JPH07306992A - Warning system for overhead power transmission line and signal transmitting device used for the same - Google Patents

Abstract

PURPOSE:To prevent a minor collision of a flying body with overhead power transmission lines by providing a signal transmitting device, which sends a signal showing the presence of an overhead power transmission line, on the overhead power transmission line and providing the flying body with a receiver which recognizes the presence of the overhead power transmission line by receiving the signal. CONSTITUTION:A signal transmission device 3 is mounted on each span of an overhead power transmission line 2 layed on a transmission steel tower 1. A receiver 6 on a helicopter 5 recognizes the presence of the overhead power transmission line by receiving a signal. When a signal carried by radio waves is received, a warning sound showing the presence of the overhead power transmission line is sent to a pilot and a warning is performed through a lamp installed at the pilot's seat. From among the plural received signals one with the highest intensity is separated. Based on the signal intensity, an approximate distance from the helicopter 5 to the signal generator 3 is calculated. It is notified to the pilot in the form of numerical display.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm system for causing a flying object to be recognized by a flying object to prevent a contact accident, and more particularly, to notify the whereabouts of an overhead power transmission line to prevent a contact accident at a low altitude of the flying object. The present invention relates to a warning system for an overhead power transmission line which can be prevented and can be used regardless of day or night, weather, and environment, and a signal transmission device used therefor.

[0002]

2. Description of the Related Art The height of a high-rise building or tower is 6
It is well known that aviation obstruction lights are required to be installed on buildings over 0 m in order to prevent accidents such as contact with aircraft. However, conventionally, there is no aviation obstruction light that can be installed on the overhead power transmission line, so that no special aviation obstruction light is installed on the overhead transmission line.
For this reason, contact accidents with overhead power lines cannot be avoided. In particular, there is no end to accidents where helicopters, etc. flying at low altitude for the purpose of spraying pesticides, etc. make contact with overhead power lines and crash. Regardless of the height of the overhead power line, it is desirable to install an aviation obstruction light so that the aircraft can fly safely in the vicinity.

In view of the above requirements, there has been proposed a marker light which can be mounted on the overhead power transmission line itself. Actual fairness 4-53145
Japanese Patent Laid-Open Publication No. 2000-242200 discloses a nighttime beacon device for an overhead power transmission line that causes an LED (light emitting diode) mounted on the overhead power transmission line to emit light by an induced current of the overhead power transmission line.

[0004]

However, since the above-mentioned marking device notifies the presence of the overhead power transmission line by the light emission signal,
It is difficult to use in bright surroundings during the day, and it is difficult to use in an environment where it is difficult to recognize the light emission signal due to the proximity of the city or road even at night. In addition, it is difficult to use even in bad weather such as dense fog.

By the way, most of the accidents in which a helicopter or the like comes into contact with an overhead power transmission line and crashes occur during the daytime when the weather is fine, and moreover, due to the operator's carelessness. That is, even if the visibility is good, it is not easy to visually recognize the overhead power transmission line.

Therefore, there is a demand for a reliable alarm system that can be used regardless of day or night, weather, or environment, and that recognizes the presence of an overhead power transmission line without depending on the visual sense of the operator and alerts the operator.

Therefore, an object of the present invention is to solve the above problems, to inform the location of an overhead power transmission line, to prevent a contact accident of a flying object at low altitude, and to use it regardless of day or night, weather, environment, An object of the present invention is to provide an alarm system of a highly reliable overhead transmission line and a signal transmission device used for the alarm system.

[0008]

In order to achieve the above object, the present invention provides a signal transmission device for transmitting a signal indicating the location of an overhead power transmission line by radio waves to the overhead power transmission line, a power transmission tower or in the vicinity thereof, On the other hand, the aircraft is equipped with a receiving device that receives the above signals and recognizes the location of the overhead power transmission line.

Infrared rays or ultrasonic waves may be used for the signal.

The signal transmission device may be formed so as to be divided so as to surround the overhead power transmission line so as to be mounted, and the signal transmission device may be provided with a power source section for obtaining operating power by induction from the transmission current of the overhead power transmission line. Good.

The signal transmission device used in the alarm system uses an induction coil that generates an induction current from a transmission current of an overhead power transmission line, a power supply circuit that supplies stable power based on the induction current, and the stable power. Attached to an overhead power transmission line by combining a transmitter that transmits a signal indicating the location of the overhead power transmission line by radio waves, and a split body that is composed of two or more split bodies so as to surround the overhead power transmission line, and at least the above induction coil is overhead transmitted. A holding member that holds the wire on the outer periphery thereof.

The signal transmission device may include a signal light for indicating the location of the overhead power transmission line by using the stable power.

[0013]

With the above configuration, the overhead power transmission line, the power transmission tower, or a signal transmission device provided near these transmits a signal for notifying the location of the overhead power transmission line by radio waves. On the other hand, the receiving device mounted on the flying body receives the signal and recognizes the location of the overhead power transmission line. This warning system draws the attention of the operator, and even when the overhead power transmission line is not visible, it can be avoided without fail. Since the location of the overhead power transmission line is notified using radio waves, it can be used regardless of day or night, weather, or environment.

The signal transmitted from the transmitter can use infrared rays or ultrasonic waves in addition to radio waves. Even when infrared rays or ultrasonic waves are used, as with the case of using radio waves, the transparency is better than that of visible light, and the receiving side emits less radiation from the background environment, making recognition easier. .

The type and frequency of the signal should be such that there is little noise in the environment in which this alarm system is placed, other signals that interfere are small, and that the environment is not adversely affected by radio interference or the like. You will have to choose
It cannot be specified.

The output of the signal transmitted from the transmitter (or the reaching distance of the signal) is weak enough to avoid interference with the signal generated by a similar signal transmission device installed in another place, and the flight is made in the vicinity. The flying vehicle must have sufficient range to take evasive action after receiving the signal. However, these output conditions cannot be specified numerically because they depend on the environment in which the alarm system is placed and the flight capability (for example, turning radius) of the aircraft that is expected to fly in the vicinity.

The air vehicle to which the alarm system of the present invention is applied includes light aircraft such as airships and balloons, aircraft such as airplanes, light aircraft and gliders, rotary wing aircraft such as helicopters, hang gliders and paraglider parachutes. Aircraft or parachutes, regardless of whether they are radio-controlled or manned.

Regarding the installation location and method of the signal transmission device, it is preferable that the signal transmission device is installed on the overhead power transmission line itself and directly attached to the overhead power transmission line. Also, it is important to be able to install it on the existing overhead transmission line. For this purpose, the signal transmission device is formed so as to be divided.
Enclose the overhead power transmission line with the divided signal transmitters, connect them, and attach them to the overhead power transmission line. As a result, the overhead power transmission line can be attached without any modification, and the detachment is facilitated.

It is preferable that the operating power of the signal transmission device can be stably supplied and maintained for a long period of time. For this purpose, the signal transmission device is provided with a power supply unit that obtains operating power by induction from the transmission current of the overhead power transmission line. Since the power supply unit obtains the operating power from the transmitted current, it can be used permanently.

Next, in the signal transmitting device used in the alarm system, the induction coil generates an induction current from the transmission current of the overhead power transmission line. The power supply circuit supplies stable power based on this induced current. This stable power becomes the operating power of the signal transmission device. Therefore, even if there is a change in the power transmission current, the signal transmission device operates stably without being affected by it. Since the transmitter uses this stable power to transmit a signal informing the whereabouts of the overhead power transmission line by radio waves, the strength, reach distance, and frequency of the radio waves are maintained stable, and reliable regardless of fluctuations in the transmission current. An alarm system is available.

Further, the holding member is composed of two or more divided bodies and is attached to the overhead power transmission line by combining the divided bodies so as to surround the overhead power transmission line. That is, the signal transmission device is formed so as to be separable and attached to the overhead power transmission line. The holding member holds the induction coil on the outer circumference of the overhead power transmission line. Since the induction coil is held around the overhead power line,
The induced current can be efficiently generated.

The signal transmission device may have a signal lamp in addition to the transmitter. That is, the signal light uses stable power to notify the location of the overhead power transmission line. In this case, the alarm system is activated by the signal from the transmitter, so you can be careful of the signal lights, and you will be able to discover the overhead power transmission line that you missed in the past, while observing the overhead power transmission line. You can certainly avoid this.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, in the alarm system of the present invention, the overhead power transmission line 2 laid on the power transmission tower 1
One signal transmission device 3 is attached for each span (between transmission towers). The signal transmission device 3 is arranged substantially in the center between the power transmission towers and is located at a height of about 50 m above the ground.

As shown in FIG. 2, the signal transmission device 3 includes a power supply unit 21 for obtaining operating power by induction from a transmission current of an overhead power transmission line and a transmission unit 22 for transmitting a signal notifying the location of the overhead power transmission line. Consists of. In this embodiment, radio waves are used as signals. The power supply unit 21 includes an induction coil 23 that is arranged around the overhead power transmission line and generates an induced current from the transmission current of the overhead power transmission line, and a power supply circuit 24 that is configured by a wiring circuit and supplies stable power based on the induced current. Consists of. The power supply circuit 24 includes an I / V converter that converts a current into a voltage and a power supply controller that stabilizes the voltage / current, and can supply a constant voltage and a constant current without being affected by fluctuations in the transmission current. Here, the output of the power supply unit 21 is set to a voltage / current of DC 12V and 0.5A.
The transmitter 22 is composed of a transmitter 25 and an antenna 26 for transmitting a signal for notifying the location of the overhead power transmission line by radio waves using the stable power. The transmission output of the transmitter 25 is 200 mW,
The transmission frequency is 27 MHz, and the signal waveform is pulse. The signal reaches a straight line of about 500 m. The reason why the signal waveform is a pulse is to improve the signal separation from noise. Further, another frequency is used for another signal transmission device 3 installed within 500 m, which is the reaching distance, to prevent interference.

As shown in FIG. 3, the signal transmission device 3 includes a clamp 31 for fixing to the overhead power transmission line 2, an induction coil section 32 accommodating the induction coil 23, and an antenna 26.
It comprises a slip ring 35 to which a weight 34 and a weight 34 are attached, and a transmitter 33 that houses the power supply circuit 24 and the transmitter 25, and the clamps 31 are provided at both ends. The clamp 31 is fixed to the overhead power transmission line 2, and the induction coil unit 32 and the transmitting unit 33 are fixed to the clamp 31. The slip ring 35 is rotatable around the overhead power transmission line 2, and even if the overhead power transmission line 2 is twisted or shaken,
The part to which the weight 34 is attached is positioned below due to its weight. The antenna 26 is attached to the opposite side of the weight 34, and can always keep vertical to the ground.

Each of the clamp 31, the induction coil portion 32, the slip ring 35, and the transmitting portion 33 is formed in a cylindrical shape, and is divided into two parts along a plane along the center line. That is,
These are divided bodies 31a, 31b, 32a, 32b, 35.
A holding member 36 composed of a, 35b, 33a and 33b is configured. The holding member 36 is attached to the overhead power transmission line 2 by combining the divided bodies so as to surround the overhead power transmission line 2. The induction coil 23 is housed in the induction coil portion 32, and thus is held on the outer periphery of the overhead power transmission line 2.

Returning to FIG. In this embodiment, a small helicopter 5 is used as the flying body 4. Small helicopter 5
The receiving device 6 mounted on the vehicle receives a signal and recognizes the location of the overhead power transmission line. In this embodiment, when the signal by the radio wave is received, the overhead power transmission line is near to the operator. A warning sound is emitted to that effect, and a lamp installed in the cockpit is turned on and blinks to give a warning. In addition, the signal having the highest intensity is separated from the plurality of received signals, the approximate distance from the small helicopter 5 to the signal generator 3 is calculated based on the signal intensity, and the operator is informed by the numerical marking. Also do things. Further, the distances to the respective signal transmission devices 3 are calculated from the plurality of received signals, and, on the other hand, the signals are obtained from the overhead line layout diagram of the overhead power transmission line in the flight area stored in the computer mounted on the small helicopter 5 in advance. The distances between the transmitters 3 are obtained, and from the distance relationship between them, the small helicopter 5 to the overhead power transmission line 2
It also calculates the shortest straight line distance to and informs the operator. That is, if the distance from the small helicopter 5 to the two signal transmitting devices 3 adjacent to each other and the distance between the two signal transmitting devices 3 are obtained, the triangular shape having the small helicopter 5 and the two signal transmitting devices 3 as vertices is obtained. The vertical line corresponds to the shortest straight line distance.

Next, the operation of the embodiment will be described.

The signal transmitters 3 mounted on the spans of the overhead power transmission line 2 each transmit a signal for notifying the location of the overhead power transmission line by obtaining operating power by induction from the power transmission current. The signal transmission devices 3 located within the range in consideration of the signal arrival distance transmit signals at frequencies different from each other.
The receiving device 6 mounted on the small helicopter 5 flying in the vicinity receives all the arriving signals regardless of the frequency,
The approximate distance to the signal generator 3 that has obtained the strongest signal among these signals is calculated, and the operator is informed by a numerical marking. Further, the distances to the respective signal transmission devices 3 are calculated from the plurality of received signals, and on the other hand, the distances between the signal transmission devices 3 from the overhead wiring plan of the overhead power transmission lines in the flight area stored in the computer in advance. From the small helicopter 5 to the overhead transmission line 2
Calculate the shortest straight line distance to and inform the operator.

The result of the operation test of the alarm system will be described.

The small helicopter 5 was made to fly vertically and obliquely to the overhead power transmission line 2 at an altitude of 70 m. The linear distance from the signal generator 3 to the small helicopter 5 is 485-
It was confirmed that the alarm was activated when approaching 540 m. The strength of signal reception depends on the attitude of the small helicopter 5 and the overhead power transmission line 3.
It is difficult to accurately calculate the distance from the received signal because it slightly varies depending on the positional relationship with, but we succeeded in calculating within the error range of ± 20 m.

Next, another embodiment will be described.

In the signal transmission device 3 shown in FIG. 4, a signal light section 41 is provided between two clamps 31 and two induction coil sections 32. The clamp 31 and the induction coil portion 32 are the same as those in FIG. Signal light section 41
Is formed into a two-divided cylindrical shape, accommodates the power supply circuit 24 inside, and has a large number of LEDs on the surface. These LEDs emit light by using the stable power of the power supply circuit 24 to inform the location of the overhead power transmission line. Signal light section 41
Is rotatable around the overhead power transmission line 2, and has a transmitter 42 attached to one side. Even if the overhead power transmission line 2 is twisted or swayed due to the weight of the transmission unit 42, the transmission unit 42 is always located below and the direction of signal emission by the LED is stabilized. A transmitter 25 is accommodated in the transmitter 42, and a two-element antenna 43 is horizontally mounted.

The rating of the transmitter 25 is the same as that of FIG. In the signal light portion 41, 9 × 30 rows of red LEDs are arranged so that the light emitting direction is the radial direction.

Using this configuration, it has been confirmed that the performance of the signal by radio waves is equivalent to that obtained in the operation test in the previous period. Regarding the performance of the signal from the LED, it was possible to confirm the light emission of the LED from a position 1 km away as a linear distance when it was fine at night.

Although the signal transmission device 3 is installed in the center of the span of the overhead power transmission line 2 in each of the above-described embodiments, it may be installed in the power transmission tower 1 or in the vicinity of the overhead power transmission line 2 or the power transmission tower 1.

Further, although the signals are transmitted by radio waves or infrared rays in the above-mentioned respective embodiments, ultrasonic waves may be used. Even in the case of ultrasonic waves, the output intensity is set in consideration of the reachable range, and multiple frequencies are used to prevent interference.

An application example of the present invention will be described.

1) The signal from the signal transmission device 3 may be provided with information such as the height of the overhead power transmission line 2, the direction of the overhead line, and the position on the map. The receiving device 6 of the flying object 4 can read these pieces of information to know its own height, direction, and position on the map from the position relative to the overhead power transmission line 2, which can be used for safe flight.

2) The distance between the flying body 4 and the overhead power transmission line 2 may be obtained from the strength of the signal received by the receiving device 6.
As described in the embodiment, the distance to the signal transmission device 3 is calculated from the signal strength, and the signal transmission device 3 is calculated from the overhead wire layout diagram.
When the distance between them is obtained, the shortest straight line distance to the overhead power transmission line 2 can be calculated. By notifying the operator of this with numerical markings, it is possible to encourage appropriate avoidance behavior.

3) The receiving device 6 is a continuous overhead power transmission line 2
It is also possible to detect signals from two or more signal transmission devices 3 installed in the vehicle and obtain the overhead line direction of the overhead power transmission line 2. That is, 2
It is possible to know that the overhead power transmission line 2 is on the line connecting the signal transmission devices 3 by using the distance to the signal transmission device 3 described above.

4) Part or all of the signal transmission device 3 including at least the antenna is rotatable with respect to the overhead power transmission line 2, and the antenna maintains a constant direction even when the overhead power transmission line 2 is twisted or shaken. You may do it. The slip ring 35 and the signal light unit 41 used in the embodiment may be used, or other configurations may be used.

5) A signal may be received by the receiving device 6 mounted on the air vehicle 4 such as a radio-controlled airplane or airship, and the air vehicle 4 may further communicate this information to the ground operator. In the case of radio control, it is difficult for the operator to visually recognize and avoid the overhead power transmission line 2, so this alarm system is effective.

6) The signal from the signal transmission device 3 may have directivity. For example, by weakening the signal in the vertical direction of the overhead power transmission line 2 and strengthening the signal in the horizontal direction, radio wave interference to houses and equipment on the ground is prevented. For that purpose, the antennas 26 and 43 have directivity. in this case,
Aircraft 4 flying above the overhead power transmission line 2
However, the signal will reach the air vehicle 4 that is flying at low altitude, which is in danger of contacting the overhead power transmission line 2.

7) The signal transmission device 3 not only obtains the operating power by induction from the transmitted current, but also obtains data relating to the power transmission condition from the current, voltage, etc. of the induced current, and puts this data on the signal to be transmitted. Good. As a result, the data can be read from the signal received by the receiving device 6 on the aircraft 4 or on the ground, and the power transmission status of the overhead power transmission line 2 can be grasped. In this case, the flying body 4 flying for the purpose of grasping the power transmission status of the overhead power transmission line 2 collects data by the above signal. A general air vehicle 4 including this can use the above signals only for an alarm system.

8) Part of the LED of the signal light may be an infrared LED, and an infrared sensor may be mounted on the flying body 4 to detect an infrared signal and issue an alarm.

9) In the configuration for calculating the shortest straight line distance from the flying object 4 to the overhead power transmission line 2, by applying this function, the current straight line distance to the overhead power transmission line 2 and the flight altitude can be used to determine which position on the map at present. You can instantly find out.

[0049]

The present invention exhibits the following excellent effects.

(1) Since the location of the overhead power transmission line is notified, it is possible to prevent contact accidents in the low sky, which frequently occur in the past.

(2) By using signals such as radio waves, infrared rays, and ultrasonic waves, which are more transparent than visible light and emit less radiation from the environment that is the background for the receiving side, day and night, weather, environment It will be available regardless of.

(3) Since the receiving device receives the signal and recognizes the location of the overhead power transmission line, the certainty is higher than that relying on the visual sense, and the overhead transmission which often occurs due to the carelessness of the operator in the past. Accidents with contact with electric wires are prevented.

(4) Since the signal transmission device is formed so as to be attached so as to surround and mount the overhead power transmission line, it can be easily installed in the existing overhead power transmission line.

(5) Since the signal transmitting device obtains operating power by induction from the power transmission current of the overhead power transmission line, it does not require a special power source and does not require wiring for power feeding, so that the structure is simple. It is small and can be installed anywhere on the overhead power transmission line safely and without losing its aesthetics, strength, etc. Furthermore, once installed, it does not require maintenance for a long period of time, and the power required for transmission is weak, so it consumes less power. Few.

[Brief description of drawings]

FIG. 1 is a perspective view of an overhead power transmission line and an aircraft equipped with an alarm system of the present invention.

FIG. 2 is a circuit diagram of a signal transmission device used in the alarm system of the present invention.

FIG. 3 is a side view of a signal transmission device used in the alarm system of the present invention.

FIG. 4 is a side view of another signal transmission device used in the alarm system of the present invention.

[Explanation of symbols]

 1 Power Transmission Tower 2 Overhead Power Transmission Line 3 Signal Transmitter 4 Aircraft 6 Receiver

Claims (5)

[Claims] 1. A signal transmission device for transmitting a signal notifying the whereabouts of an overhead power transmission line by radio waves is provided in the overhead power transmission line, a power transmission tower, or in the vicinity thereof, while the aircraft receives the above-mentioned signal and the An alarm system equipped with a receiver that recognizes whereabouts. 2. The alarm system according to claim 1, wherein infrared rays or ultrasonic waves are used for the signal. 3. A power supply unit for forming the signal transmission device so as to be attached to surround an overhead power transmission line so as to be separable, and providing the signal transmission device with operating power by induction from a transmission current of the overhead power transmission line. The alarm system according to claim 1 or 2, characterized in that 4. An induction coil for generating an induced current from a transmission current of an overhead power transmission line, a power supply circuit for supplying stable power based on the induced current, and a signal for informing the whereabouts of the overhead power transmission line using the stable power. And a holding member that is attached to an overhead power transmission line by combining a transmitter that transmits radio waves with two or more split bodies so as to surround the overhead power transmission line, and that holds at least the induction coil on the outer periphery of the overhead power transmission line. A signal transmission device comprising: 5. The signal transmission device according to claim 4, further comprising a signal lamp for indicating the location of the overhead power transmission line by using the stable power.