JPH0636333B2 - Lightning-proof horn insulator device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) When an abnormally high voltage caused by a lightning strike is applied to a transmission line, the present invention promptly grounds it, and by a follow-up arc generated thereafter. The present invention relates to a lightning protection horn insulator device for an overhead power transmission line for preventing fusing of the power transmission line, in particular, using a tension resistant insulator.

(Prior Art) Conventionally, as a device for mounting a lightning arrestor on a power transmission line with a predetermined air discharge gap, for example, Japanese Utility Model Publication No. 47-36.
There was a device disclosed in Japanese Patent No.

In this device, as shown in FIG. 12, a tension-resistant insulator 3 holding an electric wire 2 is fixed to a tower body 33, and a valve resistance element ( A lightning protection insulator 5 enclosing a non-linear resistance element is integrally formed, and an electrode 42 is also provided at the tip of the tension-resistant insulator 3.
And the electrode 43 provided at the tip of the lightning protection insulator 5 are opposed to each other with an air discharge gap G therebetween.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional device, the base end of the tension-resistant insulator 3 and the base end of the support fitting 41 are integrally formed, so that the existing tension-resistant insulator is used. It was difficult to mount the lightning protection insulator 5 using 3 and construct the device. In addition, stress concentration occurs in the tension-resistant insulator 3 and the support fitting 41 due to the bending moment due to the weight of the lightning protection insulator 5. Further, since the lightning protection insulator 5 is attached while being displaced with respect to the tension-type insulator 3, the attachment state is not symmetrical with respect to the central axis of the tension-type insulator 3 and the installation of the device is prevented. The condition was unstable. For this reason, when the electric wire 2 is shaken by a strong wind, the device swings irregularly and a bending load or a twisting force acts on the tension-resistant insulator 3, the support metal fitting 41, and the lightning arrestor 5. . Therefore, the mechanical strength of the device is reduced, and the air discharge gap G may be changed due to the deformation of the support fitting 41 and the tension-type insulator 3.

In view of the above circumstances, the present invention can be applied to an existing tension-resistant insulator and, in a stable installation state, appropriately maintains the positional relationship between the tension-resistant insulator and the lightning protection insulator and maintains the air discharge gap and the retention. Then, it aims at providing the lightning protection horn insulator apparatus which does not impair the function of the lightning protection insulator.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention connects a retaining metal fitting to the support arm 1 of the tower body, and the retaining metal fitting connects to the tower body side connecting metal fitting. The tension insulator 3 is connected via the wire, and the wire 2 is installed on the tension insulator 3 via the wire side connecting metal fitting.
The lightning protection insulator 5 is cantilevered and fixed to the tower side connecting metal fitting so as to be located above the tension insulator 3 via the mounting metal fitting 4A, and the tower body side connecting metal fitting is also mounted on the tower side connecting metal fitting via the mounting metal fitting 4B. A weight 6 for suspending the lightning protection insulator 5 in a stable state in balance with the weight of the insulator 5 is hung, and the wire-side connecting metal fitting supports the discharge electrode on the power-supply side in an upward direction. A structure is adopted in which the discharge electrode attached to the tip of the insulator 5 and the discharge electrode on the charging side face each other with a predetermined air discharge gap G2.

(Operation) This invention operates as follows by adopting the above means.

The device can be easily constructed by attaching the lightning protection insulator and the weight to the existing tower-side connecting fitting of the tension-resistant insulator through the mounting fitting.

Further, when the shake of the electric wire or the wind pressure acts on the device, the device itself swings around the latch. At this time, the lightning protection insulator swings while following the tension insulator while maintaining balance with the weight, so that unreasonable stress concentration does not occur in the mounting metal fitting, the tower side coupling metal fitting, and the tension insulator. As a result, the air discharge gap between the discharge electrode on the charging side and the discharge electrode at the tip of the lightning insulator is kept constant.

When an abnormally high voltage caused by a lightning strike is applied to the wire, the current at this time is discharged in the air discharge gap and flows to the support arm of the tower body via the non-linear resistance element built into the lightning arrestor. Be done. Further, the subsequent arc generated thereafter is interrupted by the air discharge gap and the non-linear resistance element.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS.

The lightning protection horn insulator device of this embodiment is roughly shown in that an existing tension insulator 3 that is hooked on the tip of a support arm 1 of a tower body and that supports an electric wire 2 and a mounting bracket 4A above it. It is composed of a lightning protection insulator 5 attached via the above, and a weight 6 attached below the tension insulator 3 via an attachment metal fitting 4B.

Explaining each part, a U clevis 7 as a hooking metal is fixed to the support arm 1 with bolts.
Similarly, a U-clevis 8 serving as a latch is rotatably connected to. The U clevis 8 is rotatably connected. The U-clevis 8 is connected to a tower side horn mounting bracket 9 as a tower side connecting bracket by a shaft 10 so as to be vertically rotatable relative to each other, and one end of the bracket 9 is vertically rotated by a shaft 11. The tensile insulator 3 is connected via the ball clevis 12 which is connected as possible.

A socket clevis 13 is provided at the end of the tension insulator 3 on the side where voltage is applied.
A wire-side horn mounting bracket 14 as a wire-side connecting bracket is connected by a shaft 15 so as to be relatively rotatable in the vertical direction. A parallel clevis link 17 is connected to one end of the wire-side horn mounting bracket 14 by a shaft 16 so as to be capable of relative rotation in the vertical direction, and the clevis link 17 is capable of relative rotation in the vertical direction by a shaft 18. A connection link 20 fixed to an electric wire clamp 19 that supports 2 is connected. A jumper wire 21 is connected to the lower portion of the wire clamp 19.

As shown in FIG. 3, the mounting metal fitting 4A of the lightning protection insulator 5 is composed of a plate member 4a and a pair of arm pieces 4c, 4c having a gap 4b fixed to the plate member 4a. Bolt insertion holes 4d are provided near the lower ends of both arm pieces 4c, 4c.
An arc-shaped long hole 4e is provided at the upper end of cno. Then, after the existing arc horn is detached from the tower side horn mounting bracket 9, the mounting bracket 4A fits the arm pieces 4c, 4c to the upper part of the horn mounting bracket 9 and the bolts 22, 22 are attached. It is fixed by. The mounting bracket 4A has its mounting angle by loosening the bolts 22 and 22 and tilting in the track direction (arrows R and S) around the bolt 23 inserted into the hole 4d as shown in FIG. θ is adjustable.

Further, as shown in FIG. 5, the mounting member 4B of the weight 6 is composed of a gap member 4f and a pair of arm pieces 4c, 4c which sandwich the gap member 4f to form a gap 4b.
As for the mounting bracket 4B, the existing arc horn is detached similarly to the mounting bracket 4A, and then the arm pieces 4c, 4c are fitted to the lower portion of the tower side horn mounting bracket 9 to fix the bolt 2
It is fixed by 3,23.

As shown in FIGS. 1 and 4, the plate member 4 of the mounting bracket 4A.
A lightning protection insulator 5 is vertically fixed to the plate member a by bolts 24 with respect to the plate member 4a, and extends obliquely upward. On the other hand, the weight 6 is attached to the tip of the mounting bracket 4B by the bolt 2
It is fixed at 5. As shown in FIG. 5, the weight 6 is composed of a plurality of blocks 6a, and the weight 4
It is fixed to the tips of the B arm pieces 4c, 4c with bolts 25. The weight of the weight 6 can be adjusted by changing the number of the blocks 6a. The lightning protection insulator 5 and the weight 6 are, as shown in FIGS.
In the stationary state of the apparatus, they are arranged vertically corresponding to each other about the axis 10 and are set so as to be statically balanced and held in a stable state.

On both sides of both arm pieces 4c, 4c of the mounting bracket 4A,
As shown in FIG. 2, a pair of arc horns 26, 26, which are inclined upward (inclination angle of 45 degrees in this embodiment), are integrated with the mounting bracket 4A through the mounting piece 26a so as to be integrated with the bolt 2.
It is fixed at 2,22. Wire side horn mounting bracket 14
An arc horn 27 serving as a discharge electrode on the charging side extending obliquely upward is fixed by bolts 28, 28, and faces the arc horns 26, 26 with a predetermined air discharge gap G1. An arc horn 29 as a discharge electrode is fixed to the tip of the lightning protection insulator 5. The arc horn 29, as shown in FIG. 6, has a bearing portion 30 at the tip of a support cylinder 30 attached to the tip of the lightning protection insulator 5.
A pair of holding pieces 31, 31 rotatably attached to a by a shaft (not shown) so as to be rotatable in the vertical direction (arrows J, K) is fixed by a bolt 32. The arc horn 29
Can be slid with respect to the holding pieces 31 and 31 by loosening the bolt 32, and the protruding length thereof can be adjusted. The arc horn 29 adjusts the vertical angle and the protruding length, and opposes the arc horn 27 with a predetermined air discharge gap G2. The arc horn 27
Is also used as a discharge electrode on the charging side for the arc horns 26 and 29. Here, in order to operate this device normally, the insulation strength of the air discharge gap G2 is set to a certain value or more with respect to the insulation strength of the lightning arrestor 5.

In this embodiment, a lightning protection insulator 5 having a weight of 34.0 kg and a weight 6 having a weight of 60.0 kg are used. Where the seventh,
As shown in FIG. 8, it corresponds to the distance between the center of gravity P1 of the lightning protection insulator 5 and the center of gravity P2 of the weight 6 and the shaft 10 which is the center of rotation of the tower side horn mounting bracket 9 and both mounting brackets 4A, 4B. The virtual lines are L1 and L2, respectively. Then, with the imaginary line L1 as the overhang length, as shown in FIG. 8, the weight W1 of the lightning arrester 5 acting at a right angle to the imaginary line L1 and in the line orthogonal direction is calculated. Rather than the moment of the force due to the force w1,
The moment of the force due to the component force w2 of the gravity W2 of the weight 6 acting in the direction orthogonal to the virtual line L2 and acting in the line orthogonal direction is made larger.

Next, the operation of the lightning protection horn insulator device configured as described above will be described.

Now, the tension insulator 3 hooked on the support arm 1 is affected by the weight of the electric wire 3, and its central axis forms a catenary angle with respect to the horizontal plane. Therefore, as shown in FIG. 9, in order to install a plurality of this device in the vertical direction of the tower body 33,
The mounting bracket 4A is attached to the horn mounting bracket 9 so that the lightning protection insulator 5 of the lower layer device and the jumper wire 21 of the upper layer are arranged with a predetermined clearance C in response to changes in the catenary angle of the tension insulator 3. Adjust the angle. At this time, the tension insulator 3 supporting the electric wire 2 is passed through the electric wire clamp 19 in the line direction as shown in FIG.
Tension due to its own weight (Approx. 1t-4 in 60,000V class)
t) is working. Therefore, in the stationary state of this device, the U clevis 7, 8, the tower side horn mounting member 9,
Further, the tension T acts on the ball clevis 12. Further, in order to mount the weight 6, the tower side horn mounting member 9 has its upper and lower end portions vertically upright as shown in FIGS. 4 and 7, and the lightning protection insulator 5 is mounted via the mounting member 4A. , The horn mounting member 9 is stably held in an inclined state at a predetermined angle α with respect to the horizontal plane.

By the way, when the electric wire 2 is swung in the direction orthogonal to the line due to wind pressure or the like, the tension insulator 3 swings in the same direction around the fulcrum Z which is the connection point of the U clevis 7, 8, and the lightning protection insulator 5 and The weight 6 follows the tension insulator 3 and is swung in the same direction. At this time, the lightning protection insulator 5 and the weight 6 are, for example,
As shown in the figure, it rotates about the acting axis of the tension T passing through the fulcrum Z. However, since the moment of force of the component force w2 acting as the length of the imaginary line L2 on the side is larger than the moment of the force of component force w1 acting on the imaginary line L1 as the length of the horn mounting metal fitting. 9 always tries to return to a stationary state by rotating in the Y direction due to the difference between the moments of both the forces. Therefore, the lightning protection insulator 5 and the weight 6 are respectively held in series in the vertical direction, and the tower side horn mounting bracket 9, the U clevis 8, the ball clevis 12, and
There is no twist stress concentration in the tension insulator 3 and the like, and the tension insulator 3 swings as if the lightning protection insulator 5 and the weight 6 are not attached, so the mechanical strength of the device is improved. The strength is maintained.

Further, since the tension insulator 3 and the lightning protection insulator 5 are oscillated in synchronization, the air discharge gaps G1 and G2 are kept substantially constant,
The discharge characteristics are stable and the protection performance of the device is improved.

By the way, when an abnormally high voltage due to a lightning strike is applied to the electric wire 2, the current at this time is discharged in the air discharge gap G2 that is appropriately maintained between the arc horn 27 and the arc horn 29, and the lightning arrester is provided. It flows into the support arm 1 of the tower body through the non-linear resistance element built in 5. Further, the subsequent arc generated thereafter is interrupted by the air discharge gap G2 and the non-linear resistance element. On the other hand, when the insulation strength is lowered due to abnormal contamination or the like and an arc is generated on the bath surface of the insulator 3, the arc insulator 26 is extinguished in the air discharge gap G1 and the insulator is The burnout of No. 3 is prevented, and the arc is prevented from propagating to the tower body.

In addition, in the device of this embodiment, the lightning protection insulator 5 and the weight 6 are provided in addition to the existing tension insulator 3 mounted on the support arm 1 of the tower body.
The apparatus is configured by attaching the mounting brackets 4A and 4B as an adapter, but the both mounting brackets 4A and 4B are preliminarily attached to the newly installed tension insulator 3, and the lightning protection insulator 5 and The weight 6 can be attached to configure the device.
Therefore, this device has a wide range of application and is very practical.

The present invention can also be implemented as follows.

(1) As shown in FIG. 10, the tower side horn mounting bracket 9
Provide both sides with a plurality of holes 9a.

In this another example, the mounting metal fittings 4A for the lightning protection insulator 5 and the weight 6 are
Since the mounting position can be adjusted when the 4B is attached separately, the tension insulator 3 and the lightning arrestor 5, or the tension insulator 3
The clearance between the weight and the weight 6 can be adjusted.

(2) As shown in FIG. 11, the mounting metal fittings for the lightning protection insulator 5 and the weight 6 are formed on the integral mounting metal fitting 4.

In another example, since the mounting bracket 4 can be mounted to the tower side horn mounting bracket 9 at once, the work becomes easy.

As described in detail above, since the present invention can be easily applied to an existing suspension insulator, the construction can be simplified, and the vibration of the electric wire does not cause abnormal swinging, so that the suspension can be performed easily. It is possible to improve the durability of the device without unreasonable stress concentration on the lower insulator and its mounting bracket, to maintain a stable erected state, to maintain a constant air discharge gap, and to improve reliability. Produce an effect.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment embodying the present invention,
2 is an enlarged cross-sectional view taken along the line XX of FIG. 1, FIG. 3 is a perspective view of a lightning arrestor mounting bracket, FIG. 4 is a partially enlarged front view near the lightning insulator mounting bracket, and FIG. FIG. 6 is a perspective view of the mounting bracket and the weight, FIG. 6 is a partially enlarged front view of the tip of the lightning arrester, and FIG.
The figure is a front explanatory view showing the balanced state of the lightning protection insulator and the weight, 8th
Similarly, FIG. 9 is a side explanatory view showing the action of gravity in the inclined state of the lightning protection insulator and the weight, and FIG. 9 is an explanatory view showing the installed state of the tower body,
FIG. 10 is a front view showing another example of the tower side horn mounting bracket,
FIG. 11 is a front view showing another example of a metal fitting for a lightning protection insulator and a weight, and FIG. 12 is a front view showing a conventional example. 1 ... Support arm, 2 ... Electric wire, 3 ... Tensile insulator, 4A (4
B) ... Lightning protection insulator (weight) mounting bracket, 5 ... Lightning protection insulator, 6 ...
Weights, 7, 8 ... U clevis, 9 (14) ... Tower side (electric wire side) horn mounting bracket, 19 ... Electric wire clamp, 26, 2
7, 29 ... Arc horn, C ... Clearance, G1, G
2 ... Air discharge gap, P1, P2 ... Center of gravity, Z ... Support point.

Claims (7)

[Claims] 1. A hook metal is connected to a support arm (1) of a tower body, and a tension insulator (3) is connected to the hook metal through a tower-side connecting metal fitting, and at the same time, The electric wire (2) is installed on the insulator (3) via the electric wire side connecting metal fitting, and the tower side connecting metal fitting is positioned above the tensile strength insulator (3) via the mounting metal fitting (4A). The lightning protection insulator (5) is fixed in a cantilever manner, and the lightning protection insulator (5) is held in a stable state in balance with the weight of the lightning protection insulator (5) through the mounting bracket (4B) on the tower side connecting fitting. A weight (6) for suspending is suspended, and the electric wire side connecting metal fitting supports the discharge electrode on the charging side upward, and the lightning protection insulator (5).
A lightning protection horn insulator device, characterized in that the discharge electrode attached to the front end portion of the above and the discharge electrode on the charging side face each other with a predetermined air discharge gap (G2). 2. The moment of force of the weight (6) centering on the tower side connecting fitting is larger than the moment of force of the lightning arrester (5) also centering on the tower side connecting fitting. Item 6. A lightning protection horn insulator device according to item. 3. The lightning protection horn insulator device according to claim 1, wherein the lightning protection insulator (5) and the weight (6) mounting metal fittings (4A, 4B) are provided separately or integrally. . 4. The lightning protection horn insulator device according to claim 1, wherein the weight (6) has an adjustable weight. 5. The connecting fittings on the tower side are mounting fittings (4A, 4A).
The lightning protection horn insulator device according to claim 1, wherein a plurality of holes for adjusting the mounting position of B) are provided. 6. The lightning protection horn insulator device according to claim 1, wherein the mounting metal fitting (4A) of the lightning protection insulator (5) is adjustable in mounting angle with respect to the tower side connecting metal fitting. 7. The discharge electrode attached to the tip of the lightning arrester (5) has an adjustable protruding length from the tip of the lightning arrestor (5), and is attached to the tip of the lightning insulator (5). The lightning protection horn insulator device according to claim 1, wherein the lightning protection horn insulator device is vertically rotatable.