JP2005033926A - Method of diagnosing corrosion of electric wire, and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new technique which enables the precise and detailed measurement and the detection of the quantitative amount of corrosion, by enabling an inspector to judge the corrosion of a stretched laid cable, without occurrence of individual differences in his judgment and without occurrence of influence of external parameters, in a method of determining the corrosion of the cable in a conductive wire way. <P>SOLUTION: This is a method of diagnosing the corrosion by acquiring the data of electric resistance at its target point, in the conductive wire way which supplies electricity by the laid cable. The laid cable is a stranded conductor consisting of a plurality of layers and element wires, and the target point is the specified point of the laid cable or the specified point including the laid cables and a member for coupling them. The data on the relation between electric resistance and corrosion is acquired, using a reference object which has the same constitution as the target point and can simulate the same state as the target point. The data are made the reference data at the target point, and in the laid cable at the target point, electric contact is removed from the cable so as to measure the electric resistance thereby acquiring actually measured electric resistance data. The variation of the corrosion of the laid cable is obtained by comparing the acquired actually measured electric resistance data with the reference data, thus the degree of the corrosion at the target point is diagnosed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric wire corrosion diagnosis method and apparatus for diagnosing the degree of corrosion at a predetermined location of an installed electric wire installed to supply electric power or a conductive line including the installed electric wire.
[0002]
[Prior art]
Electric wires used as electric conductor lines for power transmission, distribution, substation, etc. for power supply are usually stretched between structures such as steel towers and utility poles. Among electric wires, electric wires called bare wires are not covered and are composed of a plurality of twisted strands, and many are laid as transmission and transformation electric wire paths in the electric power supply field. Since these laid bare wires remain exposed to the field for a long time, they are greatly affected by various external environmental factors and may cause aging corrosion. One factor of the corrosion is the corrosion of the electric wire. If this electric wire corrosion progresses, it causes electrical connection failure, abnormal temperature rise (heat generation), power loss, etc. There is a risk of developing into a serious accident such as a power failure due to fusing. Therefore, in order to prevent such accidents and the like, it is necessary to constantly monitor the electric wires and their connection points to check for harmful corrosion.
[0003]
Corrosion, heat generation, poor connection, and the like occur along with deterioration of the conductive line, but there have been the following known methods for monitoring and checking the corrosion of the conductive line.
(1) Visual observation
In general, a method of observing and judging a surface of a stretched electric wire directly by visual observation is generally performed. However, the electric wire stretched between the tower diameters has a considerable distance from the ground, and it cannot be judged by an inspector who observes it closely. For this reason, a manned air hoist can be run on an overhead wire, and the inspector on the helicopter can visually observe the track. An unmanned self-propelled aircraft equipped with a video camera can be A method of observing and determining by obtaining visual image information by running the vehicle is performed.
(2) Observation by temperature measurement using an infrared camera
If the corrosion of the wire and the wire connection progresses, the current flow will deteriorate, so the temperature at the corrosion location will rise considerably. A method for obtaining a temperature distribution and analyzing / determining the corrosion of the wire has been implemented.
[0004]
[Problems to be solved by the invention]
The above-described conventional method for monitoring and checking corrosion of conductive lines has the following problems.
(1) Problems with visual observation
Since observation is based on visual observation, it is impossible to make a quantitative determination, and it is also impossible to detect corrosion inside the electric wire. For example, the cross section of the electric wire shown in FIG. 3 is an ACSR electric wire (steel core aluminum stranded wire) which is one of bare wires, and a steel core wire (St) composed of a plurality of stranded wires of steel strands at the center and the outside thereof Has a layer of aluminum wire (Al) consisting of many strands of aluminum strands. Corrosion in this electric wire usually occurs due to electric corrosion in the aluminum wire inner layer (Al) in contact with the steel core (St), and corrosion cannot be determined only by observation from the appearance. Since corrosion occurs not only from the outside but also from the inside, most of the general progress of corrosion cannot be judged by visual observation. It is difficult to judge.
[0005]
(2) Problems of observation with an infrared camera
In temperature measurement using an infrared camera, there are many parameters that affect the measurement. Assuming that the measurement point is a stretched electric wire at a considerable distance, the parameters include weather / sunlight / size / distance / color / material / surface condition / tidal current flowing through the electric wire. If there are so many parameters, precise temperature measurement is impossible, and it is better to think that absolute temperature cannot be measured. Thus, accurate detection with an infrared camera is difficult unless a portion of the wire is subject to extreme corrosion or temperature rise.
[0006]
The electric wire corrosion diagnosis method and apparatus of the present invention have been made in view of the problems of the prior art as described above, and the inspection operator judges the corrosion of a built-in electric wire such as a bare wire stretched over an aerial. It can be judged without causing individual differences and without the influence of external parameters, etc., and the amount of corrosion of the wire can be detected with high precision and the electrical connection between the wire and the member connecting it. An object of the present invention is to provide a novel technique for diagnosing wire corrosion that enables detection of the degree of failure.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the wire corrosion diagnosis method and apparatus according to the present invention comprises the following means.
(1) An electric wire corrosion diagnosis method for diagnosing corrosion by obtaining electrical resistance data at a target location in a conductive line that has a built-in electric wire and supplies electricity,
The installation electric wire is a stranded conductor composed of a plurality of layers and strands,
The target location is a predetermined location of the installed electric wire, or a predetermined location of the location including the installed electric wire and a member connecting it,
Relationship between electrical resistance and corrosion at the target location using a reference target made of a conductive target that has the same (same or equivalent) configuration as the target location and can simulate a state equivalent to the target location. Get baseline data about
In the installation electric wire in the target location, to obtain the measured electrical resistance data measured by taking electrical contact from the electric wire,
By comparing the acquired measured electric resistance data with the reference data, the corrosion change of the installed electric wire is obtained, and the degree of corrosion (degree) at the target location is diagnosed.
[0008]
(2) In the wire corrosion diagnostic method of (1),
It is assumed that the overhead electric wire is in a live line state or a stopped state (one line is in a live line state).
When acquiring the measured electrical resistance data measured by taking electrical contact from the target location of the installed wire, the measured current is an alternating current that flows through the target location (measurement object), so the target location is in a stopped state (one line) Is a live wire, and the resistance can be measured even when an induced current flows by grounding.
(3) In the wire corrosion diagnostic method of (1) or (2),
The corrosion includes corrosion factor factors such as the degree of reduction in the effective cross-sectional area of the installed electric wire, or the degree of electrical connection failure between the installed electric wire and a member connecting it.
(4) In the wire corrosion diagnostic method of (1) to (3),
The acquisition of measured electrical resistance data at the target location and the acquisition of reference data using a reference object are resistance measurement methods that pass (permeate) harmful substances on the surface of the wire and take electrical contact from inside the wire. The data is acquired by
This type of contact terminal has a sharp tip and is pressed against the surface of the wire (elementary wire) to break through the oxide film and dirt on the surface of the wire to obtain electrical continuity. There is.
[0009]
(5) An electric wire corrosion diagnostic apparatus for diagnosing corrosion by obtaining electrical resistance data at a target location in a conductive line that has a built-in electric wire and supplies electricity,
The installation electric wire is a stranded conductor composed of a plurality of layers and strands,
The target location is a predetermined location of the installed electric wire, or a predetermined location of the location including the installed electric wire and a member connecting it,
Using a reference object made of a conductive object that has the same (same or equivalent) configuration as the target part and can simulate a state equivalent to the target part, and the degree of electrical resistance and corrosion at the target part Means for obtaining reference data on the relationship between
In the installation electric wire in the target location, means for obtaining measured electrical resistance data measured by taking electrical contact from the outside of the electric wire;
Means for obtaining a change in corrosion of the installed electric wire by comparing the obtained measured electric resistance data and the reference data, and diagnosing the degree (degree) of corrosion at the target location. A diagnostic device was used.
(6) In the wire corrosion diagnostic apparatus of (5),
The wire corrosion diagnostic apparatus includes a self-propelled device capable of traveling and moving on the installation electric wire by itself.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a wire corrosion diagnosis method and apparatus according to the present invention will be described with reference to FIGS.
First, FIG. 1 is a schematic view of a power transmission line that is an example of a conductive line that performs wire corrosion diagnosis according to the present invention. Here, the structural support body for laying and securing a plurality of electric wires is a steel tower (10, 20), and is fixed to the ground. As the electric wires to be installed, there are an upper phase electric wire 31, a middle phase electric wire 32, and a lower phase electric wire 33 for flowing electricity, and in addition, there is an overhead ground wire 34 which is a lightning-resistant ground wire. These electric wires (31, 32, 33) can be directly used as jumper wires (40, 40 ′, 40 ″) via the clamping clamps (16, 16 ′, 16 ″) or via jumper sockets. By connecting to a new separate jumper line (40, 40 ', 40''), a transmission line network connected and linked between a large number of steel tower diameters is formed. The overhead ground wire 34 spanned between the spans is held and fixed at the overhead ground wire holding portion (11, 21) near the top of the steel tower (10, 20) and connected to the steel tower (10, 20). Has been.
The retaining clamps (16, 16 ′, 16 ″) for retaining the electric wires (31, 32, 33) to the steel tower 10 are connected to the steel tower via the insulator devices (15, 15 ′, 15 ″). To the arm-like support (12, 12 ', 12'') extending laterally from the side.
[0011]
The present invention is a wire corrosion diagnosis method for diagnosing corrosion by obtaining electrical resistance data at a “target location” in a conductive line having an “installed wire” and supplying electricity, and the installed wire in FIG. 31, 32, 33, 34), and the target location is (I, II) as an example.
FIG. 3 is an example of an erected electric wire (31, 32, 33), which is an example of a line type of an ACSR electric wire (power line) called a bare wire, and shows a cross section thereof. The ACSR electric wire is a stranded conductor composed of a plurality of strands regularly twisted. As shown in FIG. 3, there is a steel layer (St) of a steel core wire composed of a plurality of stranded wires of steel strands in the center, and the outer periphery thereof is an aluminum layer composed of many strands of aluminum strands ( Al) surrounds the circumference.
[0012]
Among the target locations (I, II) related to the present invention described above, the target location I is a predetermined location on the electric wire 32 laid over the span. Moreover, the target location II is a predetermined location where the sleeve 60 is attached on the electric wire 31 that is also spanned between the diameters. The connection sleeve 60 of the target portion II is used for the wire compression used when the wires are directly compressed and connected to each other in series, or when the wires are repaired and repaired for reinforcement due to damage to the surface of the wires. It is a connecting pipe.
Among these target locations (I, II), the target location I corresponds to a predetermined location (32 ') in the span of the installed electric wire 32, or the target location II is a member that connects the installed electric wire 31 and this. It hits a predetermined location (31 ′) including a certain sleeve 60.
[0013]
In the present invention, using a reference object (conductive object) that has the same (same or equivalent) configuration as the target part and can simulate a state equivalent to the target part, the electrical resistance at the target part Reference data on the relationship between corrosion and corrosion is acquired, and an example of acquiring reference data from those reference objects will be specifically described with reference to FIGS.
2 (1) and 2 (2) are conceptual diagrams showing how reference data is acquired from an example of a reference object. The reference object is the electric wire 70 itself (A) in FIG. 2 (1), and includes the overhead electric wires (80, 80 ′) and the sleeve 81 that compresses and connects them in FIG. 2 (2). It is an electric wire connection structure (B).
[0014]
First, FIG. 2 (1) shows the electric wire 70 itself, and this electric wire 70 has the same configuration as the electric wire 32 ′ at the target location I and is a reference for simulating the same status as the target location. It is prepared as an object (A). The configuration of the electric wire 70 is the same as that of the electric wire 32 ′, but it is preferable to use the same electric wire, that is, an electric wire having the same material and the same stranded wire (elementary wire) structure.
[0015]
And as a state of the electric wire 70 used as this reference | standard object (A), it is necessary to be able to simulate the state equivalent to electric wire 32 'in the target location I. FIG. Since the electric wire 32 ′ at the target location I is corroded by being exposed to the natural environment over time, the electric wire 70 used as the reference object is also an electric wire that can simulate the state of corrosion equivalent to the electric wire 32 ′. Here, the electric wire 70 simulating a state equivalent to the target location I can be prepared by creating an experimental corrosion state using an exposure facility simulating a natural environment that has a large influence on corrosion. it can. Moreover, it can use as an electric wire which can simulate the state equivalent to it also by utilizing the removed old electric wire which can be considered as the state equivalent to the state of electric wire 32 'of the target location I. FIG.
[0016]
In FIG. 2 (1), it connects with the resistance measuring machine 70A which has a current sensor (not shown) by the lead wire from the contact terminal part (a1 and a2) on the electric wire 70 used as a reference | standard object, and the electric wire 70 The electrical resistance is measured to obtain data, which is used as basic data. When measuring the resistance, it is preferable to use the contact terminal portion having the same structure as the contact terminal used in the measurement of the electric wire 32 ′ at the target location I, and between the contact points (a1-a2). The distance is preferably the same as the distance between the contact terminals measured by the electric wire 32 ′ of the target location I. By doing so, precise data corresponding to the target location I can be obtained.
[0017]
In this invention, the reference | standard data regarding the relationship between the electrical resistance in the object location I and corrosion is acquired using the reference | standard object called the electric wire 70. FIG. In the present invention, the degree of corrosion of the electric wire 70 as a reference object can be expressed as the degree of corrosion, and the electric resistance of the electric wire 70 and the degree of corrosion can be regularly related.
Then, the example of how to obtain | require the relationship between an electrical resistance and the degree of corrosion is shown next. In the case of FIG. 2 (1), a new electric wire 70 is prepared as an electric wire to be a reference object. Measure the electrical resistance at that time. Then, as the electric wire 70 is gradually corroded, each stage is provided every time it is corroded, and this is used as the degree of corrosion, and the electrical resistance is measured at each stage of corrosion (degree of corrosion). In this invention, since the electric wire 70 used as a reference | standard object can simulate the state equivalent to the target location I, it becomes equivalent to the target location I in the stage of the corrosion (degree of corrosion). Corrosion grades are also included.
[0018]
The degree (degree) of corrosion is considered as follows.
In order to obtain a corroded sample wire, the wire may be treated using a corrosion promotion test such as a salt spray test or a dipping test in a corrosive liquid for the purpose of promoting the corrosion of the wire. The amount of corrosion and rust generated in this accelerated corrosion test should be measured quantitatively using an electron microscope or precision measuring device, and the amount of corrosion or rust should be used as a measure of the degree (degree) of corrosion. it can.
Also, assuming that the variation in the electrical resistance of the wire depends on the variation in the effective cross-sectional area of the wire itself, the variation in the effective cross-sectional area of the wire can be used as a measure of the degree (degree) of corrosion as it is. it can. In practice, the degree of corrosion may be the degree of reduction in the effective cross-sectional area of the wire.
[0019]
Up to now, the method of obtaining the reference object according to the present invention and the method of determining the degree (degree) of corrosion have been described mainly in relation to the predetermined location consisting of only the electric wire. It can carry out similarly about the location containing the member which connects. Referring to FIG. 2 (2), the reference object here is an electric wire connection structure (B) including [electric wire 80-sleeve 81-electric wire 80 ′]. The reference data can be obtained in the same manner as in the case of only the case. As the degree (degree) of corrosion at this time, it is possible to use the degree of failure of the electrical connection configuration including the erected wire and the member connecting it, which is referred to herein as the degree of electrical connection failure. The degree (degree) of this electrical connection failure includes corrosion of the electric wire itself and factors such as deterioration of the electrical connection at the connection location inside the sleeve due to the corrosion. It may be considered that the degree (degree) of the poor connection is practically dependent on the increased value of the electrical resistance at this connection point.
[0020]
In the present invention, the electric wire connection structure B which is an example of the reference object includes not only an electric wire but also a member for connecting the electric wire connection structure B. The electric wire connection structure B has an equivalent (same or equivalent) configuration to the target location. It is comprised as what can simulate the equivalent state, By these electric wire connection structures B, the reference data about the relationship between the electrical resistance in the said target location and the grade (degree) of corrosion can be acquired. The reference object corresponding to the target location I in FIG. 1 is the electric wire (A) in FIG. 2 (1), and the reference target corresponding to the target location II in FIG. It is an electric wire connection structure (B) in (2).
[0021]
FIG. 4 is a diagram showing an example of using the reference object to obtain data on the relationship between the electrical resistance and the degree (degree) of corrosion. Using. These data become reference data at the target location. In the reference data shown in FIG. 4, the horizontal axis is the wire cross-section reduction rate (%) indicating the degree (degree) of corrosion, and the vertical axis is the increase rate (%) of the electrical resistance value.
The data in FIG. 4 has the same configuration as the target location (electric wire) to be diagnosed, and uses the reference object (sample electric wire) that can simulate the same state as the target location (electric wire). This is reference data obtained from data related to corrosion.
[0022]
As the sample wires used to obtain the reference data, a large number of removed old wires and wires that have been corroded in the laboratory are used to measure their electrical resistance and precisely measure the weight loss of these wires themselves. By doing this, the wire cross-section reduction rate is calculated. For these sample electric wires, the length of the aluminum wire (resistance measurement point) is measured and the weight loss is measured, and the weight loss measurement may be performed according to a predetermined procedure.
[0023]
FIG. 4 is a data diagram showing an example of a large number of sample electric wires actually measured as described above, and the degree (degree) of corrosion on the horizontal axis is the electric wire cross-sectional reduction rate%. The sample wire here has a reduction rate of about 5 to 30%, and the resistance increase rate is obtained. The plot (marked with ●) is an actual measurement value, and these are connected by a line in FIG. As can be seen in FIG. 4, there is obtained a correlation in which the electric resistance and the degree of corrosion (wire cross-sectional reduction rate%) change in a regular line.
[0024]
The reference object in FIG. 4 is an A structure consisting only of the electric wires illustrated in FIG. 2 (1), but the reference data also includes the electric wire connection structure B including the other members in FIG. 2 (2). You can get it. In the case of this electric wire connection structure B, an electric resistance increase value is obtained based on an electric resistance measurement value measured using an equivalent sample structure B. As the degree (degree) of deterioration of the electric connection part, A value correlated with the resistance increase value can be set to be used as it is. That is, here, the electrical resistance increase value in the sample structure B directly indicates the degree (degree) of deterioration of the electrical connection portion, and the reference data can be easily obtained by a practical and simple method.
[0025]
FIG. 5 shows the standard of the relationship between the electrical resistance (resistance increase rate%) and the degree of corrosion (average cross-sectional area decrease%) when the wire itself (predetermined location I in FIG. 1) is selected as the location for determining corrosion. It is an example which shows data, and is based on the data actually measured using the deterioration simulation electric wire and the removal electric wire. The sample wire used as the reference object has the same structure as the predetermined location to be judged, and is in the same condition as the wire at the prescribed location to be judged by causing internal corrosion by performing accelerated corrosion in the laboratory. Wire (degradation simulated wire), and a wire that has been previously installed in the same state as the wire at the specified location (removed wire), and the degree of corrosion here is the average breakage of the wire Area reduction rate (%). The measured data obtained by plotting in FIG. 5 is obtained in a relatively small range of the average cross-sectional area reduction rate (%), and is clearly shown in the average cross-sectional area reduction rate (%) and the resistance increase rate%. Correlation is seen. Since the plot of FIG. 5 is actually measured points, there is some variation. To use it as reference data, data obtained by averaging the measured points, that is, the data of the straight solid line in FIG. do it.
[0026]
FIG. 6 shows a self-propelled electric wire inspection device (1) according to the present invention, which is an example of an apparatus for measuring electrical resistance at a predetermined location. This self-propelled electric wire inspection device {circle around (1)} travels on the installed electric wire 100 and measures the electrical resistance at a desired predetermined location. This device 1 has the center of gravity of the device at a position below the electric wire, is placed on the electric wire 100 via the wheels (101, 102) and is stabilized, and the traveling drive unit 103 is attached to the wheels (101, 102). The device is interlocked and rotationally driven by applying a rotational driving force, and the device {circle around (1)} moves forward and backward on the electric wire 100.
This self-propelled electric wire inspection device {circle around (1)} includes, as its constituent elements, a DC motor 2, a guide portion 3, a contact probe {circle around (4)} (contact portion 4a), a temperature sensor 5, a current sensor 6, a sensor holder 7, and a guide. Shaft 8, guide spring 9, guide shaft holder 10, lock solenoid 11, upper limit SW 12, joint shaft 13, curl limiter 14, pinion 15, rack 16, frame A17, frame B18, cover A19, cover B20, arm A21, arm It has members such as B22, SOL-OFF-SW23, and motor cover 24. In addition, all the codes | symbols in the above-mentioned FIG.
[0027]
The device {circle around (1)} has two contact probes {circle around (4)} on the front and rear sides of the device in the direction of the electric wire 100 (the right and left sides of the device in FIG. 7). From here, the electric resistance of the electric wire is measured by directly making electrical contact with the electric wire 100. The two contact probes (4) are housed in the frames (17, 18) when not measuring, but are structured to move downward during the measurement, so that they contact the wire 100 reliably. Control is made. Further, in this device (1), the distance between the two contact probes (4) has a structure that is fixed by the arm A21 and the arm B22. Can be adjusted to a certain distance. Furthermore, the measurement item of the apparatus (1) is not limited to resistance measurement alone, and other items such as temperature and current can be measured.
[0028]
Here, the contact portion 4a on the lower end face of the contact probe (4) has a sharp tip as its structure and presses it against the surface of the electric wire (elementary wire), thereby forming an oxide film on the surface of the electric wire. It is advisable to adopt a structure that breaks through and dirt and obtains electrical continuity, and this type of contact terminal is referred to herein as a “pin point terminal”. FIG. 7 is a diagram in which a difference between a resistance measurement value by a pinpoint terminal without wire polishing according to the present invention and a resistance measurement value by a bind terminal with wire polishing according to a conventional type is examined. According to this, the difference is about +0.5 μΩ to −1.1 μΩ, and it can be seen that resistance measurement can be performed with high accuracy using a pinpoint terminal without polishing the wire as in the prior art. Therefore, in carrying out the present invention, if a self-propelled measuring device equipped with a pinpoint terminal is used, it is possible to perform sufficiently accurate measurement without polishing the wire as in the prior art. Furthermore, by increasing the contact pressure of the pinpoint terminal, more precise measurement can be performed.
[0029]
The self-propelled electric wire inspection device {circle around (1)} is for controlling the movement of at least the self-propelled machine control means (self-controlling means) as a self-propelled machine that runs on the electric wire 100 by remote control and the contact probe (4) And a terminal unit control unit (end control unit) and a measurement unit control unit (measurement unit) for controlling the contact portion 4a in actual resistance measurement on the surface of the electric wire 100, and execute these units. As a circuit for this, it has a self-propelled machine control circuit, a terminal part control circuit, and a measurement part control circuit. In addition, there is a remote control device for remotely operating the self-propelled electric wire inspection device {circle around (1)}, which has remote operation means (remote operation control circuit).
[0030]
FIGS. 8-10 is a figure explaining an example of the operation | movement sequence of self-propelled electric wire inspection apparatus (1) when measuring electrical resistance data with the self-propelled machine for the installed electric wire based on this invention. . FIG. 11 is also a diagram for explaining an example of “IO; open collector input / output”.
FIG. 8 is an example of an operation sequence showing measurement of “only the electric wire (in the case of the predetermined portion I in FIG. 1)”. The self-propelled machine control circuit in the figure is “self-control”, and the terminal unit control circuit is “ The “end control” and the measurement unit control circuit are described as “measurement”.
FIG. 9 is also an example of an operation sequence showing the measurement of “wire-sleeve-wire (in the case of the predetermined portion II in FIG. 1)”.
[0031]
FIG. 10 is an example of an operation sequence when an emergency stop is performed due to an unexpected situation. The unexpected situation is as follows.
・ When the self-propelled electric wire inspection device (1) is not mounted on the sleeve, the vehicle body is tilted, and measurement is performed in that state.
・ When the vehicle starts to slip during measurement.
・ When the travel switch is accidentally pressed during measurement or when the measurement switch is accidentally pressed during travel. In these cases, it is necessary to immediately press the stop or stop switch.
[0032]
○ When the stop switch is pressed when not measuring (running or stopping)
・ Shortcut: Since it is “stop signal for measurement, terminal lifted end state”, it gives a measurement end signal to self-control.
・ Measurement: Ignore it because it is not being measured.
• Self-control: Sends a measurement end signal.
• Remote control: No response when the lamp is off during measurement.
[0033]
In the wire corrosion diagnosis method and apparatus according to the present invention, by using the self-propelled resistance measuring device as described above, the data measured by measuring the electrical resistance at the target location to be measured with the installed electric wire. This is used as measured electrical resistance data. Moreover, the relationship data of an electrical resistance and corrosion are acquired with the reference | standard object equivalent to an object location, and this is made into reference | standard data. Therefore, the above-mentioned reference data and this actually measured electric resistance data are compared and judged, and the degree of corrosion is judged to perform the corrosion diagnosis.
[0034]
The acquisition of the reference data in the present invention may be either before or after acquisition of the measured electrical resistance data. In other words, if reference data is acquired in advance, comparison and judgment can be made immediately after the actual measured electrical resistance data is acquired, so by installing the reference data in the self-propelled resistance measuring device, Corrosion diagnosis is possible. In such a self-propelled resistance measuring device, at least means for storing reference data including the electric resistance and the degree of corrosion, means for storing measured electric resistance data, and the reference data and the measured electric resistance data It is necessary to have a corrosion comparison judgment means.
Even if the reference data is not acquired at the actual time at the site, the measured electrical resistance data is acquired, the data is taken home, and then the reference data is obtained to compare the data. It is possible to diagnose corrosion.
[0035]
【The invention's effect】
In this invention, there exists a special effect as described below.
According to the corrosion judgment technique based on the present invention, the resistance as a physical quantity is measured, so that the accurate and quantitative degree of corrosion can be detected, and the degree of corrosion can be accurately regarded as a change in the cross-sectional area of the electric wire. Can detect the amount of corrosion.
Conventionally, the electric power line is stopped and the operator is suspended in the electric wire and the resistance is measured. In contrast, in the present invention, since the measurement can be performed in the live line state, the power ( There will be no major impact on customers to stop electricity. And measurement workability | operativity improves and the starting force of a measuring apparatus is also raised.
[0036]
The diagnosis of corrosion in the wire corrosion diagnosis method and apparatus according to the present invention can be applied not only to a conductive line using only an electric wire but also to a conductive line in which an electric wire is connected via an electrical connection member such as a sleeve or a clamp. can do.
Since the target part II in FIG. 1 is a part including a sleeve connection, in a conductive line having a part where the wire is connected via a straight sleeve, the degree of deterioration of the electrical connection part at that part will be determined. This is the case. At this time, it has already been explained that it is possible to determine the degree of deterioration of the electrical connection portion at the wire connection location including the straight sleeve by measuring the measured electrical resistance data at the wire position of the straight sleeve. I came.
[0037]
However, the present invention can be applied not only when the sleeve is included, but also when the retaining clamp is included as the electrical connection member. For example, when a wire connection structure (referred to as C) composed of “electric wire 33 (main line) —clamping clamp 16 ″ —electric wire 40 ″ (jumper wire)” in FIG. By preparing a sample wire connection structure equivalent to the structure C as a reference object and measuring the data thereof, reference data can be obtained in the same manner as in the case of only the wire or including the sleeve. .
[0038]
According to the present invention, the electric wire to be measured may remain in a live line state, and the current of the live line is used as a measurement current. Therefore, when measuring, it is only necessary to obtain electrical continuity with the measurement object with a simple terminal. The resistance can be easily measured. In addition, even when one side is stopped by two lines, that is, in one-side operation (one-side live line), since the induction wire flows when grounding is performed on the stop side line, the resistance can be measured. In this way, it is possible to measure either a live line or a stop line.
The DC voltage drop method, which is a conventional measurement method, is a method in which a measurement current (DC current) is applied from the outside of a wire that is a twisted wire. Therefore, it is necessary to devise an application from the circumference of the electric wire, and the apparatus has been increased in size and complexity. These problems are solved by the present invention, and the measuring device that travels the electric wire can be reduced in size and weight.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a conductive line for wire corrosion diagnosis according to the present invention, and is an overview of a power transmission line.
FIGS. 2A and 2B are conceptual diagrams showing how reference data is acquired from an example of a reference object. As a reference object, (1) is a configuration of only an electric wire, 2) shows the configuration of electric wire-sleeve-electric wire.
FIG. 3 is a view showing a cross section of an ACSR electric wire (steel core aluminum stranded wire) as an example of an erected electric wire.
FIG. 4 is an example of reference data obtained by the present invention.
FIG. 5 is another example of the reference data obtained by the present invention.
FIG. 6 is a configuration diagram of a self-propelled electric wire inspection device according to the present invention.
FIG. 7 is a diagram showing a difference in measured resistance values at pinpoint terminals according to the present invention.
FIG. 8 is a diagram showing a sequence in the case where resistance measurement relating to an electric wire is performed using the self-propelled electric wire inspection device according to the present invention.
FIG. 9 is a diagram showing a sequence in a case where resistance measurement relating to an electric wire sleeve is performed using the self-propelled electric wire inspection device according to the present invention.
FIG. 10 is a diagram showing a sequence in a case where measurement is stopped during resistance measurement using the self-propelled electric wire inspection apparatus according to the present invention.
FIG. 11 is a diagram showing IO of each block of the self-propelled electric wire inspection device according to the present invention.
[Explanation of symbols]
I, II Locations for diagnosis
10, 20 steel tower
31, 32, 33, 34 Installation electric wire
60, 61, 81 sleeve
16, 16 ', 16''retention clamp
70, 80, 80 'wire
a1, a2, b1, b2 Contact terminal
A, B Standard object
70A, 80B resistance measuring machine
(1) Self-propelled wire inspection device
▲ 4 ▼ Contact probe
4a Contact part
100 electric wires
101, 102 wheels
103 Wheel drive unit

Claims (6)

In a conductive line that has a built-in electric wire and supplies electricity, an electric wire corrosion diagnosis method for diagnosing corrosion by acquiring electrical resistance data at the target location,
The installation electric wire is a stranded conductor composed of a plurality of layers and strands,
The target location is a predetermined location of the installed electric wire, or a predetermined location of the location including the installed electric wire and a member connecting it,
Using a reference object that has the same configuration as the target location and can simulate a state equivalent to the target location, obtain the relationship data of the electrical resistance and corrosion, and the data as reference data in the target location,
In the installed electric wire at the target location, take electrical contact from the electric wire, measure the electric resistance, and obtain it as measured electric resistance data,
By comparing the acquired measured electrical resistance data and the reference data, to obtain a change in the corrosion of the installed wire, to diagnose the degree of corrosion in the target location,
An electrical wire corrosion diagnostic method characterized by the above. In the wire corrosion diagnostic method according to claim 1,
The method of diagnosing electric wire corrosion, wherein the installed electric wire is in a live line state or a stopped state. In the wire corrosion diagnostic method according to claim 1 or 2,
The change in corrosion includes a degree of reduction in the effective cross-sectional area of the installed electric wire or a degree of poor electrical connection between the installed electric wire and a member connecting the installed electric wire. In the electric wire corrosion diagnostic method according to any one of claims 1 to 3,
The acquisition of the measured electrical resistance data at the target location and the acquisition of the reference data using the reference object are data obtained by a resistance measurement method that passes through harmful substances on the surface of the electric wire and takes electrical contact from inside the wire. A method for diagnosing electric wire corrosion, characterized in that it is obtained. In a conductive line that has a built-in electric wire and supplies electricity, it is a wire corrosion diagnostic device that diagnoses corrosion by acquiring electrical resistance data at the target location,
The installation electric wire is a stranded conductor composed of a plurality of layers and strands,
The target location is a predetermined location of the installed electric wire, or a predetermined location of the location including the installed electric wire and a member connecting it,
Using a reference object having a configuration equivalent to the target location and capable of simulating a state equivalent to the target location, obtaining relationship data between the electrical resistance and the degree of corrosion, and obtaining the data as reference data in the target location As a means to obtain
In the installation electric wire at the target location, taking electrical contact from the electric wire, measuring the electric resistance, and obtaining it as measured electric resistance data;
By comparing the obtained measured electrical resistance data and the reference data, obtaining a change in the corrosion of the installed electric wire, means for diagnosing the degree of corrosion in the target location,
An electrical wire corrosion diagnostic apparatus characterized by comprising: In the wire corrosion diagnostic apparatus according to claim 5,
The wire corrosion diagnostic apparatus is configured to include a self-propelled device capable of traveling and moving on the installed electric wire by itself.

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