JPH01185109A - Wire rotation detector and developing method of optical fiber combined overhead ground wire using same - Google Patents

Abstract

PURPOSE:To enable automatic detection of wire rotation without requiring eye monitoring, by containing a moving element in a container having circular inner face then detecting the movement of the moving element through sensors arranged around the container and transmitting signals. CONSTITUTION:An independently movable element 4 is contained in a container 3 having circular inner face. Sensors A-D are arranged around the container 3 in order to detect movement of the moving element 4. Signals detected through the sensors A-D are transmitted in radio waves through a converter/transmitter 6 and received by a receiver 11 located at another position. By such arrangement, rotation of wire 20 can be detected automatically from remote position without requiring eye monitoring. When the device is employed in developing work of the wire 20, developing work can be performed correctly by regulating tension and the like corresponding to rotation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a device for accurately capturing the rotation that occurs in an electric wire when it is extended, and an optical fiber composite overhead installation using the device. This relates to a method of extending wire.

[Prior Art and Problems] For example, when extending an overhead power transmission line, as shown in Fig. 1, metal wheels 31, 31 are suspended from a steel tower 30, 30 in the extension span, and the metal wheels 31, 31 are first suspended. 31.Stretch the pull wire 21 over 31. Next, the electric wire 20 is connected to the second end of the pull wire 21, and the electric wire 20 is wound around the metal wheels 31, 31 by winding the pull wire 21 in the direction of the arrow in the figure using a winch (not shown).
It is a common method to extend the electric wire 20 between predetermined steel towers 30, 30 by exchanging the wires 30, 30.

In this wire-stretching work, winding is performed by the winch while applying braking by the wire-stretching vehicle to prevent the wire 30 from hanging down to the ground and being damaged. Various factors such as the misalignment of the groove of the metal wheel 31 and the direction of the electric wire 20, the stranded wire configuration of the electric wire 20, etc. act to cause the electric wire 20 to rotate. This rotation is
If the number of rotations is low, there is not much of a problem, but if the number of rotations exceeds the permissible number of rotations, depending on the direction of rotation, the strands may tighten and shorten the length of the wire, or conversely, the strands may become loose, causing partial elongation or shortening. This is a major cause of defects.

In particular, when the electric wire being extended is an optical fiber composite overhead ground wire (hereinafter referred to as 0PGW) that houses optical fibers inside, untwisting due to the above-mentioned rotation may occur, causing the strands to bend or stretch locally. There is a risk that the elongation will be transmitted to the optical fiber. The material of this optical fiber is glass, which has a small tolerance for elongation and is extremely prone to breakage. Even if the elongation does not cause breakage, it can cause so-called static fatigue over time. It is known that wires break early and can significantly shorten their lifespan.

Therefore, in the 0PGW wire extension, it is necessary to pay close attention to the rotation of the electric wire during the wire extension.

However, in the past, there was no method for accurately detecting the rotations that occur during the extension of the electric wire, and an operator had to monitor the electric wire with the naked eye and count the direction and number of rotations. In recent years, the voltage of power transmission lines has become commonplace, with ultra-high voltages of 500,000 V or more, and steel towers have also become extremely tall, with overhead wires attached to the tops of the towers.
PGW is extremely visible to the naked eye, and even if it is confirmed using a telescope, it is difficult to continuously monitor it with a telescope.

In addition, fog makes it difficult to see, there are geographical features that make it difficult to see, and if the sun's rays are at your back, it is not only dazzling but also makes it impossible to use a telescope. Not only can you not expect accuracy in what you do, but it is also physiologically impossible.

[Purpose of the Invention] □ The present invention has been made in view of the above-mentioned circumstances, and it eliminates the need for visual monitoring when extending electric wires and automatically corrects the rotation that occurs in the electric wires during the extension. detect,
The purpose of this invention is to provide a rotation detection device that can wirelessly notify the ground of the rotation and a method of extending 0PGW using the rotation detection device.

[Summary of the Invention] That is, the gist of the present invention is that a moving element such as an iron particle is housed in a spherical container having a circular inner surface, a sensor is disposed around the outer periphery of the container, and the moving element is rotated. The sensor is configured to track and detect the movement of the element within the container and wirelessly transmit the signal obtained by the sensor, and such a rotation detection device is connected to the end of the wire. The system automatically tracks and records the rotation of the wire, and based on the results, adjusts the braking of the extension car and the pick-up speed of the engine car to prevent excessive rotation during line extension. This makes it possible to extend the line while preventing it.

[Example] The present invention will be explained below based on Examples.

FIG. 2 is a longitudinal sectional view showing a specific configuration of the rotation detection device according to the present invention.

A strong insulating cylinder 2 such as epoxy is screwed to the other end of the metal case 1, which has a connecting piece 1a at one end, and another connecting piece 1-a is screwed to the other end of the insulating cylinder 2. and constitutes the main body of the detection device 10. Here, the metal case 1 serves not only to ensure strength but also to protect internal components from electromagnetic induction, and the insulating tube 2 is made of a non-metallic material to accommodate a transmitting antenna 8, which will be described later. It is.

A spherical container 3 is housed and fixed within the metal case 1, and heavy particles 4 that are movable independently are accommodated within the spherical container 3. There are no particular limitations on the materials of the container 3 and the particles 4. In other words, it is sufficient to use a material that is well suited to the sensor used, and the material differs depending on the type of sensor. A, B, C, and D are sensors arranged around the container 3 to detect the movement of the particles 4 within the container 3. Regarding sensors, if the movement of particles is to be detected electromagnetically, an electromagnetic sensor may be used, and if the movement of particles is to be detected optically, an optical sensor may be used, depending on the detection method. Just choose the appropriate one.

The signals detected by sensors A, B, C, D are sent to a converter/transmitter 6 via lead wires 5 (or optical fibers in the case of optical sensors).

FIG. 3 is an explanatory diagram showing the conversion/transmission part in more detail, and the signals U, R, D, and L detected by the sensors A, B, C, and D are amplified by the converter 6a. It is configured to be converted into an electrical signal for wireless transmission and wirelessly transmitted by the transmitter 6b and the transmitting antenna 8. In the figure, 11 is a receiver installed on the ground, and lla is a receiving antenna.

Also, 7 in Fig. 2 is an antenna cable,
8 is the transmitting antenna, 9 is a replaceable battery, and 9a is a switch.

FIG. 4 is an explanatory diagram showing the signals indicated by sensors A, B, C, and D based on the state of the particles 4 in the spherical container 3, and the display relationship of the rotational position accordingly. This figure shows a state in which the particles move left and right (b), and a state in which the particles spread left and right due to centrifugal force (c).

If this is explained based on sensor A, it will be as shown below.

(1) Upper U display when sensor C is activated, or sensors B and C are activated, or sensors C and D are activated, or sensors B, C, and D are activated.

(2) Right R display when sensor B is activated, or sensors A and B are activated, or sensors B and C are activated, or sensors A, B, and C are activated.

(3) Downhill display when sensor A is activated, or A and D are activated, or sensors A and B are activated, or sensors A, B, and D are activated.

(4) Left-hand display when sensor D is activated, or sensors C and D are activated, or sensors A and D are activated, or sensors A, C, and D are activated.

As described above, even if the wire is drawn out at a certain angle or the rotational speed is uneven, any of the sensors A, B, C, and D will operate and the rotational position (angle) will be accurately determined. can be detected.

The rotation detection device 10 configured as described above can be applied to any electrical wire that is connected to an overhead line, but by applying it when extending the 0PGW explained earlier as the electrical wire 20, it is possible to extend the 0PGW. Accidents caused by lines can be prevented. That is, as shown in FIG. 1, when the 0PGW 20 is stretched, the rotation detection device 10 according to the present invention is connected between the end wire stretching hardware 22 of the pull wire 21 and the wire extension end of the 0PGW 20. be.

When rotation occurs in 0PGW20, the particles 4 in the spherical container 3
A change occurs in the position of the sensor, which is detected by the sensor. The signal is transmitted continuously as it is, and the receiver 11 is installed at the appropriate drum field or engine field on the ground.
The rotation status of GW is received one by one, the rotation in the raw state is grasped, and the rotation is recorded or displayed. In this way, you can know the rotation of the PGW as if you were holding it in your hands, so you can apply braking or adjust the take-up speed so as not to exceed the allowable rotation speed.
By allowing the line to proceed within a safe range against rotation, future accidents can be prevented.

The rotation monitoring described above is extremely accurate, unlike the conventional method using the naked eye, and there is no risk of inadvertently overlooking the rotation.
This can significantly improve reliability.

As for the shape of the container, it is preferable to use a spherical shape, but as long as the inner surface is formed in a circular shape and the structure is such that the position movement due to rotation can be grasped, a cylindrical shape, a spheroidal shape, or a polygonal shape depending on the case may be selected as appropriate. Can be done. It goes without saying that the moving element is not limited to a particle shape, and any suitable element such as a ball or a gyro can be selected as long as it can change its position relative to the rotation of the container. In the above embodiment, the transmitting antenna is housed in an insulating tube, but it is also possible to use a structure in which the antenna itself is used in common with the connecting piece, and various design changes can be made within the scope of the technical idea of the present invention. Of course you can.

[Effects of the Invention] As described above, according to the rotation detection device according to the present invention, visual monitoring is not necessary, the conventional staff for monitoring the rotation of electric wires is not required, and the rotation speed and direction of rotation can be continuously monitored. This allows workers to carry out wire drawing work while directly and quantitatively confirming the rotation, and in the event that there is a risk of excessive rotation, the wire drawing speed and wire tension can be checked. Since you can immediately respond to this by adjusting the
The present invention has tremendous benefits, such as being able to extend the overhead wires of Golden Week with high reliability and prevent future accidents from occurring.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing how the rotation detecting device according to the present invention is used and wire is extended, Fig. 2 is a vertical cross-sectional view showing the specific configuration of the rotation detecting device, and Fig. 3 is a wireless sensor detection signal. FIG. 4 is an explanatory diagram showing the transmission configuration, and FIG. 4 is an explanatory diagram showing the relationship between sensor signals due to rotation and rotational position. metal case, 2: insulating cylinder, 3: spherical container, 4: moving element, 5: lead wire, 6: conversion transmitter, 8: antenna, 9: battery, 10: rotation detection device, 11: receiver, 20 : Electric wire, 21: Pull wire, A, B, C, D: Sensor. Agent Patent Attorney Fujio Sato

Claims (3)

[Claims] (1) A moving element that is movable independently within the container is housed in a container having a circular inner surface, and a plurality of moving elements that are arranged around the container detect movement of the moving element that moves within the container. A rotation detection device for an electric wire, which includes sensors, a converter that converts a movement signal of a moving element detected by these sensors into an electrical signal for wireless transmission, and a transmitter that wirelessly transmits the electrical signal. (2) The rotation detection device according to claim 1, wherein the container is spherical and the moving element is a heavy particle. (3) By connecting the rotation detection device according to claim 1 to the extension end of the optical fiber composite overhead ground wire and extending the wire, and receiving the radio waves emitted by the rotation detection device, the optical fiber composite overhead ground wire can be A method for extending an optical fiber composite overhead ground wire, in which the number of rotations of the wire is monitored while the wire is being extended, and the wire is stretched while adjusting the drawing speed or tension in accordance with the number of rotations.