JPH071654B2 - 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] As a conventional lightning protection horn insulator device of this type, a transmission line is supported on a support arm of a tower through a support insulator, and a lightning protection insulator is supported at the tip of the support arm, and the support insulator is mounted on the support insulator. The discharge electrode on the charging side is connected and supported, and the discharge electrode on the grounding side is provided at the end of the lightning protection insulator.The discharge electrodes on the charging side and the grounding side are formed in rod shapes, respectively, and they are discharged in the predetermined air. A configuration in which they are opposed to each other with a gap 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 this, it is necessary to secure a gap length corresponding to this, and in order to secure the insulation coordination characteristics with the support insulator, it is necessary to measure the number of support insulators to be increased. 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 coordination characteristics without significantly lowering the switching impulse characteristics with respect to the above invention and further reducing the weight of the discharge electrode. is there.

[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 through a support insulator, and supports the lightning protection insulator on the support arm and connects the power transmission line to the power transmission line. In a lightning protection horn insulator device in which a discharge electrode on the power-supply side is connected and supported, and a discharge electrode on the ground side is provided at the end of the lightning-insulator, the discharge electrode on the power-supply side is a single wire made of a large diameter wire. Alternatively, it is composed of two conductive support rods and a discharge part made of a small-diameter wire attached to the support rods, the discharge part of the discharge electrode on the ground side is made into a single layer, and a predetermined air discharge gap is provided between both discharge parts. Is taken.

[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.

Particularly, in the present invention, the discharge electrode on the charging side is composed of one or two conductive support rods made of a large-diameter wire rod and two discharge portions made of a small-diameter wire rod attached to the support rod. As a result, the electric field relaxation effect due to the bundle conductor effect is slightly reduced and the flashover voltage characteristics are slightly affected, but the weight of the two discharge parts is reduced and a reinforcing member is used to attach the discharge electrode to the wire clamp, etc. Can be done without.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIG. 4, a suspension insulator string 3 as a support insulator is supported on the support arm 1 via a grounding side hanging metal fitting 2,
A transmission line 6 is supported at the lower end of the suspension insulator string 3 via a power-supply-side suspension fitting 4 and an electric wire clamp 5. A mounting plate 7 is fixed to one side of the electric wire clamp 5, and a discharging electrode 8 on the charging side, which will be described in detail later, is mounted to the mounting plate 7 with bolts.

On the other hand, a lightning protection insulator 10 is attached to the support arm 1 by a mounting adapter 9. This lightning protection insulator 10 includes a pressure-proof insulating cylinder (not shown), a ground-side electrode fitting 11 and a power-supply-side electrode fitting 12 fitted and fixed at both ends thereof, and a voltage-current characteristic housed in the pressure-proof insulating cylinder is non-linear. And the lightning protection element 13 of FIG. A grounding-side discharge electrode 14 is supported by the power-charging-side electrode metal fitting 12, and is arranged to face the power-charging-side discharge electrode 8 with a predetermined air discharge gap G. The ground-side discharge electrode 14 is formed by a single arc-shaped discharge portion 14a.

Next, the structure of the discharge electrode 8 on the charging side will be described with reference to FIGS.
Description will be made with reference to FIG.

The discharge electrode 8 includes a conductive support rod 15 horizontally supported and fixed to the mounting plate 7 by bolts, a connecting plate 16 fixed at a tip of the supporting rod 15 at a right angle, and further, a connecting plate 16 of the connecting plate 16. It is composed of a conductive support rod 17, 17 supported on both ends in parallel with each other in a cantilever manner, and a pair of discharge parts 18, 18 attached on the upper side of the both support rods 17, 17, and in this embodiment, the conductive support is provided. The diameter of the rod 17 is 34 mm and the diameter of the discharge part 18 is 19 mm. Further, the support bar 17 and the discharge part 18 are connected and formed in a horizontally long rectangular frame shape so as to electrically form a closed loop.

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

Now, in this lightning protection horn insulator device, when a lightning surge current caused by a lightning strike is applied to the power transmission line 6, the current is applied to the wire clamp 5, the mounting plate 7, the conductive support rod 15, the connecting plate.
16, the conductive support rod 17, and the discharge portion 18 through the air discharge gap G to the discharge electrode 14 on the ground side, and further, the electrode fitting 12, the lightning protection element 13, the grounding electrode fitting 11, and the mounting adapter. 9 and is discharged from the support arm 1 to the ground through the steel tower. Further, the subsequent flow generated thereafter is suppressed and cut off by the air discharge gap G between the discharge electrodes 8 and 14 and the lightning arrester 13.

In the lightning protection horn insulator device of this embodiment, the conductive support rods 17 and the discharge parts 18 of the discharge electrode 8 on the charging side are arranged at the four corners of the quadrangle as shown in FIG. The electric field of the discharge part 18 (see the chain double-dashed line in the figure) is relaxed compared to the case of the rod-to-rod electrode, and the gap length of the air discharge gap G can be set smaller than that of the rod-to-rod electrode. Even if the lightning impulse flashover voltage is lowered by this, the electric field is relaxed against the switching impulse, so that it is not so lowered as compared with the double-to-double electrode configuration.

In particular, in the present invention, the wire diameter of the discharge portion 18 is made smaller than the wire diameter of the support rod 17, but in this case also, since the lightning impulse flashover voltage does not decrease so much due to the bundle conductor effect described above, there is a practical problem. There is no. On the other hand, the discharge part
Since the weight of 18 is reduced, the bending moment acting on the base end portion of the conductive support rod 15 can be reduced when the discharge portion 18 is cantilevered by the conductive support rod 15 with respect to the wire clamp 5. There is an advantage that the discharge electrode 8 on the voltage applying side can be directly supported by the wire clamp 5 without reinforcing the mounting portion.

Next, another example of the present invention will be described with reference to FIGS.

In this another example, the number of the conductive support rods 17 of the discharge electrode 8 on the charging side is one, and the pair of discharge portions 18 are provided on the support rods 17 in the eighth position.
As shown in the figure, it is attached in a V shape. In this other example, the conductive support rod 17 is one, but two discharge parts are used.
Due to the bundle conductor effect of 18 and one support rod 17, the electric field relaxation action of the discharge part 18 does not decrease so much, but on the other hand, the weight of the entire discharge electrode 8 can be further reduced. Easy to put on.

By the way, the table shows the above-mentioned two embodiments of the present invention and the first embodiment.
-Third comparative example, that is, the first comparative example in which both the support rod 17 and the discharge portion 18 have a large diameter and the discharge electrode 14 on the ground side has a single diameter, the support rod 17 and the discharge portion 18 The second comparative example in which the discharge electrode 14 on the ground side is made thin and the diameter of the discharge electrode 14 on the ground side is small, and further, the support rod 17 and the discharge part 18 are both made large in diameter to make the discharge electrode 14 on the ground side double. It shows the experimental results of the switching impulse flashover voltage characteristics with the third comparative example with a diameter.

As is clear from the experimental results, the switching impulse flashover voltage characteristics of the two embodiments 1 and 2 of the present invention are:
It can be seen that compared to the first to third comparative examples, it does not decrease so much. However, it can be seen that the weight of the discharge electrode 8 is significantly reduced.

The present invention can be embodied as follows.

In the above-mentioned embodiment, the conductive support rod 17 and the discharge part 18 are parallel to each other, but the discharge part 18 is formed in an arc shape protruding toward the discharge electrode 14 on the ground side, or a tension type (not shown). To be applied to the lightning protection device of.

[Effects of the Invention] As described in detail above, the present invention can improve the insulation coordination characteristics with respect to lightning impulses without lowering the flashover voltage characteristics with respect to switching impulses, and further reduce the weight of the discharge side electrode. There is an effect that the discharge electrode can be directly supported on the electric wire clamp or the like without reducing and using a special reinforcing member.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a discharge electrode of a lightning protection horn insulator device embodying the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an enlarged sectional view taken along line AA of FIG. FIG. 4 is a front view showing the entire lightning protection horn insulator device, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a front view of a discharge electrode on a power-supply side showing another example of the present invention. Is a plan view of FIG. 6, FIG. 8 is of FIG.
It is an BB line expanded sectional view. 1 ... Support arm, 3 ... Suspended insulator string as a support insulator, 6 ... Transmission line, 7 ... Mounting plate, 8 ... Discharge electrode on the charging side, 9 ... Mounting adapter, 10 ... Lightning arrester , 13 ...... Lightning protection element, 14 ...... Ground side discharge electrode, 14a ...... Discharge part, 15
…… Conductive support rod, 16 …… Coupling plate, 17 …… Conductive support rod, 18 …… Discharge part, G …… Air discharge gap.

Claims (1)

[Claims] 1. A support insulator (3) for a support arm (1) of a steel tower.
The transmission arm is supported through the support arm (1), the lightning arrester (10) is supported on the support arm (1), and the discharge electrode (8) on the power supply side is connected to and supported by the transmission line, and the lightning arrester (10) is also supported. In a lightning protection horn insulator device in which a ground side discharge electrode (14) is provided at an end portion of the power-supply side discharge electrode (8), one or two conductive support rods ( 17) and a discharge part (18) made of a small-diameter wire attached to the support rod (17), the discharge part (14a) of the ground side discharge electrode (14) is made into a single layer, and both discharge parts ( A lightning protection horn insulator device characterized in that a predetermined air discharge gap (G) is provided between 18a, 14a).