JPH0593664A - Transmission line tension measurement method - Google Patents

Abstract

(57) [Abstract] [Purpose] Tension of a transmission line that can be easily installed by using a tension detection sensor that detects tension from strain and by sandwiching it in the engaging part, and can be applied to installation sites of various shapes Provide a measurement method. [Structure] The tension detecting sensor 8 is provided by being inserted into the engaging portion 7 of the connector 3, and the tension of the power transmission line is obtained from the strain of the tension detecting sensor 8. Further, the tension detecting sensor 8 is provided in the main body 9 that is inserted into the engaging portion and is deformed according to the tension.
And a strain gauge 10 provided on the main body 9 for detecting the deformation of the main body 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the tension of a power transmission line installed between supporting structures such as steel towers, and in particular, it utilizes a tension detecting sensor for detecting the tension from strain to connect them. The present invention relates to a method of measuring tension of a power transmission line, which can be easily installed simply by sandwiching it in an engaging portion of a tool and can be applied to installation sites of various shapes.

[0002]

2. Description of the Related Art Tension for supporting its own weight is applied to a power transmission line installed between supporting structures such as steel towers or a power transmission line being extended. To check the magnitude of this tension,
It is common to insert a measuring instrument into the power transmission line to directly measure the tension, or to check the tension applied to a connecting tool that connects the power transmission line and a supporting structure such as a steel tower. Conventionally, the following two methods are known as such a tension measuring method for a power transmission line.

First, there is a method using a commercially available tensiometer. When using a commercially available tensiometer, the tension of the transmission line cannot be maintained by this tensiometer alone, so a reinforcing device is added to supplement the strength. The reinforcing device accommodates the tensiometer and has one end connected to the power transmission line and the other end connected to the connector, and the tension meter can be operated at any time to measure the tension.

The second method is a method of detecting the strain of the above-mentioned connecting tool and obtaining the tension applied to the connecting tool from this strain, and more specifically, a strain gauge is applied to a metal fitting for supporting the tension such as a retaining metal fitting or a clevis link. Paste the j. The strain gauge changes the electric resistance value according to the strain. By measuring the resistance value (or current value) of the strain gauge attached to the connector, the magnitude of the strain of the connector can be known. Based on this, the tension applied to the power transmission line is measured. be able to.

[0005]

The reinforcing device used in the first method is relatively large in size and shape to support tension. Therefore, the handling is troublesome and a problem. Further, since the length of the power transmission line is increased by inserting the reinforcing device between the power transmission line and the coupling tool, it is necessary to perform work for shortening the length.

On the other hand, in the second method, it is only necessary to attach a strain gauge to the retaining metal fittings, clevis links, etc., but the retaining metal fittings and clevis links have different shapes depending on the steel tower. It is necessary to prepare the strain gauges to be attached to these as well, each having a corresponding shape. It is not easy to manufacture various strain gauges having different shapes as described above, and the cost is high, which is uneconomical.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and to utilize a tension detecting sensor for detecting tension from strain, and by simply sandwiching the tension detecting sensor in an engaging portion of a connecting tool, it is possible to install easily and variously. An object of the present invention is to provide a method for measuring the tension of a power transmission line that can be applied to a shape installation site.

[0008]

In order to achieve the above-mentioned object, the present invention provides a tension detecting sensor inserted in an engaging portion of a connecting tool, and obtains the tension of a transmission line from the detected value of the tension detecting sensor. I chose

When the power transmission line is held by the pair of clevis links, a tension detecting sensor is inserted between the pair of clevis links engaging with each other, and the tension of the power transmitting line is obtained from the detected value of the tension detecting sensor. I chose

Further, a tension detecting sensor is inserted between a metal fitting for holding the tension of the power transmission line and a bolt engaged with the metal fitting for stopping the metal fitting, and the value of the power transmission line is detected from the detected value of the tension detecting sensor. I tried to find the tension.

Further, a tension detecting sensor is constituted by a main body which is inserted into the engaging portion of the connecting tool and is deformed in accordance with the tension, and a strain gauge which is provided in the main body and detects the deformation of the main body. I tried to find the tension of the transmission line.

Further, a main body which is inserted into the engaging portion of the connector and is deformed in response to tension, a pair of optical fibers which are opposed to each other in the main body, and a main body which is provided between these optical fibers. The tension detection sensor is configured by a shutter that shields the optical fibers from each other according to the deformation of the above, and the tension of the transmission line is obtained.

[0013]

According to the above method, a compressive force acts on the tension detecting sensor inserted in the engaging portion of the connecting tool in correspondence with the tension of the power transmission line, and the tension detecting sensor body is deformed to generate strain according to the tension. .. When the magnitude of this strain is obtained from the resistance value of the strain gauge or the amount of light attenuated by the optical fiber and converted into tension, the tension of the transmission line is measured.

The tension detecting sensor can be installed simply by sandwiching it between a pair of clevis links engaging with each other or between a metal fitting and a bolt. In addition, since the device can be installed by simply sandwiching it in the engaging portion of the connector in this way, the tension detection sensor having the same shape can be applied to installation sites having various shapes.

[0015]

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

As shown in FIG. 1, between a steel tower member 1 which is a part of a steel tower supporting a power transmission line and an insulator 2 which insulates and holds the power transmission line, a pair of connecting members 3 is formed. Clevis links 4 and 4 are provided. The clevis link 4 is a U-shaped metal member, one open base end 4b of which is rotatably locked to the tower member 1 by a bolt 6 and one is attached to the insulator 2. It is rotatably locked by 6. The clevis link 4 connects the tower member 1 and the insulator 2 by engaging the U-shaped tip portions 4a, 4a with each other. Therefore, a tension equal to the tension of the power transmission line is applied to the U-shaped tip portions 4a, 4a. In the method of the present invention, the U-shaped tip portions 4a, 4
The tension detecting sensor 8 is inserted into the engaging portion 7 where a is engaged with each other. That is, the tension detection sensor 8 is the U-shaped tip 4
Since it is sandwiched between a and 4a, it receives a compression force equal to the tension applied to the connector 3. Although not shown,
A measuring circuit for processing the detection signal of the tension detecting sensor 8 and displaying the tension is connected to the tension detecting sensor 8.

As shown in FIG. 3, the tension detecting sensor 8 detects the deformation of the main body 9 which is inserted into the engaging portion and is deformed according to the tension, and the main body 9 which is provided in the main body 9. It is composed of a strain gauge 10. Distortion
The di 10 can detect strain in one direction and can be represented by a change in resistance value. In this embodiment, the main body 9 is a hexahedron, and four strain gauges 10 are attached to the four surfaces which are not in contact with the clevis link 4. One of these four strain gauges 10 is arranged with its measuring direction oriented in the direction of the tension applied between the clevis links 4, and the other three are arranged with their measuring direction between the clevis links 4. It is arranged so as to be oriented in the direction perpendicular to the applied tension.

The measuring circuit connected to the four strain gauges 10 constitutes a bridge circuit using the four strain gauges 10. Tension detection sensor body 9
The magnitude of the distortion of will appear as a change in the balanced current of this bridge circuit.

As described above, since the tension detecting sensor 8 is sandwiched between the U-shaped tip portions 4a, 4a, it receives a compressive force equal to the tension applied to the connector 3, and the tension detecting sensor main body corresponding to this compressive force. Since the magnitude of the strain of 9 appears as a change in the balanced current of the bridge circuit, the tension applied to the connector 3, that is, the tension of the transmission line will be measured.

As shown in the drawing, the tension detecting sensor 8 can be formed small enough to be inserted between the clevis links 4, so that it is easy to insert and no special reinforcing member is required.

Next, another embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, between the steel tower member 1 which is a part of the steel tower supporting the power transmission line and the insulator (not shown) which insulates and holds the power transmission line, U is connected between them. A letter-shaped clevis link 4 is provided. The clevis link 4 is positioned so as to sandwich the end 1a of the steel tower member 1 between the open base ends 4b. The base end portions 4b, 4b and the end portion 1 of the steel tower member 1 sandwiched therebetween.
A circular hole 11 penetrating these is provided in a. A bolt 6 having a diameter smaller than the inner diameter of the circular hole 11 is loosely fitted and inserted into the circular hole 11, and nuts are attached to both ends of the bolt 6. Therefore, the clevis link 4 is rotatably locked in the circular hole 11 by the bolt 6. That is, the clevis link 4 is a metal fitting 15 for holding tension, and constitutes the connecting tool 3 together with the bolt 6 engaged with the metal fitting 15. A pressing force equal to the tension of the power transmission line is applied to the side surface of the bolt 6 corresponding to the engaging portion 7 of the coupling tool 3 and the inner side surface of the circular hole 11. In the method of the present invention, the tension detecting sensor 8 is inserted into the engaging portion 7 where the bolt 6 and the circular hole 11 engage with each other. That is, since the tension detection sensor 8 is sandwiched between the bolt 6 and the circular hole 11,
A compressive force equal to the tension applied to the connector 3 will be received. Although not shown, a measuring circuit for processing the detection signal of the tension detecting sensor 8 and displaying the tension is connected to the tension detecting sensor 8.

The tension detecting sensor 8 used here is the same as that used in the above-mentioned embodiment. Therefore, similarly to the above-described embodiment, the tension detecting sensor 8 receives a compressive force equal to the tension applied to the coupling tool 3, and the magnitude of the strain of the tension detecting sensor main body 9 corresponding to this compressive force depends on the balance of the bridge circuit. Since it appears as a change in the electric current, the tension applied to the connector 3, that is, the tension of the transmission line is measured.

Next, some other configurations of the tension detecting sensor 8 and a measuring method using the same will be described.

As shown in FIG. 4, the tension detecting sensor 8
Is composed of a main body 9 which is inserted into the engaging portion and deforms according to tension, and a strain gauge 10 which is provided in the main body 9 and detects deformation of the main body. The main body 9 is a hexahedron, and a gap 12 is provided between two surfaces in contact with the engaging portion at a right angle to the direction of the compressive force, and the strain gauge 10 is sandwiched in the gap 12. The strain detection direction of the strain gauge 10 is perpendicular to the direction of the compressive force. The strain gauge 10 can detect the elongation strain in the direction perpendicular to the compression of the main body 9.
The tension applied to the connector 3, that is, the tension of the power transmission line is measured from the detected value of the elongation strain.

FIG. 5 shows a tension detecting sensor for obtaining the magnitude of strain corresponding to the tension of the tension detecting sensor body from the attenuation light amount of the optical fiber and a measuring method using the same. As illustrated, the tension detecting sensor 8 is inserted into the clevis links 4 and the engaging portions 7 of the clevis links 4 and 4. Tension detection sensor 8
Is a body 9 that is deformed according to the tension, a pair of optical fibers 13 provided to face each other in the body 9, and a space between the optical fibers 13 that is provided between the optical fibers 13 and that is deformed in accordance with the deformation of the body 9. And a shutter 14 that operates. A light source that supplies a predetermined amount of light is connected to one side of the optical fiber 13, and the other side of the optical fiber 13 detects the amount of light that has passed through the optical fiber 13 and the main body 9 and compares it with the amount of light from the light source. A light quantity measuring circuit is connected. When the body 9 is compressed by the clevis link 4, the attenuated light amount measuring circuit can determine the magnitude of deformation of the body based on the light amount comparison. That is, the tension of the power transmission line can be measured from the measurement of the amount of light attenuated by the optical fiber 13.

FIG. 6 shows a measuring method in which the optical tension detecting sensor 8 shown in FIG. 5 is used for the engaging portion of the bolt 6 shown in FIG. A bolt 6 for stopping the clevis link is loosely fitted and inserted into a circular hole 11 provided in the end portion 1a of the steel tower member 1 that supports the tension of the power transmission line. In FIG. 6, tension is applied in the direction of pulling the bolt 6 to the left. By inserting the optical tension detecting sensor 8 between the bolt 6 and the circular hole 11 forming the engaging portion 7, the tension detecting sensor 8 is inserted.
Installation is achieved. When the main body 9 is compressed according to the tension, the shutter 14 moves to move the end face 13 of the optical fiber 13.
It is shown that a is blocked. Since the shutter 14 blocks the end surface 13a of the optical fiber 13 in this manner, the tension of the power transmission line can be measured from the measurement of the amount of attenuated light.

[0028]

The present invention exerts the following excellent effects.

(1) Since the tension detecting sensor is shaped so as to be sandwiched between the engaging portions, it can be formed in a relatively small size and is easy to handle.

(2) Installation is easy because it is only sandwiched between the engaging parts.

(3) Since the tension detecting sensor having the same shape can be applied to the installation parts having various shapes, mass production becomes possible and the cost can be reduced.

(4) With the optical tension detecting sensor, safe and less noise measurement is possible even in a high voltage environment.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the method of the present invention.

FIG. 2 is a schematic diagram showing another embodiment of the method of the present invention.

FIG. 3 is a perspective view showing an embodiment of a tension detecting sensor according to the present invention.

FIG. 4 is a three-dimensional view showing another embodiment of the tension detection sensor according to the present invention.

FIG. 5 is a schematic view showing another embodiment and measuring method of the tension detecting sensor according to the present invention.

FIG. 6 is a schematic view showing another embodiment of the tension detecting sensor and the measuring method according to the present invention.

[Explanation of symbols]

 3 Connecting tool 4 Clevis link 6 Bolt 7 Engaging part 8 Tension detection sensor 9 Tension detection sensor body 10 Strain gauge 13 Optical fiber 14 Shutter 15 Metal fitting

Claims (5)

[Claims] 1. A method for measuring the tension of a power transmission line supported by a support structure such as a steel tower via a connecting tool, wherein a tension detecting sensor is provided by being inserted into an engaging portion of the connecting tool. A tension measuring method for a power transmission line, characterized in that the tension of the power transmission line is obtained from a detected value. 2. The tension measuring method for a power transmission line according to claim 1, wherein the connector comprises a pair of clevis links, and a tension detecting sensor is inserted between the clevis links. 3. The connector according to claim 1, wherein the connector comprises a metal fitting for holding tension and a bolt engaged with the metal fitting, and a tension detecting sensor is inserted between the metal fitting and the bolt. Transmission line tension measurement method. 4. A tension detecting sensor is composed of a main body that is inserted into an engaging portion of a connecting tool and that is deformed according to tension, and a strain gauge that is provided in the main body and that detects deformation of the main body. A method for measuring the tension of a power transmission line, comprising: 5. A main body in which a tension detecting sensor is inserted into an engaging portion of a connecting tool and deforms according to tension, a pair of optical fibers provided in the main body so as to face each other, and these optical fibers. A tension measuring method for a power transmission line, comprising: a shutter provided between the optical fibers to shield the optical fibers from each other according to deformation of the main body.