JP3021081B2 - Overhead wire flaw detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead wire flaw detector for detecting a flaw in an overhead wire such as a high-voltage transmission line.

[0002]

2. Description of the Related Art A high-voltage transmission line is formed by twisting a number of strands. Damage to these wires or breakage of any of them due to wind vibration or various natural disasters may cause power loss by corona discharge or cause various accidents. . Therefore, an overhead wire flaw detector is used to periodically inspect the outer surface of the overhead wire. FIG. 3 shows a side view of a conventionally known overhead wire flaw detector. In the figure, this overhead wire flaw detector 1
Is accommodated in a frame 2, and a pair of wheels 3 is attached to the front and rear of the frame 2. The wheel 3 is configured to travel on an overhead line 4. Each wheel 3
Are driven by the motor 5 via the chains 6 and 7. As a result, the apparatus travels on the overhead line 4 in the direction of arrow 8, and an obstacle sensor 9 is provided to detect various obstacles attached to the overhead line 4. A flaw detector 11 and a controller 12 are housed inside the frame 2. The flaw detection unit 11 is mounted with a flaw detection coil described later.

As described above, when the apparatus 1 travels on the overhead wire 4 and the flaw detector 11 detects a flaw on the overhead wire 4 by, for example, eddy current, the controller 12 records or stores the detection signal. The data is stored in the device, and the data is transmitted to a receiving device on the ground. On the other hand, in order to actually recognize such a wound with the naked eye, a photographing machine 13 for photographing the wound is attached. As shown in FIG. 4, a roof-shaped mirror 14 is arranged just above the photographing machine 13 so as to cover the overhead line 4. As a result, the rear surface of the overhead line 4 is projected onto the mirror 14, and the photographing device 13 can photograph the entire circumference of the overhead line 4.

[0004]

[SUMMARY OF THE INVENTION Incidentally, as a configuration <br/> flaw detection portion 11 shown above, consider having a structure shown in FIG. 5
Have been. That is, as shown in FIG. 5 (a), the outside of the overhead line 4, for example, four flaw detection coils 16A, 16
B, 16C, and 16D are arranged point-symmetrically around the overhead line 4.
And, further, for the convenience of mechanism or other arrangement for supporting the respective coils, the pair of inspection coils arranged in symmetrical positions about the overhead line 4 as one set, these in the longitudinal direction of the overhead line 4 Attempts have been made to displace them from each other
You. That is, as shown in FIG. 5 (b), a pair of flaw detection coils 16A, 16C was placed in approximately the same position about the overhead line 4, the remaining pair of flaw detection coil 16B it than the distance X apart position, 16D is arranged.

When the apparatus shown in FIG. 3 travels in the direction of arrow 8 and one of the flaw detection coils detects a flaw on the overhead wire 4, after traveling for a certain distance after the detection, the camera shown in FIG. 13 is controlled to operate the shutter. That is, when the flaw detection coil of the flaw detection unit 11 detects a flaw in the overhead wire 4, when the flaw reaches the vicinity of the center of the mirror 14, if the shutter of the photographing machine 13 is operated, the flaw can be clearly photographed. However, as shown in FIG. 5, for example, all four flaw detection coils 16 </ b> A to 16 </ b> D are not at the same position in the longitudinal direction of the overhead wire 4. Therefore,
The position of the flaw in the photographed image is not always constant depending on the coil that has detected the flaw. Therefore, there is a problem that it is relatively difficult to match the electric signal at the time of flaw detection recorded in the control unit 12 shown in FIG. 3 with the photographed photograph of the flaw.

[0006] While the example shown in FIG. 5 is an example using four flaw detection coils, when placing the six flaw detecting coil to the radiation shape, to prevent interference between the flaw detection coils mutually flaw detection The coils must be displaced in the longitudinal direction of the overhead wire, so that the front end flaw detection coil and the rear end flaw detection coil are, for example, displaced by about 200 mm in the longitudinal direction. Become. Therefore, the position of the flaw in the image that fits in the photograph will fluctuate further back and forth. Also,
In order to absorb the shift in the shooting timing, it is necessary to increase the length of the electric wire that fits in the photograph. Therefore, it is necessary to widen the field of view of the camera by increasing the distance between the camera and the electric wire or using a wide-angle lens. However, this method has a problem that a flaw on the overhead line cannot be photographed greatly, and its analysis becomes difficult. The present invention has been made by paying attention to the above points, and an object of the present invention is to provide an overhead line flaw detector capable of accurately and clearly photographing a flaw on an overhead line detected by a flaw detection coil. is there.

[0007]

SUMMARY OF THE INVENTION An overhead line flaw detector according to the present invention is provided with a traveling mechanism that travels on an overhead line, and is arranged along the periphery of the overhead line and displaced in the longitudinal direction thereof. A plurality of flaw detection coils, a photographing machine mounted on the traveling mechanism for photographing the outer surface of the overhead wire, and a distance data storage storing distance data indicating a distance between each of the flaw detection coils and the photographing machine. And receiving the output signal of any one of the flaw detection coils, comparing the corresponding distance data stored in the distance data storage unit with the travel distance of the traveling mechanism, and determining that the traveling mechanism is based on the distance data.
When traveling by Ku distance, a travel distance determining circuit for outputting a photographing command signal, when receiving the photographing instruction signal, and characterized by comprising an imaging control unit for driving the shutter of the imaging machine.

[0008]

In this device, when any one of the plurality of flaw detection coils detects a flaw in the overhead wire, the shooting timing is set in accordance with the distance data between each flaw detection coil and the photographing device stored in the storage unit in advance. Therefore, regardless of which flaw is detected by any of the flaw detection coils, the flaw is always projected almost at the center of the photographed image, and the photographer is brought close to the overhead line to take a precise photograph.
It becomes possible that.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows a circuit block diagram used for the overhead line flaw detector of the present invention. This circuit is housed inside the control unit 12 shown in FIG. 3, and is provided for each of a plurality of flaw detection coils. These flaw detection coils are fictitious
Along the circumference of the wire, eg, at 90 ° intervals, and overhead wires
Are displaced in the longitudinal direction. In the following description of the embodiment, an apparatus having four flaw detection coils will be described.
6A, the B coil 16B, the C coil 16C, and the D coil 16D will be described. The circuit shown is an A coil 1
It has a waveform shaping section 21 that receives the output of 6A, a comparison / determination section 22 that receives the output, and compares it with the output of a set value register 23, an AND gate 24, a subtraction counter 25, and a distance data storage section 26. The subtraction counter 25 is connected so that a count pulse is input from an encoder 27 that detects the rotation of the wheel 3. The output of the subtraction counter 25 controls the operation of the imaging control unit 28,
The photographing control unit 28 has a circuit configuration that controls the shutter of the photographing machine 13 to operate by a signal input from the subtraction counter 25. In addition, AND gate 24, reduced
The arithmetic counter 25 and the encoder 27 are used to calculate the traveling distance of the present invention.
It constitutes a judgment circuit.

The illustrated circuit operates as follows. When detecting the flaw on the overhead wire, the A coil 16A outputs a pulse-like electric signal. The waveform shaping section 21 is a circuit having a well-known configuration for shaping the electric signal into a pulse-like electric signal corresponding to the signal level. The setting value register 23 stores
The signal which is slightly lower than the signal level output when the coil 16 </ b> A actually detects the flaw is configured to be output to the comparison determination unit 22. As a result, noise and the like are removed, and the comparison / determination unit 22 outputs the A coil 16
When A detects a flaw, a signal that becomes high level is output. The output of the comparison / determination unit 22 is input to an AND gate 24 and also to a load terminal of a subtraction counter 25.

On the other hand, the output signal of the distance data storage unit 26 is input to the AND gate 24. The distance data storage unit 26 stores data corresponding to the distance between the A coil 16A and the photographing device 13. This data is composed of, for example, a digital signal of about 4 bits. When the output of the comparison / determination unit 22 input to the AND gate 24 becomes high level, the distance data is input to the subtraction counter 25. At this time, since the output of the comparison / determination unit 22 is simultaneously input to the load terminal of the subtraction counter 25, the subtraction counter 2
5, the signal output from the distance data storage unit 26 is loaded. On the other hand, when the wheel 3 rotates by a predetermined angle, one pulse is input from the encoder 27 to the subtraction counter 25.

Accordingly, when the device runs and the wheels 3 rotate, the number of pulses corresponding to the running distance is input to the subtraction counter 25. The subtraction counter 25 determines that this pulse is 1
Each time the number is input, the distance data is decremented by one. As a result, when the apparatus has just traveled the distance corresponding to the distance data, the output of the subtraction counter 25 becomes 0, and then a borrow signal is output to the imaging control unit 28. The photographing control unit 28 operates the shutter of the photographing machine 13 at the timing when this signal is input. Thereby, the A coil 16
A detects a scratch on the overhead line, and the device detects the distance data storage unit 2
After the vehicle has traveled a certain distance stored in No. 6, shooting is performed. Therefore, the photographing machine can clearly photograph the flaw detected by the A coil exactly in the center of the photograph. If the circuit as described above is provided for each of all the coils, after the optimal mileage for each coil,
The shutter of the camera is activated, and you can always take clear pictures of scratches on the overhead line in front.

FIG. 1B shows a block diagram of such an entire circuit. As shown in FIG.
1 includes a circuit from the waveform shaping unit 21 to the subtraction counter 25 shown in FIG. 1A. The control units 30B, 30C, and 30D have the same configuration. Are output in parallel to the shooting control unit 28, respectively.
Is connected to input. The imaging control unit 28 receives a signal input from any of the coil control units, and performs the imaging operation of the imaging device 13 at that timing.

Here, after one flaw detection coil detects a flaw on the overhead line, before the photographing machine 13 takes a picture of the flaw, the same flaw detection coil may detect another flaw. In such a case, only the circuit shown in FIG. 1 rewrites the contents of the subtraction counter each time, and cannot photograph all the scratches. FIG. 2 shows an apparatus block diagram of a configuration capable of photographing such a plurality of flaws. The AND gate 24 in the figure and the distance data storage unit 2
The configurations of the camera 6, the photographing control unit 28, and the photographing machine 13 are the same as those shown in FIG. Here, the output of the AND gate 24 is input to a counter selection unit 32, and the first subtraction counter 25-1, the second subtraction counter 25-2, or the third subtraction counter 25-2 is input via the counter selection unit 32.
Wired to input to 25-3. Counter selection unit 3
Reference numeral 2 denotes a circuit which operates in the same manner as, for example, a rotary switch, and is connected so that when distance data is first input from the AND gate 24, the signal is input to the first subtraction counter 25-1. Then, the first subtraction counter 25
When the loading to -1 is completed, the output direction of the counter selection unit 32 is switched to the second subtraction counter 25-2.

Accordingly, immediately after the distance data is input via the AND gate 24, the distance data is input to the second subtraction counter 25-2. When the loading is further completed, the counter selecting section 32 outputs the third subtraction counter 25-3.
Switch the output direction to. By performing such an operation, the three subtraction counters 25-1, 25-2, and 25-3 are sequentially switched and used, and even if three flaws are continuously detected by one flaw detection coil, no leakage occurs. Shooting can be performed. If the number of the subtraction counters shown in FIG. 2 is increased, it goes without saying that a larger number of flaws can be continuously photographed. The present invention is not limited to the above embodiments. The circuit that processes the output of the flaw detection coil, the configuration of the storage unit that stores the distance data, the method of controlling the photographing using the distance data, and the like may be replaced with various circuits having equivalent functions.

[0016]

As described above, in the overhead line inspection apparatus of the present invention, a plurality of inspection coils are displaced in the longitudinal direction of the overhead line.
Even if they are arranged in the same manner, the flaw detected by each coil can always be photographed in the center of the photograph. Therefore, it is possible to bring the photographing machine closer to the overhead line, accurately photograph the flaw, and facilitate the work of analyzing the flaw.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a circuit used for an overhead line flaw detector according to the present invention, in which (a) is a main part thereof and (b) is an overall block diagram thereof.

FIG. 2 is a block diagram showing a modified example of the device of the present invention.

FIG. 3 is a side view of a conventional overhead wire inspection device.

FIG. 4 is a sectional view taken along the line YY of FIG. 3;

FIG. 5 shows a relationship between a flaw detection coil and an overhead wire.
(A) is a front view, (b) is a side view.

[Explanation of symbols]

 Reference Signs List 3 Wheels (part of traveling mechanism) 13 Camera 16A A coil (flaw detection coil) 16B B coil (flaw detection coil) 16C C coil (flaw detection coil) 16D D coil (flaw detection coil) 21 Waveform shaping unit 22 Comparison judgment unit 23 Setting Value register 24 AND gate 25 Subtraction counter 26 Distance data storage unit 28 Imaging control unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-314113 (JP, A) JP-A-2-114807 (JP, A) JP-A-2-214403 (JP, A) 192614 (JP, U) JP-A 62-25849 (JP, U) JP-A-3-120609 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 1/00-1 / 10 B60M 1/28

Claims (1)

(57) [Claims] 1. A traveling mechanism traveling on an overhead line, a plurality of flaw detection coils mounted on the traveling mechanism and arranged along the periphery of the overhead line and displaced in a longitudinal direction thereof, and mounted on the traveling mechanism. A photographing machine that photographs the outer surface of the overhead wire, a distance data storage unit that stores distance data indicating a distance between each of the flaw detection coils and the photographing machine, and an output signal of any one of the flaw detection coils. receiving the compares the travel distance of the corresponding distance data and the running mechanism stored in the distance data storage section, the running mechanism the distance
When traveling distance based on the data, a travel distance determining circuit for outputting a photographing command signal, when receiving the photographing instruction signal, the shutter of the imaging device
An overhead line flaw detection device, comprising: a photographing control unit for driving the apparatus.