JPH02273014A - System for monitoring invasion under transmission line - Google Patents

Abstract

PURPOSE:To monitor the abnormality under the line accurately in a transmission line by the remote sensing in a designated control area by issuing an alarm based on the change of luminance of dots caused by the abnormality under the line in a video sensor. CONSTITUTION:If any change of luminance occurs in dot blocks on the scope of a video sensor 3 by something interstitial, only the changed portion of luminance by that interstitial object will be indicated on the scope of video sensor 3 and at the same time an alarm will be issued according to the change. By this alarm signal a switching mechanism 7 is operated and the picture recording operation of an endless video recorder 6 is stopped, while the power supply to play back the projected image recorded into the endless video recorder 6 to the video monitor 2 is put to work. The point in time the alarm is issued and the state before that can thereby be compared well in contrast and the state of affairs can accurately be judged from how things entailed the change.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a power transmission line intrusion monitoring method for accurately and remotely monitoring abnormalities occurring under overhead power transmission lines [Prior art] ] In recent years, there is a tendency for the transmission tt pressure in overhead power transmission lines to become increasingly ultra-high.

In such ultra-high voltage power transmission lines, it is necessary to ensure a sufficient ground insulation interval to prevent danger.

However, as shown in FIG. 7, for example, there are cases where it is necessary to use a crane truck 21 to perform work under the power transmission line 10, and in such cases, a special supervisor 30 is assigned to carry out the work.
It is necessary to monitor to prevent people from accidentally approaching live parts of power transmission systems*10.

In addition, as shown in FIG. 8, unplanned structures may be built horizontally under the power transmission line 10, and in such cases,
The reality is that daily patrols are carried out along the power transmission lines in order to early detect intruders such as dump trucks 22 coming in and out before the construction is completed.

[Problem to be solved by the invention] When the above-mentioned work is carried out using the crane truck 21 etc., even if the work is carried out by a company that is not directly related to the electric power company, it is necessary for self-protection against any accident. A supervisor from the electric power company is present and monitoring the situation. in this case,
Even when it is not known whether work is being done or not, it is necessary to go to the site every day, which is uneconomical in terms of manpower and time.

Additionally, in order to monitor whether unplanned artifacts are being built or dangerous objects are being installed under the line,
It is necessary to patrol every day as described above.

However, there are still many cases where patrol officers overlook the problem and end up damaging the foundations of houses.

Furthermore, if you continue to patrol the same course every day,
In view of the above-mentioned circumstances, the purpose of the present invention is to monitor the safety of work with heavy machinery such as cranes, and to prevent sideways construction of unplanned structures and dangerous construction. The purpose of this invention is to provide a system for monitoring intrusion under power transmission lines that makes it possible to accurately monitor abnormalities under power transmission lines remotely in a predetermined controlled area, instead of patrolling to check for the presence or absence of objects.

[Means for Solving the Problems] The present invention includes a television camera capable of photographing the area below a power transmission line, a video monitor that visualizes the video signal of the television camera, and a video sensor that outputs the image with brightness in dot units. The TV camera is used to photograph the area under the power transmission line (visualized using a video monitor),
It is possible to issue an alarm based on a change in the brightness of a dot caused by an abnormality under the line in the video sensor, and at that time, an endless video recorder that can continuously record a video signal for a predetermined period of time is separately installed. If necessary, the situation before the current point in time can be played back so that changes on the video screen can be compared and confirmed.

[Operation] It is known to simply install a television camera and a video monitor. However, in the known method, the image is simply continuously viewed visually, and it is easy to get stuck in a rut and overlook the image. Since it appears as a change in the amount of radiation and an alarm can be issued based on this change, there is absolutely no risk of being overlooked as in the conventional case.

Examples] The present invention will be described below with reference to Examples.

FIG. 1 is an explanatory diagram showing how the monitoring system according to the present invention is installed on a power transmission line, and shows a television camera attached to a steel tower 11.

The television camera 1 is installed to be able to photograph the scene 20 under the power transmission AIO line in an appropriate range, and the video signal of the television camera 1 is connected to a communication line 4 or 1 such as a coaxial cable, an optical fiber cable, or a public telephone line. ! ! The information is transmitted to an appropriate controlled area such as a substation using an appropriate transmission means such as a transmission line.

A video monitor 2 and a video sensor 3 are installed in the controlled area, and while the video monitor 2 plays back and displays the images captured by the television camera, the video sensor 3 displays the images (la is a predetermined number of pixels). It is divided and displayed as dots.

FIG. 3(a) shows the above-mentioned S or in a block diagram, and 5 is a distributor that distributes the signal to the video monitor 2 and the video sensor 3.

The under-the-line scene 20 captured by the television camera 1 is reproduced as an image on the video monitor 2, and the observer can remotely view the under-the-line scene 20 on the video monitor 2 without patrolling.

On the other hand, the image appearing on the video monitor 2 is transmitted to the video sensor 3 using pixels divided into horizontal and vertical coordinates (for example, a sensor consisting of 64 horizontal points and 52 vertical points, a total of 3328 pixels is commercially available). There is also a simple version with 11 horizontal points and 14 vertical points, for a total of 1511 points).

FIG. 3(b) is an explanatory diagram showing the state of the screen 3A of the video sensor 3 configured as described above. For example, the coordinates of an arbitrary dot at the pixel xn'y' point are the horizontal (X ), can be easily recognized according to the number of vertical (Y) divisions, and can be confirmed accurately by position.

The scene captured by the television camera 1 is divided into pixels and projected in its entirety on the video sensor 3, but the brightness of each pixel of the video sensor 3 is as long as the same scene is projected there, and As long as the scene is brightening or darkening overall, and as long as a swift object such as a bird is just passing by, there will be no change in relative brightness; however, the second As shown in the figure, when an intruding object such as a crane truck 21 or a dump truck 22 enters the scene 20 of FIG. Causes brightness changes.

In the present invention, when there is no change in the brightness of the dots on the video sensor 3, an image appears on the video monitor 2 but no image is displayed on the video sensor 3, as shown in FIG. It is best to configure it like this:
Then, as in scene 20- of Figure 2, the intruder 21.22
If there is a dot-by-dot change in brightness on the screen of the video sensor 3, only the portion of the brightness change due to the intruding object will be displayed on the screen of the video sensor 3, and at the same time an alarm will be issued according to the change. Make it possible for it to come out.

In this way, the presence of an intruder can be accurately recognized, and there is absolutely no risk of accidentally overlooking it due to a rut. Moreover, regarding the location of the intruder,
After being recognized by the above-mentioned alarm, which can be accurately read from the Y coordinate, the screen of the sensor 3 may be reset manually or automatically.

Even if a television camera is installed to monitor intruders and the image is projected on a video monitor for visual observation, if the changes in the image are gradual, there is a high possibility that the change will be overlooked without being noticed. If it is installed together with the video sensor 3 as described above, it will immediately alert you to any changes in the image and will even tell you its location. Therefore, based on those teachings, if it is determined on the video monitor 2 whether the intruding object is the crane truck 21 or the tamp truck 22, it is possible to accurately confirm the abnormality under the power transmission line from a remote location. can.

FIG. 11 is an explanatory diagram showing another embodiment of the present invention, in which an endless video recorder 6 is arranged between the video monitor 2 and video sensor 3 and the television camera 1.

The endless video recorder 6 rotates endlessly and is configured to continuously record video for a time corresponding to the recording length of the tape or disk. When the above-mentioned alarm is issued due to the intruder, the endless video recorder 6 is stopped. In other words, as shown in FIG. 4, the image of the intruder is captured by the video sensor 3 and an alarm signal is issued. Then, the signal activates the switch mechanism 7, stops the recording operation of the endless video recorder 6, and at the same time turns on the power to the video monitor 2 to play back the video recorded by the endless video recorder 6. .

By doing the above, it is possible to compare the time when the alarm was issued and the state before that, and it is possible to judge the situation more accurately from the state of change.

The above example shows the case where one television camera is installed, but as shown in Fig. 5, multiple television cameras 1.1' and 1'' are installed on different towers and can be switched. R8
By sequentially switching to one video monitor 3 and one video sensor 3, monitoring over a wide area can be carried out economically.

Furthermore, if the video monitor 2 or the video sensor 3 is provided with a video output terminal, the distributor 5 as shown in FIG.
These and the television camera 1 as shown in a) and (b)
can be connected in series.

In addition, it is desirable that the television camera be able to operate electric zoom, autofocus, electric pan head, etc. by remote control, thereby enabling on-site monitoring equivalent to direct patrolling.

Regarding image transmission, it does not necessarily have to be a moving image; frame-by-frame still images may be used as facsimile images using public telephone lines, and even this level is sufficient for maintenance purposes. It can be forced. In particular, when the site and the monitoring location are far apart, this method can be considered to be economical and efficient.As for video sensors, the higher the number of pixels, the more detailed monitoring can be performed and the higher the accuracy. Needless to say.

[Effects of the Invention] As described above, according to the present invention, it is possible to omit on-site patrols by installing television cameras at necessary locations, which has a large effect on reducing personnel costs. Even in cases where it is easy to fall, it will never be overlooked, so the effect of improving the unilateral property is tremendous, and it can also effectively prevent accidents when working under power lines.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing the implementation status of the present invention, and 3.
Figure (a) is a block diagram of a system according to the present invention, (b) is an explanatory diagram of a video sensor, Figure 4 is an explanatory block diagram of another embodiment according to the present invention, and Figure 5 is a further another embodiment. Figure 6 is an explanatory block diagram showing an example of series connection, Figure 7 is an explanatory block diagram of
and FIG. 8 are explanatory diagrams showing specific examples of C-accepted objects under power transmission lines. 1: Video camera, 2: Video monitor 3: Video sensor 10: Power line, 21.22: Intruder Figure 1/2

Claims (2)

[Claims] (1) A television camera that can photograph the area below the power transmission line, a video monitor that visualizes the video signal of the television camera, and a video sensor that outputs the image in dot-by-dot brightness are arranged, and the television camera transmits the A system for monitoring intrusion under power lines that photographs the area under the power lines (visualized using a video monitor) and issues an alarm based on a change in the brightness of a dot caused by an abnormality under the line in the video sensor. (2) In the method of claim 1, an endless video recorder capable of continuously recording video signals for a predetermined period of time is installed, and if necessary, the situation before the current time is played back and changes on the video screen are compared. A monitoring method for intrusion under power lines that allows for confirmation.