JPH02103822A - Lightning-proof horn insulator device - Google Patents

Abstract

PURPOSE:To improve performance by reducing an air discharge gap between the discharge part of a discharge electrode on the charge side and the discharge part of a discharge electrode on the ground side, thereby making discharge easy for lightening impulse as well as making discharge difficult for open/close impulse. CONSTITUTION:When a surge current resulting from lightning is applied to a power transmitting wire 9 in a lightning horn insulator device, the current flows to horn mounting fittings 7 on the charge side from a wire clamp 10, and discharge is made at an air discharge gap G between both discharge parts 23a, 21a of discharge electrodes 23, 21, finally it flows to a support arm 1 via a mounting adaptor 14, then discharged to the ground from an iron tower. The frequent current is restrained or blocked by the gap G and a current flow limiting element in a lightning protection insulator 15. The gap G can be controlled so that it is possible to make discharge easy for lightning impulse while to make discharge difficult for open/close impulse as the resistance increases by reducing the gap length. It is thus possible to widen the application in a range from high to low voltage by setting the gap properly.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is designed to quickly ground a power transmission line when high voltage caused by lightning is applied to the power transmission line, and to interrupt subsequent arcing. , relates to a lightning-proof horn insulator device that prevents ground faults and can retransmit power even if the lightning protection element fails by insulating the air discharge gap with a structure that can withstand switching surges (switching impulses) when the circuit is restarted. It is something.

[Prior Art] This type of conventional lightning protection horn insulator device supports a power transmission line via a support insulator on a support arm of a steel tower, supports a lightning arrester horizontally on the tower, and has an insulator attached to the tip of the power transmission line. A power transmission line is connected through the insulator, a pair of circular ring-shaped discharge electrodes are supported facing each other with a predetermined discharge gap on the outer periphery of the insulator 1i13, and the discharge electrode of section u fltl+ is connected to the power transmission line, A configuration in which the discharge electrode of ground 1 (C 1) is connected to a lightning arrester has been proposed.

[Problems to be Solved by the Invention] However, in the conventional configuration described above, the pair of circular ring-shaped discharges 'S and the frame are insulated 6! Since the 16J is inserted and supported on the outer circumference of the insulator, if the insulator becomes contaminated and its dielectric strength decreases, the flashover voltage (f・0・V) of the lightning impulse and the switching impulse will become unstable and the characteristics will change. This caused problems such as the inability to handle lightning surges and failure to restart the route.

In addition, as in this conventional device, the discharge on the power supply side and the ground side
In a structure in which E & is formed into a circular ring shape and supported by an insulator, the spatial arrangement of the discharge electrode is limited to the vicinity of the wire, so it is important to improve the characteristics by the spatial arrangement, which is the main factor in addition to the effect of the electrode shape. Looking forward to it! Since there is no knee, it is not possible to significantly improve the insulation level for switching impulses compared to insulation against lightning impulses, and there is a problem that it is difficult to apply to 275KV and 500KV class lines where switching surge generation levels are low compared to normal operating voltage. Ta.

This invention was made by focusing on the problems existing in the conventional technology, and its purpose is to improve the discharge part of the discharge electrode on the energized side and the discharge part of the discharge electrode on the ground side. By reducing the air discharge gap between the parts and the parts, it is possible to easily discharge against lightning impulses and measure insulation coordination, and to increase the resistance against opening and closing impulses, making it difficult to discharge. , by ensuring insulation that can withstand switching impulses when re-energizing, even when the lightning arrester has failed.
It is possible to secure an insulation level that will not cause failures in retransmission, and it can be applied not only to high voltages but also to low voltages.
Moreover, it is an object of the present invention to provide a lightning-resistant horn insulator device in which flashover voltages of lightning impulses and switching impulses are stabilized, and characteristics can be improved.

[Means for Solving the Problems] - In order to achieve the objective described below, in this invention,
The power transmission line is supported on the support arm of the steel tower via the support insulator,
A lightning arrester is supported at the tip of the support arm, and a discharge electrode on the energized side is connected and supported to the power transmission line, and a pole is provided on the end of the lightning arrester for discharging on the grounding side (a lightning horn). In the insulator device, the discharge portions of the discharge electrode on the energized side and the discharge electrode on the ground side are both formed into a ring shape having an arcuate portion, and these discharge portions face each other across a predetermined air discharge gap. This is what I did.

In the lightning horn 61 device of the present invention configured as described above, the discharge portions of the discharge electrodes on the energizing side and the grounding side are each formed in a ring shape having an arcuate portion, and the discharge are arranged opposite to each other with a predetermined air discharge gap,
In addition, since the power supply side and the grounding arm can be placed in an appropriate spatial position that controls the degree of influence, it is possible to reduce the air discharge gap and make it easier to discharge against lightning impulses. Regardless, the resistance to opening/closing impulses can be increased to make it difficult to discharge.

In addition, since both ring-shaped discharge parts are arranged opposite to each other with an air discharge gap between them without intervening an insulator, the dielectric strength decreases as the insulator becomes soiled, causing lightning impulses and switching impulses to decrease. The flashover voltage will not become unstable.

[Example] Hereinafter, the first lightning-proof horn guard device embodying the present invention will be described.
An embodiment will be described in detail based on FIGS. 1 to 4.

As shown in FIG. 1, a hanging metal fitting 2 is attached to a support arm 1 of a steel tower, and a pawn fitting 4 is connected to this hanging metal fitting 2 via a U clevis 3. A support insulator 5 is suspended from the horn mounting bracket 4 so as to be swingable in the direction of the railway line and in a direction perpendicular thereto. There is.

A horn mounting bracket 7 is connected to the lower end of the support insulator 5.
A wire clamp 10 for supporting a power transmission line 9 is attached to the horn handle 4 metal fitting 7 via a connecting ring 8. Arcing horn 1 is attached to both horn mounting brackets 47.
1 and 12 are attached, and this arcing horn 1.1.1
2, damage caused by creeping flash to the support forceps 5 during an abnormal lightning strike is reduced.

A mounting adapter 14 is fixed to the tip of the support arm 1 in a cantilevered manner and extends in the same direction as the line direction. On the lower surface of the tip of the mounting adapter 1, a pair of lightning arresters 15 are suspended and fixed in a series-connected state. Each lightning insulator 1
5 is a voltage-current characteristic mainly composed of a voltage-resistant insulating tube (not shown) formed in a cylindrical shape from a tensile material such as PRP, and zinc oxide (Zr+0) housed in series inside the tube. A non-linear current limiting element (not shown) and a voltage-resistant insulating tube.
It is composed of cap-shaped electrode fittings 1.6, 1.7 of the grounding side and the charging example, which are fitted and fixed to the lower ends, and molded rubber 18 provided on the outer periphery of the voltage-resistant insulating tube.

Arcing rings 19.20 are provided opposite to the electrode fittings 16 and 1.7 of each lightning arrester 6''JR15, and these arcing rings 1.9.20 prevent creeping flash of the molded rubber 18. The discharge electrode 21 on the grounding side is housed in the charging side electrode fitting 17 at the lower end of the lower lightning arrester 15.As shown in FIG. The discharge electrode 21 is composed of an oval ring-shaped discharge part 21a having an arcuate part, and a mounting plate 22 welded to the intermediate part thereof.

The horn mounting bracket 7 on the charging side has a discharge electrode 2 on the charging side.
3 is supported via a support plate 24.

As shown in FIGS. 3 and 4, the discharge electrode 23 on the energizing side includes a hairpin-shaped ring-shaped discharge section 23a having an arcuate section, and a pair of brackets 25 welded to both ends of the discharge section 23a. Both brackets 25 are rotatably attached to the support plate 24 by pins 26. As shown in FIG. 1, the discharge part 21, a of the discharge @ electrode 21 on the ground side and the discharge part 2 of the discharge electrode 23 on the energized side.
3a are arranged opposite to each other with a predetermined aerial discharge gap G therebetween.

As shown in FIG. 4, bent portions 24a are provided at both ends of the support plate 24, and adjustment bolts 24a are provided on the bent portions 24a.
7 are screwed together. By adjusting the rotation of the adjustment bolt 27 and fixing it with the fixing nut 28, the discharge electrode 23 on the energizing side is rotated to a predetermined position, and the aerial discharge gap G is adjusted and set to a predetermined value. It is now possible to do so.

Next, the operation of the lightning horn insulator device constructed as described above will be explained.

Now, in this lightning-proof bone insulator device, when a surge current caused by a lightning strike is applied to the power transmission line 9, the current flows from the wire clamp 10 to the horn mounting bracket 7 on the charged side, and both discharge electrodes 23, 21 A discharge occurs in the air discharge gap G between the discharge parts 23a and 21a, and further, the current limiting element of the electrode fitting 17, the lower lightning arrester 15, the electrode fittings 1.6, 1.7, and the current limiting element of the lower lightning arrester 15. Element, electrode gold! 4.16 and the mounting adapter 4 to the tower support beam 1, where it is discharged from the tower to the ground. In addition, subsequent currents that occur thereafter are suppressed and blocked by the air discharge gap G between the discharge portions 23a and 2ta of the discharge electrodes 23.21 and the current limiting elements in both the lightning arresters 15.

Now, in this embodiment, as described above, the discharge portions 23a, 21a of the discharge electrodes 23, 2 on the energizing side and the grounding side are each formed in a ring shape having an arcuate portion, and the discharge portions 23a and 21a are placed opposite each other with a predetermined air discharge gap G, and can be placed in an appropriate space position that takes into account the degree of influence of the energizing side and the grounding arm. Even if the gap length of the discharge gap G is set small to facilitate discharge against lightning impulses, the resistance becomes high and it becomes difficult to discharge against opening/closing impulses. Therefore, by appropriately setting this aerial discharge gap G, it becomes possible to apply the method over a wide range of voltages from high to low voltages.

In addition, in the configuration of this example, when the voltage of lightning surge and switching surge with respect to the air discharge gap G was actually measured,
The results shown in FIG. 21 were obtained. As is clear from this graph, in the case of a gap length of 1000n+m, the lightning impulse is the same for both the conventional example and the present invention.
At 1 KV, the opening/closing impulse (fludge 1 over voltage) was 510 KV in the conventional case and 680 KV in the present invention, which is approximately 30% higher than the conventional example.

In addition, in the lightning-proof bone insulator device of this embodiment, the discharge parts 23a, 21a of both discharge electrodes 23, 21 formed in a ring shape having an arcuate part can be connected to the air discharge gap without using an insulation layer or the like. Because they are placed opposite each other with G in between,
The flashover voltage of lightning impulses and switching impulses will not become unstable due to the dielectric strength decreasing due to contamination of the insulator, and the flashover voltage will always be maintained in a stable state to improve the characteristics. Can be done.

(Another Embodiment) Next, another embodiment of the present invention will be sequentially described with reference to the drawings from FIG. 5 onwards.

First, a description will be given of the second example of the real square assembly of the present invention shown in FIGS. 5 to 8. As shown in FIG. . Tension-resistant support insulators 5 are connected and supported at both left and right ends of the mounting plate 31 via tower-side connecting fittings 33, and at the energized side end of each support insulator 5, electric wire-side connecting fittings 34 are connected. A power transmission line 9 is installed and supported. The connecting fittings 33 and 34 on the tower side and electric wire side are equipped with arcing horns 11°1
2 are provided so as to face each other. A pair of jumper wires 35 are connected and fixed at both ends of the two electric wire side connecting fittings 34, and extend in an arc shape between the two wire side connecting fittings 34.

A pair of lightning protection glasses 15 connected in series are suspended from the tip of the support arm 1. Each lightning arrester 15 is constructed in the same manner as in the first embodiment described above, and therefore will be given the same reference numerals and a description thereof will be omitted.

A bracket 36 is fixed to the power supply side electrode fitting 17 at the lower end of the lower lightning arrester 15, and a ground side discharge bridge 21 is attached to this bracket 36. As shown in FIG. 6, the ground-side discharge electrode 21 includes an oval ring-shaped discharge part 21a having an arcuate part, a pair of support rods 37 welded to the intermediate part of the discharge part 21a, and 37 and a mounting plate 38 welded and fixed therebetween.

As shown in FIG. 5, FIG. 7, and FIG. 8, a pair of three support plates are supported via clamps 40 between the jumpers 135 below the lightning arrester 15, and at the center of their upper surfaces. A threaded rod 41 is provided upright. Double threaded rod 4
A discharge electrode 23 on the energizing side is attached to the upper end of the power supply electrode 1 with a nut 42 so that its vertical position can be adjusted. The discharge electrode 23 on the energizing side is fixed by welding between a ring-shaped discharge portion 23a having circular arc portions at the upper portions on both the left and right sides and at lower portions on both the front and rear sides, and the circular arc portions on the left and right sides of the discharge portion 23;i. The front shape is composed of a 'shaped handle' metal fitting 43.

Then, as shown in FIG. 5, the discharge electrode 2 on the ground side
1 of the discharge section 2]a and the discharge section 2 of the discharge electrode 23 on the power supply side.
'3a are arranged opposite to each other with a predetermined air discharge gap G, and by adjusting the height iF1 of the discharge electrode 23 on the energizing side, the gap length of this air discharge gap G can be arbitrarily set. It is now possible to do so.

In the lightning protection horn device of this embodiment configured as described above, abnormal high voltage caused by a lightning strike is now applied to the power transmission line 9.
When the current is applied to the discharge electrode 23 on the energized side via the jumper wire 35, the current is discharged in the air discharge gap G between the discharge electrode 23 and the discharge electrode 21 on the ground side. At the same time, it flows to the support arm 1 of the steel tower via the current limiting elements in both lightning arrester hooks 15 and is grounded. Subsequent arcs generated thereafter are suppressed and blocked by the air discharge gap G and the current limiting element.

Also in this second example, as in the case of the first example, the discharge electrodes 23, 21 on the energizing side and the grounding side
The discharge portions 23a, 21a are each formed in a ring shape having an arcuate portion, and the discharge portions 23a,
2) Since they are arranged facing each other with a predetermined air discharge gap G, although it is possible to reduce the air discharge gap G and make it easier to discharge against lightning impulses, In contrast, the resistance can be increased to make it difficult to discharge.

Next, a third embodiment shown in FIGS. 9 and 10 will be described. In this embodiment, a horn mounting bracket 7 is provided at the lower end of the support insulator 5, as in the first embodiment, A clamp metal B for clamping the jumper wire 35 is attached to the lower part of the jumper wire 35, and in this embodiment, the discharge electrode 23 on the energizing side is a horseshoe-shaped ring-shaped discharge part 23a having an arcuate part. The horn mounting bracket 7 is attached to the horn mounting bracket 7 at both ends thereof.

In this third embodiment, the above-mentioned first
The same effects as in the examples can be expected.

Furthermore, to explain the fourth embodiment shown in Figs. A clamp 47 for the jumper wire 35 is attached to the lower part of the jumper wire via a clamp plate 46.
is installed.

Furthermore, as shown in FIGS. 13 and 14, the ground-side discharge electrode 21 in these examples has a circular ring-shaped discharge portion 21.
a, and a mounting plate 48 welded and fixed to the intermediate portion thereof. Then, by screwing the bolt 50 into the lower bracket 49 of the lightning arrester 15 through the elongated hole 718a provided in the mounting plate 48, the ground side discharge @[i21 is fixed so as to be adjustable in position. Air discharge gap G
The gap length can be set arbitrarily.

Further, as shown in FIG. 15, the discharge electrode 23 on the energizing side of this embodiment is composed of a circular ring-shaped discharge section 23a and a mounting plate 51 welded and fixed to the intermediate part thereof. . A support bolt 52 passing through this mounting plate 51
The discharge electrode 23 on the energizing side is movably supported by the horn mounting bracket 7, and a fixed pole is connected to the horn mounting bracket 7 via the arc-shaped elongated hole 5] provided in the mounting plate 51. By screwing I.53, the discharge electrode 23 on the power supply side is fixed at a predetermined rotational position. Therefore, in this fourth embodiment as well, the above-mentioned first
The same effects as in the examples can be expected.

Next, in a fifth embodiment shown in FIG. 16, similar to the first embodiment not shown in FIG. In the suspended type electric wire support forceps device, the support arm 1
A lightning arrester 6G7'15 is horizontally supported on the side of the lightning arrester 6G7'15 via a mounting bracket 511. In this embodiment, the discharge electrode 21 on the grounding side and the discharge electrode 23 on the charging side are each formed into a horn shape, and an oval ring shape is formed at the tip of the horn shape as shown in FIG. 20(a). Circular ring-shaped discharge section 21. a, 23a are provided, and this discharge section 2
1a and 23a face each other with a predetermined aerial discharge gap G.

In addition, in the sixth embodiment shown in FIG. 17, the support arm 1 of the steel tower has a support 6, similar to the second embodiment shown in FIG.
In a tension type electric wire support insulator device in which a power transmission line 9 is supported via a wire 5, a lightning arrester 15 is supported horizontally at the tip of a support arm 1 via a support fitting 55. , the ground side discharge electrode 21 is attached to the tip of the lightning arrester 15 via a rotation support node 56, and
Electric wire side connecting fitting 3 of the discharge electrode 23 or support insulator 5 on the power supply side
It is attached to 4. Also in this embodiment, as in the fifth embodiment, the grounding side discharge electrode 21 and the charging side discharge electrode 23 are each formed into a horn shape, and their tips are shown in FIG. 20(b). As shown in the figure, discharge parts 21a and 23a in the shape of an oval ring and a circular ring are provided, and the discharge parts 21a and 23a are arranged in a predetermined air discharge gap G.
is being faced with a

Furthermore, in the seventh embodiment shown in FIG.
are attached in a V-shaped connected state, and the power transmission line 9 is supported at the lower end of the support insulator 5. In the hanging type support shoulder device, an adapter attached to the tip of the support arm 1. A lightning arrester 621 and 15 are supported through 14. Also in this embodiment, the discharge@poles 21 and 23 on the grounding side and the charging side are constructed in the same manner as in the fifth embodiment, and as shown in FIG. 20(c), their oval shapes Discharge part 21 having a ring shape or a circular ring shape
a, 23a are arranged facing each other with a predetermined air discharge gap G between them.

Next, in the eighth embodiment shown in FIG. 19, in a jumper wire support insulator device in which a power transmission line 9 is supported on a support arm 1 of a steel tower via a support 67 made of a long support insulator 5, A lightning arrester 15 is supported at the tip of the arm 1 via a mounting adapter 14. Also in this embodiment, the discharge electrode 21 on the grounding side and on the charging side
．． 23 is constructed in the same manner as in the fifth embodiment, and the discharge portion 21a has an oval ring shape and a circular ring shape.
, 23a are arranged facing each other with a predetermined aerial discharge gap G. Also in each of the fifth to eighth embodiments, both discharge electric camellias 21. , 23 discharge parts 21a,
23; Since the upper parts are arranged opposite to each other with the aerial discharge gap G in between, the same effects as in the first embodiment described above can be expected.

Note that the present invention is not limited to the configuration of the embodiment described above, and for example, instead of forming the discharge electrode in a ring shape, a plurality of small ring-shaped electrodes may be used as shown in FIGS. 22 and 23. may be used in parallel. In this case, it is possible to standardize the ring-shaped electrode, and as a combined effect, there is also the advantage that the diameter of the material can be made slightly thinner compared to the giant-shaped electrode. Discharge electrode 2 shown in each of the first to eighth embodiments]
, , 23 may be replaced with each other, and the configuration of each part may be arbitrarily changed without departing from the spirit of the present invention.

[Effect of the invention] Since this invention is configured as explained above,
Although it is possible to reduce the air discharge gap between the discharge part of the discharge electrode on the energized side and the discharge part of the discharge electrode on the ground side to make it easier to discharge against lightning impulses, switching The resistance increases against impulses, making it difficult to discharge, making it applicable to low voltages.Furthermore, the flashover voltage of lightning impulses becomes stable, making it possible to improve the characteristics. It has this excellent effect.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a first embodiment of a lightning-resistant pawn insulator device embodying the present invention, Fig. 2 is an enlarged bottom view showing the discharge electrode on the grounding side, and Fig. 3 is a bottom view showing the discharge electrode on the energized side. An enlarged plan view showing the discharge electrode and arching horn, FIG. 4 shows the charging 11+,! It is a partial front view which expands and shows the attachment structure of the discharge electrode of I. Fig. 5 is a front view showing a second practical example of the lightning horn insulator device of the present invention, Fig. 6 is a bottom view showing an enlarged view of the discharge side on the grounding side, and Fig. 7 is the energizing side. FIG. 8 is a sectional view taken along line A--A in FIG. 7. FIG. 9 is a plan view of part 1 of the third embodiment of the lightning horn insulator device of the present invention, and FIG. 10 is a bottom view of the supporting insulator portion thereof. FIG. FIG. 12 is a bottom view of the supporting insulator portion of the fourth embodiment, FIG. 13 is a partial front view showing an enlarged view of the ground side radiation E E &, and FIG. A cross-sectional view taken along line B-B, and FIG. 15 is a partial pressure m1 diagram showing an enlarged view of the discharge electrode on the energizing side. FIG. 16 is a front view showing the fifth example of the lightning protection horn insulator device of the present invention. 17 is a plan view showing the sixth embodiment of the lightning protection horn insulator device, FIG. 18 is a front view showing the seventh embodiment, and FIG. 19 is a front view showing the eighth embodiment. Figures 20 (a) to (c) are perspective views showing the shape of the discharge electrode, Figure 21 is a graph showing the relationship between the cap length and flashover voltage, and Figures 22 and 23 are side views of the discharge electrode. It is a plan view showing 1... support arm, 5... support insulator, 9... power transmission line, 15... lightning arrester, 21... ground side discharge electrode, 21a... discharge Part, 23...discharge electrode on the charging side;
23a...Discharge part, G...Air discharge gap. Patent applicant: Nippon Insulator Co., Ltd. Agent
Patent Attorney On 1) Hironobu-IIM- m= 1112 Figure Mu Yumi

Claims (1)

[Claims] 1. A power transmission line (9) is supported on a support arm (1) of a steel tower via a support insulator (5), and a lightning arrester (15) is attached to the tip of the support arm (1). A lightning horn insulator device, which supports the power transmission line (9) and connects and supports a charging side discharge electrode (23), and provides a grounding side discharge electrode (21) at the end of the lightning arrester (15). In, the discharge electrode (23) on the energized side and the discharge electrode (23) on the ground side
The discharge portions (23a, 21a) of 21) are both formed in a ring shape having an arcuate portion, and the discharge portions (23a, 21a) of
21a) facing each other with a predetermined air discharge gap (G).