JPS62295312A - Lightning-proof insulator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Purpose of the Invention (Field of Industrial Application) The present invention relates to a lightning insulator device used for power transmission lines.

(Prior Art) As a conventional vertical insulator device for power transmission lines, there is one shown in FIG. Two suspended insulator chains 8 and 9 are suspended from the support arm 1 of the tower body via an upper connecting yoke 5, and a lower connecting yoke 11 and a connecting A power transmission line 15 is installed using the metal fittings 14, and four arc horns 5 are installed on the upper and lower connecting yokes 5.11.
0 are installed symmetrically, and abnormal current caused by a lightning strike is discharged from the power transmission line 15 through the connecting fitting 14 and the lower connecting yoke 11, from the lower arc horn 50 to the upper arc horn 50, and the suspension insulator chain 8.9 I was trying to protect it.

(Problems to be Solved by the Invention) However, in the conventional suspension insulator device for power transmission lines, in order to quickly ground the abnormal current caused by lightning and cut off the subsequent current, the discharge in the gap between the upper and lower arcing horns 50 is When a lightning arrester configured to discharge at a voltage lower than the current voltage is separately attached to the support arm 1, and a discharge electrode is attached to the lightning arrester and the lower connecting yoke 11, the power transmission line 15
If the insulator is shaken by wind pressure, etc., the discharge gap length of the re-discharge electrode will change and the discharge voltage will change significantly, which will not only make it impossible to reliably protect the insulator device from lightning surges, but also make it impossible to protect the insulator device from lightning surges. There was a problem in that the equipment became large due to the use of

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes an upper connecting yoke rotatably attached to the support arm of the tower body via a connecting fitting, and A hanging insulator is attached to the yoke,
A power transmission line is installed at the lower end of the hanging insulator via a lower connecting yoke and a connecting metal fitting, and the upper and lower connecting yokes are formed into a substantially L-shape by a horizontal part and a vertical part, and 'i! with built-in lightning protection element! A lightning unit is cantilever-supported at the base end of the horizontal part, and each lightning protection unit has f! A method is adopted in which shield rings are respectively attached to the tips of the direct division parts so as to surround the hanging insulators, and a predetermined discharge gap is provided between both shield rings.

(Function) By retaining the above means, the present invention functions as follows.

When the power transmission line sways due to wind pressure, etc. and the hanging insulator swings around the upper connecting yoke support point, the lightning arrester unit and the shield ring fixed to its tip swing in sync. , the length of the discharge gap between the upper and lower shield rings and the length of the insulation gap between the hanging insulator and the shield ring are maintained substantially constant.

In addition, since the lightning arrester unit is formed into an almost L-shape with a horizontal part and a vertical part, the rain washing effect is enhanced and the staining characteristics are improved, and by using multiple lightning arrester elements, the lightning arrester unit can be made with a small diameter. , making it easier to manufacture,
Furthermore, it is easy to maintain an insulation distance between the grounding side or energized side of the hanging insulator and the lightning arrester unit, and the lightning arrester unit has a shield ring support function, making the device more compact and suitable for use in existing equipment. Improves sex.

(Example) A hanging metal fitting 2 is fixed to the support arm l with a bolt, and a connecting metal fitting 4 is attached to the hanging metal fitting 2 with a connecting pin 3 so as to be rotatable in a direction perpendicular to the track. An upper connecting yoke 5 is connected to the upper connecting yoke 5 by a connecting pin 6 so as to be rotatable in the track direction. Further, at both left and right ends of the upper connecting yoke 5, two suspension insulator chains 8.9, which are formed by connecting a large number of insulators 7 in series and serve as hanging insulators, are swingably suspended by connecting fittings 1o. Lower supported, double suspended insulators 8.9
A lower connecting yoke 11 is swingably connected to the lower end of the yoke 11 by a connecting fitting 12. Furthermore, the lower connecting yoke l
A plurality of power transmission units 1 are connected to the l by mounting plates 13 and connecting fittings 14.
915 has been constructed.

The left and right ends of the reconnection yokes 5 and 11 each have an I! which is approximately L-shaped and has the same structure. lLightning unit 16-1
9 are supported in a cantilever manner, and at the tip of each unit, as shown in FIG. 3, there is a shield ring 2 whose planar shape is in the shape of a track ring with intermittent portions to facilitate arc discharge.
0.21 is cantilevered so as to surround both the suspension insulators 8 and 9 at a predetermined insulation distance.

The material diameter of the shield link is determined in consideration of the discharge characteristics of the same gap, and is not necessarily configured with the same diameter.

Since it is preferable to configure the discharge characteristics to have an uneven electric field, it is preferable to configure the ground side to have a small diameter.

The specific structure of this lightning protection unit 17 is shown in FIGS. 4 to 7 (
The explanation will be based on a) and (b).

A disk-shaped support bracket 24 is fixed to the upper right side of the upper connecting yoke 5 as shown in FIG. At the tip of the horizontal lightning arrester unit 25, a connecting fitting 27 shown in FIG. 6 is attached to the bolt 2.
8, and a vertical lightning arrester unit 29 as a vertical portion is suspended and fixed to the lower surface of the connecting fitting 27 by bolts 30.

The horizontal lightning arrester unit 25 will be explained based on FIG. 4. It is a horizontal cylindrical pressure-resistant insulator made of reinforced plastic or the like with a large number of pressure relief holes 31a (which also serve as passages for the rubber mold 44 described later). ,? A cylindrical ground electrode 32 fixed to the support bracket 24 is fitted and fixed to the left end of the i31 with adhesive, and the connecting fitting 27 is fitted to the right end of the i31.
A cylindrical power supply electrode 33 with a bottom is fitted and fixed with an adhesive.

An element assembly 34 is housed within the voltage-resistant insulating cylinder 31. This element assembly 34 integrally contains a large number of lightning arrester elements 36 made of zinc oxide or the like connected in series through thin plate electrodes 35, electrode fittings 37 and 38 connected to both ends thereof, and these members. The engaging protrusion 38a of the electrode fitting 38 in the energizing example is an engaging cylindrical portion 3 integrally formed in the center of the energizing side electrode 33.
3a. (See FIG. 7(b)) A disk-shaped fastening fitting 40 is screwed onto the inner circumferential surface of the ground side electrode 32, and the fastening fitting 40 and the grounding side electrode fitting 37 are connected together. In between, the spring holder is a member 41 and a compression spring 4 having a coil shape.
2 is interposed so that the element assembly 34 is fixed by pressure contact between the clamping fitting 40 and the voltage-supplying electrode 33. moreover,
A shunt 43 for supplying current is attached to the compression spring 42.

With the above-mentioned members assembled, the voltage-resistant insulating cylinder 3
A rubber mold 44 is applied to the outer peripheral surfaces of the first and both electrodes 32 and 33 and the gap between the voltage-resistant insulating cylinder 31 and the element assembly 34. At this time, the rubber mold 44 is slightly bulged (see FIG. 5) from the passage 40a formed on the outer periphery of the fastening fitting 40 to the surface of the joint end of the ground electrode 32, thereby forming a seal portion 44a.

In this way, the horizontal lightning protection unit 25 is configured.

The vertical lightning arrester unit 29 has the same structure as the horizontal lightning arrester unit 25, so a description thereof will be omitted.

By the way, the distance between the suspended insulator and the shield ring is necessarily limited because the arc caused by the creeping flash of the insulator is induced in the shield ring, and this aspect affects the length of the horizontal unit 25.

As shown in FIG. 5, a conductive bracket 4 is provided on the lower surface of the energized side electrode 33 at the lower end of the vertical lightning protection unit 29.
The shield ring 21 is supported via 5.

Next, the operation of the lightning insulator device for power transmission lines constructed as described above will be explained.

Now, when a surge current due to a lightning strike enters the power transmission line 15 and flows to the lower connecting yoke 11 via the connecting fitting 14 and the mounting plate 13, it passes through the element assembly 34 in the lightning protection unit 18 and 19 to the shield. The discharge is discharged from the ring 21 to the upper shield ring 20, and then to the upper lightning protection unit 1-
16. Support bracket 24 via element assembly 34 in 17
, flows to the upper connecting yoke 5, connecting fitting 4, hanging fitting 2 and support arm 1, and is grounded from the tower body. Further, subsequent flow that occurs thereafter is blocked by the element assembly 34.

Now, in the embodiment of the present invention, each lightning protection unit 1-1
6 to 19 are connected and fixed to the upper and lower connecting yokes 5°11, so when the power transmission line 15 shakes due to wind pressure etc. and the suspension insulator chain 8.9 swings, each lightning protection unit 16 to 19
The insulation distance between the suspension insulator chain 8.9 and the lightning protection units 16 to 19 and the discharge gap between both shield rings 20 and 21 are kept almost constant, and the discharge characteristics are stabilized. can be converted into In addition, in the embodiment of the present invention, each of the lightning arrester units 16 to 19 is bent into a substantially L-shape, so that the rain washing effect is enhanced and the staining property is improved, and by using a plurality of lightning arrester elements, the lightning arrester unit is The diameter is reduced, making it easier to manufacture, and furthermore, it is easy to maintain an insulation distance between the grounding side or the energized side of the hanging insulator and the lightning arrester unit, and the lightning arrester units 16 to 19 also serve as shield ring support functions. This reduces the size of the device and improves its applicability to existing equipment.

Note that the present invention may be embodied as follows.

(1) The lightning arrester units 16 to 19 can be supported on one side of the connecting yoke 5.11 as shown in Fig. 8, supported on both sides as shown in Fig. 9, and a suspension insulator (not shown) To arrange annular shield rings 20, 21 having intermittent parts around the series as a series.

(2) Lightning protection unit) 16 to 19 as shown in Figure 10
A plurality of lightning arrester units 46 are connected in series in an L-shape.

(3) In the above embodiment, the lightning protection units 16 to 19 were installed symmetrically, but they should be installed only on one side.

(4) In the embodiments shown in FIGS. 1 and 1O, either the left or right side is an L-shaped support insulator that does not have a lightning protection function.

(5) Although not shown, a long stem insulator should be used as the hanging insulator.

(6) Although not shown, bend the tip of the vertical lightning arrester unit 29 toward the suspension insulator chains 8 and 9.

Effects of the Invention As detailed above, the present invention is capable of stabilizing the discharge characteristics by keeping the discharge gap between shield rings constant even when the power transmission line oscillates due to wind pressure, etc. The insulation gap between the insulator and the shield ring can also be maintained at a constant level, improving the rain washing effect and improving fouling characteristics. By using multiple lightning arresting elements, the lightning arrester unit can be made smaller in diameter, making it easier to manufacture. Furthermore, it is easy to maintain an insulation distance between the grounding side or energized side of the hanging insulator and the lightning arrester unit, which also stabilizes the discharge characteristics, and the lightning arrester unit can also serve as a shield ring support function. This has the effect of reducing the size of the device and improving its applicability to existing equipment.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a right side view of the lower lightning protection unit, and Fig. 3 is A-A in Fig. 1.
4 is an enlarged semi-sectional view of the horizontal lightning arrester unit; FIG. 5 is an enlarged semi-sectional view of the vertical lightning arrester unit; FIG. 6 is a perspective view of the support bracket and connecting fittings; Figure (a) is a cross-sectional view taken along line B-B in Figure 4, and Figure 7 (b) is a cross-sectional view of Figure 4.
A sectional view taken along the line C-C in the figure, FIGS. 8 and 9 are a plan view showing another example of the mounting structure of the lightning protection unit, and
2J is a front view showing another example of the present invention, and FIG. 11 is a front view showing a conventional example. 1... Support arm, 5... Upper connection yoke, 8.9
... Suspension insulator chain as a hanging insulator, 11... Lower connection yoke, 15... Power transmission line, 16-19... Lightning arrester unit, 20.21... Shield ring, 24...
- Support placket, 25... Horizontal lightning arrester unit as a horizontal part, 29... Vertical lightning arrester unit as a vertical part, 44... Rubber mold.

Claims (1)

[Claims] 1. The upper connecting yoke is rotatably attached to the support arm of the tower body via a connecting fitting, and a hanging insulator is attached to the connecting yoke, and the lower end of the hanging insulator is attached to the connecting yoke. A power transmission line is installed in the upper and lower connecting yokes through a lower connecting yoke and connecting metal fittings, and the upper and lower connecting yokes are provided with a lightning arrester formed into an approximately L-shape by a horizontal part and a vertical part and incorporating a lightning arrester element. cantilever-supporting the unit at the base end of the horizontal portion;
A lightning insulator device for a power transmission line, characterized in that a shield ring is attached to the vertical end of each lightning protection unit so as to surround the hanging insulator, and a predetermined discharge gap is provided between both shield rings. 2. The hanging insulator is composed of two sets of left and right suspended insulators.
Lightning arrester units are installed symmetrically on both left and right ends of the upper and lower connecting yokes that connect both suspension insulator chains, and both lightning arrester units have track-shaped shields surrounding the suspension insulator chains. The lightning insulator device for a power transmission line according to claim 1, wherein a ring is attached. 3. Lightning arrester units are installed vertically symmetrically on one side of the upper and lower connecting yokes, and L-shaped support insulators that only have an insulation support function are installed vertically symmetrically on the other side. The lightning insulator device for a power transmission line according to claim 1, wherein the support insulator and the support insulator are formed symmetrically.