JPH0676996B2 - Flaw detection equipment for overhead lines - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a deep scratching device for detecting scratches, disconnections, and the like of overhead wires.

(Technical background of the invention) Since overhead power transmission lines and overhead ground lines are often laid in high places such as mountains, lightning may cause the wires to melt or melt. Further, the overhead wires may be scratched or broken due to long-term use.

For this reason, conventionally, an operator has inspected the overhead wire in a straight line visually or through binoculars, but it is impossible to inspect the entire peripheral surface of the overhead wire in a mountain area or the like.

Therefore, recently, there has been a deep damage device for overhead wires (Japanese Patent Laid-Open No. Sho 60-1194).
No. 76 gazette) is attached, and while the deep scratching device is running on an overhead wire, scratches or breaks in the wires are detected. That is, as shown in FIG. 9, this deep wound device includes a traveling roller 1 that engages with an overhead wire 4 and a coil holder 3 in which a plurality of detection coils 2 are arranged and the overhead wire 4 is passed. Each of the detection coils 2 electromagnetically detects a scratch or a break in the wire of the overhead wire 4 while moving along the overhead wire 4 via the traveling roller 1. On the other hand, a casing 5 is supported below the coil holder 3, and a deep wound circuit 6, a recording unit and the like are accommodated in the casing 5. The detection signal of each detection coil 2 is input in parallel to this deep wound circuit 6, and the phase of each detected signal and the phase of each detected signal are detected by the signal-to-noise (S / N) ratio. Has a phase shifter that rotates so as to maximize, and a gain adjuster that sets the gain of each phase-shifted rotated signal.

(Problems of Background Art) By the way, the respective detection coils 2 have different detection sensitivities. In addition, experiments have shown that the phase rotation angle and gain of the detection signal that maximizes the S / N ratio differ depending on the type and diameter of the overhead wire to be deeply damaged. Therefore, in the above-described deep scratch device, the overhead wire to be deeply damaged, for example, when the steel core aluminum twisted wire is changed to an Almoweld wire or an optical fiber composite overhead ground wire, or the wire diameter of the overhead wire to be deeply damaged is changed. In such a case, it is necessary to finely adjust the phase setting value of the phase shifter and the gain setting value of the gain adjuster in the deep wound circuit by pinching or the like. However, since this fine adjustment work is extremely difficult, it requires a great deal of skill and a great deal of time and effort.

(Object of the Invention) An object of the present invention is to eliminate the need for fine adjustment work of the deep wound circuit and accurately confirm the damaged position even if the type and diameter of the overhead wire to be deeply damaged changes. It is intended to provide a deep wound device for overhead power lines.

(Summary of the Invention) According to the present invention, a deep wound circuit is connected to each of a plurality of detection coils, and phase setting data and gain setting data corresponding to the type and diameter of an overhead wire are obtained based on each detection coil and circuit characteristics. The phase setting data and the gain setting data, which are stored in the phase control recording unit and the gain control storage unit respectively, and correspond to the overhead wires in both storage units by the selection signal of the switching unit, are stored in the phase shifter of each deep wound circuit. The detection signal is output to the gain adjuster to correct the detection signal, and the detection signal with the highest level is selected from the corrected detection signals and recorded on the recording medium. The image of the surface is reflected by the reflecting member, and the camera is operated based on the selection detection signal to take a picture, and the traveling distance of the device is measured, and the traveling distance is recorded on the recording medium as traveling position data. The recording medium is recorded, and a shutter drive signal indicating a damaged position on the traveling data is recorded on the recording medium.

Embodiments of the Invention Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 6, the deep wound device for overhead electrical wires according to the present invention includes a pair of traveling rollers 10, 10. These running rollers 10, 10 are engaged on the overhead wire 4,
It is fixedly attached to shafts 10a, 10a that rotatably pass through an upper portion of a substrate 28 arranged along the up-down direction.
A sprocket 11 is attached to each shaft 10a, and another sprocket 12 is arranged between the sprockets 11, 11. The sprocket 12 is attached to the input shaft of the encoder 13 via a gear mechanism. The geared motor 14 is fixed to the lower portion of the board 28, and the sprocket 14a is attached to the output shaft of the geared motor 14. A chain 15 is wound around the sprockets 11, 11, 12, 14a. Therefore, when the geared motor 14 is driven, the sprockets 11 and 1
Since 1 rotates, the traveling rollers 10 and 10 are rotationally driven,
The deep wound device of the present invention moves on the overhead wire 4 in the direction of the arrow. Further, since the sprocket 12 also rotates with this movement, the encoder 13 outputs the number of pulses corresponding to the moving (traveling) distance.

A cylindrical coil holder 16 is arranged between the traveling rollers 10, 10. As shown in FIGS. 7 (A) and 7 (B), this coil holder 16 has two split structures composed of holder halves 16A and 16B, and the ends of the holder halves 16A and 16B on the substrate 28 side are The hinges 17 are integrated with each other via a hinge 17, and a closing locking member 18 is attached to the opposite end. The holder halves 16A and 16B have recesses with a semicircular cross section at the center thereof, and these recesses form through holes 16C for passing the overhead wire 4. Bushings 21 are bolted to both end surfaces of the upper holder half portion 16A so as to set the entrance / exit diameter of the through hole 16C corresponding to the outer diameter of the overhead wire 4.

The suspension shafts 19 and 19 extend upward from the upper surface of the holder half portion 16A. These suspension shafts 19, 19 are fitted with brackets 20, 20
Is inserted into each of the distal end tube portions 20a, 20a so as to be vertically movable, and a stopper member 19a is attached to the upper end. Each bracket 20
The base is bolted to the substrate 28. Therefore, when the overhead wire 4 is passed through the through hole 16C of the coil holder 16,
Since the bushes 21 and 21 are in contact with the peripheral surface of the overhead wire 4, the bushes 21 and 21 move upward through the hanging shafts 19 and 19 so that the center line of the through hole 16C is aligned with the center axis of the overhead wire 4. Retained. The holder halves 16A and 16B are provided with six angular coil holes 22 which are displaced from each other every 60 degrees. These coil holes 22 extend in the radial direction of the holder 16 and are through holes.
It communicates with 16C. Each coil hole 22 has a stopper member 2
The attached detection coil 23 of 9 is movably fitted and is closed by a holding plate 24. A coil spring is placed at the center of the surface where the pressing plate 24 and the stopper member 29 face each other.
25 are arranged. Therefore, each detection coil 23 is constantly pressed against the peripheral surface of the overhead wire 4 by the elastic force of the coil spring 25.

As shown in FIG. 6, the lower end of the support column 30 is fixed to the upper rear part of the board 28 in the traveling direction via a fixing member 31. As shown in FIG. 6, a slide body 32 is slidably fitted to the support column 30, and the slide body 32 is fixed to the upper end of the support column 30 by screwing the screw portion of the knob 33. A support plate 34 extends horizontally from the sliding body 32, and the support plate 34 has a camera for photography.
35 is installed. The lens side of the camera 35 is located below and faces the overhead wire 4. A solenoid 37 is fixed to the support plate 34. One end of a switch plate 38 is fixed to the movable piece 37a of the solenoid 37, and the other end of the switch plate 38 is locked to the shutter 35a of the camera 35. Therefore, when the solenoid 37 is driven and the movable piece 37a retracts, the shutter 35a is pressed, so that the camera 35 operates and photographs the peripheral surface of the overhead wire 4.

On the other hand, at the lower rear part of the board 28 in the traveling direction, a fixing member 31 ′ is provided.
A reflecting member 39 is attached via a support plate 34 'fixed by. As shown in FIG. 8, the reflecting member 39 has a V-shaped cross section, and has reflecting surfaces 39a and 39b formed inside. The focus f located on the alternate long and short dash line of the camera 35 is slightly deviated from the central axis of the overhead wire 4, and the intersection of the reflecting surfaces 39a and 39b of the reflecting member 39 is located on the extension line of the focus f. It is located in a square state with the central axis of. Therefore, the lens of the camera 35 to the outside of the image X ₁ of the upper peripheral surface portion of the overhead wire 4, the image X ₂ each side peripheral surface, X ₃ and image X ₄ of the lower peripheral surface portion is reflected. Therefore, it is possible to take a picture of the entire peripheral surface of the overhead wire 4 with one camera 35.

A housing 27 is supported below the substrate 28 via an L-shaped support 26. Inside the housing 27, a drive unit, a recording unit, a receiver, an exciting circuit 52 described below, and a deep wound circuit. 60 、 Signal processing circuit
40, the camera operating circuit 41, etc. are housed, and when the drive signal is received by the receiver, the drive unit drives the geared motor 14 to rotationally drive the traveling rollers 10, 10.

The excitation circuit 52 is a crystal oscillator, as shown in FIG.
53 and frequency divider 54, the crystal oscillator 53, for example, 2.04
The 8 MHz square wave is output, and the frequency divider 54 divides this square wave into, for example, 31.25 KHz. The divided square wave is input to the sine filter 55, and the sine wave Sm ₁ with a 90-degree phase difference is used. , S
Waveform is shaped to m ₂ . The sine wave Sm ₁ is generated by the amplifier 56.
For example, the peak-peak value is amplified to 4V and is supplied to each detection coil 23 as an excitation signal Se in a time division manner. As shown in FIG. 3 (B), each of the detection coils 23 has coil portions 23A and 23B embedded in an imide resin, and the coil portions 23A and 23B are connected to the strands of the overhead electric wire 4 during running of the deep wound device of the present invention. When there are scratches, disconnections, etc., the difference voltage between the detection voltages is output as the detection signals S _{1 to} S ₆ . The sine waves Sm ₁ and Sm ₂ are amplified by the buffer amplifiers 58 and 59 and supplied to each deep wound circuit 60 as a reference signal for phase detection.

Now, as shown in FIG. 1, each of the detection coils 23 is connected with a plurality of deep wound circuits 60. Each deep wound circuit 60
As shown in FIG. 2, an amplifier 61 in the front stage, a bandpass filter 62 having a central currency frequency of 32 KHz, and an amplifier 6 in the rear stage are shown in FIG.
3, and phase detectors 64A and 64B are connected in parallel to the output side of the amplifier 63. Since the sine waves Sm ₁ and Sm ₂ are supplied to the phase detectors 64A and 64B, the detection signal S _{1 and the} like are detected at a phase angle of 90 degrees. A carrier filter 65 that removes unnecessary frequencies on the output side of each phase detector 64A, 64B
Is connected to the output side of carrier filter 65
Are connected. The phase shifter 66 changes the phase of the detection signal from 0 to 35.
It rotates in the range of 9 degrees. A voltage gain adjuster 68 is connected to the output side of the phase shifter 66 via a DC component removing capacitor 67. The voltage gain adjuster 68 digitally sets the gain in the range of 0 to 39 dB, and a notch filter 69, a bandpass filter 70 and a full wave rectifier 71 are connected in this order to the output side thereof. The notch filter 69 reduces commercial frequency noise of the current flowing through the overhead wire 4.

A ROM 72 for phase control is connected to the control terminal C of the phase shifter 66 of each deep wound circuit 60, and a ROM 73 for gain control is connected to the control terminal C of each voltage gain regulator 68. . Then, the rector switch 74 is connected to the read / write input terminals of the ROMs 72 and 73 of each deep wound circuit 60. The ROM 72 for each phase control has a deep wound circuit 6 provided in it.
Based on the circuit characteristics of 0 and the sensitivity characteristics of the connected detection coil 23, it is most suitable for the type and wire diameter of the overhead wire 4.
The phase setting data that optimizes the S / N ratio is recorded.
That is, in the case of the ROM 72 of the deep wound circuit 60 to which the detection coil 23 that outputs the detection signal S ₁ is connected, for example, the phase setting data of 324 degrees in the steel core aluminum twisted wire (160 mm ² ) is
Further, the phase setting data of 215 degrees is stored in each of the optical fiber composite overhead ground wire (60 mm ² ). Further, the detection coil 23 that outputs the detection signal S ₂ is connected. In the case of the ROM 72 of the deep scratch circuit 60, phase setting data of 327 degrees and 215 degrees are stored in the same steel-core aluminum stranded wire and optical fiber composite ground wire. Hereinafter, the phase setting data is similarly recorded in the ROM 72 of the deep wound circuit 60 to which the other detection coil 23 is connected.

On the other hand, the ROM 73 for controlling each gain has the highest S / N ratio for the type and wire diameter of the overhead wire 4 based on the circuit characteristics of the deep wound circuit 60 and the sensitivity characteristics of the connected detection coil 23. Optimal gain setting data is stored. That is, in the case of the ROM 73 of the deep wound circuit 60 to which the detection coil 23 that outputs the detection signal S ₁ is connected, 29 dB in the steel core aluminum twisted wire (160 mm ² ) and the optical fiber composite overhead ground wire (60 mm ² ). And each gain setting data of 30 dB is stored. Further, in the case of the ROM 73 of the deep wound circuit 60 to which the detection coil 23 that outputs the detection signal S ₂ is connected, the gain setting data of 30 dB and 31 dB is stored, and the other detection coils 23 are connected below. Similarly, the gain setting data is also stored in the ROM 73 of the deep wound circuit 60.

In each deep wound circuit 60 having the above configuration, the detection coil
The detection signal S ₁ output from 23 is input to the connected deep wound circuit 60, amplified by the amplifiers 61 and 63, and at the same time, the bandpass filter 62 removes unnecessary frequency components. Next, this detection signal S ₁ is detected by the phase detectors 64A and 64B.
It is detected at a phase angle of 90 degrees and becomes pulsed detection signals P ₁ and P ₁ . The carrier filter 64 removes unnecessary frequency components from these detection signals P ₁ and inputs them to the phase shifter 66. On the other hand, the overhead wire 4 that should be deeply damaged is a steel core aluminum stranded wire (160 mm ² )
In the case of, since the operator switches the selector switch 74 in advance in correspondence with the steel core aluminum stranded wire by switching,
Decoders of the ROMs 72 and 73 decode the selection signal of the selector switch 74. Therefore, the ROM 72 causes the phase shifter 66 to rotate 324
The phase setting data indicating the degree is supplied, and the ROM 73 supplies the gain setting data indicating 29 dB to the voltage gain adjuster 68. Therefore, the S / N ratio is optimized by the phase shifter 66 without performing the detection signal P ₁ fine adjustment work, that is, by simply switching the selector switch 74 according to the type and wire diameter of the overhead wire 4.
The phase is automatically rotated by an angle of degree, and the gain is automatically adjusted by the voltage gain fine adjuster 68 at 29 dB which also optimizes the S / N ratio. Then, unnecessary frequency components of these detection signals P ₁ ′ are removed by the notch filter 69 and the bandpass filter 70, and full-wave rectified by the full-wave rectifier 71.

Below, the detection signals S _{2 to} S _{6 of} the other detection coils 23 are also applied to each deep wound circuit.
After being phase-detected at 60, the phase is similarly rotated by a predetermined angle, the gain is adjusted to a predetermined gain, and full-wave rectification is performed, and the detection signals P ₂ , P ₃ ... P ₆ are output.

Each detection signal P _{1 to} P output by each deep wound circuit 60
_As shown in FIG. 4, ₆ is input to the maximum value selector circuit 42 of the signal processing circuit 40. The maximum value selector circuit 42 selects and outputs the detection signal with the highest level among the detection signals P _{1 to} P ₆ . The rejection circuit 43 cuts signal components below the set level of the selected detection signal, and removes unnecessary signal components and noise corresponding to small scratches. The selection detection signal Sa output from the rejection circuit 43 is a modulation circuit.
At 44, for example, AM is modulated at 1 KHz, and R is recorded in the recording unit.
It is recorded on the magnetic tape through the channel. FIG. 5A is a stored waveform reproduction diagram of the selection detection signal Sa. As is clear from FIG. 5 (a), the rotation angles and gains of the detection signals P _{1 to} P ₆ are automatically determined by the ROMs 72 and 73 in accordance with the type and diameter of the overhead wire 4 to be deeply damaged. Since the selection detection signal Sa 'having a small level can be recorded on the magnetic tape since it is set to.

By the way, the camera operating circuit 41, as shown in FIG.
It has a comparator 45 and a one-shot multivibrator 46. The comparator 45 is set with a voltage corresponding to a scratch or the like that does not require photographing, and as shown in (a) of FIG. 5, when a selection detection signal Sa ′ corresponding to a scratch or the like that does not require photographing is input. When the selection detection signal Sa having a level higher than that of the selection detection signal Sa 'is input without outputting the defect signal Sb, the defect signal Sb is output. The one-shot multivibrator 46 outputs a shutter pulse (driving signal) P to the distance counter 47 when the defect signal Sb is input. The distance counter 47 constitutes a delay circuit. When the shutter pulse P is input, the distance counter 47 starts counting the pulse P ₀ from the encoder 13 and detects the travel distance of the deep wound device of the present invention. Then, the distance counter 47 outputs the operation signal Sc to the drive circuit 48 when the camera 35 moves to the detection position of the scratch or the like of the overhead wire 4 by traveling. The drive circuit 48 thereby supplies a drive current to the solenoid 37, so that the movable piece 37a retracts and presses the shutter 35a of the camera 35, as described above. Therefore, it is possible to reliably take a picture of the peripheral surface of the overhead wire 4 on which the scratches and the like are present by the single camera 35 via the reflecting member 39.

The pulse P _{0 of the} encoder 13 is also input to the counter 49. The counter 49 alternately outputs the distance signals Sd of "H" and "L" when the traveling distance becomes 10 m, for example, from the pulse P ₀ . This distance signal Sd and the above-mentioned shutter pulse P are input to the adder 50 and added, and the modulation circuit 51
After being AM-modulated at 1 KHz or the like, it is recorded on a magnetic tape or the like via the L channel. The recording / reproducing waveform is shown in FIG. 5 (b). That is, the distance signal Sd
“H” and “L” are repeated based on the above, and the shutter pulse P is superimposed at the detection position of a flaw or the like. Therefore,
The presence position of a flaw or the like on the overhead wire 4 can be known from the shutter pulse P.

In the above embodiment, the selector switch 74 may be switched by remote control.

Although the self-propelled deep-scratch device including the geared motor 14 has been described in the above embodiment, the present invention can be applied to a deep-scratch device indexed by a self-propelled construction machine.

(Effects of the Invention) According to the present invention, a deep wound circuit is connected to each of a plurality of detection coils, and phase setting data and gain setting according to the type and diameter of an overhead wire based on each detection coil and circuit characteristic. The data is stored in the phase control recording section and the gain control recording section, respectively, and the phase setting data and the gain setting data corresponding to the aerial wires of both storage sections are stored in the phase of each deep wound circuit by the selection signal of the switching means. The output of the detector and the gain adjuster allows the detection signal to be automatically phase-rotated at a predetermined angle and adjusted to a predetermined gain according to the overhead wire to be deeply damaged without performing fine adjustment work. Therefore, the sensitivity does not vary between channels, and
A corrected detection signal with an excellent S / N ratio can be obtained. Therefore, by selecting the signal with the highest level from the plurality of correction detection signals from each deep wound circuit and recording this selection detection signal on the recording medium, the state of damage to the overhead wire during subsequent recording data reproduction Can be accurately confirmed and grasped on the ground side. In addition, the overhead wire is photographed by the camera through the reflection member by the input of the selection detection signal described above, the traveling distance of the device is measured, and the traveling distance is recorded on the recording medium as traveling position data. Since the shutter drive signal obtained by the selection detection signal is recorded on the recording medium to indicate the damaged position on the traveling position data, the damaged position on the overhead wire can be reliably photographed and recorded. It is possible to check the damaged position of the overhead wire with high accuracy from the recorded waveform of the medium. Therefore, accurate maintenance and inspection data can be obtained.

[Brief description of drawings]

FIGS. 1 and 2 are diagrams showing a connection form of a deep wound circuit according to the present invention and a circuit configuration diagram, and FIGS. 3 (A) and 3 (B) are configuration diagrams of an excitation circuit and a detection coil, FIG. 4 is a diagram showing a connection form of a signal processing circuit and a camera operating circuit, FIG. 5 is a recording waveform diagram according to the present invention, FIG. 6 is a front view of a deep wound device according to the present invention, and FIG. 7 (A). , (B) are a front view and a side view of the coil holder, FIG. 8 is a view showing arrangement positions of a camera and a reflecting member, and FIG. 9 is a schematic view of a conventional deep wound device. 4 ... overhead wire, 10 ... running roller, 16 ... coil holder, 23 ... detection coil, 40 ... signal processing circuit, 41 ... camera operating circuit, 60 ... deep wound circuit, 64A, 64B ... … Phase detector, 66 …… Phase shifter, 68 …… Voltage gain adjuster, 72 …… Phase control ROM, 73 …… Gain control ROM, 74 …… Selector switch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuaki Namba 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa, Showa Electric Wire & Cable Co., Ltd. 1-1-1, Showa Cable Denki Co., Ltd. (72) Inventor Mizuo Kiuchi 2-1-1, Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa (56) Reference: JP-A-56-135151 ( JP, A) JP 55-128150 (JP, A) JP 59-231448 (JP, A) JP 53-87286 (JP, A) Actual development JP 62-25849 (JP, U)

Claims (1)

[Claims] 1. A traveling roller engaged on an overhead wire, a plurality of detection coils arranged along a peripheral surface of the overhead wire, for detecting damage to the overhead wire, and outputting a detection signal, A phase detector for detecting the phase of the detection signal, a phase shifter for rotating the phase of the detected detection signal, and a deep wound circuit including a gain adjuster for setting the gain of the detection signal with the rotated phase,
In a deep wire damage device for an overhead wire that travels on the overhead wire, a plurality of deep wound circuits respectively connected to the plurality of detection coils and a phase shifter of each deep wound circuit, and corresponding detection Connected to a phase control storage unit that stores phase setting data according to the type and diameter of the overhead wire based on the coil and circuit characteristics, and a corresponding gain detection device for each of the deep wound circuits. A gain control storage unit that stores gain setting data according to the type and diameter of the overhead wire based on the coil and circuit characteristics, and predetermined phase setting data and gain setting data in the phase shifter and gain adjuster. Switching means for supplying a selection signal corresponding to the overhead wire to both the storage sections so as to output, and a detection signal with the highest level among a plurality of detection signals corrected and output by controlling the phase and gain from each deep wound circuit. A signal processing circuit to be selected, a selection detection signal recording means for recording a selection detection signal from the signal processing circuit on a recording medium, a camera located rearward in the traveling direction for taking a picture of the overhead wire, and the camera. On the other hand, a reflection member that reflects the image of the peripheral surface portion of the aerial wire that does not face each other,
A travel distance measuring unit that measures the travel distance of the device based on the rotation of the travel roller, and a device that outputs a shutter drive signal by inputting the selection detection signal and that is based on the measurement signal from the travel distance measuring device. In the recording medium, a camera actuating means for actuating the camera at a time point when the vehicle travels a distance between the detection coil and the camera, a traveling position recording means for recording the traveling distance to be measured as traveling position data in a recording medium, and the recording medium. And a damage position recording means for recording the shutter drive signal indicating a damage position on the traveling position data.