JPH04113033U - Power line vibration detection system - Google Patents

Abstract

(57) [Summary] [Purpose] Detect vibrations in power transmission lines by utilizing changes in light intensity of optical fibers and improve detection sensitivity. [Structure] The vibration detection section 1 is constructed by providing a fixed side optical fiber 4 and a movable side optical fiber 5 facing each other in a sensor outer box 3 as a housing. When the power transmission line vibrates, the position of the movable optical fiber relative to the fixed optical fiber shifts, so the amount of transmitted light transmitted between the optical fibers 4 and 5 changes. Vibrations are detected by detecting changes in the amount of transmitted light in the processing device 8.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a power transmission line vibration detection system using optical fibers.

0002

[Conventional technology]

Generally, overhead power transmission lines are exposed to the natural environment, so they are exposed to wind, rain, snow, etc. Power transmission lines vibrate, and in the worst case, this vibration increases and can cause malfunctions such as short circuits and ground faults. This may occur. Failures caused by vibrations in power transmission lines If the power is restarted after the fault has been recovered and before the vibrations in the power line have subsided, Do not turn on the power until the vibration has subsided, as this may cause a malfunction again. It won't happen. Therefore, before energizing, it is necessary to detect whether or not the power transmission line is vibrating. It is necessary to transmit the detected information to the substation that performs the energization operation.

0003 Various devices have been developed to detect vibrations in power transmission lines. , for example, devices that use accelerometers to detect vibrations in power transmission lines, and tension meters that detect power transmission lines. There are devices that detect vibrations in power transmission lines by detecting changes in line tension, and devices that use inclinometers. being developed. The vibration frequency of this power transmission line varies depending on the overhead wire span length, but Usually, it is several Hz to several tens of Hz. If there is a problem with the vibration detection device using the above accelerometer. In this case, an accelerometer is attached to the insulator retaining bracket installed on the steel tower, and the power transmission line vibrates. This detects the acceleration applied to this insulator retaining metal fitting, and transmits power based on this. It is designed to detect vibrations in the wire.

0004 In addition, in the case of a vibration detection device using the above tension meter, the above insulator retaining metal fitting is Transmits electricity by attaching a tension meter to the cable and detecting changes in tension caused by vibrations in the transmission line. It is designed to detect vibrations in the wire.

[0005] Furthermore, in the vibration detection device using the above-mentioned inclinometer, the attached inclinometer tilts in response to the vibrations of the power transmission line, and by measuring changes in this slope, the transmission line can be measured. It is designed to detect vibrations.

[0006]

[Problem that the idea aims to solve]

However, in the detection device using the above-mentioned accelerometer, the installation of the accelerometer is Depending on the location, the acceleration generated can be very small, causing vibrations in the power transmission line. There were cases where it could not be detected. In addition, in the detection device using the above-mentioned tension meter, vibration The change in the tension of the transmission line due to movement is small, and the response of the tension meter itself is also poor. There was a problem that the detection sensitivity was not good because it could not detect minute vibrations. Change However, in the case of the above-mentioned detection device using an inclinometer, the device itself is relatively large. Therefore, there was an inconvenience that the installation location was restricted.

[0007] In addition, in the conventional device described above, the response of each sensor is not good. Not only can relatively high frequency vibrations not be detected, but electrical signals are required to send and receive detection results. This is a disadvantage because it receives noise due to electromagnetic induction from power transmission lines. was there.

[0008] Furthermore, in the conventional device described above, the drive power for driving each sensor is Since it requires a power source, the device itself becomes larger and heavier, which is an inconvenience. Ta.

[0009] The purpose of this invention is to solve the above-mentioned drawbacks of the conventional technology and to create a lightweight, small, and minute vibration An object of the present invention is to provide a highly sensitive power transmission line vibration detection system that can also detect vibrations.

0010

[Means to solve the problem]

The first idea was to detect the vibrations of power transmission lines in order to solve the above problems. In a vibration detection system for , a fixed side optical fiber fixed to the casing and a vibration self-contained fiber are connected to the casing via a movable mechanism. The optical fiber on the movable side, which is held in the a motion detecting section, and a motion detecting section that transmits a motion through the fixed optical fiber and the movable optical fiber. The vibration of the power transmission line is detected based on changes in the amount of transmitted light. be.

[0011] The second idea is to detect the vibrations of power transmission lines in order to solve the above problems. In a vibration detection system for Two optical fibers are provided, and the light from the end face of one optical fiber is transmitted to the other. a reflector that reflects the light toward the end face of the optical fiber is provided in the housing so as to be able to vibrate freely; Changes in the amount of light transmitted through the two optical fibers, including a vibration detection unit The vibration of the power transmission line is detected based on.

0012 The third idea is to detect the vibrations of power transmission lines in order to solve the problems mentioned above. In a vibration detection system for , accommodates an optical fiber formed into a curved shape, for example, a loop shape, and the loop shape A microbend is generated in a part of the optical fiber according to the vibration of the power transmission line. The loop-shaped optical fiber has a vibration detection section provided with a microbend generating means. The vibration of the power transmission line is detected based on the change in the amount of light transmitted through the power line. This is what I did.

[0013]

[Effect]

According to the first idea, the optical fiber on the movable side responds to the vibration of the power transmission line to which the housing is attached. This causes the optical axes of the movable optical fiber and the fixed optical fiber to shift. this As a result, the amount of light transmitted through these optical fibers changes, and this change can be detected. to detect vibrations in power lines.

[0014] According to the second idea, the reflector vibrates in response to the vibration of the power transmission line to which the casing is attached. , this vibration causes the reflection angle of light to fluctuate. As a result, one optical fiber The amount of reflected light that exits the end face of one optical fiber and enters the end face of the other optical fiber changes; Detect vibrations in power lines by detecting changes.

[0015] According to the third idea, micro-bends occur in response to the vibrations of the power transmission line to which the casing is attached. The generation means is to change the amount of microbend generated in a part of the loop-shaped optical fiber. , this changes the amount of light leaking from the optical fiber. Therefore, it passes through the optical fiber. The amount of transmitted light changes, and by detecting this change, vibrations in power lines can be detected. Ru.

[0016]

【Example】

Below, one embodiment of the vibration detection system according to the present invention will be described in detail based on the attached drawings. do.

[0017] FIG. 1 is a schematic cross-sectional view showing an embodiment of the vibration detection system according to the first invention. . As shown in the figure, the vibration detection unit 1 is a sealed housing to be attached to a power transmission line 2. It has a sensor outer box 3 that can be closed, and a fixed side optical fiber 4 is installed inside this sensor outer box 3. and a movable optical fiber 5 are provided. Specifically, the fixed side optical fiber 4 is It is inserted into the interior from one end of the sensor outer box 3, and the penetrating portion is securely fixed to the sensor outer box 3, and therefore the optical axis of the fixed side optical fiber 4 is aligned with the power transmission line. The structure is such that the sensor outer box 3 does not vibrate even when the sensor outer box 3 is vibrated. On the other hand, the movable optical fiber 5 passes through the sensor outer box 3 from the other end. It is completely inserted inside, and a movable mechanism is installed in the penetrating part, so , the optical axis of the movable optical fiber 5 is connected to the power transmission line with the movable mechanism 6 as the pivot center. It is configured to vibrate following the vibration of No. 2. Then, the fixed side optical fiber The end face 4a of the fiber 4 and the end face 5a of the movable optical fiber 5 are arranged so that they face each other. The fibers 4 and 5 are arranged so that their optical axes coincide, and the end face 4 of the fixed optical fiber 4 is a is fixed, while the end face 5a of the movable optical fiber 5 is movable.

[0018] Both optical fibers 4 and 5 transmit light toward this vibration detection section 1 or Light that receives the light that has passed through the vibration detection section 1 and is transmitted to both the optical fibers 4 and 5. connected to a processing device 8 for determining the vibration of the power transmission line 2 based on changes in the amount of transmission. ing. Although not shown, this processing device 8 includes a receiving section for receiving light and a receiving section for controlling the amount of light transmitted. It includes a calculation unit, etc. that processes the amount of change and calculates the vibration of the power transmission line 1 and its frequency. Ru.

[0019] The processing device 8 is installed on a steel tower 9 that supports the power transmission line 2 or on the ground. is attached to the monitoring equipment 10.

[0020] Next, the operation of the embodiment of the first invention configured as above will be explained.

[0021] First, when the power transmission line 2 is not vibrating at all, the end face 4 of the fixed optical fiber 4 a and the end face 5a of the movable optical fiber 5 are completely opposed to each other, and both optical fibers The optical axes of the fibers 4 and 5 are completely aligned. Therefore, either one from the processing device 8 Light sent through one optical fiber is transmitted back through the other optical fiber and then The amount of transmitted light always shows a constant value, for example, the maximum value, and the power transmission line does not vibrate. be judged as such.

[0022] If the power transmission line 2 vibrates due to wind force or some other cause, the fixed optical fiber 4 will be disconnected. Although the movable optical fiber 5 does not vibrate with respect to the sensor outer box 3, the movable mechanism 6 As a pivot axis, it vibrates as shown by the arrow, and as a result, the light between both optical fibers 4 and 5 is The axes, that is, the end surfaces 4a and 5a of both optical fibers 4 and 5 are shifted. For this reason , the amount of transmitted light passing through the vibration detection unit 1 changes, and this amount of change is processed by the processing device 8. Detected. Then, in the processing device 8, the desired amount is determined based on the change in the amount of transmitted light. A certain calculation is performed, the vibration of the power transmission line 2 is recognized, and its amplitude and frequency are also determined. You will be punished.

[0023] In particular, since vibrations of the power transmission line 2 are detected based on changes in the amount of transmitted light, Even if power line 2 vibrates at a high frequency, it is not only possible to detect this, but also to Even minute vibrations can be detected.

[0024] In addition, since light is used as a signal, electromagnetic induction from the power transmission line 2 Not affected by noise.

[0025] Next, an embodiment of the vibration detection system according to the second invention will be explained based on FIG. do. As shown in the figure, this vibration detecting section 12 is connected to a power transmission line (Fig. The sensor has a sealable outer box 3 as a housing to be attached to the sensor (not shown). In this sensor outer box 3, two optical fibers 13 and 14 are arranged parallel to each other. The optical fiber 1 is inserted into the sensor outer box 3 and fixed therein. On the front surfaces of the end faces 13a and 14a of 3 and 14, one of the above two optical fibers is attached. so that the light emitted from the end face of one optical fiber is reflected towards the end face of the other optical fiber. A reflector 15 is set. One point of the lower end of this reflector 15 is the center point. It is swingably supported at the bottom of the sensor outer box 3, and its upper end is located inside the sensor outer box 3. is supported on the side wall of the sensor outer box 3 via a resilient member 16 such as a spring. In response to the vibration, the reflector 15 vibrates using its lower end as a fulcrum, changing the reflection angle of the light. It is configured so that it can be used.

[0026] If the transmission line is not vibrating at all, the reflector 15 is stationary, and therefore, Either one of the two optical fibers, for example, the end face 13a of the optical fiber 13 The light emitted from the optical fiber is reflected by the reflector 15 and enters the end face 14a of the other optical fiber 14. Assuming that the amount of light is always at its maximum value and that the power transmission line is not vibrating, be judged. When the power transmission line vibrates due to wind or other causes, the sensor The attached reflector 5 vibrates in the direction of the arrow with its lower end as a fulcrum, so the optical fiber The angle of reflection of the light emitted from the end surface 13a of 13 varies. As a result, the other optical fiber The amount of light incident on the end surface 14a of 14 will change, and this change in the amount of transmitted light will cause The vibration is detected by the processing device 8 as in the embodiment of the first invention, and the vibration of the power transmission line is detected. can be done.

[0027] Incidentally, in the above embodiment, two optical fibers 13, 1 are used to simplify the explanation. 4 are placed widely apart, but in reality they are placed very close together. Therefore, the amount of light reflected to the other optical fiber can be changed by tilting the reflector 15. I can do it.

[0028] Also, the reflected light from one optical fiber can enter the other optical fiber. If the reflector 15 is set, the two optical fibers should be parallel to each other. Of course, it is not necessary to provide it in this manner.

[0029] Next, an embodiment of the vibration detection system according to the third invention will be explained based on FIG. Ru. As shown in the figure, this vibration detecting section 20 is connected to a power transmission line (not shown) in the same way as in the first invention. It has a sealable sensor outer box 3 as a casing to be attached to (omitted). An optical fiber 21 bent into a substantially circular loop shape is inserted into the sensor outer box 3. is included. A part of this loop-shaped optical fiber 21 is connected to the vibration of the power transmission line. A microbend generating means 22 is provided to generate a microbend according to the motion. ing. Specifically, this microbend generating means 22 has a predetermined weight. It consists of a movable body 23 that moves with the vibration of the power transmission line, and this movable body 23 is connected to the loop-shaped By engaging a part of the optical fiber 21, the micro A bend is formed.

[0030] When the power transmission line is not vibrating at all, the movable body of the microbend generating means 22 Since 23 is stationary, the amount of microbend does not change at all, so the optical fiber The amount of transmitted light transmitted through the power transmission line 21 always shows a constant value, and the power transmission line vibrates. will be judged as not having done so.

[0031] Here, if the power transmission line vibrates due to wind or other causes, it may follow the vibration and cause damage. Since the moving body 23 also vibrates as shown by the arrow, the amount of microbend, that is, the The amount of light leaking from the optical fiber 21 due to the change in the curvature of the bend portion, that is, the amount of light leaking from the optical fiber 21 The amount of transmitted light transmitted within 21 will fluctuate, and this variation in the amount of transmitted light will be In the embodiment of the first invention, the vibration of the power transmission line is detected by the processing device 8 in the same way. I can do that.

[0032] In particular, even when the power transmission line vibrates slightly, the vibration is transmitted through the vibration of the movable body 23. This appears as a change in the amount of microbending, which causes the amount of transmitted light to fluctuate, and therefore, the power transmission Even the slightest vibrations in the wire can be detected.

[0033] In the above embodiment, a microphone is attached to a part of the optical fiber 21 formed in a loop shape. Although the low bend generating means 22 is provided, the present invention is not limited to this, and for example, as shown in FIG. It may be configured as shown. That is, the optical fiber 21 is placed inside the sensor outer box 3 in a semicircular arc. The semicircular arc-shaped optical fiber 21 is formed into a shape and accommodated in the upper end convex part in the vertical direction. A microbend generating means 22 consisting of a freely movable weight 25 is provided. Configure it so that According to such a configuration, depending on the vibration of the power transmission line, the As the weight moves up and down, the amount of bending of the optical fiber 21 changes. Since the amount of transmitted light transmitted through the optical fiber 21 also fluctuates, the vibration of the power transmission line can be reduced. Can be detected.

[0034]

[Effect of the idea]

In summary, the present invention provides the following excellent effects.

[0035] The purpose is to detect vibrations in power transmission lines based on changes in the amount of light transmitted through optical fibers. This makes it possible to detect minute vibrations and improve detection accuracy. Not only can it detect high-frequency vibrations, but it can also detect high-frequency vibrations.

[0036] In addition, since light is used as the detection signal rather than an electrical signal, electromagnetic induction from power lines is avoided. It is not affected by noise caused by conduction.

[0037] Furthermore, since the vibration detection section does not require a driving power source, the device itself can be made lighter and smaller. Not only can it be made smaller and cheaper, but it can also be used at higher voltages. It can be attached directly to the power transmission line.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a vibration detection system according to a first invention.

FIG. 2 is a configuration diagram showing an embodiment of a vibration detection system according to a second invention.

FIG. 3 is a configuration diagram showing an embodiment of a vibration detection system according to a third invention.

FIG. 4 is a configuration diagram showing a modified embodiment of the vibration detection system according to the third invention.

[Explanation of symbols]

1, 12, 20 Vibration detection section 2 Power transmission line 3 Sensor outer box (housing) 4 Fixed side optical fiber 5 Movable side optical fiber 6 Movable mechanism 8 Processing equipment 9 Steel tower 13, 14, 21 Optical fiber 15 Reflector 22 Microbend generation means 23 Movable body 25 Weight

Claims (4)

[Scope of utility model registration request] 1. A vibration detection system for detecting vibrations of a power transmission line, wherein a fixed side optical fiber fixed to the housing and a movable mechanism are connected to the housing within the housing to be attached to the power transmission line. and a movable optical fiber held so that it can freely vibrate, the vibration detecting unit has a vibration detection unit provided with each end face facing each other, and detects the amount of transmitted light transmitted through the fixed optical fiber and the movable optical fiber. A vibration detection system for a power transmission line, characterized in that the system is configured to detect vibration of the power transmission line based on a change in the power transmission line. 2. A vibration detection system for detecting vibrations of a power transmission line, wherein two optical fibers are provided in a housing to be attached to the power transmission line, and the light from the end face of the one optical fiber is A vibration detecting unit is provided in the housing so as to be able to freely vibrate a reflector that reflects toward the end face of the other optical fiber, and the vibration detecting unit is configured to detect vibrations based on changes in the amount of transmitted light transmitted through the two optical fibers. A power transmission line vibration detection system configured to detect vibrations of the power transmission line. 3. A vibration detection system for detecting vibrations of a power transmission line, wherein a curved optical fiber is housed in a housing to be attached to the power transmission line, and a portion of the curved optical fiber is connected to the transmission line. A vibration detection unit is provided with a microbend generating means that generates a microbend according to the vibration of the electric wire, and detects vibration of the power transmission line based on a change in the amount of light transmitted through the curved optical fiber. A power transmission line vibration detection system characterized by being configured as follows. 4. The vibration detecting section, and a processing device configured to transmit light to the vibration detecting section and receive light from the vibration detecting section to determine the vibration of the power transmission line based on a change in the amount of transmitted light. The power transmission line vibration detection system according to any one of claims 1 to 3.