JPH02214403A - Device for detecting degradation of overhead line - Google Patents

Abstract

PURPOSE:To detect degradation without arranging an electrical induction circuit at a sensor section by providing a vibration applying device, a sound sensor, a reference signal comparator, and a device for producing an abnormal signal. CONSTITUTION:The degradation searching device 10 is constructed such that the driving force of traveling pulleys 11, 11' and a motor 16 is transmitted through a rotary shaft 17, a gear 19, a rotary shaft 17', and a gear 20 thus self running the device 10 back and forth, as shown by an arrow, on n wire 1. Then the wire 1 is hit by means of a hammer 12 to produce vibrating sound which is caught by a sound sensor 22 arranged closely to an auxiliary pulley 11'', and a signal is provided from the sound sensor 22 to a detection unit 24. Upon detection of abnormal signal, the detection unit 24 transmits the abnormal signal through a transmitter/receiver 25 and an antenna 25a to a remote operating unit. Since hitting system is employed, the device is not subjected to induction and degradation of inner layer can be detected reliably.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an overhead line deterioration detection device that is configured to efficiently detect the presence or absence of deterioration of an overhead line and to notify any abnormality. It is related to.

[Prior Art] Overhead wires that are exposed to wind and rain as bare wires corrode and deteriorate over time, eventually requiring replacement.

However, the degree of progress of this deterioration varies greatly depending on the installation environment of the overhead line, and cannot be treated in a negative manner.For this reason, the degree of deterioration must be monitored and judged individually for each road or span. The reality is that

Among the deterioration detection methods that have been used in the past, the most precise method is external inspection by patrolling by lifeguards, but this method is designed to grasp the details of deterioration in overhead wires installed at high places. It is difficult to determine the extent of the deterioration occurring in the inner layer of overhead wires.

Therefore, a deterioration detection device, the basic principle of which is shown in FIG. 5, has been proposed and put into practical use.

This device includes a coil 2a around a wire 1 to be measured.

2b as shown in the figure, AC power supply 3 and switch 4
This allows alternating current to flow through the coils 2a and 2b.

5 is a reference resistance. If the material, shape, dimensions, etc. of the electric wire 1 inside the coils 2a and 2b are the same, the impedance resistance of the coils 2a and 2b will be the same, and the needle of the meter 6 will point to zero without swinging. Continue.

However, if there are different conditions in either the coil 2a or 2b, for example, if the @ wire on one coil side is scratched, broken, or corroded, the balance of the meter 6 will be broken.
The needle on meter 6 will swing. With this, wire 1
This is to detect the presence of an abnormal point, that is, deterioration.

[Invention or problem to be solved] In principle, deterioration of electric wires can be detected by the above method, but in order to detect minute kisses, etc., the device itself needs to be extremely sensitive. There is. However, when the sensitivity is increased in this way, the following abnormal operation occurs, making practical measurement difficult.

(1) The influence of induction from the adjacent live wire 1' increases, causing malfunctions and noise, rendering it useless as a sensor.

(2) Unlike new electric wires, the response characteristics to inductance are no longer uniform in the longitudinal direction, and as a result of this being exaggerated, an alarm is issued as an abnormality even though it is not abnormal, and there is a difference between abnormality and normality. become indistinguishable.

(3) There is more or less induced voltage in power transmission lines, but if the sensor section is an electric coil, it is impossible to eliminate the intrusion of such induced voltage on site.

An object of the present invention is to provide a novel overhead line deterioration detection device that eliminates the problems associated with the prior art as described above, does not use an electric induction circuit in the sensor part, and can accurately detect the presence or absence of deterioration. This is what we are trying to provide.

[Means for Solving the Problems] The present invention provides a system in which a device itself is formed into an ellipse so as to be self-propelled on an electric wire, and the device includes a vibration imparting device that applies vibration to the electric wire, and a device that generates vibrations caused by the vibration applied by the device. A device equipped with a sound sensor that captures the vibration sound of the electric wire, a comparator that compares the signal of the sound sensor with a separately provided reference signal, and an output device that outputs an abnormal signal detected as a result of the comparison. It is.

[Function] When the wire deteriorates, the vibration noise generated when it is vibrated changes. Therefore, the presence or absence of an abnormality can be easily detected by comparing the normal state vibration sound with this reference sound.

Moreover, in the present invention, no electrical induction circuit is used in the sensor section, and there is no possibility of disturbance due to induced voltage penetrating the electric wire.

[Example] The present invention will be described below with reference to Examples. FIG.
It is an explanatory view showing a state where o is attached.

11, il- is a traveling pulley, and the driving force of the motor 16 is connected to the rotating shaft 17. Gear 19, same rotating shaft 17-, gear 2
0, and once the entire device is configured to move forward and backward on the electric wire 1 as indicated by the white arrow in the figure, it can move on its own.

Reference numeral 12 denotes a hammer having a moving stroke from 12' to 12'' shown by a dotted line, which is movable as shown by the arrow and hits the electric wire 1 to generate a vibration sound.

That is, the driving force of the motor 16 causes the rotating shaft 1 to rotate.
When the cam 18 connected to the rod 1 is rotated, the rod 1
The hammer 12 is pushed up by the cam 18 and swung up against the spring 13 to the position 12' in the figure. When the hammer 12 is swung up to the maximum position, the cam 18 is released all at once, and the hammer 12, which has sufficiently accumulated the biasing force of the spring 13, is displaced all at once to 12'' and strikes the electric wire l.

As described above, when the hammer 12 hits the electric wire 1,
A vibration sound is generated. A sound sensor 22 installed near the auxiliary pulley 11'' captures the vibration sound, and inputs the signal to the detection unit 24.

FIG. 2 is a block diagram showing a specific configuration of the detection unit 24. The sound signal captured by the sound sensor 22 is amplified by the amplifier 27 and input to the comparator 28. A reference signal from a separate reference signal generator 29 is input to the comparator 28.
As this reference signal, the vibration sound of the electric wire 1 under test in a normal state is transmitted manually.

According to a rule of thumb, the simplest and surest way to determine the deterioration of a metal material is to strike it and hear the sound. This means is carried out in every field on a daily basis, but the present invention focuses on this point, and by distinguishing the vibration sound of the electric wire 1 generated by the hammer in the above-mentioned Uni-Yh 24, It is possible to immediately determine whether there is deterioration not only on the surface but also on the inner layer.

Moreover, the present invention does not rely on human ears, which have large individual differences, to distinguish vibration sounds, but instead prepares in advance vibration sounds in a normal state determined by the size of the electric N1 and the tension of the overhead wire, and uses this as a standard. Input it into the comparator 28 as No. 13,
Since it has a configuration that compares the vibration sound captured by the sound sensor 22, its detection sensitivity is extremely high.

When the comparator 28 detects an abnormal signal, the relay device 30 may display the abnormality on the display 31, the alarm 32 may issue an alarm, or the transmitter/receiver 25 and antenna 25a shown in FIG.
The abnormal signal may be transmitted to the remote control device 40 having the transmitting/receiving antenna 41 on the ground via the above-mentioned antenna.The above signal may also be recorded.

FIG. 4 shows a deterioration detection device upper plate according to the present invention running on the electric wire 1 which is connected between the steel tower Tl and 'I゛2,
It is an explanatory diagram showing how this is operated by the above-mentioned remote controller 110 on the ground. If signals are transmitted and received between the antenna 41 on the ground and the antenna 25a on the wire, operation commands can be issued to the upper tray of the deterioration detection device using the remote controller 40, and one deterioration detection device can communicate with each other. It is also possible to receive the detection signal directly on the ground and make a determination on the ground.

In FIG. 1, 14 is a shock absorber that softens the impact of the hammer 12, and 21 is a measuring device that measures the distance traveled by the device on the electric wire l.The purpose of their installation will be described later. 23 is a proximity switch that detects when the device approaches a steel tower accessory and stops the self-propelled operation to prevent the device from colliding. Reference numeral 24 represents an intelligent unit containing the previously described detection unit and an operation control unit for the motor 16, and 26 represents a battery serving as a power source.

The electric wire 1 is made of a stranded wire made by twisting together a large number of metal wires, and the stranded wires are stretched over a span of about 300 to 500 mQ degrees with a large overhead wire tension, and are in a state similar to the strings of a musical instrument. Therefore, if the wire is vibrated with the hammer 12, a normal wire will generate a vibration sound with a clean primary waveform as shown in FIG. 3(a). If the wire 1 has deteriorated over time and its cross-sectional area has become smaller, or if the inner layer has corroded and become rough, it will not have the primary waveform as shown in Figure 3 (a), but will have a ) appears as a waveform of multiple orders. Therefore, by comparing the two in the comparator 28, the presence or absence of a deterioration abnormality can be determined very easily.

In this case, if the distance from the steel tower is measured using the measuring device 21, it will not only be possible to determine whether the top plate of the deterioration detection device is traveling, but also to accurately record the position of the abnormal point on the wire 1. It is very convenient for repairs, etc.

All of the above are examples, and it goes without saying that the design can be changed as necessary. Alternatively, the motor 16 or a small engine may be used as the drive source. The speed may be configured to be variable by a transmission.

In addition, for running movement on the electric wire, a caterpillar may be used instead of the pulleys 11 and 11, which is effective in preventing runaway falls on steep slopes.

It is preferable that the size and weight of the hammer 12 are not fixed but can be changed depending on the size of the wire to be measured.Furthermore, the wire surface may be coated with urethane or the like to protect it. As a means for applying impact force to the electric wire, not only spring force but also hydraulic pressure or the like may be used.

In addition to collecting vibration sounds, the device may also be equipped with a separate video camera, still camera, etc., so that visual inspection can be performed at the same time.

Unlike the conventional example shown in FIG. 5, the device according to the present invention does not have any electromagnetic detection means and relies on mechanical detection using vibration sound. There is no influence at all, and it becomes possible to perform stable and highly reliable deterioration detection.

[Effect of the invention 1 As detailed above, according to the present invention, there is nothing in the sensor section that is affected by induction, no disturbance occurs even when the sensitivity is increased, and since it is a percussion method, deterioration of the inner layer is ensured. Recording the waveform greatly contributes to improving detection accuracy through re-analysis or judgment learning effects, and when used in conjunction with a measuring scale, the location of deterioration can be accurately determined. Many advantages can be expected in terms of deterioration diagnosis.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment according to the present invention, Fig. 2 is a block diagram showing the configuration of a detection unit, Fig. 3 is an explanatory diagram showing a waveform of vibration sound, and Fig. 4 is an explanatory diagram showing a device according to the present invention. FIG. 5 is an explanatory diagram showing the usage status of the conventional deterioration detection device. 1: 10: 11, ll', 11" = l 2: 13: 15: 16: 17, 17-: 18: 21: 22: 24: 25: Electric wire, deterioration detection device, pulley, hammer, spring, rod, Motor, rotating shaft, cam, measuring instrument, sound sensor, unit, transmitter/receiver, 25a: antenna, 40: remote controller.

Claims (1)

[Claims] (1) A vibration imparting device that is configured to be able to run on electric wires and vibrates the electric wires, a sound sensor that captures the vibration sound of the electric wires generated by the vibrations applied by the device, and a signal from the sound sensor. A deterioration detection device for an overhead line, comprising a comparator that compares it with a separately provided reference signal, and a signal output device that outputs an abnormal signal detected as a result of the comparison.