JPH074916A - Transmission-line monitoring apparatus - Google Patents

Abstract

PURPOSE:To provide a transmission-line monitoring apparatus, which can acquire the state of a transmission line by recording a picture when the abnormal shake of the transmission line is detected in the apparatus, wherein a color camera is provided on a steel tower and the abnormal shake of the transmission line is automatically detected based on the picture of the color camera. CONSTITUTION:A color camera 1 having a color extracting means 2 for extracting only the color of a transmission line is provided on a steel tower. The position of the center of gravity of the transmission line is measured by using the picture obtained by the color extracting means 2. The difference between the position of the center of gravity and the reference position of the center of gravity of the transmission line is computed. When the difference becomes larger than a certain threshold value, it is judged by a judging means 7 that the transmission line is abnormally shaking. A picture recording means 9 displays the warning based on the signal outputted from the judging means 7 and records the picture of the color image at the time of the abnormality in a VTR and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention monitors and measures the deviation of a transmission line and the approach of a foreign object, and automatically detects the deviation or the approach of the foreign object when it becomes larger or smaller than a certain threshold value. The present invention relates to a transmission line monitoring device that detects and issues an alarm.

[0002]

2. Description of the Related Art Heretofore, the following means have been known as means for monitoring fluctuations in power transmission lines.

One of the methods is to install an LED that branches off from the power transmission line and emits light by an alternating current power source at one point of the power transmission line, observe the light emitting point of the LED from another point with an ITV camera, and monitor the shake of the power transmission line. It is described in Kaihei 1-305301.

In this monitoring method, the current transformer and LE of the transmission line are used.
Since it is necessary to install a device such as D, it can be applied to a power transmission line that requires special monitoring, but it is difficult to apply it to general power transmission line monitoring.

Further, there has been proposed a transmission line monitoring apparatus which measures the tension applied to a transmission line using a tensiometer and issues an alarm when the tension exceeds a certain threshold value.

However, when this transmission line monitoring device is used, since the tension abnormality of the transmission line is detected by relying only on the tensiometer, the tension value when the abnormality is detected in the transmission line is known, but the transmission line shakes. Therefore, it cannot be said that accurate abnormality detection can be performed.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art, to monitor the sway of a power transmission line, or to detect an abnormality that has occurred near the power transmission line and issue an alarm. An object of the present invention is to provide a transmission line monitoring device capable of more comprehensively grasping the abnormality of the power transmission line and recording it for maintenance by recording the state of the power transmission line at the time of abnormality detection.

[0008]

The above problems can be achieved by the power transmission line monitoring device of the present invention.

That is, 1) install a camera on the steel tower,
In a device that automatically detects abnormal fluctuations in power transmission lines,
The reference fixed point position of the power transmission line is determined in advance, the power transmission line is imaged by the camera through the color extracting unit that extracts only the image of the power transmission line, and the reference fixed point position of the image of the power transmission line is determined on the image capturing screen. By a means capable of tracking the movement of the fixed point position in the captured image, the distance between the reference fixed point of the image of the transmission line and the fixed point position in the captured image is calculated, the change in the distance is tracked, and there is a calculated distance. A transmission line monitoring device, which is capable of automatically determining that the transmission power has become larger than a threshold value and issuing an alarm to warn the occurrence of abnormal blurring of the transmission line.

2) The determination means automatically determines that the distance between the reference fixed point of the image of the power transmission line and the fixed point position in the captured image on the image pickup screen has become larger than a certain threshold value. The image recording means for recording the image of the power transmission line of the camera according to the signal output from the means, and it is possible to perform an appropriate treatment for maintenance of the power transmission line by using the recorded image. The power transmission line monitoring device described.

3) In a device in which a camera is installed on a steel tower to automatically detect the occurrence of an abnormality in the vicinity of a power transmission line, the camera transmits the power via the extraction means for extracting only the power transmission line and solid objects near the power transmission line. The electric wire is imaged, the image of the power transmission line is confirmed on the imaging screen, and it is automatically determined by the determination means that the image of the abnormal solid object near the power transmission line has become a value smaller than a threshold value. Judgment and give an alarm,
A transmission line monitoring device, which is capable of warning that an abnormality has occurred near the transmission line.

A feature of the present invention is that the color of the power transmission line portion is extracted from the image to be monitored, and as an image taken by the camera, an image that is unnecessary for monitoring as much as possible, for example, an image of a background landscape is deleted. The purpose is to clearly display only the image of the object to be monitored on the imaging screen.

In the present invention, there are various methods for selecting the reference fixed point position of the power transmission line, for example, the point at the lowest position when the power transmission line is in a natural state without wind or the like. You can also select the line thickness of the transmission line,
If the length, the shape of the cross section, etc. are known and the position of the center of gravity can be calculated, the position of the center of gravity may be selected, and further, an accessory attached to the power transmission line in advance may be selected. What is important is that the reference fixed point position can be discriminated from the fixed point position selected in advance when the transmission line is shaken due to strong winds, etc. is there. Since the position of the center of gravity of the point transmission line can be calculated only by the shape of the transmission line when moving (including the influence of the camera angle etc.), it is a preferable selection.

It is easy to calculate the actual moving distance of the power transmission line from the distance between the reference fixed point position and the fixed point position on the image pickup screen by means such as storing preliminary simulation data in a computer.

The threshold value is determined empirically if the type of the power transmission line is determined, and the movement distance of the power transmission line and the threshold value can be easily compared by using a comparison circuit, for example. Of course, other means can also be used.

When an aircraft, a bird, or the like approaches a power transmission line, the method of displaying the aircraft, the bird, or the like as a point in an image pickup screen separately from the background is to radiate the radiation from the camera position and reflect it. A method such as observing may be used and can be realized by various means.

However, when the position of the power transmission line and the position of the object become smaller than a certain threshold value, a sound is emitted or a warning such as emitting a light ray is issued to warn an approaching aircraft or bird. Doing is an excellent way to avoid damage. This is because it cannot be said that it is effective even if an image record of the scene is left after the damage occurs.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. However, it goes without saying that the following embodiments are for deepening the understanding of the power transmission line monitoring device of the present invention and do not limit the present invention.

As shown in FIG. 2, a color camera 1 is installed on a steel tower 10, and the color camera 1 is installed at a position where the state of the power transmission line 11 can be clearly confirmed. The color camera 1 is connected to the power transmission line monitoring system of the present invention, the configuration of which is shown in the block diagram of FIG.

The processing means indicated by each block in the block diagram of FIG. 1 means, for example, the barycentric position measuring means, the shake calculating means and the like which have already been described in detail, and therefore, the transmission line monitoring of the present invention will be described below. The system will be described as a circuit composed of processing means indicated by each block.

In FIG. 1, a color camera 1 is a tower 10
The power transmission line 11 is photographed, and the image data passes through the circuit composed of each block as shown in FIG. First, the image data passes through the color extracting means 2 which extracts only the color of the power transmission line 11 and is recorded in the image memory 3.

The color extraction image recorded in the image memory 3 has its center of gravity (fixed point) measured through the center of gravity position measuring means 4 for measuring the center of gravity of the color extraction portion, that is, the transmission line portion. Then, it passes through the transmission line shake calculation means 5 which is set in advance and takes the difference from the reference fixed point position. The difference between the center of gravity position of the power transmission line 11 and the reference fixed point position obtained by the power transmission line blurring calculation means 5 is (Δx, Δy, Δz).
In the case of, the distance D from the reference fixed point position is calculated by the distance calculating means 6 as D in the relational expression D ² = Δx ² + Δy ² + Δz ^2, and the numerical value (D) calculated by the distance calculating means 6 is calculated. When a certain threshold is exceeded, a signal is output through the determination means 7 that determines that the transmission line 11 has an abnormal shake.

The signal output from the judging means 7 is sent to the alarm output means 8 and the image recording means 9. The alarm output means 8 displays an alarm indicating that an abnormality has occurred on the power transmission line on the monitor television or the like, based on the signal output from the determination means 7. Alternatively, an alarm may be issued by voice.
In the image recording means 9, the image output by the color camera is recorded in the VTR or the like by the signal output from the determination means 7.

[0024]

The transmission line monitoring apparatus of the present invention accurately detects abnormal blurring of a transmission line due to environmental factors such as strong winds, automatically issues an alarm, and displays an image photographed by a color camera on a VTR or the like. Since the data can be recorded, the physical and mental burden on the observer can be reduced, and appropriate measures for power line maintenance can be promptly performed after the alarm is issued, which is effective.

When a foreign object approaches the power transmission line, it can be detected accurately and an alarm can be automatically issued to avoid damage.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a configuration of a power transmission line monitoring device of the present invention.

FIG. 2 is a perspective view near a power transmission line showing an embodiment of the power transmission line monitoring device of the present invention.

[Explanation of symbols]

 1 Color Camera 2 Color Extraction Means 3 Image Memory 4 Center of Gravity Measurement Means 5 Transmission Line Shake Calculation Means 6 Distance Calculation Means 7 Judgment Means 8 Alarm Output Means 9 Image Recording Means 10 Steel Tower 11 Power Transmission Lines

Claims (3)

[Claims] Claim: What is claimed is: 1. A device for automatically detecting an abnormal blurring of a power transmission line by installing a camera on a steel tower to determine a reference fixed point position of the power transmission line in advance and extract only an image of the power transmission line. The image of the power transmission line is captured by the camera via the camera, the reference fixed point position of the image of the power transmission line is determined in the image pickup screen, and the movement of the fixed point position in the captured image can be tracked by the means for tracking The distance between the fixed point and the fixed point position in the captured image is calculated, the change in the distance is tracked, and the determination means automatically determines that the calculated distance is greater than a certain threshold value, issues an alarm, and sends the alarm. A power transmission line monitoring device capable of warning the occurrence of abnormal movement of electric wires. 2. The determination means automatically determines that the distance between the reference fixed point of the image of the power transmission line and the fixed point position in the captured image on the image pickup screen has become larger than a certain threshold value. The image recording means for recording the image of the power transmission line of the camera according to the signal output from the means, and it is possible to perform an appropriate treatment for maintenance of the power transmission line by using the recorded image. The power transmission line monitoring device described. 3. An apparatus for automatically detecting the occurrence of an abnormality in the vicinity of a power transmission line by installing a camera on a steel tower and transmitting the image by a camera through an extraction means for extracting only solid objects near the power transmission line and the power transmission line. The electric wire is imaged, the image of the power transmission line is confirmed on the imaging screen, and it is automatically determined by the determination means that the image of the abnormal solid object approaches the power transmission line and becomes a value smaller than a certain threshold value. The power transmission line monitoring device is characterized in that the power transmission line monitoring device is capable of issuing a warning by making the above-mentioned judgment and issuing a warning that an abnormality has occurred near the power transmission line.