JPH0319648B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a lightning protection insulator device for multiple insulators.

(Prior Art) As a conventional suspension insulator device for power transmission lines, there is one shown in FIG. Two suspension insulator chains 8 and 9 are suspended from the support arm 1 of the tower body via an upper connection yoke 5, and a lower connection yoke 11 and a connection metal fitting are attached to the lower ends of both suspension insulator chains 8 and 9. 14
In addition, four arc horns 50 are installed symmetrically on both the upper and lower connecting yokes 5 and 11, so that abnormal current caused by a lightning strike is transmitted from the power transmission line 15 to the connecting fitting 14 and the lower connecting yoke 11.
The electric current is then discharged from the lower arc horn 50 to the upper arc horn 50 to protect the suspended insulator chains 8 and 9.

(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 If 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, it is possible to prevent the transmission line 15 from shaking due to wind pressure or the like. , the discharge gap length between both discharge electrodes changes and the discharge voltage changes significantly, which not only makes it impossible to reliably protect the insulator device from lightning surges, but also increases the size of the device because a dedicated lightning arrester is used. There was a problem.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a structure in which a connecting yoke is rotatably attached to the support arm of the tower body via a connecting fitting, and the connecting yoke is is equipped with one end of a plurality of insulator chains, and a power transmission line is installed at the other end of the insulator chain via a connecting yoke and a connecting metal fitting.Furthermore, both connecting yokes include a first lightning arrester incorporating a lightning arrester. A substantially L-shaped lightning arrester unit consisting of a lightning arrester housing part and a second lightning arrester housing part connected to the first lightning arrester housing part via a connecting fitting is connected to the first lightning arrester housing part. The first lightning arrester housing part is cantilevered at the base end of the second lightning arrester housing part so that the first lightning arrester housing part is substantially parallel to the first lightning arrester housing part, and the multiple insulator chain is surrounded at the tip of the first lightning arrester housing part. A track-shaped shield ring is attached to each of the two shield rings so that a predetermined discharge gap is provided between the two shield rings.

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

When the power transmission line sways due to wind pressure, etc., and the multiple insulator chain swings around the 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 both shield rings and the length of the insulation gap between the multiple insulator series and the shield ring are held substantially constant.
In addition, the first lightning arrester unit is connected with a connecting fitting.
Since it is formed into an almost L-shape by the second lightning arrester storage part, the rain washing effect is enhanced and the staining property is improved. By using a plurality of lightning arrester elements, the lightning arrester unit can be made smaller in diameter, and Since the shapes are connected via connecting metal fittings, it is easier to manufacture.Furthermore, it is easy to maintain the insulation distance between the grounding side or energized side of the multi-insulator chain and the lightning protection unit, making it easy to maintain lightning protection. Since the shield ring support function is added to the unit, the device can be made smaller and
Applicability to existing equipment is improved.

(Example) Hereinafter, an example embodying the present invention is shown in Figs.
To explain based on FIGS. 7a and 7b, a hanging metal fitting 2 is fixed to the support arm 1 of the steel tower with a bolt, and a connecting metal fitting 4 is connected to the hanging metal fitting 2 by a connecting pin 3 and rotates in a direction perpendicular to the railway line. An upper connecting yoke 5 is connected to the connecting fitting 4 by a connecting pin 6 so as to be rotatable in the track direction. or,
At both left and right ends of the upper connecting yoke 5, two suspension insulator chains 8 and 9, which are multiple suspension insulator chains formed by connecting a large number of suspension insulators 7 in series, are swingably supported by connecting fittings 10, respectively. and both suspended insulators 8,
A lower connecting yoke 11 is attached to the lower end of the connecting fitting 1.
2, which are pivotally connected. Furthermore, the lower connecting yoke 11 includes a mounting plate 13 and a connecting fitting 1.
4, a plurality of power transmission lines 15 are installed.

Lightning arrester units 16 to 19 having the same structure and substantially L-shaped are cantilevered at both left and right ends of the connecting yokes 5 and 11, respectively, and each unit has a flat surface at the tip end as shown in FIG. Shield rings 20 and 21 each having a track ring shape with intermittent portions to facilitate arc discharge are supported in a cantilever manner so as to surround both of the suspended insulators 8 and 9 at a predetermined insulating 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 Figure 4~
This will be explained based on FIGS. 7a and 7b.

A disk-shaped support bracket 24 is fixed to the upper right side of the upper connecting yoke 5 as shown in FIG. The horizontal lightning arrester unit 25 is supported cantilevered by
A connecting fitting 27 shown in FIG. 6 is fixed to the tip of the connecting fitting 27 with a bolt 28, and a vertical lightning arrester unit 29 serving as a first lightning arrester housing is suspended and fixed to the lower surface of the connecting fitting 27 with a bolt 30. There is.

The horizontal lightning arrester unit 25 will be explained based on FIG. 4. It consists of a horizontal cylindrical voltage-resistant insulating tube 31 made of reinforced plastic or the like with a large number of pressure relief holes 31a (which also serve as passages for a rubber mold 44 described later) formed through the horizontal lightning arrester unit 25. A cylindrical ground side electrode 32 fixed to the support bracket 24 is fitted and fixed to the left end with adhesive, and a bottomed cylindrical power supply side electrode 33 fixed to the connection fitting 27 is fixed to the right end. are fitted and fixed with 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 via 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 on the charging side is formed of an insulating material 39 for fixing, and the engaging protrusion 38a of the electrode fitting 38 on the charging side is an engaging cylinder 3 integrally formed at the center of the electrode fitting 38 on the charging side.
3a. (See FIG. 7b) Furthermore, a disk-shaped fastening fitting 40 is screwed onto the inner circumferential surface of the ground side electrode 32, and between the fastening fitting 40 and the grounding side electrode fitting 37. A spring receiving member 41 and a coil-shaped compression spring 42 are interposed, and the element assembly 3
4 is fixed by pressure contact between the clamping fitting 40 and the voltage-supplying electrode 33. Furthermore, a shunt 43 for energization is attached to the compression spring 42.

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

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

The vertical lightning arrester unit 29 is constructed in the same manner 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 caused to arc in the shield ring, and this affects the length of the horizontal unit 25.

As shown in FIG. 5, the shield ring 2 is connected to the lower surface of the power-supplying side electrode 33 at the lower end of the vertical lightning protection unit 29 via a conductive bracket 45.
1 is supported.

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 arresting units 18 and 19 and then passes through the shield ring 21. It is discharged from the ground to the upper shield ring 20, and further flows to the support bracket 24, the upper connecting yoke 5, the connecting fitting 4, the hanging fitting 2, and the supporting arm 1 via the element assembly 34 in the upper lightning protection units 16 and 17. , 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 of the lightning protection units 16 to 19 is connected to the upper and lower connecting yokes 5,
11, so when the power transmission line 15 shakes due to wind pressure or the like and the suspension insulator chains 8 and 9 swing, each of the lightning protection units 16 to 19 also swings in synchronization. 9 and lightning protection unit 16~
19 and both shield rings 20 and 2
1 is maintained substantially constant, and the discharge characteristics can be stabilized. In addition, in the embodiment of the present invention, each of the lightning arrester units 16 to 19 is formed into a substantially L-shape, so that the rain washing effect is enhanced and the staining property is improved. 16 to 19 have smaller diameters and are connected in an L-shape via the connecting fittings 27, which increases ease of manufacturing. Since the lightning protection units 16 to 19 also have the function of supporting the shield ring, the device is miniaturized and its applicability to existing equipment is improved.

Note that the present invention may be embodied as follows.

(1) As shown in Figure 8, lightning protection units 16-1
9 on one side of the connecting yokes 5 and 11, or on both sides as shown in FIG.
Furthermore, although not shown in the drawings, annular shield rings 20 and 21 having intermittent portions are arranged around the series of suspended insulators.

(2) As shown in Figure 10, the lightning protection unit 16~
19 is constructed by connecting a plurality of lightning arrester units 46 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 embodiment shown in FIGS. 1 and 10,
Lightning protection units 16 to 19 installed symmetrically
One of the left and right sides should be an L-shaped support insulator that does not have a lightning protection function.

(5) Although not shown, long-stem insulators should be used as the insulators.

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

(7) In the above embodiment, the lightning arrester unit is attached to the connecting yoke of the multiple suspension insulator chain that suspends the power transmission line, but the lightning arrester unit is attached to the connecting yoke of the multiple suspension insulator chain.

Effects of the Invention As detailed above, the present invention provides an L
Since the letter-shaped lightning arrester unit is cantilever-supported by the connecting yoke, it is possible to maintain a constant discharge gap between the shield rings and stabilize the discharge characteristics, and also to maintain the insulation gap between the insulator chain and the shield ring. The lightning protection unit can also be held constant.
Since it is formed in an L-shape with a second lightning arrester storage part, the rain washing effect is enhanced and the staining property is improved, and since a plurality of lightning arresters can be used, the diameter of the lightning arrester unit can be reduced. In addition, the L-shape is connected via a connecting metal fitting, which increases the ease of manufacturing.Furthermore, the lightning arrester unit has a first lightning arrester housing part that supports the shield ring at the tip, which is connected to the insulator. Since it is cantilevered at the base end of the second lightning arrester housing so that it is almost parallel to the lightning arrester unit, it is easy to maintain an insulation distance between the grounding side or energized side of the insulator chain and the lightning arrester unit. Since the lightning protection unit also serves as a shield ring support function, the device can be miniaturized and its applicability to existing equipment can be improved.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figure 2 is a front view showing one embodiment of the present invention;
The figure is a right side view of the lower lightning arrester unit, Figure 3 is an enlarged sectional view taken along the line A-A in Figure 1, Figure 4 is an enlarged half sectional view of the second lightning arrester housing, and Figure 5 is the 1. FIG. 6 is a perspective view of the support bracket and interlocking fittings. FIG. 7a is a sectional view taken along the line B-B in FIG. 4. FIG. 8 and 9 are respectively plan views showing another example of the lightning protection unit mounting structure, FIG. 10 is a front view showing another example of the present invention, and FIG. 11 is a conventional example. FIG. 1...Support arm, 5...Upper connection yoke,
8, 9... Suspended insulators as hanging insulators, 11...
...Lower connection yoke, 15...Power transmission line, 16-19
...Lightning arrester unit, 20, 21...Shield ring, 24...Support bracket, 25...Horizontal lightning arrester unit as second lightning arrester storage section, 2
9... Vertical lightning arrester unit serving as a first lightning arrester storage section, 44... Rubber mold.

Claims (1)

[Scope of Claims] 1. A connecting yoke is rotatably attached to the support arm of the tower body via a connecting fitting, and one end of a plurality of insulator chains is attached to the connecting yoke, and the other end of the insulator chain is attached to the connecting yoke. A power transmission line is installed at the end via a connecting yoke and a connecting metal fitting, and a first lightning arrester storage part incorporating a lightning arrester element and a connecting metal fitting are connected to the first lightning arrester storage part in both the connecting yokes. A roughly L-shaped lightning arrester unit consisting of a second lightning arrester housing section connected via
Cantilevered at the base end of the lightning arrester housing section,
Further, a track-shaped shield ring is attached to the tip of the first lightning arrester storage portion so as to surround the multiple insulator chain, and a predetermined discharge interval is provided between both shield rings. Features: Lightning protection insulator device for multiple insulator series. 2. The above-mentioned multiple insulator chain is composed of two left and right suspension insulator chains, and lightning protection units are installed symmetrically on both left and right ends of the upper and lower connecting yokes that connect both suspension insulator chains. A multiple insulator series lightning insulator device according to claim 1. 3 A lightning arrester unit is vertically symmetrically installed on one side of the upper and lower connecting yokes, and an L-shaped support insulator having only an insulating support function is installed vertically symmetrically on the other side, and the lightning arrester unit and support The lightning insulator device for multiple insulator series according to claim 1, wherein the insulators are arranged symmetrically. 4. The connecting fitting attached to the support arm is supported so as to be rotatable only in the direction perpendicular to the railway line, and the connecting yoke attached to the connecting fitting is connected so as to be rotatable only in the direction of the railway line. A lightning-resistant insulator device for multiple insulator series as described in 2.