JPH03199911A - Method of measuring distance below transmission line and apparatus for measuring distance between transmission line and object - Google Patents

Abstract

PURPOSE:To measure the distance, i.e., between an aerial transmission line and a tree with high accuracy by recording simultaneously a signal of a running distance measuring apparatus and a distance signal between the position of a moving apparatus and an object below the moving apparatus. CONSTITUTION:A self-running apparatus 1 images a scene of the ground, and records the image on a video tape after converting the image to sound frequencies adjusted to the focal length, while a running distance sensor 3 correctly measures the position recorded on the video tape. The self-running apparatus 1 is allowed to run to a steel tower T2. The result of the recording of the running distance of the apparatus 1 from a steel tower T1 to the steel tower T2 by the distance sensor 3 is represented in an axis of abscissa, and the distance data recorded or stored in a recording apparatus or memory after being converted to a voltage by a voltage converter from the distance between an object below the running apparatus 1 and the running apparatus 1 in the middle of the running distance which is changed to sound frequencies is expressed in an axis of ordinate. If the recording result and distance data are combined, a combined graph is obtained. Accordingly, what is the distance of the object from the transmission line and how much is the object separated from the steel tower can be directly read from this graph, thus enabling quantitative measurement with high accuracy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention accurately measures the distance between an overhead power transmission line and a tree below, and determines whether a predetermined insulation interval is maintained. The present invention relates to a novel method for measuring efficiently and with high precision, and an apparatus used for the method.

[Prior art] Overhead power transmission lines that transmit ultra-high voltage power have a specified distance from objects on the ground according to electrical equipment standards, and if this distance approaches abnormally, a short circuit may occur due to discharge. It is extremely dangerous.

If the object below the overhead power transmission line 30 is a fixed object such as a building 32 as shown in FIG. 1, the initially determined separation distance will not change. However, if the object below is the tree 31, the tree 31 will grow year by year,
It gradually approaches the overhead power transmission line 30 that is overhead. If the proximity of the tree 31 exceeds the electrical equipment standards established previously, it is necessary to cut down and remove the tree.

In this way, it is necessary to always quantitatively measure the separation distance between moving objects, but conventionally, vehicle patrol personnel have usually judged the separation distance by visually measuring it from the ground.
It is impossible to accurately determine the quantitative separation distance, and there is a risk that the distance judgment may differ from person to person.

It is possible to measure the correct separation distance by actually measuring with a surveying instrument, but the trees 31 etc. described above are part of the forest, so it is not possible to measure the trees directly under the power transmission line 30 in the forest. However, in many cases, it is physically impossible for a surveyor to carry out a survey using a surveying instrument, as many trees in the foreground obstruct the attempt.

In addition, it is possible to visually measure using a helicopter, but it is not only uneconomical but also impossible to quantitatively and accurately measure the separation distance. This is no different from measurements made with a telescope.

[Problems to be Solved by the Invention] Therefore, a proposal has been made to accurately measure the distance between the power transmission line 30 and the tree 31 mechanically.

For example, in Japanese Utility Model Application Publication No. 63-145111, the distance between the power transmission line 30 and the tree 31 is determined by running a vehicle on the power transmission line and measuring the distance at two points, one in the front direction and one on the side. There is a proposal to conduct a survey, and there is also a proposal for
Publication No. 228019 also discloses a technique for measuring the distance between a steel tower and a tree based on measurement data between two points.

However, in any of the above techniques, the equipment itself is extremely complex, and requires complex arithmetic processing based on survey results. Looking at it, it is difficult to say that it is necessarily a favorable proposal.

An object of the present invention is to provide a new method for easily measuring the distance between an overhead power transmission line and trees located under the line with extremely high accuracy using an extremely simple device compared to the existing proposals as described above; The present invention aims to provide a simple and highly accurate inter-object distance measuring device that can be used.

[Means for Solving the Problems] The present invention provides a traveling machine capable of traveling on a power transmission line, and a traveling distance measuring device capable of measuring the distance traveled by the traveling machine;
A separation distance measuring device capable of accurately measuring the separation distance between objects below the traveling machine is provided, and a signal from the traveling distance measuring device and a separation distance measurement signal from the object below at the moving position of the traveling machine are simultaneously recorded. The horizontal axis is the traveling distance of the traveling machine, and the measured distance from the object below is the vertical axis, and the distance traveled and the corresponding distance from the object below are displayed on a chart or a video device. A video camera that can automatically adjust the focal length to the object to be photographed is used as a distance measuring device between objects, and when the video camera automatically operates mechanically to adjust the focal length, the electric signal is converted into an audio signal. The recording level of the videotape is converted to the original focal length signal, and the signal is input to a predetermined recording device or storage device for recording or storage.

[Function] As a device for measuring the distance between objects mounted on a traveling machine running on a power transmission line, an optical measuring device such as an infrared range finder or a device using ultrasonic waves such as an ultrasonic range finder may be used. However, it is preferable to use a video camera that can automatically adjust the focal length to the object to be photographed.

The focal length of this automatic focusing type video camera can be measured with extremely high precision, and it has the great advantage of being able to do this automatically. In addition, by directly connecting a video camera to a television using a coaxial cable, it is possible to take measurements while actually observing the movement of moving power lines. It is.

[Example] The present invention will be sequentially explained below with reference to Examples.

Figure 1 shows that - as an example, the span between the steel tower T1 and the steel tower T2 is 30
0 m, and is an explanatory diagram showing how the distance between a tree 31 and a building 32 below a power transmission line 30 that is installed between them is measured by the method according to the present invention.

Reference numeral 1 denotes a traveling machine that can run on a power transmission line, and in this case, an example will be described in which a self-propelled machine that can run on power is used. 2 is a power source that provides driving force to the self-propelled machine and a radio receiver for wireless operation, which will be described later; 3 is a radio receiver for wireless operation, which will be described later;
This is an odometer that can accurately measure the distance traveled. The Emperor is an object distance measuring device, and as explained above, an optical or ultrasonic measuring device may be used, but below we will use a video camera with an automatic focusing mechanism as shown in Figures 3 to 5. It is highly preferred to use 11.

That is, FIG. 3 is an explanatory diagram showing a specific configuration of the inter-object distance measuring device Retired Emperor according to the present invention.

In the figure, numeral 11 is the already explained video camera capable of automatic focusing, and 12 is the automatic focusing mechanism. This automatic focusing mechanism varies in ms depending on the manufacturer.
In short, it has a sensor that can detect the distance between the camera and the object to be photographed with high precision, and converts the signal from the sensor into an electrical signal to drive a small motor to drive the lens of the video camera. It is configured so that it can be rotated to match a predetermined focal length.

This automatic focusing mechanism is designed to ensure higher accuracy as the distance is shorter, and is suitable for highly accurate distance detection, such as measuring the insulation gap between a power transmission line and an object below it. It is very conveniently constructed.

The signal of the focal length between the object detected by the automatic focusing mechanism (which can directly indicate the distance between the video camera and the object to be photographed) is converted into a focal length-voltage converter. The voltage converted into the voltage is connected to the voltage-audio frequency converter 15 by the lead wire 14, and is converted into an audio frequency corresponding to the voltage.
A lead wire 16 is arranged to input the sound to the microphone's audio input terminal 17, and the sound is recorded on the videotape 18 as it is.

In this way, we photograph the area below from the self-propelled aircraft, convert it to an audio frequency that matches the focal length, and record it on videotape.
One odometer accurately measures the position where the video tape was recorded, and the self-propelled aircraft 1 reaches the tower T2.
It allows the vehicle to run.

At this time, if you connect the coaxial cable 26 to the video monitor output terminal 25 of the video camera and connect the coaxial cable to the TV monitor 27 on the ground, you can
It is possible to monitor the state of the object below one by one as the object l travels.

In FIG. 3, reference numeral 19 denotes an audio monitor output terminal, which is connected by a lead wire 20 to an audio frequency-to-voltage converter 21, and further connected to a recorder 23 or an indicator 24 by a lead wire 22.

Note that FIG. 4 is a block explanatory diagram showing the state of audio input from the focal length-voltage converter 13 to the videotape 18;
In FIG. 5, the videotape 18 recorded in this way is rewound, inputted from the audio monitor output terminal 19 to the audio frequency-to-voltage converter 21, the audio frequency is converted to voltage again, and the audio frequency is converted to voltage. FIG.

As described above, the distance traveled by the self-propelled aircraft 1 from the steel tower Tl to T2 is recorded by the odometer 3, and the horizontal axis represents the distance between the moving objects converted into audio frequency at the intermediate distance. is converted into voltage by a voltage converter, and the separation distance data recorded or stored in a recorder or storage device is synthesized as a vertical axis.
A composite graph as shown in the figure is completed. If you look at the graph in Figure 2, you can directly read how far away from the tower it is and how far away it is from the power transmission line. It becomes possible to accurately and quantitatively measure the distance between objects and the position having that distance.

In addition, in Fig. 1, 2A is a transmitter for the self-propelled aircraft, which enables radio communication with the radio receiver installed in 2, which has already been explained, and is capable of starting and stopping the self-propelled aircraft, etc. This is done by radio control, and can be used, for example, when the TV camera 11 reaches a certain position, first switch to radio control and zoom up the TV camera to accurately enlarge and observe that position. It is.

In this way, if the video camera can be operated from the ground, the TV monitor 2 explained earlier in Figure 3 can be used.
In order to make it easier to monitor the power transmission line 30 and to observe the necessary details, it is possible to not only measure the separation distance but also actually observe the details of the transmission line 30 from above while observing the object. The excellent feature of being able to measure separation distance can be demonstrated.

1. Although the case where a self-propelled machine is used as the traveling machine running on the power transmission 4130 is illustrated, this does not necessarily have to be a self-propelled machine, and it may be run by any method such as one that is driven by human power or one that is pulled by a rope. Of course, there is no problem even if it is.

[Effects of the Invention] As described above, according to the present invention, it is possible to easily measure the distance between objects carried by overhead power transmission lines, especially in places where it is necessary to measure the distance between objects that continue to grow year after year, such as trees. It can be measured quantitatively, making it possible to accurately determine whether or not it is necessary to cut down trees, and is of great significance as it can completely eliminate unforeseen accidents that may occur due to errors in visual estimation by patrollers. Furthermore, the present invention can be easily measured by using only an extremely general-purpose and inexpensive device such as a television camera, and the present invention has an extremely large effect in combination with its economical effects.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing how measurement is performed using the power transmission line retracting object separation distance 2 measurement method according to the present invention;
Figure 2 shows the measurement results, and is a graph showing the distance on the horizontal axis and the separation distance from the retracted object on the vertical axis, and Figure 3 is a graph used in the method according to the present invention. Explanatory diagrams 4 and 5 showing specific examples of the distance measuring device between objects
The figure is a block explanatory diagram for explaining the operation status of each of FIG. 3. 1: Self-propelled aircraft, 2: Self-propelled aircraft power and radio receiver, 2A: Transmitter for self-propelled aircraft, 3: Odometer, Emperor: Distance measuring device between objects, 11: Video camera, 12: Auto focus 13: Focal length-voltage converter, 15: Voltage-audio frequency converter, 17: Audio input terminal, 18: Video tape, 19: Audio monitor output terminal, 21: Audio frequency-voltage converter, 23 : Recorder, 24: Indicator, 25: Video monitor output terminal, 26: Coaxial cable, 27: TV monitor 30: Power line, 31: Tree, 32: Building, T1. T2 - Steel tower.

Claims (2)

[Claims] (1) A traveling machine capable of running on a power transmission line is equipped with a mileage measuring device that can measure the distance traveled by the traveling machine, and a separation distance measurement device that can accurately measure the distance between objects below the traveling machine. A device is provided to simultaneously record or store the signal from the traveling distance measuring device and the signal for measuring the distance from the lower object at the moving position of the traveling machine, and calculate the distance from the lower object measured with the traveling distance of the traveling machine as the horizontal axis. A power transmission distance measurement method in which the distance traveled and the corresponding distance to an object below are displayed on a chart or a video device, with the vertical axis being . (2) Using a video camera that can automatically adjust the focal length to the object to be photographed, the video camera automatically operates mechanically to convert the electric signal generated when adjusting the focal length into an audio signal and tape the video tape. A device for measuring separation distance between objects, which is configured to be capable of recording or storing the video tape by converting the recording level of the videotape into the original focal length signal and inputting the signal to a predetermined recording device or storage device.