JPH0536323A - Parallel type lightning protective insulator - Google Patents

Abstract

PURPOSE:To secure a weight balance and a wind pressure balance for an ordinary suspension insulator string and a suspension type lightning protective insulator string, and stabilize a pole installation condition. CONSTITUTION:An ordinary suspension insulator string 7 comprising ordinary suspension insulators 6 connected with each other in series and a suspension type lightning protective insulator 8 comprising suspension type lightning protective insulators 8 connected with each other in series are connected with each other in parallel between a connection yoke 5 on the ground side and a connection yoke 10 on the charging side supporting a cable 13, and functions of a weight balance member for taking a weight balance to the suspension type lightning protective insulator string 9 and a wind pressure balance member for taking a wind pressure balance are provided for the ordinary suspension insulator string 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel-type lightning arrester device in which a suspension-insulator series having only an insulating function and a suspension-type lightning-insulator series having a lightning protection function are connected in parallel.

[0002]

2. Description of the Related Art Conventionally, as an electric wire support insulator device for supporting a transmission line, a series or multiple parallel suspension type insulator device used in a suspension tower or a tensile steel tower has been used. Among them, a lightning surge current is discharged to the ground at the time of a lightning stroke to each suspension insulator that constitutes one suspension insulator series of the multiple suspension parallel insulator device, and the continuous current based on the operating voltage generated thereafter is suppressed and cut off. It has been proposed to mount a suspension type lightning arrester that houses a resistance element that prevents a ground fault accident.

Further, in the suspension type lightning arrestor, the resistance element is embedded in the cap portion and the insulation strength of the cap portion is ensured.
The diameter of the cap portion becomes large, and the weight of the suspension type lightning arrestor becomes 3 times or more than the weight of the normal suspension insulator. Therefore, it is necessary to balance the weight of the normal suspension insulator series and the suspension type lightning insulator series. As a countermeasure against this, conventionally, Japanese Patent Application Laid-Open No. 62-1
There is one disclosed in Japanese Patent No. 17221. In this device, a metal balance weight is attached to a cap metal fitting of an ordinary suspension insulator.

As a weight balance measure, the weight of the arc horns on the grounding side and the charging side is controlled to suppress the burnout of the suspension insulator during the surface flashover of the usual suspension insulator series. There is also proposed a structure in which the weight of the horn is larger than that of the horn to balance the weight of the entire insulator device.

[0005]

However, in the former metal balance weight method, when the insulator device is subjected to the action of wind force, the suspension type lightning arrestor series receives wind pressure more than the normal suspension insulator series. Since the area is large, there is a problem in that the insulator device turns around the central axis line passing between the insulator chains, and thus the stability in the column mounting state cannot be ensured. or,
Since the balance weight protrudes to the outside of the cap fitting, the creepage insulator's creepage insulation distance is shortened, the electrical characteristics such as lightning impulse withstand voltage, switching impulse withstand voltage or pollution withstand voltage are reduced, and the labor for attaching the balance weight is reduced. In short, when replacing the suspended insulator, the balance weight becomes an obstacle, and there is a problem that the insulator exchanger cannot be used.

Also in the latter arc horn system, since the wind pressure areas of the normal suspension insulator series and the suspension type lightning arrestor series are different, the insulator device turns about the central axis passing between the insulator series. In addition to the problem of inability to secure stability in the mounted column state, in high voltage systems where the voltage class increases and the suspension porcelain string becomes longer, the imbalance of weight between both porcelain strings becomes noticeable, which is suitable for it. There is a problem that it is difficult to mount an arc horn, and there are restrictions in application, and it is necessary to prepare arc horns having different weights according to the number of connected suspension insulators.

A first object of the present invention is to provide a weight balance between a normal suspension insulator series and a suspension-type lightning arrester series, and to secure a wind pressure balance to stabilize the column state. To provide a type lightning protection insulator device.

A second object of the present invention is that, in addition to the first object, the work of mounting a balance weight or a special arc horn can be made unnecessary, and the work of replacing the insulator can be easily carried out. It is an object of the present invention to provide a parallel type lightning arrester device capable of ensuring electrical characteristics and further improving applicability to changes in voltage class.

[0009]

In order to achieve the first object, the invention according to claim 1 comprises a grounding side connecting yoke connected to a steel tower, and a power supplying side connecting yoke supporting an electric wire. Between the normal suspension insulator series, which is formed by connecting normal suspension insulators in series, and the suspension type lightning arrester series, which is connected in series with a suspension type lightning arrester that houses a resistance element whose voltage-current characteristic is non-linear. In a parallel type lightning arrester device in which and are connected in parallel,
In addition to the normal suspension insulator series, a means is provided for providing a weight balance member for achieving a weight balance with the suspension type lightning arrester series and a wind pressure balance member for achieving a wind pressure balance.

In order to achieve the above-mentioned second object, the invention according to claim 2 provides the weight suspension member and the wind pressure balance member according to claim 1, wherein the individual suspension insulators of the usual suspension insulator series are enlarged. The means to combine the functions is taken.

[0011]

According to the invention described in claim 1, since the weight balance and the wind pressure balance of the normal suspension insulator series and the suspension type lightning arrester series are ensured by taking the above-mentioned means, the vibration or the wind pressure of the electric wire is insulated. However, the normal suspension insulator series and the suspension type lightning arrester series do not rotate around the central axis line passing between the two insulator series, and the column state is stabilized.

Further, in the invention according to claim 2, since the usual suspension insulator itself is enlarged, in addition to the operation of the invention according to claim 1, the work of mounting a balance weight or a special arc horn is unnecessary. In addition, the normal suspension insulator replacement work can be easily performed, the creeping insulation distance of the insulator can be secured, electrical characteristics can be secured, and the applicability to changes in the voltage class can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a mounting bracket 2 is fixed to a support arm 1 of a steel tower with bolts, and a U-clevis link 3 is rotatably supported on the mounting bracket 2. Also, this U clevis 3 has a parallel clevis link 4
A grounding side connecting yoke 5 is horizontally connected and supported at the center of the lower end of the link 4.

At the left end of the connecting yoke 5, a suspension insulator string 7 having an insulating function is connected and suspended by connecting a plurality of normal suspension insulators 6 in series. At the right end of the connecting yoke 5, an upper end of a suspension type lightning arrester insulator 9 in which a suspension type lightning arrester 8 is connected in series is connected and suspended via a connecting link 18. The left and right end portions of the connecting yoke 10 on the voltage applying side are connected to the lower end portions of the insulator chains 7 and 9. A connecting link 11 is connected to the center of the connecting yoke 10, and a transmission line 13 is supported at the lower end of the link 11 via an electric wire clamp 12.

The connecting yokes 5 and 1 on the grounding side and the charging side
At the left end portion of 0, arc horns 14 and 15 are supported to reduce the burning damage of the suspension insulator series 7 during a surface flashover. In addition, arc horns 16 and 17 are supported at the right end portions of the two connecting yokes 5 and 10 for suppressing burnout of the suspension type lightning arrester series 9 during a surface flashover.

As shown in FIG. 2, the suspension type lightning protection insulator 8 has an insulator body 21, a cap metal fitting 22 fitted and fixed to the head of the body 21, and inserted and fixed to the inside of the head of the insulator body 21. The pin metal member 23 and a resistance element 25 having a non-linear voltage-current characteristic housed in a mounting cylinder portion 24 formed integrally with the cap portion of the insulator body 21. The upper and lower ends of the mounting cylinder 24 are cap electrodes 2
The cap electrodes 26 and 27 are connected to the cap fitting 22 and the pin fitting 23 by lead wires 28 and 29, respectively. The cap fitting 22
In the unlikely event that the resistance element 25 becomes conductive, the mounting tube portion 24
After the arc emitted from the inside to the outside is transferred to the outside of the insulator main body 21, it is transferred between the arc horns 16 and 17 to provide an arc guide 30 for preventing burnout of the suspension type lightning protection insulator string 9. Has been.

The weight of each suspension insulator 6 of the normal suspension insulator series 7 shown in FIG. 1 is larger than the rated suspension insulator used in the applicable voltage class, and the normal suspension insulator series 7 is used.
It is set so that the total weight and the weight of the suspension type lightning arrester insulator 9 as a whole are balanced. Further, the areas for receiving the wind pressure (hereinafter referred to as the wind receiving area) of the normal suspension insulator series 7 and the suspension type lightning arrester series 9 are equal to each other, and the wind pressure balancing function is set to be exerted.

Next, the operation of the parallel type lightning arrester device constructed as described above will be described. Now, when a surge current due to a lightning strike enters the power transmission line 13, this current passes through the wire clamp 12, the connection link 11, and the charging side connection yoke 10, and is located at the lowest end of the suspension type lightning protection insulator series 9. Pin metal fitting 23, lead wire 29, cap electrode 2
7, resistance element 25, cap electrode 26, lead wire 28,
It flows in the order of the cap metal fitting 22 and then to the lightning protection insulator 8 immediately above, and then sequentially through the suspension insulator 8 and then through the grounding side connecting yoke 5, the parallel clevis link 4, the U clevis link 3, the mounting metal fitting 2 and the support arm 1. It is discharged to the ground. or,
The follow-up current based on the operating voltage following the lightning surge current is
The resistance value of the resistance element 25 is restored and restored so that it is suppressed and cut off.
Ground faults are prevented.

In the embodiment of the present invention, the weight balance and the wind pressure balance of the normal suspension insulator series 7 and the suspension type lightning arrestor series 9 are set to be the same, so that both insulator series 7,
Even when the power transmission line 13 oscillates in the horizontal direction due to wind pressure or the like, the swiveling motion and horizontal direction of the two insulator links 7, 9 around the central axis of the insulator device passing through the parallel clevis link 4 and the connecting link 11 The unbalanced swinging movement of the insulator device is suppressed and the entire insulator device is stabilized. Further, even when wind pressure acts on both the insulator chains 7 and 9 when the power transmission line 13 is stopped, the wind receiving areas of both insulator chains 7 and 9 are the same, so that both the insulator circles 7 and 9 have the same wind receiving area. It is possible to suppress the insulator chains 7 and 9 from turning and to stabilize the column mounting state.

Also, in this embodiment, the size of the suspension insulator 6 itself forming the normal suspension insulator string 7 is made larger than the size of the rated suspension insulator used in the voltage class in which the suspension insulator 6 itself is formed. Since weight balance and wind pressure balance are provided between the and 9, the balance weight and the arc horn need not be mounted differently from the conventional one, and the creepage insulation distance of the insulator string 7 is sufficient. It is possible to improve the electrical characteristics such as lightning impulse withstand voltage characteristics by ensuring that the suspension insulator 6 by the insulator exchanger.
Can be easily replaced.

Next, a 66 kV electric line will be described as a concrete application example. As shown in Table 1, 1 in Area A
Applying two 2 ton lightning insulators, connecting length 925mm, weight 1
It becomes 00 kg. Also, in Area B, 1071m each
m, 120 kg. On the other hand, the connection length, weight, and electrical characteristics were examined when using conventional suspension insulators such as 21 tons and 33 tons.

[0022]

[Table 1]

As is clear from Table 1, in the area A, by using five 33 ton fog insulators and the connecting metal fittings 34, the weight balance without impairing the lightning impulse withstand voltage and pollution characteristics is achieved. It turns out that can be secured. In addition, Zo in Table 1 is the length (mm) of the insulator, L
Indicates the length (mm) of the mounting bracket, and Lo indicates (Zo + L) indicating the length (mm) of the insulator device.

Next, another embodiment of the present invention will be described with reference to FIGS. Another example shown in FIG. 3 is embodied in a tension-type electric wire support insulator device, and also serves as a weight balance and an air pressure balance made of an insulating material for the cap fitting 22 of the insulator 6 which normally forms the suspension insulator series 7. The balance member 31 is attached.

In another example shown in FIG. 4, a balance weight 32 made of metal is attached to the cap fitting 22 of the suspension insulator 6, and a wind pressure balance member 33 is fitted to the outside of the balance weight 32.

In the above two different examples, since the wind-receiving areas of the normal suspension insulator series 7 and the suspension-type lightning arrester series 9 are the same, both suspension insulator series 7 and 9 have the central axis O even when subjected to wind pressure. There is no turning around.

[0027]

As described above in detail, according to the invention of claim 1, the weight balance between the normal suspension insulator series and the suspension type lightning arrester series can be ensured, and the wind pressure balance can be ensured, and the column can be mounted. It has the effect of stabilizing the state.

In addition to the effect of the invention of claim 1, the invention of claim 2 can eliminate the work of mounting a balance weight or a special arc horn, and can easily replace the insulator. By doing so, there is an effect that electrical characteristics can be secured and applicability to changes in the voltage class can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a lightning arrester device showing an embodiment embodying the present invention.

FIG. 2 is a semi-longitudinal sectional view of a suspension type lightning protection insulator.

FIG. 3 is a plan view showing another embodiment of the present invention.

FIG. 4 is a plan view showing another embodiment of the present invention.

[Explanation of reference numerals] 5 grounding side connecting yoke, 6 normal suspension insulator, 7 normal suspension insulator string, 8 suspension type lightning arrestor string, 9 suspension type lightning insulator string, 10 charging side connecting yoke, 25 resistance element, 31
Balance member, 32 balance weight, 33 wind pressure balance member.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masamichi Ishihara             No. 2354, Katsutata, Saori-cho, Kaifu-gun, Aichi             63 of the ground (72) Inventor Shinji Yoshida             Inuyama City, Aichi Prefecture             11

Claims (2)

[Claims] 1. A normal suspension insulator string in which a normal suspension insulator is connected in series between a grounding side connection yoke connected to a steel tower and a power supply side connection yoke for supporting an electric wire, and a voltage. -A parallel type lightning arrester device in which a suspension type lightning arrester series formed by connecting in series a suspension type lightning arrester containing a resistance element having a non-linear current characteristic is connected in parallel, with respect to the normal suspension insulator series, A parallel type lightning arrester device comprising a weight balance member for balancing the weight with a suspension type lightning arrester string and a wind pressure balancing member for balancing the wind pressure. 2. A parallel-type lightning arrester device according to claim 1, wherein the individual suspension insulators of the normal suspension insulator series are made large in size and have the functions of both a weight balance member and a wind pressure balance member.