JPH0252367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vertically arranged multiple tension insulator device in which a plurality of insulator chains are arranged vertically and vertically.

(Prior Art) Conventionally, as a multiple tension insulator device attached to the tower body 11, one in a horizontal arrangement as shown in FIG. 6 has been used. This horizontally arranged insulator device 15 is exposed to snow in cold and snowy regions, and this snow can sometimes deform the metal fittings of the insulator device 15 or reduce its withstand voltage characteristics.

Therefore, in order to reduce the snow cover of the insulator device 15, for example, a vertically arranged multi-strand tension insulator device 15 in which insulator chains are arranged vertically as shown in FIG. 7 is provided.

This insulator device 15 roughly includes a long insulator 3,
The insulator chains 1A, 1B each having one or more 3.
Both ends of B were connected to shafts P2 and P3, which are connecting portions of the tower-side yoke 2C and the conductor-side yoke 2D, respectively. A shaft P is a connecting portion between the tower body 11 and the conductor 13 and both yokes 2C and 2D.
1, P1, upper insulator chain 1A and both yokes 2C, 2
The shafts P2, P2 are the connecting portions with D, and the shafts P are the connecting portions between the lower insulator chain 1B and both yokes 2C, 2D.
3, it was installed at the vertical center position with P3. That is, the axis H2 connecting the axes P2, P2 and the axes P1, P1
The distance from the device axis H1 that connects is 1, and the axis P
The axes P1 and P1 were provided so that, if the distance between the axis H3 connecting the lines H3 and P3 and the device axis H1 was 2, then 1≈2.

(Problems to be Solved by the Invention) However, both yokes 2C of the insulator device 15,
2D is originally similar to a balance yoke used in horizontally arranged multiple tension insulator devices. Therefore,
When this is used in a vertically arranged multiple tensile insulator device such as the insulator device 15 on a power transmission line, twisting of the conductor 13 such as a high voltage line attached to the compression clamp 12 and the effect of wind pressure Accordingly, both yokes 2
A twisting force acts on C and 2D around the device axis H1 on the conductor side and the tower side, and in particular, the yoke 2D on the conductor side twists, causing the axes P1 and P1 on the tower side and the conductor side,
Deformation occurred in the axes P2, P3 of the long insulators 3, 3, or the longitudinal (vertical) arrangement of the upper and lower insulator chains 1A, 1B collapsed, resulting in a diagonal arrangement. As a result, during snowfall, not only are both insulators 1A and 1B more likely to be covered with snow, but
Due to the snow cover, the arrangement balance of the insulator chains 1A and 1B may be disrupted, and the axes P1 and P1 on the conductor side and tower side may
There was a risk that the metal fittings would be deformed.

The object of the present invention is to provide a vertically arranged multi-strand tension-resistant insulator device that can maintain a stable arrangement of insulator chains against the effects of twisting of conductors, wind pressure, etc.

Structure of the Invention (Means for Solving Problems) This invention comprises a tower body side yoke 2A connected to the tower body 11 at one point by a connecting portion P1, and a conductor 13.
On the other hand, a plurality of insulator chains 1A and 1B are vertically connected in parallel at a predetermined interval between the conductor side yoke 2B connected at one point by the connecting portion P1.
And the connection parts P1 and P on the tower body side and the conductor side
1 to the axis H1 of the upper insulator chain 1A so that the moment of inertia of the lower insulator chain 1B is larger than the moment of inertia of the upper insulator chain 1A.
2 and the axis H3 of the lower insulator chain 1B.

(Function) By employing the above-mentioned means, the present invention functions as follows.

In the vertically arranged insulator series, the area of the insulator device as a whole is reduced in the horizontal direction, and the spread of continuous snow cap in the same direction is reduced.

Furthermore, the moment of inertia of the lower insulator chain is larger than the moment of inertia of the upper insulator chain, centering on the device axis passing through the connection parts on both sides of the insulator device with respect to the tower body and the conductor, The moment of inertia of the insulator device increases,
Compared to conventional insulator devices, twisting is less likely to occur with respect to the twisting torque of the conductor.

Further, due to the difference in the moment of force due to gravity between the upper and lower insulator chains, the insulator device is always in a stable vertically arranged state even if rotational force due to wind pressure or the like is applied.

(Example) Hereinafter, an example embodying this invention will be described in the first to
This will be explained in detail according to FIG.

In the drawing, reference numeral 1 indicates the entire insulator device, and roughly speaking, both ends of insulator chains 1A and 1B as upper and lower tension insulators arranged vertically in parallel, that is, vertically, are connected to a tower side yoke 2A, respectively. It is configured to be connected to the conductor side yoke 2B.

To explain in detail the double insulator chains 1A and 1B, 3 is a long insulator made of solid porcelain with cap fittings 4, 4 attached to both ends, and two insulators are connected in series by a horn fitting 5. They are connected to form upper and lower insulator chains 1A and 1B, respectively. 6
are horn mounting brackets attached to both ends of both insulator chains 1A and 1B, and 7 and 7 are a pair of arc horns attached to the horn attachment brackets 5 and 6, respectively, at both ends of each long insulator 3. .

Further, both ends of the insulator chains 1A and 1B are vertically rotatably connected to shafts P2 and P3, which are connecting portions of the yokes 2A and 2B, via right-angled clevis links 8 and 8, respectively.

9, 9 are the yokes 2 on the tower side and conductor side, respectively.
This is a parallel clevis that is rotatably connected in the vertical direction to the shafts P1 and P1, which are the connecting portions of A and 2B. The device axis H1 that connects the shafts P1 and P1 is the axis H2 of the upper insulator chain 1A that connects the shafts P2 and P2 that are the connection parts of the upper insulator chain 1A and both yokes 2A and 2B,
It is located between the axis H3 of the lower insulator chain 1B that connects the shafts P3, P3, which are connecting portions of the lower insulator chain 1B and both yokes 2A, 2B. Then, the distance between the device axis H1 and the axis H2 is set to 1, and the device axis H1 and the axis H2 are
Assuming that the distance from ing.
That is, the parallel clevises 9, 9 of both the yokes 2A, 2B are connected to the upper insulator series 1A and the lower insulator series 1B.
Upper insulator chain 1A than the intermediate position in the vertical direction with
It is an eccentric yoke mounted in a side position. The lower limit of the range of 0.3 < 1 < 2 < 0.83 in the above formula is appropriate to be 400 mm when the distance between insulators 1A and 1B is normal, and the distance from the center to the lower end ensures clearance with the jumper wire. Since up to 300mm is suitable, 1 = 100mm 2 = 300mm, and 1/2 = 0.3. In addition, the upper limit of the same range is determined by the fact that the shared load on the insulator chain is below the safety factor of 2.5.
For example, considering the wire tension up to 8.8 tons, in a 12-ton insulator chain, if the position of the lower insulator chain is determined so that the allowable load of 4.8 tons is applied to the upper insulator chain, 2 = 1.21, and 1/2 = 0.83. be done.

Furthermore, 10 is a right angle clevis link which is connected to the parallel clevis 9 of the tower side yoke 2A so as to be rotatable in the vertical direction, and connects one end of the insulator device 1 to the tower body 11.
It is connected to allow rotation in the horizontal direction. Reference numeral 12 denotes a compression clamp for gripping a conductor 13 such as a high voltage line which is connected to the parallel clevis 9 of the conductor side yoke 2B so as to be rotatable in the vertical direction, and a compression clamp 12a for a jumper wire 13a is provided at the base end of the clamp. It is provided.

Next, the operation of the vertically arranged multiple tension insulator device constructed as described above will be explained.

In general, the magnitude of inertia for rotational motion of an object, that is, the moment of inertia (denoted as I), is determined by the mass of each part of the object (denoted as m) and the distance from the center of rotation to each part (denoted as). It is expressed as the product of the square of .

That is, I=m ² (unit: Kgm ² ).

Here, the above-mentioned insulator device 1 will be explained as a model.

First, let the mass of the entire insulator device 1 be M,
Since most of the mass is concentrated in the upper and lower insulator chains 1A and 1B, the masses of the upper and lower insulator chains 1A and 1B are similarly set to 0.5M, respectively, and the distance from the device axis H1 (1 , 2) are respectively assumed as follows.

1=0.3L, 2=0.7L (1+2=L, 1/2=0.43) At this time, the moment of inertia I of this insulator device 1, that is, the magnitude of the resistance to twisting of the insulator device 1 is 1A moment of inertia (I
1) and the moment of inertia (I2) of the lower insulator chain 1B.

That is, I=I1+I2. Therefore, I=0.045ML ² +0.245ML ² =0.29ML ² .

On the other hand, regarding a conventional insulator device, if all other conditions are the same as above, the mass of each of the upper and lower insulator chains 1A and 1B is 0.5M, and the distance from the device axis H1 is 1=2=0.5L, then the inertia The moment I can be expressed as: That is, I=I1+I2= ^0.125ML2 + ^0.125ML2 = ^0.25ML2 . Therefore, 0.29ML ² > 0.25ML ² .

That is, the eccentric yoke 2A like this invention,
2B, the conventional balance yoke 2C,
Compared to the use of 2D, the moment of inertia I of the insulator device as a whole becomes larger. Therefore, even if a twisting action (for example, twisting force of a high voltage line) is applied to the insulator device 1 about the device axis H1, this insulator device 1 is less likely to be twisted than the conventional insulator device 15.

Here, the relationship between the twisting action acting on the insulator device 1, that is, the twisting torque, and the twisting angle of the conductor side yokes 2B and 2D is as follows: 1/2=0.67 for an eccentric yoke, 1/2= FIG. 2 shows the results of experiments conducted on insulator devices 1 and 15 using conventional balance yokes.

As is clear from the figure, the eccentric yoke 2B always has a smaller twist angle than the conventional balance yoke 2D, and the insulator device 1 using the eccentric yoke 2B of the present invention uses the conventional balance yoke 2D. It can be seen that the insulator device 15 is less likely to be twisted than the insulator device 15 that was previously used. The resistance to twisting, that is, the moment of inertia I, increases as the value of 1/2 decreases, and the insulator device 1 becomes even more difficult to twist.

Next, the effect of gravity on this insulator device 1 will be explained with reference to FIGS. 3 to 5.

By the way, in general, the effect on the rotation of an object,
In other words, the moment of force (denoted as N) is the length of the arm, that is, the distance from the center of rotation to the point of application of the force (determined), and the force acting perpendicularly to the length of the arm (denoted as N). F).

That is, N=F [Unit: Nm] becomes.

Therefore, as shown in FIG. 3, the gravity always applied to the vertically arranged insulator devices 1 is mainly the gravity W1 of the upper insulator chain 1A and the gravity W2 of the lower insulator chain 1B.
The length of the arm up to the upper insulator series 1A is 1, and the length of the arm up to the lower insulator series 1B is 2 (2>1)
Since the insulator device 1 does not act at right angles to the insulator device 1, it is not rotated. Therefore, the insulator device 1 is supported in a stable vertical arrangement.

However, from the side of the insulator device 1, for example,
When rotational force F acts on the lower insulator chain 1B around the device axis H1 due to wind pressure, etc., gravity W1,
W2 produces a reaction as a moment of force that resists the rotation of the device 1.

That is, in this insulator device 1, as shown in FIG.
The moment of force (assumed to be N1) is the product of the force component F1 acting perpendicular to The applied gravity W2 is the arm length 2
A difference in the moment of the force between the force and the force component F2 acting perpendicular to the force (denoted as N2) occurs, N2=F2×2.

That is, by a moment of force of magnitude N=N2−N1>0, the insulator device 1
is always trying to return to its original stable state due to the reaction in the X direction.

In contrast, the conventional balance yoke 2C, 2
In the insulator device 15 using D, as shown in Fig. 5, even if force F such as wind pressure acts, the difference in moment of force due to the action of gravity W1 and W2, that is, N = N2 - N1 = 0 Therefore, it does not receive the reaction of the moment of force due to the action of gravity, and does not try to return to its original resting state in response to the wind pressure force F.

As explained above using the mechanical model,
This insulator device 1 uses the twisting force of the conductor or
Even if wind pressure or the like acts, the insulator device 1 as a whole is difficult to twist. Therefore, the horn mounting bracket 5 that connects the long insulators 3, 3 of the upper and lower insulator chains 1A, 1B of this insulator device 1, and the horn mounting bracket that connects both insulator chains 1A, 1B and both yokes 2A, 2B. 6. Right angle clevis links 8, 8, or parallel clevis 9 connecting this insulator device 1 and tower body 11, right angle clevis link 10, parallel clevis 9, compression clamp 12, etc. on which torsional torque of conductor 13 directly acts, in particular. No excessive force is applied to the material, and deformation or destruction is unlikely to occur.

Effects of the Invention As detailed above, the insulator device of the present invention has the following features:
Compared to conventional insulator devices, the insulator device itself is difficult to twist even when external forces such as twisting torque of the conductor or wind pressure are applied, and the yoke on the conductor side is also difficult to twist, resulting in a stable vertical arrangement of insulator chains. can be maintained. Therefore, it is possible to provide a vertically arranged multiple tension insulator device in which high voltage lines are disposed on a steel tower, which has excellent balance and has a long service life.

[Brief explanation of the drawing]

Figure 1 is a front view showing an embodiment of the invention, Figure 2 is a front view showing an embodiment of the invention.
The figure is a graph showing the results of an experiment comparing the relationship between the twisting torque and the twisting angle of the conductor side yoke between the insulator device of the above embodiment and the conventional insulator device. FIG. 5 is a schematic diagram of the effect of a conventional insulator device on gravity; FIG. 6 is a perspective view showing the conventional insulator device installed; FIG. 7 is a front view of the conventional insulator device. It is a diagram. 1...Insulator device, 1A...Upper insulator chain, 1B...
...Lower insulator chain, 2A...Tower body side yoke, 2B...
Conductor side yoke, 3... Long insulator, 4... Cap fitting, 5, 6... Horn mounting bracket, 7... Arc horn, 8, 10... Right angle clevis link, 9...
...Parallel clevis, 11...Tower body, 12...Compression clamp, 13...Conductor.

Claims (1)

[Claims] 1. A tower body side yoke 2A connected to the tower body 11 at one point by a connecting part P1, and a conductor side yoke 2B connected to the conductor 13 at one point by a connecting part P1.
A device axis H connects a plurality of insulator chains 1A, 1B vertically and in parallel with a predetermined interval between them, and connects the connecting parts P1, P1 on the tower body side and the conductor side.
1, the axis H2 of the upper insulator chain 1A and the lower insulator chain 1B so that the moment of inertia of the lower insulator chain 1B is larger than the moment of inertia of the upper insulator chain 1A.
A vertically arranged multiple tension insulator device characterized in that it is provided above a vertically central position with respect to an axis H3. 2. The distance between the axis H2 of the upper insulator chain 1A and the device axis H1 connecting the connecting parts P1 and P1 on the tower side and the conductor side is 1, and the distance between the axis H3 of the lower insulator chain 1B and the device axis H1 is 2. Then, 1/
2. The longitudinally arranged multiple tension insulator device according to claim 1, wherein the value of 2 is set in the range of 01/2<1, preferably in the range of 0.3<1/2<0.83.