JPH02309583A - Lightning arrester for power-transmission line - Google Patents

Abstract

PURPOSE:To reduce the bending load acting to iron tower arms from the weight of a lightning arrester by inclining the lightning arrester to keep away the high voltage side end of the lightning arrester from the hanging insulator gang and holding the earthing side end to an installing metal. CONSTITUTION:When the earthing side end of a lightning arrester 6 is installed to an installing metal 11, the lightning arreater 6 is fixed to the free end 11a of the installing metal 11 which is inclined to keep away the high voltage side end of the lightning arrester 6 from a hanging insulator gang 1. As a result, even though the shaft length of the installing metal 11 is made shorter, a sufficient installing distance can be secured between a fixing metal 3a and a discharge electrode 7, and a deflecting burden to iron tower arms 35 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a lightning arrester for power transmission lines used to prevent snow damage to insulators attached to power transmission towers.

[Prior art] As a conventional lightning arrester for power transmission lines, Japanese Patent Application Laid-Open No. 61-2605
The device disclosed in the No. 06 publication is shown in FIGS. 12 and 13. 12 and 13 are a front view and a plan view of the main parts of the lightning arrester for power transmission lines, in which the upper part of the suspension insulator chain 1 is attached to the tip of the tower arm 35, and the lower part of the suspension insulator chain 1 is connected to the main part of the lightning arrester for power transmission lines. ? In addition to supporting iio, Ifj
One end of the mounting bracket 33 is fixed to the c-tower arm 35, and the free end of this mounting bracket 33 is connected to the electric power 4!1 as shown in 13th @.
0, and the upper end of the lightning arrester 6 on the ground side is supported and fixed here. This lightning arrester 6
A discharge pole 7 is attached to the lower end, which is the high voltage side, and a discharge pole 9 is attached to the opposite power side, and a discharge pole 9 is attached to the lX10 side to form a series gap 8, and a pair of arc horns are attached to both ends of the suspended insulator chain 1. 2 and 3 were provided respectively to constitute a lightning arrester for power transmission lines.

[Problem to be solved by the invention] In the conventional lightning arrester for power transmission lines, arc horns, 3
In order to protect the suspension insulator chain 1 from lightning surges, the voltage limit of the lightning arrester 6 is sufficient to prevent flashover between the fixing fitting 3a of the arc horn 3 and the discharge electrode 7 on the high voltage side of the lightning arrester 6. It is necessary to ensure a suitable insulation distance Ω. However, when trying to secure the actually required insulation distance Q, the mounting bracket 3
3, that is, the length from the mounting position to the tower arm 35 to the mounting position of the lightning arrester 6, must be made larger than shown in the figure. A bending load due to the weight of the lightning arrester 6 acts on the portion, which adversely affects the support of the lightning arrester for the power transmission line.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lightning arrester for a power transmission line in which the bending load acting on a tower arm due to the weight of the arrester is reduced.

[Means for Solving the Problems] In order to achieve the above object, the present invention fixes one end of a mounting bracket extending substantially along the power line to the tip of a steel tower arm, and attaches a lightning arrester to the free end of this mounting bracket. The lightning arrester is characterized in that the ground side of the lightning arrester is attached so that the high voltage side is tilted away from the suspension insulator chain.

[Function] Since the lightning arrester for power transmission lines according to the present invention has the above-described configuration, even if the length of the mounting bracket along the power line is made shorter than in the conventional case, there is no damage between the high voltage side of the lightning arrester and the fixing bracket of the arc horn. Sufficient insulation distance can be ensured, therefore,
By shortening the mounting bracket, the bending load acting on the tower arm due to the weight of the lightning arrester can be reduced.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are a front view and a plan view of essential parts of a lightning arrester for power transmission lines according to an embodiment of the present invention.

An arm end fitting 4 is welded to the end of the tower arm 35 of the power transmission line tower 40. A fixing metal fitting 3a is connected to the lower part of this arm end metal fitting 4, and the arm end metal fitting 4
A metal fitting 19 is fixed above with bolts or the like (not shown). A suspension insulator chain 1 is suspended from the fixture 3a, and an arc horn 3 is attached thereto. The lower end of the suspension insulator chain 1 is connected to a fixture 2a to which an arc horn 2 is attached, and this fixture 2a is connected to a power supply &1110.

A mounting bracket 11 is fixed to the aforementioned bracket 19 via a support device 5 shown in FIG. 7, the details of which will be described later. It is mechanically fixed to the steel tower arm 35 shown in FIG. This mounting bracket 11 is attached to a power line 10 as shown in FIG.
It is made of, for example, L-shaped steel, and has a free end 11a that extends along the curve and is bent upward as shown in FIG. Since the ground side of the lightning arrester 6 is fixed to the free end 11a, the lightning arrester 6 is supported with its high voltage side end tilted away from the suspended insulator chain 1. A discharge pole 7 is attached to the high-voltage end of the lightning arrester 6 by a bolt 12, and the discharge pole 7 forms an arc with respect to the power line 10, as shown in FIG. Therefore, even if the power line 10 swings around the fixture 3a shown in FIG. Retained. In this way, a series gap 8 having a predetermined discharge interval is formed between the discharge electrodes 7 and 9.

According to this configuration, if the power line 10 is subjected to an electric shock or the tower arm 35 is struck by lightning, a flash short will occur between the arc horns 2 and 3, resulting in an instantaneous power outage if there is no series gap 8. Since the series gap 8 is formed, lightning surges are discharged between the discharge poles 7 and 9 and absorbed by the lightning arrester 6.

At this time, the insulation distance Q between the grounding side fixing bracket 3a of the suspension insulator chain 1 and the discharge pole 7 is determined by using a mounting bracket with a smaller shaft length than the conventional one, since the lightning arrester 6 is installed at an angle on the mounting bracket 11. 11 can maintain sufficient insulation.

Next, the support device 5 between the metal fitting 19 and the mounting metal fitting 11 will be explained using FIG.

There are cylindrical insulating bases on the top and bottom of the mounting bracket 11 respectively]
, 8 and 20 are arranged, and an insulating pipe 23 is inserted into a series of holes formed in these holes.

The position of this insulating vibrator 23 is the fitting fitting 2 inserted into the series of holes described above from the opposite end of the insulating base 18.20.
2.24. Therefore, as shown in the figure, the bolt 2 is inserted from the fitting fitting 24 side through the insulating pipe 23.
1 and screw this bolt 21 into the metal fitting 19,
The bolts 21 and the metal fittings 19 and the mounting metal fittings 11 can be electrically insulated and mechanically coupled to each other.

According to such a support device 5, while the metal fitting 19 is grounded, the mounting metal fitting 11, that is, the ground side end of the lightning arrester 6 can be electrically floated, and a configuration as described later can be achieved. If the ground side end of the lightning arrester 6 is directly grounded, a conductive member having the same shape may be used in place of the insulating base 18, 20 and insulating vibrator 23 shown in FIG.

3 and 4 are a plan view and a front view showing a lightning arrester for a power transmission line according to another embodiment of the present invention, and only the differences from the embodiment of FIGS. 1 and 2 will be explained. Equivalents are given the same reference numerals and their description will be omitted.

In this embodiment, the shape of the mounting bracket 11 is different from the previous embodiment. In contrast, the mounting bracket 11 in the fifth embodiment has its left end extended by a predetermined length, and the weight of this extension is used to reduce the bending load applied to the tower arm 35.

5 and 6 show a further development of the embodiment shown in FIGS. 3 and 4, in which a balance load 41 is attached to the extended left end of the mounting bracket 11. FIG.

According to this embodiment, the rotational moment acting on the mounting bracket 11 around the support device 5 connected to the bracket 19 is further reduced, and therefore the bending load applied to the tower arm 35 can be further reduced.

FIGS. 8 and 9 show an embodiment in which an operation recorder 26 for detecting the discharge flow flowing into the lightning arrester 6 is attached to the extended left end of the mounting bracket 11 as shown in FIGS. 3 and 4. There is. The mounting bracket 11 is electrically connected to the ground side of the lightning arrester 6, and the grounding is performed by connecting it to the tower arm 35, which is brought to the ground potential, via an operation recorder 26 and a connecting conductor 27. . In this embodiment, as in the embodiment shown in FIG. 4, the left end of the mounting bracket 11 can be extended to obtain the same effect, and the motion recorder 26 can be installed using the extension. .

10 and 11 are a front view and a plan view of a lightning arrester for power transmission lines according to still another embodiment of the present invention, in which a frequency meter 29 is added to the lightning arrester for power transmission lines shown in FIGS. 8 and 9. Equivalents are given the same symbols. A bolt (not shown) is attached to the left end of the mounting bracket 11 to attach the bracket 4.
Fix 2.

A frequency meter 29 is attached to this metal fitting and connected by a connecting conductor 28. The frequency meter 29 and the operation recorder 26 have a well-known structure, and the number of operations and the discharge current are detected by these. In this embodiment as well, the left end of the mounting bracket 11 is extended further than the support device 5, and the attached equipment 26, 29 that acts as the balance load 41 in FIG. This contributes to reducing the unbalanced load on the left and right sides of the structure, thereby reducing the unbalanced load on the tower arm 35. however,
The most remarkable structure that produces this effect is on the right end side of the mounting bracket 11 that is common to each embodiment. That is, when the ground side end of the lightning arrester 6 is attached to the mounting bracket 11, the free end 11a tilts the lightning arrester 6 so that the high voltage side end of the surge arrester 6 is separated from the suspension insulator chain 1.
Even if the right axis length is shortened, the fixing bracket 3a and the discharge electrode 7
A sufficient insulation distance can be secured between them.

Therefore, the unbalanced load acting on the tower arm 35 can be reduced by shortening the right axial length of the 5-mounting bracket 11.

In the above embodiment, the mounting bracket 11 is made of L-shaped steel, but sufficient strength can also be obtained by using U-shaped steel or one welded in an inverted T-shape.

Furthermore, by using, for example, a silicone-based rubber-coated insulator tube as the insulator tube of the lightning arrester 6 instead of a general porcelain tube, the weight of the lightning arrester 6 can be reduced.

For example, a 66kV class lightning arrester using a porcelain insulator 6
is 60 kg, whereas in the case of a silicone-based rubber-coated insulator tube, the weight can be reduced to 25 kg, which is useful for carrying out the present invention.

[Effects of the Invention] As explained above, the present invention has the lightning arrester 6 attached to the mounting bracket 11.
Since the high-voltage side end of the surge arrester 6 is tilted away from the suspension insulator chain 1 when the grounding side end of the lightning arrester 6 is attached, even if the axial length of the mounting bracket 11 is shortened, there is still enough space between the fixing bracket 3a and the discharge pole 7. It is possible to secure an insulation distance of
Unbalanced loads on the steel tower arm 35 to which the mounting bracket 11 is fixed can be reduced.

[Brief explanation of the drawing]

1 and 2 are a front view and a plan view of a lightning arrester for a power transmission line according to an embodiment of the present invention, and FIGS. 3 and 4 are plan views of a lightning arrester for a power transmission line according to another embodiment of the present invention. 5 and 6 are a plan view and a front view of a lightning arrester for a power transmission line according to still another embodiment of the present invention,
FIG. 7 is an enlarged cross-sectional view of the main part of FIG. 1, FIGS. 8 and 9 are a plan view and a front view of a lightning arrester for power transmission lines according to further different embodiments of the present invention, and FIGS. 10 and 11 are FIGS. 12 and 13 are a plan view and a front view of a lightning arrester for a power transmission line according to still another embodiment of the present invention, and FIGS. 12 and 13 are a front view and a plan view of a conventional lightning arrester for a power transmission line. 1... Suspension insulator chain, 2, 3... Arc horn, 3a... Fixing metal fittings, 5... Support device, 6... Lightning arrester, 7... Discharge pole, 8... Series gap, 9... Discharge pole, 10... Power line, 11... Mounting bracket, 26... Operation recorder, 29...
Frequency meter, 35... Steel tower arm, 40...
・Transmission line tower, 41...Balance load. Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11q Figure 12 Figure 13

Claims (1)

[Scope of Claims] 1. A suspension insulator chain with one end fixed to the tower arm and the other end supporting a power line, a pair of arc horns installed in parallel with the suspension insulator chain, and a grounding side end fixed to the tower arm. A lightning arrester supported by a mounting bracket fixed to the
In a lightning arrester for a power transmission line having a series gap formed by the discharge pole and the discharge pole connected to the power line, the surge arrester is tilted so that the high voltage side end of the surge arrester moves away from the suspension insulator chain. A lightning arrester for a power transmission line, characterized in that the ground side end of the lightning arrester is supported by the mounting bracket. 2. The device according to claim 1, wherein the mounting bracket has a free end that extends along the power line and is bent upward, and the ground side end of the lightning arrester is supported on this free end. Lightning arrester for power transmission lines. 3. The lightning arrester for a power transmission line according to claim 1, wherein the mounting bracket is fixed to the tower arm in an electrically insulated state by a support device. 4. The device according to claim 2, wherein the end of the mounting bracket opposite to the free end is extended beyond the part fixed to the tower arm, and a balance load is provided at the opposite end. Lightning arrester for power transmission lines.