JPH01313710A - Detector for looseness degree of overhead wire - Google Patents

Abstract

PURPOSE:To convert a time aging of a catenary to an electric signal, to read the fluctuation quantity of the catenary with high accuracy from a deviation of a voltage and to immediately calculate a looseness degree by placing an angle sensor having a servo-mechanism on an electric wire. CONSTITUTION:The title device is provided with a roller which can run on an electric wire 1, and a servo-inclination angle sensor S1 on its frame 12. The sensor S1 is connected to an operation display device 14 by a lead wire 13. As a matter of fact, the roller 11 does not run, and the frame 12 is supported and fixed by a supporting rope 15 to a supporting structure of a steel tower side, and the electric wire 1 which is being drawn moves under the roller 11. Each catenary theta1 of the electric wire 1 is always fluctuated by whether wire drawing tension of the electric wire 1 is large or small, or a brake in a snatch block 4, or partial run-in of the electric wire, etc. The fluctuation of the angle theta1 is detected by the sensor S1, and its signal is inputted to the operation display device 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overhead wire sag detection device that can easily and quickly measure the sag of an overhead wire with high accuracy.

[Prior art] Overhead wires are stretched between steel towers, but if the tension is too strong, abnormal tension will be applied to the wires due to heat shrinkage due to outside temperature and wind pressure load, and if the tension is too small, the wires will be subjected to abnormal tension. Ground insulation spacing becomes a problem. Therefore, overhead wires must be installed with appropriate slack, and slack measurement during overhead line construction is essential.

Furthermore, when extending overhead lines, the wires are passed onto metal wheels suspended from steel towers.

At this time, the wires are stretched while applying braking with the wire rolling cars to prevent the wires from running in and hanging down to the ground, damaging the wires themselves or destroying the structures they are being carried down.

However, in recent years, overhead power transmission lines have become increasingly high-voltage, with larger steel towers, longer overhead wire spans, and larger, multi-conductor transmission lines. The length of the line now extends to several kilometers.

In such long-distance extensions, even if braking is applied by the extension cars at the drum field, it is only possible to control the average tension in the middle spans of the towers; It often happens that electric wires run in and hang down a lot. Since such tension and sagging appear as changes in the slackness of the wires during the extension of each steel tower, measurement of the slackness of the wires during the extension has also become a very important issue.

Conventionally, the slackness of overhead wires has been measured using the following method.

First, the steel tower Tl shown in Fig. 14 is used during line tension work.

When trying to find out the slackness of the electric wire 1 that is connected between T2, install a vertex 3 with a scale on one of the steel towers T2, install a compass 2 with a telescope on the steel tower T1 (l!1), and use the vertex 3 as a compass. The measurement was carried out by reading the sagging d based on the standard 2.

However, in the case of wire-stretching work, it is difficult to directly measure the slackness of the electric wire 1 during wire-stretching as described above. Therefore, an angle detector 5 having an arm 6 as shown in FIG.
A method has been adopted in which the catenary angle of the "1! wire 1" during wire stretching is detected by the amount of rotation of the arm 6, and the slackness is determined based on this angle.

[Problem to be solved by the invention] The original sag of the electricity iii is determined by the tower arm T shown in Fig. 15.
The sag is aO with the point P-s directly below a as the observation point, but the sag measured using the standard method shown in FIG. 14 is the sag dl measured from the P-2 point on the tower leg, An error Δd shown in FIG. 15 occurs.

This error increases as the tower becomes larger, so it cannot be ignored between towers with horizontal angles or large height differences.

In the method using the arm 6 shown in Fig. 9, the detection angle is very rough and can only be used as a rough guide.Moreover, the axis of the metal wheel 4 during wire drawing can vary from Ps in Fig. 10 due to the wire tension. It may be swung in the linear direction to P2. Then, the safe enters the 4- position and the arm 6 also moves to the 6- position. Although the catenary of the electric wire 1 hardly changes, the angle detector 5 operates as if it had changed from the angle α1 to the angle α2, resulting in a large error.

In addition to this, there are steel towers Ts as shown in Figure 11.

If there is a horizontal angle between T2 and T3, even if the roller 7 of the arm 6 is made considerably long, it will come off the wire 1 and measurement will not be possible.

In addition, as shown in FIG. 12, there are steel towers T2 on both sides of the measurement tower Tl. If T3 is higher, increasing the tension of the wire 1 will cause the wire 1 to rise from the groove of the metal wheel 4, making it impossible to detect the angle. Even if a presser foot wheel 8 is installed as shown in Fig. 13 to suppress this lifting, the detected value only shows a value different from the initial angle, making it unsuitable as an angle detector for wire stretching. It is.

The purpose of the present invention is to solve the above-mentioned problems of the conventional technology, to automatically detect the catenary of the wire quickly and with high precision simply by simply installing it on the wire, and to immediately calculate the catenary of the wire using a calculator. The present invention aims to provide a novel slackness detection device that can directly read the wire slackness at that time.

[Means for Solving the Problems] The present invention installs a servo inclination angle sensor capable of automatically detecting an angle on an electric wire, inputs the detection angle detected by the sensor into a calculator, and calculates the angle of a known span length. The structure is such that the electric wire sag can be immediately calculated and displayed using a calculator by inputting the height difference and the height difference.

[Function] By using an angle sensor with servo aS, it is possible to immediately convert the change over time in the catenary of the wire into an electrical signal, read the amount of change in the catenary from the voltage deviation with high precision, and input it to the computing unit. I can do it. Since the sag can be calculated instantly using a program set in the calculator, workers can directly read the actual sag detected with high precision while conducting line extension or tensioning work, ensuring peace of mind and efficiency. This allows for good overhead line work to be carried out.

[Example] The present invention will be described below with reference to the drawings.

Fig. 1 shows a sag detection device 1 according to the present invention installed on an electric wire 1 that is being extended between steel towers Tl, T2, etc., and monitoring changes in the sag of the electric wire 1 that is being extended. FIG. 2 is an explanatory diagram showing the specific configuration of the slackness detection device-10.

A servo tilt angle sensor Sl is provided on a frame 12 supported by rollers 11, 11 that can run on electric wires 1, and the sensor 31 is connected to an arithmetic display device 14 by a lead wire 13.

Actually, the rollers 11, 11 do not run, the frame 12 is supported and fixed to the steel tower side support by the support rows 115, and the electric wire 1 being extended moves under the rollers it, tt.

The catenary angle θl of the electric wire 1 constantly fluctuates depending on the magnitude of the wire tension of the electric wire 1, the braking on the metal wheel 4, the partial running of the electric wire, etc.
The sensor S1 tracks and detects the fluctuation of l, and the detection signal is displayed on the calculation display! 14 to input.

FIG. 3 is an explanatory diagram of the operation of the sag detection device 1 unit.

The catenary signal of the wire detected by the sensor Sl is amplified into an electrical signal by the amplification converter AMP, and the voltage thereof is displayed on the angle meter Ml. The angle meter Ml has a scale of 0 to 5, for example, OV is Oo and 5 is 9.
0'.

M2 is a deviation meter and is connected to potentiometer PM. CX is a magnification switch that changes the detection magnification of the potentiometer PM by appropriately selecting a resistor R. As a result, the minute angular fluctuations detected by the sensor Sl are displayed in an enlarged manner on the deviation meter M2 with high accuracy.

OPE is a computing unit, into which the voltage-converted version of the angle signal detected by the sensor S1 is inputted one by one. Arithmetic unit O
The known overhead wire span length S and the height difference H between the wire support points are separately input to the PE, and a program that can calculate the slack of the wire 1 based on these data is incorporated.

FIG. 8 is an explanatory diagram showing the overhead wire span S and the height difference H.

The slackness d of the electric wire 1 is determined by the following formula.

(a) In the case of a steel tower on the high side (b) In the case of a steel tower on the low side In both equations (1) and (2), S and H are known, and once θ1 is determined, the sag d can be calculated immediately. I understand.

The sag calculated by the calculator OPE is numerically displayed on the display DM, and by directly reading it, the operator can instantly know the fluctuations in the sag during wire extension.

In the above case, there is no lateral vibration in the servo tilt angle sensor Sl, and the fifth
As shown in the figure, we have shown an example where the catenary angle θ1 of the wire can be detected correctly, but the top of the steel tower is often subject to strong wind pressure, which causes the sensor S1 to oscillate by θ2 as shown in Figure 6. may occur. The angle detected when the sensor 31 is tilted sideways by θ2 is not the correct angle θ1. Therefore, when performing detection work in strong winds, as shown in FIG. A sensor S2 is provided, and the result detected by the second sensor S2 is inputted to the calculation display device 14 as shown in FIG.
It is desirable to be able to perform calculation correction to the correct value θl.

However, if the sensor S1 has a structure in which the angle detection ability does not change due to lateral vibration, it is not necessary to add the second sensor S2.

The above description has been given by way of example of detecting slack during wire stretching, but it goes without saying that the device according to the present invention can also be applied to wire tensioning work, in which case wire gripping members may be used instead of rollers. You can.

It is also possible to connect wirelessly without using lead wires, which can further simplify the work.

[Effects of the Invention] As described above, according to the device according to the present invention, it is possible to perform wire stretching or tensioning while continuously and accurately grasping changes in sag, and it is possible to improve the accuracy and efficiency of overhead wire work. The effect of promoting efficiency is extremely large.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing how wire is extended using the device according to the present invention, Fig. 2 is an explanatory diagram showing an embodiment of the device according to the present invention, and Figs. Two types of explanatory diagrams showing the operating system of the device, Figures 5 to 7 are explanatory diagrams related to lateral vibration of the sensor, Figure 8 is an explanatory diagram of the components for calculating sag, and Figure 9 is an explanatory diagram of the conventional catenary. An explanatory diagram showing a detection device,
Figures 10 to 13 are explanatory diagrams showing problems in practical use of conventional catenary detection devices, Figure 14 is an explanatory diagram showing a conventional sag measurement method, and Figure 15 is an explanatory diagram showing the sag measurement method shown in Figure 14. FIG. 3 is an explanatory diagram showing problems when making measurements. 1: Electric wire, 4: Metal wheel, 10: Slack detection device, 13: Lead wire, 14: Arithmetic display device, Ss, S2: Servo tilt angle sensor. Agent Patent Attorney Fujio Sato Figure 1 Figure 3 14 Figure 4 14 Figure 6 Figure 5 b. Figure 7 Figure 11 Figure 14 Figure 15

Claims (2)

[Claims] (1) A servo inclination angle sensor that can be installed on a wire, an amplification converter that amplifies and converts the inclination angle detected by the sensor into an electrical signal, and a calculator that calculates the wire sag based on the electrical signal. and a display device for displaying the result. (2) A first servo tilt angle sensor that can be installed on the electric wire, a second servo tilt angle sensor that detects the lateral deflection angle of the first servo tilt angle sensor, and these first and second servo tilt angle sensors. an amplification converter that amplifies and converts each inclination angle detected by the inclination angle sensor into an electrical signal; a calculator that inputs each of the electrical signals to calculate wire slack; and a display that displays the calculation results. An overhead wire slack detection device comprising: