JP2927178B2 - Overhead transmission line alarm system and signal transmission device used for the same - Google Patents

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 recognizing a flying object to a flying object and preventing a contact accident. The present invention relates to a highly reliable overhead transmission line alarm system that can be used regardless of day, night, weather, and environment, and a signal transmission device used therefor.

[0002]

2. Description of the Related Art A high-rise building, a high-rise tower, or the like has a height of six.
It is well known that a building exceeding 0 m is required to be equipped with an aviation obstacle light in order to prevent a collision accident with an aircraft or the like. However, conventionally, there is no aviation obstruction light that can be installed by being attached to an overhead power transmission line, and therefore, no special aviation obstacle light is installed on the overhead power transmission line.
For this reason, a contact accident with the overhead transmission line is inevitable. Above all, accidents in which a helicopter or the like flying at low altitudes for the purpose of spraying pesticides, etc., crashes due to contact with an overhead power transmission line are unending. Regardless of the height of the overhead power transmission line, it is desirable to install an aviation obstruction light so that the aircraft can safely fly in the vicinity.

[0003] In view of the above requirements, a sign lamp that can be mounted on the overhead transmission line itself has been proposed. 4-53145
Japanese Patent Application Laid-Open Publication No. H11-163,086 discloses an overhead transmission line night marking device that causes an LED (light emitting diode) mounted on the overhead transmission line to emit light by induced current of the overhead transmission line.

[0004]

However, since the above-mentioned sign device notifies the existence of the overhead power transmission line by a light emission signal,
It is difficult to use in the daytime where the surroundings are bright, and it is difficult to use even in the nighttime in an environment where the emission signal is difficult to recognize due to the proximity of a city area or a road. Also, it is difficult to use it when the weather is bad such as dense fog.

[0005] By the way, many accidents in which a helicopter or the like crashes due to contact with an overhead power transmission line occur during a sunny day, and moreover, due to the carelessness of the pilot. That is, even if visibility is good, it is not easy to visually recognize the overhead transmission line.

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

Therefore, an object of the present invention is to solve the above-mentioned problems, prevent the contact accident of a flying object at a low altitude by notifying the location of an overhead power transmission line, and can be used regardless of day, night, weather and environment. An object of the present invention is to provide a highly reliable overhead transmission line alarm system and a signal transmission device used therefor.

[0008]

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

The signal may be infrared or ultrasonic.

The signal transmission device may be formed so as to be divided so as to surround the overhead power transmission line, and the power transmission unit may be provided in the signal transmission device to obtain operation power by induction from the transmission current of the overhead power transmission line. Good.

A signal transmission device used in the above-mentioned alarm system is an induction coil for generating an induction current from a transmission current of an overhead transmission line, a power supply circuit for supplying a stable power based on the induction current, and a power supply circuit using the stable power. A transmitter for transmitting a signal indicating the location of the overhead transmission line by radio waves, and a split body composed of two or more divided bodies so as to surround the overhead transmission line, attached to the overhead transmission line, and transmitting at least the induction coil by overhead transmission And a holding member for holding the outer periphery of the electric wire.

[0012] The signal transmission device may include a signal light for notifying the location of the overhead transmission line using the stable power.

[0013]

According to the above construction, the overhead transmission line, the power transmission tower, or a signal transmission device provided in the vicinity thereof transmits a signal indicating the location of the overhead transmission line by radio waves. On the other hand, the receiving device mounted on the flying object receives the signal and recognizes the location of the overhead transmission line. This alert system alerts the operator and can reliably avoid the overhead transmission line even when it is not visible. Since the location of the overhead transmission line is notified using radio waves, it can be used regardless of day, night, weather, or environment.

The signal transmitted from the transmitter can use infrared rays or ultrasonic waves in addition to radio waves. Even in the case of using infrared rays or ultrasonic waves, as in the case of using radio waves, it has better transparency than visible light, and it is easy to recognize because there is less radiation from the background environment for the receiving side .

The type and frequency of the signal should be such that there are few noises in the environment where the alarm system is placed, and that there are few other signals that cause interference, and that the environment does not adversely affect the environment such as radio interference. You will have to choose
I can not specify.

The output of the signal transmitted from the transmitter (or the reach of the signal) is weak enough to avoid interference with the signal from a similar signal transmitting device installed in another place, and also fly near. 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 flying vehicle expected to fly in the vicinity.

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

It is preferable that the signal transmission device be installed on the overhead transmission line itself and mounted directly on the overhead transmission line. In addition, it is important to be able to attach to existing overhead transmission lines. For this purpose, the signal transmitting device is formed so as to be splittable.
Surround the overhead transmission line with the divided signal transmission device, combine and attach to the overhead transmission line. As a result, the overhead transmission line can be mounted without any modification, and can be easily attached and detached.

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 for obtaining operating power by induction from the transmission current of the overhead transmission line. The power supply unit can be used permanently because it obtains the operating power from the transmission current.

Next, in the signal transmission device used in the alarm system, the induction coil generates an induction current from the transmission current of the overhead transmission line. The power supply circuit supplies stable power based on the induced current. This stable power is the operating power of the signal transmission device. Therefore, even if the transmission current fluctuates, the signal transmission device operates stably without being affected by the fluctuation. Then, the transmitter uses this stable power to transmit a signal that indicates the location of the overhead power transmission line by radio waves, so that the strength, the reach, and the frequency of the radio waves are stably maintained, and regardless of the fluctuation of the transmission current, it is always reliable Alarm system is available.

Further, the holding member is composed of two or more divided bodies and is combined with the divided bodies so as to surround the overhead transmission line, and is attached to the overhead transmission line. That is, the signal transmission device is formed so as to be splittable and attached to the overhead transmission line. This holding member holds the induction coil on the outer periphery of the overhead power transmission line. Since the induction coil is held on the outer circumference of the overhead power line,
Induction current can be generated efficiently.

The signal transmitting 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 transmission line. In this case, since the alarm system is activated by the signal of the transmitter, it is possible to pay attention to the signal lights, and it is possible to find the overhead transmission line that was previously overlooked, while visually checking the overhead transmission line. This can be reliably avoided.

[0023]

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

As shown in FIG. 1, in the alarm system of the present invention, an overhead transmission line 2 installed on a power transmission tower 1 is provided.
One signal transmission device 3 is mounted for each of the spans (between power transmission towers). The signal transmission device 3 is disposed substantially at 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 operation power by induction from a transmission current of the overhead transmission line and a transmission unit 22 for transmitting a signal indicating the location of the overhead transmission line. Consists of In this embodiment, radio waves are used for signals. The power supply unit 21 includes an induction coil 23 that is disposed around the overhead power transmission line and generates an induction 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 induction 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 a voltage and a current, and can supply a constant voltage and a constant current without being affected by fluctuations of a transmission current. Here, the output of the power supply unit 21 is set to a voltage / current DC of 12 V and 0.5 A.
The transmitting unit 22 includes a transmitter 25 that transmits a signal indicating the location of the overhead transmission line by radio waves using the stable electric power, and an antenna 26. The transmission output of the transmitter 25 is 200 mW,
The transmission frequency is 27 MHz, and the signal waveform is a pulse. The reach of this signal is about 500 m in a straight line. The reason why the signal waveform is a pulse is to improve signal separation from noise. Further, another frequency is used for another signal transmission device 3 installed within 500 m, which is the reach 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 portion 32 containing the induction coil 23, and an antenna 26.
And a transmission ring 33 accommodating the power supply circuit 24 and the transmitter 25. The clamps 31 are provided at both ends. The clamp 31 is fixed to the overhead transmission line 2, and the induction coil section 32 and the transmitting section 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 portion to which the weight 34 is attached is positioned below by the weight. The antenna 26 is mounted on the opposite side of the weight 34 and can always be kept perpendicular to the ground.

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

Returning to FIG. In this embodiment, a small helicopter 5 is used as the flying object 4. Small helicopter 5
The receiving device 6 mounted on the vehicle receives the signal and recognizes the location of the overhead transmission line. In this embodiment, when the signal by the radio wave is received, the overhead transmission line is close to the pilot. In addition to generating an alarm sound to the effect, a lamp installed in the cockpit is turned on and blinking to give a warning. In addition, a signal having the largest intensity among the received signals is separated, an approximate distance from the small helicopter 5 to the signal generator 3 is calculated based on the signal intensity, and the operator is notified by a numerical sign. Also do things. Further, the distance to each of the signal transmission devices 3 is calculated based on the plurality of received signals. The distances between the transmitting devices 3 are obtained, and from these distance relationships, the small helicopter 5 and the overhead transmission line 2 are used.
It also calculates the shortest straight line distance up to and informs the pilot. 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 determined, a triangular shape having the small helicopter 5 and the two signal transmitting devices 3 as vertices is obtained. The vertical line is the shortest straight line distance.

Next, the operation of the embodiment will be described.

Each of the signal transmission devices 3 attached to each span of the overhead power transmission line 2 obtains operating power by induction from a transmission current and transmits a signal indicating the location of the overhead transmission line by radio waves. The signal transmission devices 3 that are within the range in which the reach of the signal is considered transmit signals at different frequencies.
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 generating device 3 which has obtained the signal having the highest intensity among these signals is calculated, and the operator is informed by numerical display. Further, the distance to each of the signal transmitting devices 3 is calculated based on the plurality of received signals. On the other hand, the distance between the signal transmitting devices 3 is calculated based on the overhead wiring diagram of the overhead transmission line in the flight area stored in a computer in advance. From these distance relationships, the overhead transmission line 2 from the small helicopter 5 is calculated.
Calculate the shortest straight line distance to and inform the pilot.

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

The small helicopter 5 was flown 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 540m. The signal reception strength depends on the attitude of the small helicopter 5 and the overhead transmission line 3
It is difficult to accurately calculate the distance from the received signal because it slightly fluctuates depending on the positional relationship with the above, but it was successfully calculated within an error range of ± 20 m.

Next, another embodiment will be described.

In the signal transmitting device 3 shown in FIG. 4, a signal lamp 41 is provided between two clamps 31 and two induction coil units 32. The clamp 31 and the induction coil part 32 are the same as those in FIG. Signal light part 41
Is formed in a two-part cylindrical shape, houses the power supply circuit 24 inside, and has a number of LEDs on the surface. These LEDs emit light by using the stable power of the power supply circuit 24 to notify the location of the overhead power transmission line. Signal light part 41
Is rotatable around the overhead power transmission line 2 and has a transmitter 42 on one side. Even if the overhead power transmission line 2 is twisted or shaken 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. The transmitter 25 is accommodated in the transmitter 42, and a two-element antenna 43 is mounted horizontally.

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

Using this configuration, it was confirmed that the performance of the signal by radio waves was equivalent to that obtained in the operation test in the previous period. Regarding the performance of the signal by the LED, when the weather was fine at night, the emission of the LED could be confirmed from a position 1 km away in a linear distance.

In each of the above embodiments, the signal transmission device 3 is installed at the center of the span of the overhead power transmission line 2, but may be provided near the power transmission tower 1 or the overhead power transmission line 2 or the power transmission tower 1.

In each of the above embodiments, the signal is transmitted by radio waves or infrared rays, but an ultrasonic wave may be used. Even in the case of ultrasonic waves, the output intensity is set in consideration of the reach, and a plurality of 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 include information such as the height of the overhead transmission line 2, the direction of the overhead line, and the position on the map. The receiving device 6 of the flying object 4 reads the information, and knows its height, direction, and position on the map from the position relative to the overhead power transmission line 2, and can use it for safe flight.

2) The distance between the flying object 4 and the overhead power transmission line 2 may be obtained from the intensity of the signal received by the receiving device 6.
As described in the embodiment, the distance to the signal transmitting device 3 is calculated from the signal strength, and the signal transmitting device 3 is calculated from the overhead wire layout diagram.
When the distance between them is determined, the shortest linear distance to the overhead transmission line 2 can be calculated. By notifying the operator of this with a numerical sign, it is possible to prompt an appropriate avoidance action.

3) The receiving device 6 includes the continuous overhead transmission line 2
, The signals from two or more signal transmission devices 3 installed in the overhead transmission line 2 may be detected to determine the overhead line direction of the overhead power transmission line 2. That is, 2
Using the distance to the signal transmission device 3 described above, it is possible to know that the overhead transmission line 2 is on a line connecting these signal transmission devices 3.

4) At least a part or all of the signal transmission device 3 including the antenna is rotatable with respect to the overhead power transmission line 2, and the antenna maintains a fixed direction even if the overhead transmission line 2 is twisted or shaken. You may do so. The slip ring 35 and the signal light unit 41 used in the embodiment may be used, or another configuration may be used.

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

6) The signal from the signal transmission device 3 may have directivity. For example, the signal in the vertical direction of the overhead power transmission line 2 is weakened and the signal in the horizontal direction is strengthened, thereby preventing radio interference to houses and facilities on the ground. For this purpose, the antennas 26 and 43 have directivity. in this case,
Flying vehicle 4 flying above the overhead power transmission line 2
Although the signal does not reach the vehicle 4, the signal reaches the flying object 4 performing low altitude flight which has a risk of contacting the overhead power transmission line 2.

7) The signal transmission device 3 not only obtains operating power by induction from the transmission current, but also obtains data on the power transmission status from the current, voltage, etc. of the induction current, and puts this data on the signal to be transmitted. Is also good. Thereby, data can be read from the signal received by the receiving device 6 on the flying object 4 or on the ground, and the power transmission status of the overhead transmission line 2 can be grasped. In this case, the flying object 4 flying for the purpose of grasping the power transmission status of the overhead power transmission line 2 performs data collection based on the signal. A general flying vehicle 4 including this can use the above signal only for an alarm system.

8) A part of the LED of the signal light may be an infrared LED, an infrared sensor may be mounted on the flying object 4, and an alarm may be issued by detecting the infrared signal.

9) In the configuration for calculating the shortest straight line distance from the flying object 4 to the overhead transmission line 2, this function is applied to determine the current position on the map from the shortest straight line distance to the overhead transmission line 2 and the flight altitude. Can be determined instantaneously.

[0049]

The present invention exhibits the following excellent effects.

(1) Since the location of the overhead transmission line is notified, it is possible to prevent a contact accident in a low altitude, which has conventionally occurred frequently.

(2) By using signals such as radio waves, infrared rays, and ultrasonic waves, which have higher transparency than visible light and emit less radiation from the background environment for the receiving side, day and night, weather, and environment It can be used regardless of.

(3) Since the signal is received by the receiver and the location of the overhead transmission line is recognized, the reliability is higher than relying on the visual sense, and the overhead transmission which has conventionally occurred often due to the carelessness of the operator A contact accident with the electric wire is prevented beforehand.

(4) Since the signal transmitting device is formed so as to be divided so as to surround the overhead transmission line, it can be easily installed on the existing overhead transmission line.

(5) Since the signal transmission device obtains the operating power by inducing from the transmission current of the overhead transmission line, no special power supply is required, and no wiring for power supply is required. It is small and can be installed anywhere on the overhead power transmission line without sacrificing beauty, strength, etc.Furthermore, once installed, it does not require maintenance for a long time, and the power required for transmission is weak, so power consumption is also small. Few.

[Brief description of the drawings]

FIG. 1 is a perspective view of an overhead power transmission line and a flying object 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]

 DESCRIPTION OF SYMBOLS 1 Transmission tower 2 Overhead transmission line 3 Signal transmission device 4 Flying object 6 Receiving device

Claims (5)

(57) [Claims] 1. An overhead transmission line, a transmission tower or a vicinity thereof are provided with a signal transmitting device for transmitting a signal indicating the location of the overhead transmission line by radio waves. An alarm system comprising a receiving device for recognizing a location. 2. The alarm system according to claim 1, wherein an infrared ray or an ultrasonic wave is used for the signal. 3. The signal transmission device is formed so as to be divided so as to be mounted around an overhead power transmission line, and the signal transmission device is provided with a power supply unit for obtaining operating power by induction from a transmission current of the overhead power transmission line. The alarm system according to claim 1 or 2, wherein: 4. An induction coil for generating an induction current from a transmission current of an overhead transmission line, a power supply circuit for supplying a stable power based on the induction current, and a signal indicating the location of the overhead transmission line using the stable power. And a holding member for holding the induction coil at least on the outer periphery of the overhead transmission line by attaching the splitter to the overhead transmission line by combining the transmitter so as to surround the overhead transmission line, the transmitter comprising two or more divided bodies, And a signal transmitting device. 5. The signal transmission device according to claim 4, further comprising a signal light for notifying the location of the overhead transmission line using the stable power.