JPH0766702B2 - Lightning arrester device - Google Patents

Description

The present invention relates to a power line-like lightning arrester device.

[Conventional technology]

Conventionally, as shown in FIG. 6, mounting a lightning arrester device using a suspension type lightning arrester 9 having a current limiting element having a non-linear voltage-current characteristic in the suspension insulator on a support arm 1 of a steel tower. Is proposed. This device is a suspension type lightning arrester 9
If multiple lightning surge currents flow through the transmission line 18 by connecting a large number of them in series, the current is limited by the current limiting device
It discharges to the (ground) side, and the subsequent current that follows is suppressed and blocked by a current limiting element to prevent a ground fault.

[Problems to be Solved by the Invention]

However, the above-mentioned conventional lightning arrester device has a technical problem that the current limiting element deteriorates due to long-term use or is destroyed by an unexpected lightning strike and becomes a permanent ground fault when it becomes conductive. Various devices have been proposed to solve this problem. For example, in a device in which a discharge gap is provided between each lightning protection insulator 9, it is not possible to make the discharge gap so large. Therefore, the lightning protection element in the lightning protection insulator 9 is lengthened or the number of lightning protection insulators 9 is increased. There is a need to. Further, the device that mechanically or electrically separates the lightning protection insulator 9 from the electric line has a problem that the device becomes complicated.

Further, in a lightning arrester device in which the lightning protection insulator 9 having a current limiting element built-in is connected in series in the cap portion and having no air discharge gap, in the lightning protection insulator device that is normally incorporated in the lightning protection insulator 9, In order to reduce the leakage current flowing through the element 8, the required length of the current limiting element 8 (the length of the lightning protection insulator series) cannot be shortened. In addition, the lightning protection insulator has a large cap diameter in order to make the surface leakage distance equal to that of an insulator that does not have a lightning protection function. It is necessary to secure the surface leak distance by using the lightning protection insulator 9 which is made larger. Therefore, there is a problem that the device becomes large and it cannot be applied to an existing steel tower where the insulator string cannot be long.

An object of the present invention is to reliably prevent permanent ground fault even when the current limiting element is deteriorated or destroyed and is brought into a conductive state, and the device is small in size and lightweight with respect to an existing steel tower. It is to provide a lightning protection insulator device having a wide range of application.

[Means for achieving the task]

In order to achieve the above object, the present invention provides, in the invention of claim 1, a first insulator series constituted by vertically connecting a lightning protection insulator part 34 having a lightning protection function and an insulator part 35 not having a lightning protection function. A and the first insulator series A are the second insulator series B in which the arrangement order of the insulator portion 35 and the lightning protection insulator portion 34 is reversed.
And a pair of discharge electrodes 36, 37 facing each other at the lower part of the lightning protection insulator part 34 of the first insulator series A and the upper part of the lightning protection insulator part 34 of the second insulator series B. Place and discharge both electrodes 36,37
The means is that an air discharge gap Z is provided between them.

Further, in the invention of claim 2, lightning protection insulator portion 34 and insulator portion
A first insulator series A constituted by connecting a plurality of sets in series with 35 as a set and a series in which the lightning protection insulator section 34 and the insulator section 35 are arranged in the reverse order. A plurality of second insulator series B, which are constituted by connecting a plurality of sets in series as one set of connections, are arranged in parallel, and the upper and lower end portions of each lightning protection insulator portion 34 of the first insulator series A and the second insulator are also provided. A pair of discharge electrodes 36 and 37 are arranged at the upper and lower ends of the lightning arrester portion 34 of the series B, respectively, and the air discharge gap Z1, between the discharge electrodes 36 and 37 of the lightning insulator portions of other insulator series adjacent to each other. The means of providing Z2 and Z3 is adopted.

[Action]

In the invention of claim 1, an insulator portion 35 is connected in series to each of the first and second insulator series A and B, and the lightning protection insulator portion 34 and the first insulator series A of the second insulator B are connected. Since the air discharge gap Z is provided between the lightning protection insulator parts 34, when the current limiting element 8 built in the lightning protection insulator part 34 is deteriorated or destroyed, a permanent ground fault is prevented, Power can be retransmitted.

In addition, the second insulator string B is made up of the first insulator string A and the insulator portion 35.
And the lightning protection insulator portion 34 are arranged in reverse order, and the air discharge gap is formed in the lower part of the lightning protection insulator portion 34 of the first insulator series A and in the upper part of the lightning protection insulator portion 34 of the second insulator series B. Since the discharge electrodes are arranged opposite to each other with Z, the number of lightning protection insulators 9 required for interrupting the follow-up current following the lightning surge current is set to the number of the two pairs of insulators A and B.
Therefore, it is not necessary to lengthen the insulator series of both the first and second insulator series A and B.

In addition, the lightning protection insulator part 34 of the second insulator series B and the first insulator series A
Since the air discharge gap Z is provided between the lightning protection insulator parts 34, the leakage current does not flow in the current limiting element 8 built in the lightning protection insulator part 34 against normal voltage application. The length of the current limiting element 8 can be shortened, so that the lightning protection insulator portion 34 and the length of the insulator series A and B can be shortened.

In the invention of claim 2, the first insulator A is constituted by connecting a plurality of sets of the lightning protection insulator part 34 and the insulator part 35 in series, and the second insulator series B is the first. Insulator series A, the lightning protection insulator part 34 and the insulator part 35 are connected in series, and a plurality of sets are connected in series.
A pair of discharge electrodes 36 and 37 are arranged at the upper and lower ends of the lightning protection insulator portion 34 of the first insulator series A and at the upper and lower ends of the lightning protection insulator portion 34 of the second insulator series B, respectively. In-air discharge gap Z1, Z between both discharge electrodes 36, 37 of the lightning insulator part of the insulator series
Since Z2 and Z3 are provided, a plurality of air discharge gaps can be provided. Therefore, the mounting distance between the first and second insulator series A and B can be narrowed, and the device can be downsized.

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a U clevis 2 is clamped and fixed to a support arm 1 of a steel tower by a connecting pin 3, and a clevis link 4 is supported on the U clevis 2 so as to be orthogonal to the U clevis 2. Clevis link 4 has connecting pin 5
The upper connecting yoke 6 made of a plate is supported substantially horizontally via the. First and second insulator series A and B, which are suspension insulators as supporting insulators, are rotatably distributed and supported on both left and right sides of the connecting yoke 6 via connecting pins 7. These two insulator series A and B are a lightning arrester 9 having a lightning protection function by incorporating a current limiting element 8 (see FIG. 2) having a non-linear voltage-current characteristic in the insulator, and a suspension lightning suspension having no lightning protection function. An insulator (insulator) 10 as an insulator is connected to each other.

The connecting links 11 and 11 are supported at the lower ends of the first and second insulator chains A and B via connecting pins (not shown), and the connecting pins 11 and 11 have connecting pins 12 and 11, respectively. The lower connecting yoke 13 is supported via 12, the connecting link 15 is supported on the connecting yoke 13 via the connecting pin 14, and the electric wire clamp 17 is supported on the connecting link 15 via the connecting pin 16. The electric power line 18 is suspended and supported by the electric wire clamp 17.

Further, on both sides of the upper and lower connecting yokes 6 and 13, the upper arc horns 19 and 19 on the grounding side and the charging side of the first side and the second side of the insulator series A and B for preventing the surface flashover are prevented. The lower arc horns 20 and 20 are attached by mounting bolts 21 and 21, respectively.

Next, the lightning protection insulator 9 and the insulator 10 applied to the above-described first and second insulator series A and B will be described with reference to FIG.

Insulators used in the first and second insulator series A, B 1
Reference numeral 0 denotes a deep pleat-shaped fouling-resistant insulator, which is formed by fitting and fixing a cap metal fitting 33 to the head of an insulator main body 31 having a cap portion 32 with cement.

Further, the lightning protection insulator 9 is a stain-resistant insulator, and deep pleats are formed on the lower surface side of the cap portion of the insulator main body 22 and the cap diameter is increased to provide a required surface leakage distance and prevent the contamination resistance of the insulator 10. It is almost equal to the voltage characteristic. Insulator body of lightning protection insulator 9
A cap metal fitting 23 is fitted and fixed to the head of 22 by cement, and a pin metal fitting 24 is fitted and fixed to the inside of the cap metal fitting 23 by cement. Inside the plurality of mounting heads 25 formed integrally with the cap portion of the insulator main body 22, the current limiting element 8 having a non-linear voltage-current characteristic mainly composed of a zinc oxide element is housed, and the upper cap electrode 26 and Lower cap electrode 27
The crown is fixed by.

If the current limiting element 8 is deteriorated or destroyed on the outer circumference of the cap fitting 23 and becomes conductive, an arc deflector 28 for guiding the arc outward and preventing the insulator main body 22 from being destroyed.
Is fixed horizontally, the upper cap electrode 26 and the arc deflection plate
28 is electrically connected by a lead wire 29, and the lower cap electrode 27 and the pin fitting 24 are electrically connected by a lead wire 30 to a cap fitting 23 or a cap fitting 33 located below.

Now, as shown in FIG. 1, in the first insulator string A hung on the left side of the upper connecting yoke 6, two lightning insulators 9 having a lightning protection function are connected in series via a connecting pin 7. The lightning protection insulator portion 34 is formed. Then, three insulators 10 having no lightning protection function are connected in series to the lower portion of the insulator portion.
Forming 35. Further, the discharge electrode 36 extending to the second insulator B side is connected to the cap electrode 27 below the lightning insulator 9 arranged below the lightning insulator portion 34.

Further, the second insulator string B hung on the right side of the upper connecting yoke 6 is an insulator 10 which is hung on the first insulator string A.
Insulators 10 having the same rating as above are connected in series via connecting pins 7 to form an insulator part 35. And, in the lower part thereof, a lightning protection insulator 9 suspended from the first insulator series A.
And two lightning protection insulators 9 of the same rating having substantially the same operating start voltage and other characteristics are connected in series to form a lightning protection insulator portion 34. A discharge electrode 37 extending to the first insulator series A side is connected to the cap electrode 26 on the upper portion of the lightning arrester insulator 9 arranged in the lightning insulator portion 34. The discharge electrode 36 is disposed so as to face the discharge electrode 36 attached to the first insulator string A side with an air discharge gap Z therebetween.

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

In the lightning arrester device of the first embodiment, the dielectric strength is ensured by the two lightning insulators 9 and the three insulators 10 against a normal voltage application.

When a lightning surge current is applied to the transmission line 18 due to a lightning stroke, this current passes from the wire clamp 17, the connecting link 15, and the connecting yoke 13 to the connecting link 11 on the side of the second insulator B, and the lightning arresters 9, 9 are connected. Flowing through the current limiting elements 8 and 8 of the discharge electrode 37 and flashing over the air discharge gap Z from the discharge electrode 37.
Flow to the discharge electrode 36 on the side, and then from the current limiting element 8, 8 of the lightning protection insulator 9, 9 to the connecting pin 7, the connecting yoke 6, the clevis link 4,
It flows from the U clevis 2 to the steel tower through the support arm 1 and is discharged to the ground. Subsequent flow of the operating voltage generated thereafter is due to the four current limiting elements 8 built in the two lightning protection insulators 9 arranged in the first insulator series A and the second insulator series B and the air discharge. The current is cut off by the gap Z.

Even when the lightning surge current flows, the operating voltage is applied to the first insulator series A and the second insulator series B, but since this time is short, there are two lightning arresters for each of the insulator series A and the insulator series B. Insulator 9
With a total of four lightning protection insulators 9, a sufficient dielectric strength is secured.

Since the air discharge gap Z is formed between the discharge electrode 37 of the second insulator series B and the discharge electrode 36 of the first insulator series A, the first and second insulator series A and B are formed. It is possible to secure a sufficient air discharge gap Z between the two discharge electrodes 36, 37 without increasing the length.

Further, when the current limiting element 8 of the lightning protection insulator 9 is deteriorated or destroyed and is brought into an energized state, the lightning protection insulator part 34 is connected in series to the insulator part 35, and the air discharge gap Z is provided. Therefore, it is possible to prevent permanent ground fault and enable re-power transmission.

As shown in FIG. 3 (a), the discharge electrodes 36, 37 of the first embodiment are rod-shaped ones having the first and second insulator series A, B.
However, as shown in FIG. 3B, the tip ends of the discharge electrodes 36b and 37b may be formed in a ring shape. In the discharge electrodes 36b and 37b, corona generation can be prevented by relaxing the electric field. Also, as shown in FIG. 3 (c),
The tip may be bent toward the first and second insulator series A and B of each other. The discharge electrodes 36c, 37c can have a large discharge gap Z even when the first and second insulator series A, B are hung close to each other. further,
As shown in FIG. 3 (d), it is also possible to extend in parallel, bend the tips toward the first and second insulator series A and B of each other, and form the tips in a ring shape. This discharge electrode 36
With d and 37d, a large discharge gap Z can be provided even when the first and second insulator series A and B are suspended close to each other, and corona generation can be prevented by electric field relaxation. .

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. 4. The second embodiment is a case of a lightning arrester device in a transmission line having a higher transmission voltage than that of the first embodiment. 1. A lightning insulator 9 and an insulator 10 having the same rated capacity as those of No. 1 are used, and a first insulator series A on the left side and a second insulator series B on the right side are suspended and juxtaposed on an upper connecting yoke 6. There is. First insulator series A
Is different from the first insulator series A of the first embodiment in that a lightning insulator portion 34 formed of two or more lightning insulators 9 is connected in series with an insulator portion 35 formed of three or more insulators 10 below. A first insulator string A and a second insulator string B are suspended from an upper connecting yoke 6 and arranged in parallel. Further, the cap electrode 27 (see FIG. 2) below the lightning protection insulator 9 arranged at the lower end of the lightning protection insulator portion 34 has a discharge electrode 36 extending to the second insulator series B side.
Is connected to the cap electrode 26 above the lightning protection insulator 9 arranged at the upper end of the lightning protection insulator portion 34.
The discharge electrode 37 extended to the side is connected. And
The discharge electrode 37 is arranged so as to face the discharge electrode 36 attached to the first insulator A side with an air discharge gap Z therebetween. Therefore, in the device of the second embodiment, one air discharge gap Z is provided as in the first embodiment.

In the device of the second embodiment, the device of the first embodiment is applied by appropriately increasing the number of lightning protection insulators 9 forming the lightning protection insulator part 34 and the number of insulators 10 forming the insulator part 35. The device can be applied to an electric wire having an applied voltage higher than the applied voltage.

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

The third embodiment shows another lightning protection device in a transmission line having a higher transmission voltage than that of the first embodiment as in the second embodiment, and uses the lightning protection insulator 9 and the insulator 10 having the same rated capacity as the first embodiment. The first insulator series A on the left side and the second insulator connecting yoke B on the right side are suspended from the upper connecting yoke 6 and arranged in parallel. The first insulator series A is different from the first insulator series A of the first embodiment in that the lightning protection insulator portion 34 is composed of two or more lightning protection insulators 9.
Is connected in series with a lower portion of the insulator portion (35) composed of three or more insulators (10), and two pairs of these are connected in series. Further, the second insulator series B is the same as in the first embodiment.
Similarly to the second insulator series B, the first insulator series A and the lightning protection insulator section 34 and the insulator section 35 are reversed in the order below the insulator section 35 composed of three or more insulators 10. A lightning arrester portion 34 composed of two or more lightning protection insulators 9 is connected in series, and two lightning arrester portions 34 are connected in series.

In addition, the lightning protection insulators 9, 9 at the upper and lower ends of the lightning protection insulator portion 34 of the first insulator series A, and the lightning protection insulators 9, 9 at the upper and lower ends of the lightning protection insulator portion 34 of the second insulator series B have discharge electrodes 36, 9. 37 is provided, and the air discharge gaps Z1, Z2, Z3 are formed between the discharge electrodes of another insulator series that are close to each other.

Therefore, in the device of the third embodiment, the air discharge gap Z is the total of the air discharge gaps Z1, Z2, Z3, and it is easy to take a large value. Further, the electric field concentration on each discharge electrode is alleviated and the occurrence of electric field corona is prevented.

〔The invention's effect〕

As described in detail above, according to the present invention, since the lightning protection insulator part having the lightning protection function and the insulator part not having the lightning protection function are connected in series to form the insulator string, the current limiting element is deteriorated or destroyed. Even in the case of being brought into conduction, the permanent ground fault can be surely prevented. In addition, a series of insulators with the insulator and lightning protection insulators arranged in reverse order is installed side by side, and there is an air discharge gap between the lower part of one lightning protection insulator and the upper part of the lightning protection insulator of the other insulator series. By arranging the discharge electrodes so as to face each other, it is possible to provide a lightning protection insulator device which has a wide range of application to the existing insulator device, because the device applied to an area where there is contamination is small and lightweight.

[Brief description of drawings]

1 to 3 (a) show Embodiment 1 of the present invention, FIG. 1 is a front view, FIG. 2 is a partial sectional view, and FIG. 3 (a) is a plan view of a discharge electrode. 3 (b) to 3 (d) are plan views showing another example of the discharge electrode, FIG. 4 is a front view showing the second embodiment, FIG. 5 is a front view showing the third embodiment, and FIG. It is a front view which shows an example. 8: Current limiting element, 9: Lightning arrester, 10: Insulator, 34
...... Lightning protection insulator part, 35 ...... Insulator part, 36 ...... Discharge electrode,
37 ... Discharge electrode, A ... First insulator string, B ... Second insulator string, Z ... Air discharge gap

Claims (2)

[Claims] 1. A first insulator string (A) constituted by vertically connecting a lightning protection insulator part (34) having a lightning protection function and an insulator part (35) having no lightning protection function, and the first The insulator string (A) is provided with a second insulator string (B) in which the insulating insulator part (35) and the lightning protection insulator part (34) are arranged in reverse order.
A lower portion of the lightning protection insulator portion (34) of the first insulator string (A),
A pair of discharge electrodes (36, 37) are arranged facing each other above the lightning protection insulator portion (34) of the second insulator string (B), and an air discharge is generated between the discharge electrodes (36, 37). A lightning protection insulator device characterized in that a gap (Z) is provided. 2. A first insulator string (A) constituted by a plurality of series connection of the lightning protection insulator part (34) and the insulator part (35) as a set, and the insulator string (A). ) Means a second insulator string (B) formed by connecting a plurality of series connection in which the lightning protection insulator part (34) and the insulator part (35) are connected in series in a reverse order. A pair of lightning protection insulator parts (34) of the first insulator series (A) and upper and lower ends of the lightning protection insulator part (34) of the second insulator series (B). Discharge electrodes (36, 37) are arranged, and air discharge gaps (Z1, Z2, Z3) are provided between the discharge electrodes (36, 37) of the lightning insulator parts of other insulator series that are close to each other. Lightning arrester device.