 55-2, Okazu, Kakegawa City, Shizuoka Prefecture Inside Chubu Electric Power Company (72) Kuniyuki Araki 55-2, Okazu, Kakegawa City, Shizuoka Prefecture Chubu Electric Power Company Inside the Kakegawa Electric Power Center (72) Eiichiro Takase 55-2 Okazu, Kakegawa City, Shizuoka Prefecture Inside Chubu Electric Power Company (72) Inventor Shigeo Nakata 55-2 Okazu, Kakegawa City, Shizuoka Prefecture Chubu Electric Power Company Kakegawa Electric Power Company Inside the center (72) Inventor Satoshi Yamamoto 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Hitachi Cable, Ltd. Toro system in the Laboratory (72) inventor Akira Nakamura Hiroyuki Hitachi City, Ibaraki Prefecture Hidaka-cho 5-chome No. 1 Hitachi Electric Cable Co., Ltd. Optoelectronic System within the Institute

Claims (6)

[Claims] 1. An accident detection position locating system for locating an accident occurring in an overhead power transmission line having an OPGW, wherein an optical signal of the OPGW is propagated in advance to an optical fiber of the OPGW, and an optical signal is transmitted to a tower supporting the overhead power transmission line. If the provided accident detector detects an accident, the shock / vibration applying device
Applying a mechanical shock or vibration to the PGW to detect an accident by detecting a change in the state of the propagation light of the optical fiber, and locating the position where the shock or vibration is applied to the OPGW to obtain an accident detection position. An accident detection position locating system for overhead power transmission lines. 2. The fault detection position locating system for an overhead transmission line according to claim 1, wherein a predetermined time interval is provided from when the fault detector detects the fault to when an impact or vibration is applied to the OPGW. 3. After the accident detector detects an accident,
3. A predetermined time interval until a shock or vibration is applied to the PGW is set to a different value for each accident detector.
The overhead transmission line accident detection position locating system described in the above. 4. A lightning strike current flowing through the OPGW causes O
The fault detection position locating system for an overhead transmission line according to any one of claims 1 to 3, wherein the position of the lightning strike is determined by detecting a time change of the polarization state of the propagation light of the optical fiber combined with the PGW. 5. A lightning strike is performed by detecting a time change of a polarization state of light propagating through an OPGW composite optical fiber, which is changed by a lightning strike current flowing through the OPGW, by a waveform judging unit used for locating a position where a shock or vibration is applied. 4. The location detection system for an overhead transmission line according to claim 1, wherein the location determination system is a waveform determination unit used for location determination. 6. The fault detection of an overhead transmission line according to claim 1, wherein the location of an accident or a lightning strike is located by detecting a time change of a state of propagation light of the OPGW composite optical fiber. Location system.