JPH0577126B2 - - Google Patents

Description

[Detailed description of the invention]

Purpose of the Invention (Field of Industrial Application) This invention is designed to quickly discharge abnormally high voltage caused by lightning to the ground when it is applied to a power transmission line, and to prevent ground faults caused by subsequent arcing. This invention relates to a lightning horn insulator device for overhead power transmission lines. (Prior Art) Conventionally, as a device for installing a lightning arrester insulator with a predetermined air discharge gap to a power transmission line, there has been a device disclosed in, for example, Japanese Patent Application Laid-open No. 80589/1989. To explain this device with reference to FIG. 9, an electric wire 12 is supported at the lower end of a hanging insulator 51 suspended below the support arm 1 of the tower body, and a lightning arrester 52 is attached to the side of the hanging insulator 51. I'm wearing it. A lower arc horn 54 that is bent upward is attached to the lower cap metal fitting 53 of the hanging insulator 51. or,
A supporting metal fitting 56 extending laterally and having an upwardly bent tip is fixed to the upper cap metal fitting 55, and a lightning arrester 52 is suspended and fixed to the tip of the metal fitting 56 with a downward slope. There is. Further, an upper arc horn 57 is attached to the lower part of the lightning arrester 52 so as to be inclined downward, and both the upper and lower arc horns 5
4 and 57 face each other with a predetermined air discharge gap G therebetween. (Problems to be Solved by the Invention) However, in the conventional device described above, in order to fix the support metal fitting 56 to the upper cap metal fitting 55, special processing was required for the upper cap metal fitting 55. For this reason, the lightning arrester 5 can be installed using the existing hanging insulator 51.
It was difficult to attach 2 and configure the device.
In addition, since the lightning arrester 52 was installed in an inclined manner with respect to the central axis of the hanging insulator 51, the installation condition was not symmetrical with respect to the central axis of the hanging insulator 51, and the device The condition of the construction was unstable. Therefore, when the electric wire 12 swings due to strong winds, the device swings irregularly, and the hanging insulator 51 is subjected to bending load and torsion due to the swinging of the lightning arrester 52 via the support fitting 56. The force was at work. Therefore, the mechanical strength of the supporting metal fitting 56 and the hanging insulator 51 is reduced, and the supporting metal fitting 56 and the hanging insulator 5
There was also a fear that the air discharge gap G would change due to the deformation of the first part. In view of the above circumstances, this invention is applicable to existing hanging insulator devices and tension insulator devices, stabilizes the installation state, makes the positional relationship between the hanging insulator, tension insulator, and lightning arrester appropriate, The purpose of the present invention is to provide a lightning-proof horn insulator device which can maintain a constant air discharge gap and is suitable not only for power transmission lines of 60 KV class or higher but also for low voltage lines of 20 to 30 KV class. Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention connects the ground side connecting fitting J1 to the support arm 1 of the tower body,
A supporting insulator is connected to the connecting fitting J1, and an electric wire 12 is hooked to the supporting insulator via a connecting fitting J2 on the power supply side.
The lightning arrester 17 is cantilevered laterally through the mounting bracket 16 so as to have a horizontal component, and the lightning arrester 17 is held in a predetermined position in balance with the gravity of the lightning arrester 17. Heavy cone 21
is attached to the connecting fitting J1 via the bracket 20 on the side opposite to the lightning arrester 17, and the connecting fitting J2 on the energizing side has a discharge electrode on the energizing side extending laterally, The discharge electrode attached to the tip of the lightning arrester 17 and the discharge electrode on the energized side,
A configuration in which they face each other with a predetermined air discharge gap G1 is adopted. (Function) By employing the above-mentioned means, the present invention functions as follows. When vibrations of electric wires, wind pressure, etc. act on the lightning horn insulator device, the support insulator swings around the fulcrum Z of the connecting fitting J1 on the ground side, and the lightning arrester 17 swings around the heavy cone 21
It oscillates following the support insulator while maintaining balance. At this time, since the lightning arrester 17 and the heavy cone 21 were cantilevered to the side with a horizontal component on the connecting fitting J1 on the grounding side, the heights of their centers of gravity P1 and P2 were at the height of the fulcrum Z. As a result, when the support insulator is rotated, the force required to rotate the lightning arrester 17 and the heavy cone 21 is small, and the mounting bracket 16,
Unreasonable stress concentration does not occur on the connecting fitting J1 on the grounding side of the brat 20 and the supporting insulator. In addition, since the lightning arrester 17 and the heavy cone 21 are oscillated almost in synchronization with the oscillation of the support insulator, the discharge electrode on the energized side and the lightning arrester 1 are
The aerial discharge gap with the discharge electrode on the 7 side is maintained constant, and the discharge characteristics are stabilized. (Example) Hereinafter, a first example in which the present invention is embodied in a series-suspended lightning horn insulator device will be described in detail with reference to FIGS. 1 to 4. A U-shaped metal fitting 2 is fixed to the support arm 1 with a bolt, and a U-shaped metal fitting 2 is rotatably connected to the U-shaped metal fitting 2. The upper horn mounting bracket 4 is attached to the U clevis 3 in the direction of the track (arrows P and Q in Figure 1) by means of a shaft 5.
A hanging insulator 7, which serves as a support insulator made by connecting a plurality of clevis-type hanging insulators in series, is connected to the metal fitting 4 so as to be rotatable relative to each other in the track direction. It is suspended. In this embodiment, the U-shaped fitting 2, the U clevis 3, and the upper horn mounting fitting 4 connect the connecting fitting J1 on the grounding side.
It consists of A parallel clevis 9 is connected to the lower part of the hanging insulator 7 by a shaft 8 so as to be rotatable in the track direction, and a lower horn mounting bracket 10 is connected to the lower end of the clevis 9 by a shaft 11 so as to be rotatable relative to the track direction. connected to
A suspension clamp 13 that supports the electric wire 12 is connected to the metal fitting 10 by a shaft 14 so as to be rotatable in the line direction. In this embodiment, the parallel clevis 9, the lower horn attachment fitting 10, and the suspension clamp 13 constitute a connection fitting J2 on the power supply side. As shown in FIG. 3, a mounting bracket 16 is fixed to the left arm portion 4a of the upper horn mounting bracket 4 with bolts 15. As shown in FIG. This mounting bracket 16 is composed of a triangular plate part 16a fixed to the arm part 4a and a square plate part 16b welded and fixed at right angles to the triangular plate part 16a. A lightning arrester 17 is horizontally fixed in a cantilever manner by bolts 18 to the front surface of the square plate portion 16b. Furthermore, a bracket 20 is cantilevered and fixed to the right arm portion 4b of the upper horn mounting bracket 4 by bolts 19. As shown in FIG. 3, the tip of the bracket 20 has a plurality of blocks 21.
A heavy cone 21 constituted by a is fixed with bolts 22. In a stationary state, the centers of gravity P1 and P2 of the lightning arrester 17 and the heavy cone 21 are as shown in FIG.
is made to be approximately the same as the height position of the fulcrum Z of the U-shaped fitting 2 and the U clevis 3.
In addition, a perpendicular line Y passing through the fulcrum Z so that the lightning arrester 17 and the heavy cone 21 are statically balanced with respect to the fulcrum Z
- Distance L1 from Y to center of gravity P1 of lightning arrester 17
, the distance L2 to the heavy cone 21, and the lightning arrester 1
7. The weights W1 and W2 of the heavy pyramid 21 are set respectively. An arc horn 24 as a discharge electrode is fixed downward to the electrode 23 at the tip of the lightning arrester 17, and the arc horn 24 is fixed to the left arm portion 10a of the lower horn mounting bracket 10 with a bolt 25. It faces the arc horn 26 as a discharge electrode on the power supply side with a predetermined aerial discharge gap G1. Further, as shown in FIG. 2, a discharge portion 24a curved in an arc shape in the direction perpendicular to the line (arrows R and S in FIG. 2) is fixed to the tip of the arc horn 24, and is suspended. Insulator 7 and lightning arrester 17
When relative movement occurs in the direction perpendicular to the line, the air discharge gap G1 is kept constant. As shown in FIG. 1, the tip of the arc horn 26 extends outward from the perpendicular line H passing through the discharge portion 24a, and is raised in an arc shape from the horizontal plane, and is connected to the hanging insulator 7 and the lightning arrester 17. When a relative movement occurs in the line direction, the air discharge gap G is maintained substantially constant. Furthermore, the height of the tip of the arc horn 26 is higher than the height of the shaft 8 that connects the hanging insulator 7 and the parallel clevis 9, so that the electric field near the shaft 8 on the energized side of the hanging insulator 7 is This prevents the hanging insulator 7 from becoming susceptible to creepage flash due to disturbance. The above-mentioned air discharge gap G1 is defined as a distance in which no discharge occurs between the arc horns 24 and 26 due to opening/closing surges, and a distance in which the insulation strength of the air discharge gap G1 does not exceed the insulation strength of the hanging insulator 7. The distances and allowances for each are set between the two. Also, the arm portion 4 of the upper horn mounting bracket 4
a, 4b, a pair of arc horns 27, 28 extending downwardly are attached to the bolts 15, 19.
is fixed. One arc horn 27 faces the arc horn 26 with a predetermined clearance C, and the other arc horn 28
is the right arm part 10 of the lower horn mounting bracket 10
b and a predetermined aerial discharge interval G2 between the arc horn 30 fixed with a bolt 29 and extending upward.
They are facing each other with Further, on the left and right sides of the lightning arrester 17, the same lightning arrester 1 is provided.
Arcing rings 31 and 32 surround 7.
is provided so that when the lightning arrester 17 causes abnormal discharge due to a lightning surge, the arc jet is quickly transferred from the lightning arrester 17. Here, in order to operate this device normally, the insulation strength of the air discharge gap G1 is configured to have a margin greater than a certain value with respect to the insulation strength of the hanging insulator 7. Further, the air discharge gaps G1, G2, the clearance C, and the arcing ring 31,
Between the 32 air discharge gaps G3, the following equation is made to hold so that discharge is always performed preferentially in the air discharge gap G1. G1<G3<C~G2 Next, the operation of the lightning horn insulator device configured as described above will be explained. Generally, a suspension clamp 1 is attached to the suspension insulator 7 that is suspended from the support arm 1 of the tower body and supports the electric wire 12.
A large load of the electric wire 12 (6
Approximately 0.5 to 1 t) acts in the 10,000 V class. Therefore,
In the stationary state of this device, the hanging insulators 7, U
The clevis 3, the upper horn fitting 4, the parallel clevis 9, the lower horn fitting 10, and the suspension clamp 13 are suspended in series on a perpendicular line YY passing through the fulcrum Z. Also, the lightning insulator 17 is a heavy cone 21
is balanced and supported in a horizontal position. By the way, when the load balance of the electric wire 12 changes due to snow accumulation, etc., and the electric wire 12 swings in the direction of the line Q arrow in FIG. Lower insulator 7
swings in the same direction around the fulcrum Z. As the hanging insulator 7 swings, the lightning arrester 17 and the heavy cone 21 are rotated together with the upper horn mounting bracket 4 in the same direction about the fulcrum Z with a slight delay. A difference of several degrees occurs in the inclination angle of , and the arc horn 26 moves in a direction away from the arc horn 24 . However, since the tip of the arc horn 26 extends on the opposite side of the hanging insulator 7 with respect to the perpendicular line H passing through the discharge portion 24a and is raised from the horizontal plane, the tip of the arc horn 26 , the air discharge gap G1 widens only slightly, and the insulation strength of the gap G1 does not exceed the insulation strength of the hanging insulator 7. Therefore, even if an abnormally high voltage due to a lightning strike flows through the electric wire 12,
This high voltage is discharged in the air discharge gap G1 and flows to the support arm 1 of the tower body via a non-linear resistance element built into the lightning arrester 17. Further, the subsequent arc generated thereafter is blocked by the above-mentioned aerial discharge gap G1 and the non-linear resistance element. On the other hand, the moment of force due to the weight W1 of the lightning arrester 17 acting on the fulcrum Z is canceled by the moment of force due to the weight W2 of the heavy pyramid 21 acting on the fulcrum Z. Therefore, the hanging insulator 7 swings as if the lightning arrester 17 and the heavy cone 21 are not attached, and the suspension insulator 17, the heavy cone 21, the mounting bracket 16, the bracket 20, and the upper horn Stress concentration that causes twisting does not occur in the mounting bracket 4, furthermore, in the hanging insulator 7, etc. As a result, the mechanical strength of the device is maintained. Furthermore, when the electric wire 12 swings in a direction perpendicular to the line due to strong winds, etc., the hanging insulator 7 swings in the same direction around the fulcrum Z, and the lightning arrester 17 and the heavy cone 21 also follow the hanging insulator 7 in the same direction. swing in the direction. At this time, the centers of gravity P1 and P2 of the lightning arrester 17 and the heavy cone 21
Since the height of the support point Z is almost the same as the height position of the fulcrum Z, the force for rotating the lightning arrester 17 and the heavy cone 21 becomes small, and therefore, as the hanging insulator 7 rotates, the lightning arrester 17 and the heavy pyramid 21 are rotated substantially synchronously, and the aerial discharge gap G1 can be maintained substantially constant. In addition, the upper horn mounting bracket 4 and U clevis 3,
Furthermore, there is no stress concentration due to torsion in the hanging insulator 7, etc., and the lightning arrester 17 and the heavy cone 21 swing as if they were not attached, so the mechanical strength of the device is maintained. Ru. Further, as described above, the aerial discharge gap G1 is maintained almost constant, but even if the facing positions of the arc horn 26 and the arc horn 24 are slightly shifted due to some reason, the arc-shaped discharge portion 24a of the arc horn 24 Since the discharge characteristics are corrected by , the discharge characteristics are stabilized, and discharge is reliably performed in the aerial discharge gap G1 during a lightning strike, thereby improving the protection performance. On the other hand, if the insulation strength of the hanging insulator 7 is reduced due to abnormal contamination or other causes, and an arc is generated on the creeping surface, the arc will be caused by the air discharge gap G2 between the arc horns 30 and 28. This prevents the hanging insulator 7 from burning out and prevents arc propagation to the tower body. The device of this embodiment has a lightning arrester 17 in place of the existing hanging insulator 7 attached to the support arm 1 of the tower body.
The device is constructed by attaching the mounting bracket 16 and bracket 20 of the heavy cone 21 as an adapter. , a lightning arrester 17 and a heavy cone 21 can also be attached. Therefore, this device has a wide range of applications and is very practical. Further, since the arc horn 26 is fixed to the horn mounting bracket 10 with the bolt 25, there is no need to provide a separate mounting bracket or the like at the lower end of the hanging insulator 7, and therefore, an increase in the length of the insulator can be prevented. Also from this point of view, it is easy to apply to existing insulator devices. Now, in the embodiment of the present invention, since the lightning arrester 17 is supported horizontally on the upper horn mounting bracket 4, the air discharge gap G1 between the arc horn 24 on the lightning arrester 17 side and the arc horn 26 on the energized side can be easily formed. can be secured. In particular, the hanging insulator 7 of the lightning insulator device used for 20 to 30 KV power transmission lines does not require much insulation strength, so a short insulator length is used. This is very convenient for securing. Also, lightning insulator 17
In the method of hanging vertically, in order to secure the required clearance between the suspension insulator 7 and the lightning arrester 17,
Although it is difficult to bring the center of gravity of the lightning arrester 17 closer to the hanging insulator 7 side, in this embodiment, the center of gravity W1 of the lightning arrester 17 can be brought closer to the shaft 5 side regardless of this required clearance. The weight of the heavy cone 21 is also reduced, and the insulator device can be made smaller and lighter. In addition, in the embodiment of the present invention, the lightning arrester 17 and the heavy cone 21
By assuming that the centers of gravity P1 and P2 are almost the same as the fulcrum Z, the force when the hanging insulator 7 swings in the direction perpendicular to the track is reduced, so that there is no space between the upper horn mounting bracket 4 and the hanging insulator 7. There is no need to interpose a parallel clevis link that allows relative rotation in the direction perpendicular to the line, and the length of the insulator device in the vertical direction can be reduced accordingly, and the number of parts can also be reduced. Furthermore, in the embodiment of the present invention, since the lightning arrester 17 is supported horizontally, the water draining effect of the insulating shade 17a formed by rubber molding on the surface of the lightning arrester 17 is improved, and the contamination withstand voltage is improved. Furthermore, in the embodiment of the present invention, since the lightning arrester 17 and the heavy cone 21 are balanced with respect to the fulcrum Z,
Even if the load on the hanging insulator 7 changes, the lightning arrester 17,
Also, the heavy cone 21 is hardly affected, and the insulator device is stabilized from this point as well. Next, a second embodiment of the present invention will be described based on FIG. This second embodiment is embodied in a double-suspended lightning horn insulator device. In this embodiment, a series of hanging insulators 7 are connected in parallel to an upper connecting yoke 33 and a lower connecting yoke 34, which also serve as horn mounting brackets, and a lightning arrester 17 and a heavy cone 21 are connected to the upper connecting yoke 33 with respect to a fulcrum Z. It is installed in a balanced manner. This second embodiment also has substantially the same functions and effects as the insulator device of the first embodiment described above. In addition, in this second embodiment, members having the same functions as those in the first embodiment are given the same reference numerals, and explanations thereof will be omitted. Next, a third embodiment of the present invention will be described based on FIGS. 6 and 7. This third embodiment is a series of tension-resistant lightning horn insulator devices in which a tension-resistant insulator 43 serving as a support insulator is hooked horizontally to a support arm 1. To explain this, the connecting fitting J1 on the grounding side is connected to a U clevis 35 that is horizontally rotatably connected to the support arm 1, a U clevis 3 that is connected to the U clevis 35, and a U clevis 3 that is connected to the U clevis 3. and a horn mounting bracket 36. Upper arm portion 36 of the horn mounting bracket 36
A mounting plate 37 is fixed to a by bolts 38,
A mounting bracket 16 for supporting the lightning arrester 17 in the horizontal direction is supported on the mounting plate 37. or,
A bracket 39 for supporting the heavy cone 21 is fixed to the opposite side of the mounting plate 37, and a lightning arrester 1 is attached to the tips of the mounting bracket 16 and the bracket 39.
7, and the heavy pyramid 21 are mounted so as to be balanced about the fulcrum Z. In addition, the connection fitting J2 on the power supply side includes a parallel clevis 9, a horn mounting fitting 40, and a link 4.
1, and a wire clamp 42. In this third embodiment, members having the same functions as those in the first embodiment are designated by the same reference numerals and explanations thereof will be omitted. This third embodiment also has substantially the same functions and effects as the first embodiment described above. Furthermore, a fourth embodiment of the present invention will be described based on FIG. 8. This embodiment is a concrete example of a tension insulator device with two parallel series, in which a pair of tension insulators 45 are connected by connecting yokes 33 and 34, and a lightning arrester 1
7 and the heavy cone 21 are connected to the connection yoke 33 on the grounding side.
In contrast, it is mounted by a mounting fitting 46 and a bracket 47 so as to be balanced with respect to the fulcrum Z.
Further, the arc horn 2 is connected to the connection yoke 34 on the power supply side.
An arc horn 26 facing 4 is supported. This fourth embodiment also has substantially the same functions and effects as the first embodiment described above. In this fourth embodiment, members having the same functions as those in the third embodiment are designated by the same reference numerals and explanations thereof will be omitted. Moreover, this invention can also be implemented as follows. The mounting position of the mounting bracket 16 and the bracket 20 can be changed with respect to the horn mounting brackets 4 and 10.
Forming more than one hole. Effects of the Invention As detailed above, this invention can be easily applied to existing support insulators, which simplifies construction work, and also prevents abnormal shaking due to vibration of electric wires, resulting in stable Maintains the erection condition and prevents unreasonable stress concentration on the supporting insulators and their connecting fittings.
The reliability and durability of the device can be improved by keeping the air discharge gap constant. Furthermore, it can be easily applied to 20 to 30 KV class railway lines, and the device can be made smaller and lighter, making it more environmentally friendly.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a first embodiment embodying the present invention, Fig. 2 is a left side view of Fig. 1, and Fig. 3 is an enlarged exploded perspective view showing the mounting structure of a lightning arrester and a heavy cone. , FIG. 4 is a partially enlarged front view showing the balanced state of the lightning arrester and the heavy cone, FIG. 5 is a front view showing the second embodiment of the invention, and FIG. 6 is a front view showing the third embodiment of the invention. 7 is an enlarged plan view of FIG. 6, FIG. 8 is a plan view showing a fourth embodiment of the present invention, and FIG. 9 is a front view showing a conventional example. 1...Support arm, 2...Grounding side connection fitting J
1. U-shaped metal fitting that constitutes 1, 3...U clevis that forms connecting metal fitting J1, 4... Upper horn mounting metal fitting that constitutes connecting metal fitting J1, 5, 6... Shaft, 7... Suspension as support insulator. Insulator, 9...parallel clevis constituting the connection fitting J2 on the power supply side, 10...lower horn mounting bracket forming the connection fitting J2 on the power supply side,
12... Electric wire, 13... Suspension clamp constituting the connection fitting J2 on the power-supplying side, 16, 46... Mounting bracket, 17... Lightning arrester, 20, 39, 47... Bracket, 21... Heavy cone, 24... Arc horn as a discharge electrode, 26... Arc horn as a discharge electrode on the charging side, G1... Arc horn 2
Aerial discharge gap between 4 and 26, P1, P2... center of gravity of lightning arrester 17 and heavy cone 21, Z... fulcrum, W
1, W2... Weight of the lightning arrester 17 and the heavy cone 21, J1... Connection fitting on the grounding side, J2... Connection fitting on the charging side.

Claims (1)

[Claims] 1. Connecting fitting J1 on the grounding side to the support arm 1 of the tower body.
A supporting insulator is connected to the connecting fitting J1, and a connecting fitting J on the power supply side is connected to the supporting insulator.
2, and the lightning arrester 17 is cantilevered to the side through the mounting brackets 16 and 46 to the connecting bracket J1 on the ground side so as to have a horizontal component. A heavy cone 21 for holding the lightning arrester 17 in a predetermined position in balance with the gravity of the insulator 17 is attached to the opposite side of the lightning arrester 17 with respect to the connecting fitting J1 via the brackets 20, 39, 47. The connecting fitting J2 on the energizing side has a energizing side discharge electrode extending laterally,
The discharge electrode attached to the tip of the lightning arrester 17 and the discharge electrode on the energized side are connected to each other at a predetermined air discharge gap G.
1. A lightning-resistant horn insulator device, characterized in that 1 is opposed to the other. 2. The U-shaped bracket 2, U clevis 3, and upper horn mounting bracket 4, which constitute the ground side connecting bracket J1, are connected to the support arm 1 so as to be able to rotate in sequence, and the upper horn mounting bracket 4 is equipped with a support insulator as a support insulator. A hanging insulator 7 is connected and suspended, and the hanging insulator 7 has a parallel clevis 9 configuring the connection fitting J2 on the power supply side, a lower horn mounting fitting 10, and a suspension clamp 1 for the electric wire 12.
3 are connected so as to be sequentially movable, and the lightning arrester 17 is connected to the arm portion 4a of the upper horn mounting bracket 4.
It is horizontally supported in a cantilever manner via the mounting brackets 16 and 46, and a heavy cone 21 is supported on the arm portion 4b of the upper horn mounting bracket 4 via brackets 20, 39, and 47, and the arm of the lower horn mounting bracket 10 is The lightning horn insulator device according to claim 1, wherein an arc horn 26 as a discharge electrode on the energizing side is attached to the portion 10a. 3. The lightning horn insulator device according to claim 1, wherein the weight of the heavy cone 21 is adjustable. 4. The lightning horn insulator according to claim 2, wherein the heights of the centers of gravity P1 and P2 of the lightning arrester 17 and the heavy cone 21 are approximately the same as the height of the fulcrum Z of the U-shaped fitting 2 and the U clevis 3. Device. 5 The height of the tip of the arc horn 26 is the height of the hanging insulator 7
The lightning horn insulator device according to claim 2, wherein the lightning horn insulator device is located at a position higher than the height of the shaft 8 connecting the parallel clevis 9 and the shaft 8.