JPH0447537B2 - - Google Patents

Description

[Detailed Description of the Invention] <Field of Application of the Invention> The present invention relates to a method for detecting wire tension, particularly a wire tension detection method for detecting wire tension at a portion suspended by a metal wheel for overhead wires, and a method for detecting wire tension for overhead wires used therefor. Regarding the gold wheel.

In the following description, the term "electric wire" is used to include wires used in overhead line work, messenger wires, traction wires, and the like.

<Prior Art> Conventionally, as this type of wire extension tension detection method, a method using an overhead wire wheel equipped with a so-called included angle tension meter is known.

<Problems to be Solved by the Invention> However, the angle-closing tension meter does not detect the problem at the entrance and exit of the overhead wire wheel, which should actually occur due to rotational resistance of the overhead wire wheel or resistance to passing through the protector. It was designed to ignore the difference in wire tension, that is, to assume that the wire tension at the entrance and exit was equal, and was able to only roughly detect the wire tension.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a wire tension detection method capable of detecting with high precision the wire tension generated in the suspended portion of the overhead wire wheel, and a wire wire wheel used therein.

<Means for solving the problem> As a means for achieving the above object, in the wire extension tension detection method of the first invention [the invention set forth in claim 1], The wire is supported by a wire wheel made of a pair of metal wheel wheels that are each suspended by a pair of supported hanging means and are connected in the direction of extension of the wire, and the wire is suspended by each of the hanging means. Measure the forces P and Q and the angle Φ formed by the line segment connecting the wheel center point of each metal wheel and the electric wire, and then calculate these P, Q and Φ.
The gist is to detect the wire tension T ₁ on the entrance side and the wire tension T ₃ on the exit side of the overhead wire wheel, respectively.
In the overhead line metal wheel of the second invention [the invention described in claim 2], a pair of metal wheel wheels are arranged in series in the direction of extension of the electric wire, and each metal wheel is attached to a single fulcrum provided on the steel tower. A pair of hanging means for hanging, a hanging force measuring means for measuring the hanging forces P and Q applied to each hanging means, and an angle Φ formed by the line segment connecting the wheel center point of each metal wheel and the electric wire. The gist is to provide an angle measuring means for measuring the angle.

Incidentally, in the following description, no particular distinction will be made between the two inventions.

<Effect> In other words, the forces P and Q applied to the overhead wire wheel
And actually measure the angle Φ formed between the overhead wire wheel and the electric wire,
From these P, Q, and Φ, the wire tension on the entrance side T ₁ and the wire tension on the exit side T ₃ of the overhead wire wheel are individually detected, so the wire tension can be detected with high precision. This is something that will happen.

<Example> Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

In this wire extension tension detection method, a metal wheel 1 for overhead wire is used.

The overhead line metal wheel 1 includes a pair of metal wheels 2, 2,
A pair of hanging means 3, 3, hanging force measuring means 4, 4 provided on each hanging means 3, 3, and angle measuring means 5, 5 are provided.

The pair of metal wheels 2, 2 are arranged in series in the direction of extension of the electric wire 6, and each is supported by a support frame 7, which is in turn connected to the upper and lower connecting arms 8, 9. are connected.

Each hanging means 3, 3 has an upper connecting arm 8, respectively.
and the metal wheel wheel 2 is suspended from the steel tower 11 via the support frame 7 with the intervention of the hanging cord 10, and each suspending force applied to each hanging means 3, 3 due to the support of the electric wire 6. A load cell is provided as a hanging force measuring means 3 for measuring P and Q.

The angle measuring means 5 is for measuring the angle Φ formed by the electric wire 6 and the line segment DE connecting the wheel center points D and E of the metal wheels 2, 2.
The arm part 14 extends from the sensing part 12 and is always brought into contact with the electric wire 6 at the contact piece 13 at the tip, and the arm part 14 rotates in the direction of arrow A according to the inclination of the electric wire 6. By doing this, the angle Φ is measured. Note that Φ may be measured on either the outlet side or the inlet side, but in this embodiment, the value on the outlet side is measured because it is easier to measure.

Then, from P, Q, and Φ obtained from the hanging force measuring means 4 and the angle measuring means 5,
The inlet side drawing tension T ₁ and the exit side drawing tension T ₃ are determined as the actual drawing tension as follows.

First, FIGS. 2 and 3 will be explained as follows.

The overhead wire wheel 1 as described above can be considered to have a truss structure using pin joints, and the state of the force acting thereon is shown as shown in FIG.
In the figure, each node is indicated by A, B, C, D, E, respectively, and the angle between each member is ∠ ABC is indicated by U,
∠ACB is denoted by V. Also, electric wire 6 is installed on the entrance side.
The angle that it makes with the line segment DE is denoted by η. moreover,
The axial forces of each member are P, Q, R, J1, J2, respectively.
Indicated by G.

When the relationship shown in FIG. 2 is shown as a combination of force triangles around each node and force triangles for external forces, it becomes as shown in FIG. 3. In other words, ``In order for the plane forces at each node to be balanced, a force triangle with sides parallel to each force must be closed. Also, the size of the side is proportional to the size of each force.'' Based on this mechanical principle, Figure 3 is obtained by finding force triangles for the forces around each node and the external forces.

In this Figure 3, at node A, forces F, P,
Since Q is balanced, the force triangle becomes Δαβδ, and the magnitudes of the forces are P=αδ, Q=δβ, and F=αβ. Similarly, at node B, forces P, R, and J1 are balanced, so the force triangle is Δαδζ; at node C, forces Q, R, and J2 are balanced, so the force triangle is Δβζδ, and each The size and direction are determined.
Also, at nodes D and E, forces J1, G,
F1 and the forces J2, G, and F2 form a triangle of forces Δαζε and Δβεζ and are balanced. Also, since the only external forces acting on this system are F, T1, and T3,
These three forces also maintain equilibrium as the triangle of forces becomes Δαβγ. FIG. 3 is thus obtained, in which each external force and the equilibrium force of each member are shown as a Cremonese force diagram indicating their respective magnitudes and directions.

Hereinafter, the calculation for determining the actual wire tension will be explained based on FIG. 3.

In Fig. 3, at Δβγδ, T ₃ /sinV=Q/sinΦ=H/sin(Φ-V)...(a) Therefore, T ₃ =QsinV/sinΦ H=Qsin(Φ-V)/sinΦ At Δαδγ , (π-η)+(η-U)/2=π/2-U/2...(b) (π-η)-(η-U)/2= ATN[P-H/P+Hcot(U /2)] ...(c) (ATN is an arctangent.) From (b) and (c), (π-η) = π/2-U/2+ATN [P-H/P+Hcot(U /2)
]...(d) Therefore, η=π/2+U/2-ATN [P-H/P+Hcot(U/
2)] ...(e) Also, in Δαδγ, T ₁ /sinU=H/sin(η-U)=P/sinη...(f) Therefore, T ₁ =HsinU/sin(η-U)=PsinU/ sinη In this way, the forces P and Q applied to the overhead wire wheel and the angle Φ formed between the overhead wire wheel and the wire are measured, and from these P, Q, and Φ, the entrance extension of the overhead wire wheel is measured. Since the wire tension T ₁ and the exit side wire drawing tension T ₃ are each detected individually, the wire drawing tension can be detected with high accuracy.

<Effects of the Invention> As explained above, this invention actually measures the forces P and Q applied to the overhead wire wheel and the angle Φ formed between the overhead wire wheel and the wire, and calculates the values of P, Q, and Φ. Therefore, since the wire tension on the entrance side T ₁ and the wire tension T ₃ on the exit side of the overhead contact wheel are individually detected, an excellent effect is that the wire tension can be detected with high accuracy. be.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the overhead line metal wheel according to the present invention, FIG. 2 is an explanatory diagram showing the state of force and external force around each node of the overhead line metal wheel, and FIG. It is a combination diagram of the force triangle due to the force in the figure. DESCRIPTION OF SYMBOLS 1, 20... Catenary wire wheel, 2... Metal wheel, 3, 21... Hanging means, 4... Hanging force measuring means, 5... Angle measuring means, 6... Electric wire, 11
...A steel tower.

Claims (1)

[Scope of Claims] 1. An overhead line metalwork comprising a pair of metal wheels that are suspended via a pair of hanging means supported by a single fulcrum provided on a steel tower and are connected in the direction of extension of the electric wire. The electric wire is supported by a car, and the hanging forces P and Q applied to each hanging means and the angle Φ formed by the electric wire and a line connecting the wheel center point of each metal wheel are measured, and this P, A method for detecting wire tension by detecting wire tension T ₁ on the entrance side and wire tension T ₃ on the exit side of an overhead contact wheel from Q and Φ. 2. A pair of metal wheel wheels arranged in series in the direction of extension of the electric wire, a pair of hanging means for suspending each of the metal wheel wheels from a single fulcrum provided on the steel tower, a hanging force P applied to each hanging means, A wire wheel for overhead wires, comprising a hanging force measuring means for measuring Q respectively, and an angle measuring means for measuring an angle Φ formed between a line segment connecting the wheel center point of each wire wheel and an electric wire.