JP3386966B2 - Accident detection position locating system for overhead transmission lines - Google Patents

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 on an overhead power transmission line.

[0002]

2. Description of the Related Art When a lightning accident or a wire breakage accident occurs in a high-voltage line or a tower for transmitting high voltage, it is necessary to find the location of the accident and repair it. There are various ways to detect this type of accident.

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

Further, an optical fiber core wire which is composited with OPGW (optical fiber composite overhead ground wire) is drawn out from OPGW, and bending is applied to the extracted part by receiving the output of the accident detection sensor. There is also a method of detecting the loss generated in the optical fiber core wire by bending with an OTDR connected to the end of the OPGW to specify the accident detection tower.

Furthermore, an information transmission device is installed in the steel tower, signals of current sensors and the like are transmitted to the monitoring station, and the location of the accident is specified on the basis of the information at the monitoring station, so that the route of the power transmission line is determined. There is also a method of locating the accident occurrence section.

On the other hand, there is disclosed a distributed waveguide sensor which uses one optical fiber as a sensor or a pair of optical fibers whose one ends are connected to each other to obtain the position where a physical phenomenon is applied to an arbitrary position of the optical fiber. JP-A-6-307896, by using an optical fiber combined with OPGW as a waveguide of this distributed waveguide sensor, polarization fluctuation of optical fiber propagating light due to current flowing through OPGW due to lightning strike It is conceivable to measure the time change and locate the lightning strike position on the OPGW.

[0007]

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

In a method of installing an accident detection sensor on a steel tower, displaying a mark such as a flag that allows the accident detection result to be observed from under the steel tower, and a patrol member confirming this mark from the ground to identify the steel tower where the accident current has occurred. , To confirm the tower where the accident occurred,
It had to travel along the overhead power line route, which required a great deal of labor and time.

Further, in the method of applying a bend to the portion of the optical fiber core wire combined with the OPGW drawn from the OPGW by receiving the output of the accident detection sensor, and causing a loss in the optical fiber core wire by the bending, In order to apply the bending to the fiber core wire, it is troublesome to pull out the optical fiber core wire from the OPGW for each steel tower.

Further, in the method of installing the information transmission device on the steel tower, the power source used for the information transmission device must be secured, and the system becomes complicated.

Furthermore, as a sensor, a distributed waveguide sensor is used which uses one set of optical fibers, or one set of optical fibers whose one ends are connected to each other, to find the position where a physical phenomenon is applied to an arbitrary position of the optical fiber. In this case, the location of the lightning strike can be located, but there is a problem that the 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.

Therefore, an object of the present invention is to solve the above problems and provide an accident detection position locating system for an overhead power transmission line which has a simple structure and can significantly reduce the labor and time for locating an accident occurrence position. To do.

[0013]

In order to achieve the above object, the present invention is an accident detection position locating system for locating the position of an accident occurring in an overhead power transmission line having an OPGW. And a shock detector installed on a steel tower supporting the overhead power transmission line at a predetermined time interval after the accident is detected.
Apply a mechanical shock or vibration to OPGW with a vibration applying device,
An accident is detected by detecting a change in the state of the propagation light of the optical fiber, and the position where the shock or vibration is applied to the OPGW is located to obtain the accident detection position.

The present invention also provides a fictitious transportation having an OPGW.
Accident detection position location to locate the location of the accident that occurred on the electric wire
In the system, the optical signal is previously sent to the OPGW optical fiber.
Installed on the tower that supports the overhead transmission line
After each accident detector has detected an accident,
OPG with shock / vibration applying device at different time intervals
Applying mechanical shock or vibration to W,
Accident detection is performed by detecting the state change, and OPG
Accident detection position by locating the position where shock or vibration is applied to W
Is to seek .

[0015]

[0016]

[0017]

[0018]

That is, according to the present invention, the sensor section installed in the steel tower section detects an accident current or the like, receives the output of the sensor section, and applies shock or vibration to the OPGW, thereby
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 to generate a time change in the state of the 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 shock or vibration is applied to the OPGW is specified based on this information.

[0020]

With the above structure, two sets of state changes of the propagating light of the OPGW composite optical fiber caused by the shock or vibration applied from the outside of the OPGW in the tower where the accident is detected are suppressed.
It can be detected at the end of the PGW, and it is possible to identify the steel tower to which shock or vibration has been applied by signal processing. Therefore, a simple system can be configured without pulling out the optical fiber core wire from the OPGW, and accident information can be collectively managed by the light receiving / signal processing unit, so that it does not take labor or time to confirm the accident detection position. .

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The present embodiment is capable of locating a lightning strike position and locating an accident detection position by detecting a time change of a state of a propagating light of an optical fiber combined with an OPGW. System.

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

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

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

On the other hand, each tower 5a, 5b,
…, 5z shock / vibration applying device (hereinafter “shock applying device”)
Say. ) (7a, 7b, ..., 7z) is attached. The shock applying devices 7a, 7b, ..., 7z are the steel towers 5a, 5b, ..., With the shock applying devices 7a, 7b ,.
Accident detection device 6 (6a, 6b, installed in 5z
…, 6z) when an accident is detected, the accident detection device 6
A shock is applied to the OPGW 4 in response to the outputs of a, 6b, ..., 6z. Accident detection device 6a, 6
b, ..., 6z detect an accident according to the same principle as an accident detection sensor that is operated by a conventionally used accident current,
When an accident is detected, the impact applying device 7 (7a, 7b ,,
A device having a mechanism for sending a detection output to 7z) is used.

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

Hereinafter, the impact applying devices 7a, 7b, ..., 7z
By detecting the propagating light of the optical fiber in the OPGW 4 when the impact is applied to the OPGW 4,
A method for locating a steel tower (accident occurrence steel tower) to which a shock is applied in step 2 will be described with reference to FIG. 3 is a block diagram of the main orientation device and the sub-orientation device shown in FIG. Figure 4
(A) and FIG. 4 (b) show O / of the main orientation device shown in FIG.
This is the output waveform of the E converter, and FIG. 4C is the composite waveform of both O / E converters. 4 (d) and 4 (e) are shown in FIG.
Is an output waveform of the O / E converter of the sub-orientation device shown in
FIG. 4 (f) is a composite waveform of both O / E converters. Figure 4
4A to 4F, the horizontal axis is the time axis and the vertical axis is the intensity axis.

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

In the main orienting apparatus 1, the light source 11 performs a continuous light emission operation of the wavelength λ1 with a linearly polarized wave output, and the emitted light is a single mode via the optical directional coupler 15 and the optical demultiplexer 16. The optical fiber core wire 8 is made to enter from one end (left side in the drawing) and is emitted to the sub-orientation device 2 from the other end (right side in the drawing) of the optical fiber core wire 8. In the sub-orientation 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 are respectively separated.
3 and is converted into an electric signal (FIG. 4 (d),
(E)).

On the other hand, in the sub-orientation device 2, the light source 21 is
A linearly polarized wave output is used to perform continuous light emission operation of wavelength λ1. The emitted light of the light source 21 enters the other end of the optical fiber core wire 8 through the optical directional coupler 25 and the optical demultiplexer 26,
The light is emitted from one end of the optical fiber core wire 8 to the main orientation device 1. The outgoing light 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. It is incident on 13 and is converted into an electric signal. Normally, since the outputs of the light source 11 and the light source 21 are constant, the outputs of the O / E converters 12, 13, 22, 23 are constant in time. Incidentally, 32 is an O / E converter,
Reference numeral 34 is a display device for displaying the occurrence and position 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, C.
In the case of having terminals, incident light to each terminal is output as A → B, B → C and C → A. The optical circulator is more expensive than the optical directional coupler, but has a feature that the insertion loss is small.

Further, the wavelength of the light source 21 is set 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 wavelengths λ1 and λ3. The object of the present invention can be achieved even with a configuration having a terminal that selectively transmits the light and a terminal that selectively transmits the wavelength λ2. Although it is necessary to use light sources of two kinds of wavelengths for signal detection, it is advantageous to use an optical demultiplexer because insertion loss is smaller than that to use an optical directional coupler.

Hereinafter, a method for locating a steel tower that has detected an accident will be described.

For example, a steel tower 5b located at a distance Lx from the main orientation device 1 (a distance from the main orientation device 1 to the steel tower 5b,
Although the lengths of the optical fibers combined with the OPGW 4 in this section are different from each other in a strict sense, the relationship between these lengths can be dealt with if the design values such as the structure of the OPGW 4 used are known. Here, the same description will be made. ) When the accident detection device 6b detects an accident and applies a shock to the OPGW 4 by the shock applying device 7b at time t0,
The polarization state of the emitted light of the light source 11 propagating through the optical fiber core wire 8 compounded in the OPGW 4 is disturbed by the impact.

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

Similarly, the polarization state of the light emitted from the light source 21 is disturbed by the impact. As a result, 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 t1 after the 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-orientation device 2, the O / E converter 2 is used.
2 output S22 (t) and O / E converter 23 output S2
An output S2 (t) synthesized by using, for example, the formula (3) is obtained by using 3 (t) (FIG. 4 (f)), and the synthesized waveform S2 is obtained.
The time when (t) exceeds the preset threshold value Vth is obtained as t2. The time information obtained by the sub-locator 2 is the transmission signal processing unit 30, the transmission light source 31 of wavelength λ2, the optical demultiplexer 26, the optical fiber core wire 8, the main locator 1
Orientation 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 is output. ) And the output S13 (t) of the O / E converter 13 to obtain a combined output S1 (t) using, for example, equation (4) (FIG. 4 (c)), and the combined waveform S1 (t). Threshold value Vth set in advance
The time when the time is exceeded is obtained 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 modifying the equations (1) and (2). By substituting into the equation (5), the position Lx where the detected polarization fluctuation has occurred can be obtained.

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

On the other hand, in the case of a lightning strike, as shown in FIG. 5B, the rising time is short and the falling time is long. 5A and 5B are OPGW.
FIG. 3 is a diagram showing a shock waveform applied to the graph. In both figures, the horizontal axis is the time axis and the vertical axis is the intensity axis.

Therefore, it is possible to determine from the detected waveform whether the cause is an accident detection or a lightning strike. The polarization state propagating in the optical fiber changes due to the temperature change, but the temperature gradually changes in the natural state, but the lightning current and the shock waveform change instantaneously, so the frequency components of the detected waveform are analyzed. By doing so, it is possible to determine whether or not the cause is 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 steel tower 5, and any steel tower 5a, 5b,
The accident detection device 6a, 6b, ..., 6z of 5z detects the accident, and the impact application device 7a, 7b ,.
Even when a shock is applied to 4, the accident can be detected and the steel tower 5 to which the shock is applied can be located.

Next, a system for locating a lightning strike position 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 apparatus shown in FIG. 6, and FIG. 7 (b) shows in FIG. The synthetic waveform in a sub-orientation device is shown. In FIGS. 7A and 7B, the horizontal axis is the time axis and the vertical axis is the intensity axis. The configurations of the power transmission line, the main locating device 1, and the sub locating 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 the 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 wire 8 that is combined in the OPGW 4 undergoes the Faraday effect when the lightning current propagates through the OPGW 4, and thus the polarization plane rotates (1995). Annual Meeting of the Institute of Electrical Engineers of Japan No. 548).

Therefore, the impact applying devices 7a, 7b, ..., 7
Similarly to the case of detecting 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 two sets of O / E converters, respectively. The waveforms S1 (t) and S2 (t) can be obtained. Waveform detection times t1 and t2 obtained from these detected waveforms,
From the waveform detected by the main orientation device 1, it is found that the detected polarization fluctuation is due to a lightning strike. The location of the lightning strike is located in the same way as the location of the accident detection location.

If a fault current is generated such that the fault detectors 6a, 6b, ..., 6z operate, a shunt component or an inductive component of the fault current may be generated in the OPGW 4 as well.
In this case, there is a possibility that polarization fluctuation will occur due to the current flowing through the OPGW 4, and if the shock detectors 6a, 7b, ... , 7b, ..., 7z may be overlapped with the polarization fluctuation caused by the current flowing through the OPGW 4, which may make it difficult to determine the type of waveform and locate the position.
In order to avoid such a situation, the accident detection devices 6a, 6a
If a predetermined time elapses from the detection of the accident by b, ..., 6z until the shock applying device 7 is operated, and the shock is applied after the shunt component and the inductive component due to the accident that flow into the OPGW 4 are eliminated, the system The reliability can be increased.

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

Therefore, it is possible to further enhance the reliability of the system by setting the time from the detection of an accident to the operation of the impact applying device 7 at different values for each accident detector.

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

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

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

Limit vibration application time (eg, several seconds)
By doing so, it is possible to reduce the power supply capacity of the vibration applying device.

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

The main orienting device 1 is provided on one side of one optical fiber core wire 8 compounded in the OPGW 4 shown in FIG.
The sub-orientation device 2 is connected to the other end, which is substantially the same as the above-described embodiments. The optical systems and functions in the main orientation device 1 and the sub-orientation device 2 are also 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 the preset threshold value, the waveform determination section 17 determines the time t1 and at the same time. , 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's accident detector has operated. In parallel with this frequency analysis processing, the characteristics of the detected waveform are analyzed, and if it is determined that the detected waveform is caused by a 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 location system has both the functions of the location of the accident detection and the location of the lightning strike on the OPGW 4, but in order to reduce the cost, only one of the functions is selected. It is clear that an oriented system can be built.

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, but the present invention is not limited to this. As shown in FIG. 9, an optical fiber folding part 41, which is connected to each other at the other ends of two OPGW composite optical fibers, is installed in the optical fiber termination box 40, and one optical fiber is used as a light source in the orientation device 100. 11 to the other light source, the polarization beam splitter 14, the O / E converters 12 and 13
Even with the configuration in which is connected, it is possible to perform accident detection location determination and lightning strike location determination. At this time, if an optical fiber having a length Lα as an extra length is inserted at the optical fiber turn-back portion, it becomes easy to separate the two sets of polarization fluctuation waveforms, so that the position can be easily located. Become.
Incidentally, FIG. 8 is a diagram illustrating a fault detection position location system of overhead transmission line assumes the present invention, FIG. 9 is a block diagram of a locating system shown in FIG.

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

The lightning strike position can be similarly obtained. This configuration has the advantage that the locator may be installed on only one side of the OPGW, but if it is difficult to distinguish the two sets of fluctuation waveforms, use a light source and a light receiving / signal processing unit at both ends of the optical fiber. It is preferable to have it.

Lx = (c × (t1−t2) + 2 × L0 + Lα) / 2 (8) In the system shown in FIGS. 8 and 9, two optical fibers combined with the OPGW 4 are used. However, the same purpose can be achieved by using only one optical fiber. That is, as shown in FIG. 11, an optical directional coupler or an optical circulator is provided at one end (incident part) of the optical fiber core wire 8 so that the light from the light source 11 is emitted from the optical fiber core wire 8.
To the polarization beam splitter 14 via the optical directional coupler 42 or the optical circulator, and the light returning from the optical fiber core wire 8 is split to the other end of the optical fiber core wire 8. This can be achieved by connecting the device 43 or the optical circulator and returning the propagating light to the optical fiber core wire 8 via the optical directional coupler or the optical circulator. This configuration has the advantage that only one optical fiber is used and the locating device need only be installed on one side of the OPGW 4. Incidentally, FIG. 11 shows the present invention.
The fault detection position location system of overhead transmission line assumes illustrates <br/>.

Incidentally, in the embodiment described so far,
Although the example using the single-mode optical fiber has been described, a multi-mode optical fiber may be used although the position measurement accuracy is slightly lowered.

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

(2) Since the accident detection position can be located without pulling out the optical fiber core from the middle of the OPGW, a system having a simple structure can be formed.

(3) Not only the location of the accident detection position but also the location of the lightning strike position can be determined by the same measurement / signal processing system.

[0068]

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

While propagating an optical signal in advance in the optical fiber of OPGW, when the accident detector provided in the tower supporting the OPGW detects an accident, the shock / vibration applying device applies shock or vibration to the overhead power transmission line, Accident detection is performed by detecting the change in the state of the propagation light of the optical fiber, and the OPG
Since the position where the shock or vibration is applied to W is located to determine the accident detection position, the structure is simple and the effort and time for locating the accident occurrence position can be greatly reduced. The system can be realized.

[Brief description of drawings]

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

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

FIG. 3 is a block diagram of a main orientation device and a sub-orientation device shown in FIG.

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

5A and 5B are diagrams showing shock waveforms applied to the OPGW.

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

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

8 is a diagram illustrating a fault detection position location system of assumptions and became overhead transmission line of the present invention.

FIG. 9 is a block diagram of the orientation apparatus shown in FIG.

10 is a diagram showing a composite waveform of both O / E converters of the orientation apparatus shown in FIG.

11 is a diagram illustrating a fault detection position location system of assumptions and became overhead transmission line of the present invention.

[Explanation of symbols]

1 Main Orientation Device 2 Sub Orientation Device 4 OPGW 5,5a, 5b, ..., 5z Steel Tower 6, 6a, 6b, ..., 6z Accident Detection Device 7, 7a, 7b, ..., 7z Impact / Vibration Application Device (Impact Application Device) , Vibration applying device)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriyasu Morishita 55-2 Okazu, Kakegawa, Shizuoka Chubu Electric Power Company, Kakegawa Electric Power Center (72) Inventor Yasuyuki Otani 55-2, Okazu, Kakegawa, Shizuoka Electric power stock company Kakegawa Electric Power Center (72) Inventor Taiji Ota 55-2 Okazu, Kakegawa City, Shizuoka Prefecture Chubu Electric Power Co., Ltd. Kakegawa Electric Power Center (72) Inventor Kuniyuki Araki 55-2 Okazu, Kakegawa City, Shizuoka Prefecture Chubu Electric power stock company Kakegawa Electric Power Center (72) Inventor Eiichiro Takase 55-2 Okazu, Kakegawa City, Shizuoka Prefecture Chubu Electric Power Co., Ltd. Kakegawa Electric Power Center (72) Inventor Shigeo Nakata 55-2 Okazu, Kakegawa City, Shizuoka Prefecture Chubu Electric Power Co., Ltd. Kakegawa Electric Power Center (72) Inventor Satoshi Yamamoto 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Pref. In-house (72) Inventor Akiyuki Nakamura 5-1-1, Hidaka-cho, Hitachi-shi, Ibaraki Nitrate Electric Cable Co., Ltd. In-house system research institute (56) Reference JP-A-5-126895 (JP, A) Kaihei 6-307896 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01R 31/08-31/11

Claims (2)

(57) [Claims] 1. An accident detection position locating system for locating a position of an accident occurring on an overhead power transmission line having an OPGW, wherein an optical signal is propagated to an optical fiber of the OPGW in advance, and a tower for supporting the overhead power transmission line is provided. There is a predetermined time interval after the provided accident detector detects an accident.
By applying a mechanical shock or vibration to the OPGW with a shock / vibration applying device and detecting a change in the state of the propagation light of the optical fiber, an accident is detected and the position where the shock or vibration is applied to the OPGW is located. Accident detection position locating system for overhead transmission lines, which is characterized by determining the accident detection position. 2. Occurring on an overhead power line having an OPGW.
Accident detection position locating system for locating accident position
To propagate the optical signal to the optical fiber of the OPGW in advance.
Installed on the steel tower that supports the overhead transmission line
After the accident detector detects an accident, it is different for each accident detector.
A shock / vibration applying device is installed on the OPGW after a certain time interval.
Applying mechanical shock or vibration, the state of the propagation light of the above optical fiber
Accident is detected by detecting the state change, and the above OP
Accident detection position by locating the position where shock or vibration is applied to the GW
Accident detection position locating system for overhead power lines characterized by finding the location.