KR101167081B1 - Apparatus for detecting cable damages of power transmission line - Google Patents

Abstract

PURPOSE: A wire damage checking device of a transmission wire is provided to rapidly restore a damaged wire by checking damage of a wire in the initial stages of an installation task of the transmission wire. CONSTITUTION: A drum maintains tension of a wire when installing a transmission wire. A running board prevents the wire to be twisted. A trolley wire extending car maintains the tension of the wire which is installed and controls an inputting direction of the wire. A transmission tower supports the transmission wire. An eddy detector(20) forms a magnetic field to the wire installed at the transmission wire and measures an eddy current. The transmission tower detects whether the wire is damaged or not according to the change of the eddy current.

Description

Wire damage check device of transmission line {APPARATUS FOR DETECTING CABLE DAMAGES OF POWER TRANSMISSION LINE}

The present invention relates to a wire damage check device of a transmission line, and more particularly, to a device for automatically detecting a defect of the wire itself during installation of the wire and the twisted wire loosening occurred during construction, and informs the worker.

In order to protect the wires of ACSR (Stranded Aluminum Stranded Wire), which is mainly used in the construction of 154㎸, 345㎸, 765㎸ transmission lines, the use of unsalted wires to prevent damage that may occur when the wires rotate. Various measures to prevent damage to the wires, such as twisted wires in accordance with the twisting direction of the wires and the introduction of polyurethane-coated stranded wire blocks, have been taken to improve quality.

However, in addition to cable breakage that may be caused by an accident during twisted pair construction, wire damage caused when a running board passes through blocks, scratches on the floor during laying, collision between wires due to wind, collision between wires and wires at long spans, It is true that many quality deterioration factors are latent, such as damages such as rotation caused by preforming errors that can occur during wire fabrication.

Existing technology for solving the problems of the wire generated during the twisted pair work is introducing a method to check the line with the naked eye while moving the transmission line of the high-definition, depending on the manpower as shown in FIG. The situation is exposed to the risk of safety accidents.

In addition, after the extension / longline work of the transmission line is finished, the operator visually inspects the transmission line along the transmission line using spacer cars when installing accessories (spacer dampers). There is a problem in that additional expenses are incurred, resulting in economic losses.

An apparatus for detecting an abnormality in a transmission line of Korean Patent Publication No. 20-1999-0029846 has an upper semicylindrical panel in which a plurality of coils are wound several times, and a plurality of coils are wound several times, so as to be opened and closed with the upper semicylindrical panel. And connected to the lower semi-cylindrical panel, the transmission line is inserted therein, and the coil wound around the upper semi-cylindrical panel and the lower semi-cylindrical panel to inspect the abnormality of the transmission line inserted into the upper semi-cylindrical panel and the lower semi-cylindrical panel. It consists of a detector.

The above technique relates to a method of inspecting an abnormality of a transmission line, but is different from a method of detecting damage of a transmission line by applying a eddy current detector or an image detector to inspect an abnormality of a transmission line.

In addition, GS E & C's `` Robot Inspection Method for Surface Transmission Lines Using Robots '' is equipped with a CCD camera on the robot and remotely controlled to transmit the detected image data to a portable computer with a receiver. A robot was developed to check for abnormalities and was used to inspect overhead transmission lines.

However, the robot checks the abnormality of the wire while rolling on the wire already installed on the transmission line. When passing through the transmission tower installed every 200-300m, the worker has to move the robot after the transmission tower. That is, the situation is still exposed to safety accidents such as the fall of the worker due to the aerial work.

The present invention is to solve the problems described above, and to provide a wire damage check device of the transmission line that can easily check the defects of the wire itself during the construction of the wire or the loosened twisted wire generated during construction.

In addition, it is intended to provide a wire damage check device of the transmission line to repair the damaged wire immediately by outputting a warning sound to notify the operator immediately when the wire is damaged during construction in the transmission line.

Wire damage check device of the transmission line according to an embodiment of the present invention for achieving this object, a drum to maintain the tension of the wire (stranded wire) when the installation of the transmission line, a running board to prevent the twisting of the wire, hypothesis By maintaining a tension of the wire to be controlled and the direction of the wire of the stranded wire, the transmission tower for supporting the transmission line, and by forming a magnetic field in the wire being installed on the transmission line to measure the eddy current through the eddy current is changed through It is characterized in that it comprises a vortex detector for detecting whether the wire is damaged.

As described above, the use of a vortex detector or an image detector to detect twisting or scratching of the wire can be used to check the damage of the wire early (in real time) during the construction of the transmission line so that damaged wire can be repaired quickly. It can be effective. Therefore, there is an effect that can reduce the working time of the transmission line construction and ensure the reliability of the construction, and there is an advantage that the construction cost can be reduced.

In addition, the safety of the worker can be secured by minimizing the exposure of the safety accident of the worker by minimizing the height of work.

1 is a view for explaining an embodiment of checking the wire damage of the conventional transmission line.
2 is a view for explaining the construction of the transmission line according to the present invention.
3 is a block diagram illustrating a vortex detection unit according to an embodiment of the present invention.
4 is a diagram for describing a eddy current detector and an image detector, according to an exemplary embodiment.
Figure 5 is a waveform diagram according to the experimental results of the vortex characteristics according to the medium according to an embodiment of the present invention.
6 is a block diagram of an image detector according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. It should be interpreted as meanings and concepts corresponding to the technical idea of the present invention based on the principle of definition.

Therefore, the embodiments recorded in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.

2 is a view for explaining the construction of the transmission line according to the present invention.

3 is a block diagram illustrating a vortex detection unit according to an embodiment of the present invention.

First, the process of the transmission line is hypothesized as follows.

When constructing a transmission line, as shown in FIG. 2, the wires of the cable drums are connected to a twisted pair car to be installed on a steel tower (transmission tower). Tension is applied between the stranded car and the steel tower so that the stranded wire is not scratched on the floor. However, since there is no device for maintaining the tension between the cable drum and the stranded car, the stranded wire is scratched and damaged on the floor.

In order to maintain a constant tension between the stranded car and the steel tower, the wire is wound around the stranded car, the wire is also twisted while rotating the roller of the stranded car.

In addition, the running board is installed in the area connecting the oral wire and the replacement wire to prevent the twisting of the wire while preventing the twisting when laying the wire, between the towers to prevent the twisting and twisting of the wire, but the twisted pair While passing, it can also cause the wire to untwist.

To this end, a vortex detector according to an embodiment of the present invention is installed on a wire (stranded wire).

As shown in FIGS. 3 and 4, the vortex detector 20 is manufactured and installed to be detachably cylindrical at regular intervals around the strand 10.

The eddy current detector 20 is a module including a coil, and when the eddy current detector 20 approaches the twisted pair 10, an eddy current is generated inside the twisted pair.

The eddy current generates an impedance that depends on the nature of the conductor and the excitation coil, the frequency and magnitude of the current, and the presence or absence of the conductor in the excitation or independent detection coil. As a result, damages (defects) of stranded wires are detected by changing the magnetic field due to discontinuous characteristics such as cracks near the surface of the specimen (stranded wire) by using the property that its size and distribution change due to defects or materials. can do.

As shown in FIG. 5, it can be seen that the value of the output waveform is different when the wire is in a normal state and in a disconnected state. The eddy current detector 20 detects that the damage of the stranded wire is degraded (corrosion or damage) by 15% or more. can do.

In particular, the eddy current detector 20 outputs a warning signal if damage to the twisted pair is found, and the warning signal includes both an audio signal and a visual signal.

As the warning signal is output, the hypothesis of the hypothesized transmission line can be stopped and the hypothesis can be continued after repairing or repairing the fault of the stranded wire.

As another method for detecting damage to the twisted pair, an image detector may be used.

As shown in FIG. 4, the image detector is also installed close to the wire, and there are two methods of detecting damage of the stranded wire through the image detector.

The first is by using image colors.

Based on the data on the image (surface) before the damage of the strand, the image of the portion of the strand that is being photographed is compared with the image.

If the difference with the image before the damage is more than 1mm X 1mm defect (unwinding, scratch) on the surface of the wire, it is regarded as a damage and outputs a warning signal.

The second is to use shape features.

The reference data on the shape or shape of the strand before damage is compared with a partial image of the strand being photographed.

As a result of comparing the reference data with the partial image of the twisted pair being photographed, if the specified range is exceeded, it is regarded as damaged and outputs a warning signal. This method is characterized by low impact on the external environment.

In order to detect damage of twisted pairs through an image detector, the photographing is performed while moving at 0.5 m / s based on VI-1.

FIG. 5 is a block diagram illustrating a method of using shape features. In the case of image enhancement, a process of preventing damage to image processing and visual inspection through preprocessing and postprocessing according to the state of an input image. Do this.

In Feature Extraction, Edge extraction is performed on the basis of edges. So thick edges are obtained by using spatial differential operators such as Sobel and Robert, and indirect methods are performed on feature pixels consisting of one pixel through thinning and punction processes. The binarization is performed simply by the method of acquiring the feature pixels by direct methods such as zero-crossing and boundary detection or by thresholding for region-based operation.

  In Pattern Matching, two-D data based on directionality (movement, rotation), size, and structure of a segment from a locally separated feature point segment is applied to the neural network algorithm. Defects are detected by their presence.

Furthermore, the two methods of detecting the damage of the twisted pair using the image detector may be applied to the image detector one by one or both may be applied to the image detector.

As another method for detecting strand damage, a laser detector can be used.

The laser detector detects damage to the twisted pair by outputting the laser to the twisted pair and comparing whether the light reflected by the outputted laser is different. When the laser is output to the stranded wire and reflected, the shape of the reflected light is the same when the stranded wire is in the same position or shape. However, when the stranded wire is damaged and the wire is untwisted or damaged, the reflected light changes into diffuse reflection. As a result, damage to the stranded wire can be detected, and when the damage is detected, a warning signal such as "beep ~~~~" is output.

The eddy current detector 20 or the image detector 30 or the laser detector is detachably manufactured, and is mounted right behind the twisted pair vehicle when the cable is unfolded from the stranded vehicle so that damage of the stranded wire can be detected immediately.

The eddy current detector 20 or the image detector 30 or the laser detector is connected to the twisted pair car and wired / wireless, and a signal for stopping the unwinding of the wire from the twisted pair car when a damaged portion of the stranded wire is detected through each detector. Outputs The damaged parts are detected so that the wires of the stranded cars are stopped from being released so that the damaged parts can be repaired immediately.

The terms used throughout the present specification are terms defined in consideration of functions in the embodiments of the present invention, and may be sufficiently modified according to the intention, custom, etc. of the user or the operator, and thus, the definitions of the terms are used throughout the present specification. It should be made based on the contents.

Although the invention has been described with reference to the preferred embodiments, which are referred to by the accompanying drawings, it is apparent that various modifications are possible without departing from the scope of the invention within the scope covered by the following claims from this description. .

10: wire (stranded wire)
20: Vortex detector
30: image detector

Claims (12)

Drum to maintain the tension of the wire (stranded wire) when laying the transmission line;
A running board that prevents the wire from being twisted;
A stranded wire vehicle for maintaining the tension of the wires being hypothesized and controlling the pulling direction of the wires;
A transmission tower supporting the transmission line; And
An eddy current detector for measuring a eddy current by forming a magnetic field in a wire under construction in the transmission line, and detecting whether the wire is damaged by changing the eddy current;
Wire damage check device of the transmission line, characterized in that comprises a. The vortex detector of claim 1, wherein
Device for checking the wire damage of the transmission line, characterized in that mounted in the position that the wire is released from the twisted pair car to connect the wire to the transmission tower. The vortex detector of claim 1, wherein
The wire damage check device of the transmission line, characterized in that for outputting a warning signal when detecting the damaged portion of the twisted pair through the eddy current detector. The eddy current detector of claim 2, wherein
And a signal connected to the twisted pair vehicle and outputting a signal to stop the unwinding of the wire from the twisted pair vehicle when a damaged portion of the twisted pair is detected through the eddy current detector. The method of claim 1,
An image detector photographing the twisted pair installed on the transmission line and detecting a damaged portion of the twisted pair by comparing with an image before the damage;
Wire damage check device of the transmission line, characterized in that it further comprises. The method of claim 5, wherein the image detector
Device for detecting wire damage of a transmission line, characterized in that for outputting a warning signal when detecting the damaged portion of the twisted pair through the image detector. The method of claim 6, wherein the image detector
It is mounted at a position where the wire is released from the twisted pair car to connect the electric wire to the transmission tower, and is connected to the twisted pair car. Wire damage check device of the transmission line, characterized in that for outputting a signal. The method of claim 6, wherein the image detector
The wire damage check device of the transmission line, characterized in that for detecting the damaged part by comparing the image color before the damage of the stranded wire and the image color of the photographed stranded wire part. The method of claim 6, wherein the image detector
And detecting the damaged part by comparing the shape characteristic of the stranded wire with the shape characteristic of the photographed stranded wire part. The method of claim 1,
A laser detector for outputting a laser to the twisted pair installed on the transmission line and detecting a damaged portion of the twisted pair by changing the reflected light;
Wire damage check device of the transmission line, characterized in that it further comprises. The method of claim 10, wherein the laser detector
The wire damage check device of the transmission line, characterized in that for outputting a warning signal when detecting the damaged portion of the twisted pair through the laser detector. The method of claim 10, wherein the laser detector
It is mounted at a position where the wire is released from the stranded car to connect the wire to the transmission tower, and is connected to the stranded car. Wire damage check device of the transmission line, characterized in that for outputting a signal.

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