JPH071653B2 - Lightning protection horn insulator device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention quickly grounds a high voltage caused by lightning when it is applied to a transmission line, and shuts off a follow-up arc generated thereafter. The present invention relates to a lightning protection horn insulator device capable of preventing a ground fault and capable of withstanding impulse voltage during reclosing and retransmitting power even if the lightning protection element part should fail. is there.

[Prior Art] Conventionally, as a lightning protection horn insulator device of this type, a power transmission line is supported on a support arm of a steel tower through a support insulator, and a lightning protection insulator is supported at a tip end of the support arm, and a power is applied to the support insulator. Side discharge electrodes are connected and supported, grounding side discharge electrodes are provided at the end of the lightning protection insulator, and the charging side and grounding side discharge electrodes are formed into rod shapes, respectively, and these are arranged in a predetermined air discharge gap. A configuration in which they are opposed to each other is known.

[Problems to be Solved by the Invention] However, in this conventional lightning protection horn insulator device,
Since the discharge electrodes on the charging side and the grounding side are each formed in a rod shape, the opening / closing impulse characteristic with respect to the gap length of the air discharge gap G between the two discharging electrodes is that of a rod-to-rod electrode, and a predetermined opening / closing impulse is obtained. In order to withstand it, it is necessary to secure a gap length corresponding to this, and it is necessary to increase the number of support insulators to ensure insulation coordination characteristics with support insulators. There is a problem that it may be difficult to apply it to a steel tower.

In order to solve this problem, the applicant of the present invention recently formed discharge electrodes on the charging side and the grounding side in a ring shape, respectively, and made them face each other with a predetermined air discharge gap in the same plane or orthogonal planes. A lightning protection horn insulator device is proposed. In this device, the discharge electrodes on the charging side and the grounding side were double-pair double or single-pair single.

However, in the double-to-double or single-to-single discharge electrode configuration, the flashover voltage characteristic with respect to the opening / closing impulse becomes high, and the air discharge gap can be shortened, but the facing area of the discharge electrodes is There is a problem that the lightning impulse flashover voltage tends to increase in comparison with the rod-to-rod discharge electrode configuration in terms of electrostatic partial pressure with the lightning protection insulator, since it tends to be larger than the rod electrode.

Further, in the single-to-single discharge electrode structure, the diameter of the discharge electrode on the charging side is large and the streamer easily extends, so that there is a problem that the opening / closing impulse flashover voltage is unlikely to rise in the water-filled state. Further, in order to make the positive and negative lightning surge flashover voltages close to each other, which is preferable in terms of insulation coordination characteristics, it is necessary to relax the electric field of the discharge electrode on the voltage applying side from the ground side.

An object of the present invention is to provide a lightning protection horn insulator device capable of improving the insulation cooperation characteristic without significantly lowering the switching impulse characteristic with respect to the above invention.

[Means for Solving the Problems] In order to achieve the above object, the present invention supports a power transmission line on a support arm of a steel tower via a support insulator, and supports a lightning arrester at the tip of the support arm. In a lightning protection horn insulator device in which a discharge electrode on the power-supply side is connected to and supported by a transmission line, and a discharge electrode on the ground side is provided at the end of the lightning-insulator, the discharge part of the discharge electrode on the power-supply side is doubled. The means of unifying the discharge portion of the discharge electrode on the ground side and providing a predetermined air discharge gap between both discharge portions is adopted.

It is preferable that at least the discharge portions of the charge-side discharge electrode and the ground-side discharge electrode are each formed in an arc shape.

[Operation] According to the present invention, the discharge electrodes on the charging side are doubled at a predetermined interval, while the discharge electrodes on the ground side are singled. Therefore, the facing areas of the discharge parts of both discharge electrodes are double pairs. Compared to the discharge electrode configuration with double discharge part, the number is smaller, the voltage sharing is improved and the sharing voltage in the air discharge gap is increased, which reduces the flashover voltage of lightning impulse and improves the insulation coordination characteristics. In addition, the flashover voltage of the switching impulse does not drop so much as compared with the discharge electrode configuration having the double-to-double discharge section.

[Embodiment] The first embodiment of the lightning protection horn insulator device embodying the present invention will be described below.
An embodiment will be described in detail with reference to FIGS.

As shown in FIG. 1, a support insulator 2 made of a long insulator is suspended and fixed to a tip portion of a support arm 1 of a steel tower by a plurality of bolts 3. A jumper wire 5 is supported on the lower end of the support insulator 2 with respect to the electric wire clamp 4, and both ends of the jumper wire 5 are respectively connected to power transmission lines (not shown) supported by the support arm 1 via a tension insulator device. It is connected. A mounting bracket 6 is fixed to the tip of the support arm 1 and extends horizontally in a direction orthogonal to the line direction.
A lightning protection insulator 7 is suspended and fixed to the tip of the mounting bracket 6 by a plurality of bolts 8.

The lightning protection insulator 7 is made of a pressure-resistant insulating cylinder (not shown) formed in a cylindrical shape with a pressure-resistant material such as FRP and a zinc oxide (ZnO) housed in series inside the voltage-current characteristic is non-linear. Current limiting element 9 and cap-shaped electrode fittings 1 on the grounding side and the charging side that are fitted and fixed to both ends of the pressure-proof insulating cylinder.
0,11 and the mold rubber 12 provided on the outer periphery of the pressure-proof insulating cylinder
It consists of and. Circular arc horns 13 and 14 are provided on the mounting bracket 6 and the electrode fitting 11 so as to face each other, and the arc horns 13 and 14 reduce the damage of the mold rubber 12 when the surface flashes.

A discharge electrode 15 on the charging side is attached to the wire clamp 4 of the support insulator 2 via a ring-shaped attachment body 16.
Further, a discharge electrode 17 on the ground side is attached to the electrode-side electrode metal fitting 11 at the tip of the lightning protection insulator 7 via a mounting plate 18. The discharging portions of the discharge electrodes 15 and 17 on the charging side and the grounding side are arranged to face each other with a predetermined air discharge gap G. Here, the structure of the discharge electrodes 15 and 17 will be described in detail. As shown in FIG. 2 and FIG. 3 (a), the discharge electrode 15 on the charging side has a pair of upper and lower circular ring-shaped discharge portions 15a. Is connected and fixed at a predetermined interval by five connecting rods 15b, and the base end of the upper discharge part 15a is fixed and supported by the mounting body 16 via a support part 15c. The discharge electrode 17 on the ground side has a structure in which a circular ring-shaped discharge portion 17a is fixedly supported by the mounting plate 18 via a support portion 17b.
Then, the upper discharge unit 15a on the power-supply side and the discharge unit 17a on the ground side are
They are opposed to each other with the air discharge gap G in the same plane.

Next, the operation of the lightning protection horn insulator device configured as described above will be described.

In this lightning protection horn insulator device, when a lightning surge current caused by a lightning strike is applied to the jumper wire 5, the current is discharged in the air discharge gap G between the discharge electrodes 15 and 17, and the lightning protection insulator 7 is discharged. It flows into the support arm 1 of the tower through the built-in current limiting element 9 and the mounting bracket 6, and is discharged from the tower to the ground. Further, the subsequent current generated thereafter is suppressed and blocked by the air discharge gap G between the discharge electrodes 15 and 17 and the current limiting element 9 in the lightning protection insulator 7.

In the lightning protection horn insulator device of this embodiment,
Since the discharge parts 15a of the discharge electrodes 15 and 17 on the charging side and the grounding side are formed in a circular ring shape, the discharging part 15a on the charging side exerts the bundle conductor effect, and the gap length of the air discharge gap G is increased. Can be set smaller than in the case of a rod-to-rod electrode, which makes it easier to discharge lightning impulses, but relaxes the electric field for switching impulses, resulting in double-to-double Compared with the electrode configuration, it does not decrease so much.

As shown in FIG. 3 (b), the lower discharge part 15a and the discharge part 17a are opposed to each other, or the upper discharge part 15a is indicated by the hatched line in the figure.
The discharge portion 15a may be arranged so as to face the discharge portion 15a at an intermediate position between the lower discharge portion 15a and the lower discharge portion 15a.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5.

As shown in FIG. 4, the support arm 1 has an upper suspension fitting 31.
The suspension insulator string 32 is supported via the suspension insulator string 32, and the transmission line L is supported at the lower end portion of the suspension insulator string 32 via the lower suspension fitting 33 and the wire clamp 4. A mounting plate 34 is fixed to one side of the electric wire clamp 4, and a discharge electrode on the side of charging is attached to the mounting plate.
15 is attached with bolts. As shown in FIG. 5, the discharge electrode 15 has a semi-arc shaped discharge part 15a and both discharge parts 1a.
A closed loop forming portion 15d that electrically and mechanically connects both ends of 5a to each other, a connecting portion 15b that connects the closed loop forming portions 15d to each other, and further, the connecting portion 15b to the mounting plate 34.
And a support rod 35 that supports the.

On the other hand, a lightning protection insulator 7 is attached to the supporting arm 1 by a mounting bracket 6, and a discharge electrode on the ground side is attached to a lower end portion thereof.
17 are supported. As shown in FIG. 5, the discharge electrode 17 has a circular arc shape and both ends thereof are bent.
It is composed of a and a supporting portion 17b connecting the central portion of the discharging portion 17a to the mounting plate 18.

In this embodiment, both ends of the discharge part 15a of the discharge electrode 15 are mechanically and electrically connected to the closed loop forming part 15d so as to form an electrically closed loop. The electric field generated at the same time can be relaxed similarly to the annular discharge electrode, and the same effect as the first embodiment can be obtained.

Although the discharge part 17a of the discharge electrode 17 is not configured as a closed loop, the reason is that since the discharge electrode is arranged on the ground side, it is not necessary to relax the electric field concentration. The discharge electrode 17 can be reduced in size and weight. The discharge portion 15a of the discharge electrode 15 may have a circular curvature, or may have a configuration in which a straight line portion and arcs at both ends thereof are combined.

[Third Embodiment] Next, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7.

In this embodiment, in the tension-type lightning arrester device shown in FIG. 6, the mounting position of the lightning arrester 7 is on the lower surface of the support arm 1, and the structure of the discharge electrode 15 on the side of charging is shown in FIG. As described above, both ends of the semi-arc-shaped discharge part 15a are connected to each other by the closed loop forming part 15d, and the closed loop forming parts 15d are connected to each other by the connecting rods 15b, and the closed loop forming part 15d is attached to the mounting body. A support rod 35 that supports 16 is formed.

Also in the third embodiment, the discharge characteristics with respect to the lightning impulse and the opening / closing impulse can be improved similarly to the first embodiment described above.

The present invention can be embodied as follows.

As shown in FIG. 8, the discharge electrode 15 on the charging side is formed by integrally forming two discharge portions 15a each having a substantially planar semi-circular shape by a drawing process, and a supporting portion 15c protruding from the central portion thereof. Also good.

Further, as shown in FIG. 9, the two discharge portions 15a of the discharge electrode 15 on the charging side may be formed in a linear shape.

[Effects of the Invention] As described in detail above, the present invention has the effect of improving the insulation coordination characteristics for lightning impulses without reducing the flashover characteristics for switching impulses.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a lightning protection horn insulator device embodying the present invention, and FIG. 2 is an enlarged perspective view showing discharge electrodes on the charging side and the grounding side, and FIG. a) is an enlarged front view of both discharge electrodes, FIG. 3 (b) is a front view showing another example of arrangement configuration of both discharge electrodes, and FIGS. 4 and 5 show a second embodiment of the present invention. FIG. 4 is a front view showing a suspension type lightning arrester, FIG. 5 is an enlarged perspective view showing discharge electrodes on a charging side and a grounding side, and FIGS. 6 and 7 show a third embodiment of the present invention. FIG. 6 is a front view of a tension-type insulator device and the like, FIG. 7 is an enlarged perspective view showing discharge electrodes on the charging side and the ground side, and FIG. 8 is a discharging electrode on the charging side showing another example of the present invention. And FIG. 9 is a perspective view of a discharge electrode on the charging side showing another example of the present invention. 1 ... Support arm, 2 ... Support insulator, 5 ... Jumper wire, 7 ... Lightning arrester, 15 ... Discharge electrode on the charging side, 15a, 17
a: Discharge part, 17: ground side discharge electrode, G: air discharge gap.

Claims (2)

[Claims] 1. A support insulator (2) for a support arm (1) of a steel tower.
Via a power transmission line, a lightning protection insulator (7) is supported at the tip of the support arm (1), and a discharge electrode (15) on the power supply side is connected to and supported by the power transmission line. In a lightning protection horn insulator device in which a ground side discharge electrode (17) is provided at the end of (7), the discharge section (15a) of the charging side discharge electrode (15) is doubled to form a ground side discharge. A lightning protection horn insulator device, characterized in that the discharge part (17a) of the electrode (17) is made single and a predetermined air discharge gap (G) is provided between both discharge parts (15a, 17a). 2. The lightning protection horn insulator device according to claim 1, wherein at least the discharge portions (15a, 17a) of the discharge-side electrode (15) and the ground-side discharge electrode (17) are each formed in an arc shape. .