JPH0319646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a lightning arrester device for overhead power transmission lines equipped with an insulation recovery function. More specifically, an overhead transmission line that combines a part that shares the hanging load of an overhead power transmission line, a part that has a lightning protection function that absorbs abnormally high voltage caused by lightning, and a function that restores insulation from the conduction state of abnormal discharge. This invention relates to a lightning arrester device for power transmission lines.

(Prior Art) Generally, in a lightning arrester using a zinc oxide element, when an abnormal discharge occurs due to deterioration of the element or an unexpected large-scale lightning strike, the current-carrying side and the ground terminal become electrically connected. As a result, the overhead power transmission line becomes in a ground fault condition, making it difficult to continue power transmission. In order to prevent the occurrence of such abnormal conditions, a method is proposed in which the energized side of the lightning arrester is physically separated using the passing current as a trigger, and the necessary insulation clearance is secured by falling (displacement) due to gravity (Japanese Patent Application Laid-Open No. 1983-1999). 138202) has been proposed.

(Problems to be Solved by the Invention) However, this lightning arrester, for example for 500KV, has about 2 to 4 lightning arresters connected and weighs about 1 ton, so it is difficult to disconnect it quickly. In addition, if the lightning arrester or overhead power transmission line hanging insulator device shakes sideways due to strong winds after being disconnected, it will be difficult to secure the required insulation clearance between the two due to the specifications of the steel tower, and furthermore, it will be difficult to prevent the shock caused by the disconnection. There were problems such as the force caused by vibrations could not be ignored due to the strength of the steel tower, and reinforcement was required.

The present invention has been made in order to solve the above problems, and its purpose is to quickly restore the insulation after an abnormal discharge occurs in the lightning arrester, making it possible to retransmit power, and to restore the insulation. To provide a lightning arrester device for an overhead power transmission line having an insulation recovery function that eliminates the need for reinforcement without applying extra force to a steel tower, and further improves operational reliability regarding mechanical strength. It is in.

Structure of the Invention (Means for Solving Problems) In order to achieve the above object, the present invention provides a plurality of tensile insulator chains that mainly share the hanging load of an overhead power transmission line, a lightning arrester having a lightning protection function, and an abnormality. A lightning arrester series, which is formed by connecting insulator series for insulating parts in series, is combined in parallel, and an overhead power transmission line is suspended from the energized side end of the tension insulator series and the lightning arrester series. A pair of rupture mechanisms are installed at both ends of the insulating insulator series constituting the lightning arrester series, and are ruptured in response to a follow-on current after the lightning arrester becomes conductive due to an abnormal discharge. A configuration is adopted in which the breaker is attached via a mounting bracket and a bypass conductor is installed between both rupture mechanisms.

(Function) When the lightning arrester device for an overhead power transmission line of the present invention is installed between a steel tower and a power transmission line, the suspension load of the overhead power transmission line is mainly received by the tension insulator chain, so that the lightning arrester device of the present invention is installed between a tower and a power transmission line. The suspension load acting on the lightning arrester series is reduced, and the mechanical strength of the lightning arrester series is reduced to the necessary minimum. Furthermore, since the tension insulator series and the lightning arrester series are combined in parallel via a connecting mechanism, there is only one column installation space, making it easier to perform the erection work.

When an abnormal discharge occurs in the lightning protection insulator chain and a follow-on current flows to the side conductor that has electrically shorted the insulator chain for insulation, the rupture mechanism operates to cut off the side conductor and disconnect the main body of the ground insulation. Transferred to the insulators. Both ends of the insulator chain for insulation are connected by an arc by the operation of the breaking mechanism. This condition is a ground fault phenomenon, so
The substation functionality senses this and the circuit breaker releases the line, thus extinguishing the arc, and when it is re-energized after a certain period of time, power transmission continues. Since the lightning arrester system does not undergo mechanical disconnection of itself, the insulation is quickly restored and no extra forces are applied to the tower.
There is no need to reinforce the steel tower.

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

Figures 1 and 2 show an outline of a lightning arrester device for overhead power transmission lines, and one end of a pair of tension insulator chains 3 and 4 parallel to each other is located on either the left or right side of the arm 2 of the steel tower 1. is hooked, and one end of a lightning arrester string 5 disposed between both tension insulator strings 3 and 4 is hooked. In addition, each of these three tensile strength and lightning protection insulators 3
Two overhead power transmission lines 7 are suspended from the other ends of 5 to 5 via a connecting mechanism 6. Furthermore, the overhead power transmission line 7 is connected by a jumper wire 8.

Since the pair of tension insulators 3 and 4 are constructed in substantially the same way, only one tension insulator 3 will be explained with reference to FIGS. 3 and 4, and the other tension insulator 4 will be explained. , the explanation will be omitted by adding '' to the symbol.
One end of a group of articulated links 9 that allows swinging in any direction is connected to the arm 2, and one end of a first suspension insulator chain 10 is connected to the other end of the link group 9. Further, one end of a second suspension insulator chain 12 is connected to the other end of the first suspension insulator chain 10 via a connecting fitting 11 so as to be rotatable only in the vertical direction. Further, the other end of the second suspension insulator chain 12 is connected to a connecting metal fitting 1.
3 and a pin 14 to a connecting mechanism 6, which will be described later.

On the other hand, the first suspension insulator chain 1 of the articulated link group 9
Arching horns 15 and 16 are attached to the zero position and the connecting fitting 11. Furthermore, an arcing horn 17, which faces the arcing horns 15, 15', is installed between the connecting fittings 11, 11' of the pair of tension insulator devices 3, 4. Similarly, the arcing horns 1 facing the arcing horns 16, 16' are also connected to the connecting fittings 13, 13'.
8 has been constructed.

Next, the structure of the lightning arrester chain 5 will be explained based on FIGS. 3 and 5. It should be noted that members having the same functions as the members of the tensile insulator chain 3 will be used with "" attached to the reference numerals.

An insulator 19 is connected to the end of the articulated link group 9'', and one end of a suspended insulator chain 21 is connected to the insulator 19 via a connecting fitting 20 as an insulator chain for insulation sharing, which has an insulation sharing function in the event of an abnormality. The other end of the suspension insulator chain 21 is connected in series with a lightning arrester 22 which functions as a lightning arrester and also has a normal insulation function. connected. This lightning arrester 22 is the fifth
As shown in the figure, a cylindrical insulator tube 23, a zinc oxide element 24 having a lightning protection function housed inside the insulator tube 23, end fittings 25 fitted and fixed to both ends of the insulator tube 23, and the It is composed of a zinc oxide element 24 and a connecting fitting 26 that connects an end fitting 25.

Further, a lightning arrester 22' similar to the lightning arrester 22 is connected to the lightning arrester 22 via a connecting fitting 27, and the ends of the lightning arrester 22' are connected via connecting links 28, 29 and a pin 30. It is connected to mechanism 6. (See FIG. 6) Here, the arcing horn 18 is configured to have an electric field relaxation function to prevent potential concentration and damage to the zinc oxide element provided near the energized side.

On the other hand, the connecting fittings 11'' and 20 have rupture mechanisms 31 and 32 that do not operate under lightning current but respond to follow-on current.
is attached, and a side path conductor 33 is installed in parallel between the upper ends of both the breaking mechanisms 31 and 32. These rupture mechanisms 31 and 32 can be implemented, for example, by adding explosives to the rupture mechanism's container using the trailing current as a trigger to explode and destroy the container of the rupturing mechanism, and scattering the bypass conductor 33; There is also a method in which the container is stretched inside the container and the internal pressure rise due to the arc causes the container to be destroyed.

Arcing horns 34,
35, 34', 35' are installed, and lightning arrester 2
If the surfaces of 2 and 22' are abnormally contaminated or caused by a large-scale lightning strike, the generated arc is immediately moved away from the insulator to prevent damage.

By the way, in this embodiment, the tensile insulator chains 3 and 4 are divided into two by the connecting fittings 11 and 11' at the portion corresponding to the connecting fitting 11'' of the lightning arrester string 5, and each connecting fitting 11, 11', 11'' are electrically connected by lead wires 36 and 37, so that the potentials between the respective connecting fittings (connecting points) are the same. In this case, the first
and the second suspension insulator series 12, 1 located on the power supply side among the second suspension insulator series 10, 10'12, 12'.
2' is the state in which the lightning arresters 22, 22' are functioning normally, and the first suspension insulator series 10, 1 on the grounding side.
0' will each bear the ground voltage after abnormal discharge. Therefore, each insulator series 10, 10', 1
2 and 12' are required to have the same insulation strength as an insulator device for an overhead power transmission line commonly used.

Next, as shown in FIGS. 3 and 6, the connecting mechanism 6
I will explain about it.

This connecting mechanism 6 connects the overhead power transmission line 7 to the clamp fitting 3.
8 and the pins 14 and 30, between the pins 14' and 30
A pair of interlocking yokes 39, 40 are rotatably connected between them, and pins 41, 42, 43, 4 are connected to the retaining fitting 38 and the interlocking yokes 39, 40.
A pair of connecting links 45, 4 connected via 4
6. Moreover, the pin 14
(14') and pin 42 (44) is L1, and the distance between pin 42 (44) and pin 30 is L2.
In this case, since it is necessary to set the tensile load low for the tensile insulator chains 3 and 4, L2>2L1 becomes the target. With this configuration, each suspension insulator chain 12, 12' has an interlocking yoke 39, 40.
The insulator is always maintained in a balanced state, absorbing expansion and contraction caused by lateral vibration and thermal expansion.
No abnormal load is applied to 2 and 12'. Furthermore, by selecting the intervals L1 and L2, the tensile load applied to the lightning arrester chain 5 can be set arbitrarily.

In addition, in the conventional insulator device for overhead power transmission lines, in order to equalize the tensile load of each tension insulator chain, L2=
It is set to 2L1.

As shown in FIG. 6, the interlocking yokes 39, 4
At the end of the pin 30 of 0, there is a screw that interferes with the connecting link 29 to restrict the rotation angle of the interlocking yokes 39 and 40 in the directions of arrows P and Q (suppressing abnormal rotation).
Stoppers 47 and 48 are provided in a protruding manner. and,
If the lightning arrester chain 5 were to break off, the tensile load on the insulator chain 5 would be released, so the interlocking yoke 39 would move counterclockwise around the pin 42, and the interlocking yoke 40 would move counterclockwise around the pin 42. The tension insulator chains 3 and 4 are rotated clockwise around the pin 44, and the tension insulator chains 3 and 4 approach each other, but the stoppers 47 and 48 and the connecting link 2
9 stops the rotation of the interlocking yokes 39 and 40, thereby preventing the two insulator chains 3 and 4 from colliding.

Next, the operation of the lightning arrester device for overhead wires constructed as described above will be explained.

Now, due to deterioration of the zinc oxide elements 24, 24' built into the lightning arresters 22, 22' or an unexpected large-scale lightning strike, an abnormal discharge occurs, and the suspension insulators 22, 22'
At the moment when a follow-on current flows through the side conductor 33 that was electrically short-circuited to the side conductor 33, the breaking mechanisms 31 and 32 operate, cutting off the side line conductor 33 and disconnecting the main body of ground insulation from the suspended insulator chain 2.
Move to 1. Both ends of the suspended insulator chain 21 are provided with a breaking mechanism 3.
1 and 32, they are connected by an arc. This arc immediately moves to the arcing horns 15 and 17. Since this condition is a ground fault phenomenon, the function of the substation senses this and opens the line, thereby extinguishing the arc and reinserting the line for a certain period of time to continue power transmission. At this time, 21 suspension insulators
Since the insulation has been restored, no failure will occur.

In addition, since the lightning arrester chain 5 does not mechanically disconnect itself, compared to conventional disconnection methods, the insulation can be restored more quickly and unnecessary force is applied to the tower, eliminating the need for reinforcement. It's over. By introducing lightning protection insulators to overhead power transmission lines in this way, the reliability of the power transmission system has been greatly improved.
Even if a ground fault occurs due to functional deterioration of the lightning arresters 22, 22', power can be retransmitted by turning it on again, and even if this state continues for a long period of time, reliability will not deteriorate.

Furthermore, in the embodiment of the present invention, the interlocking mechanism 6
Interlocking yokes 39, 40 and connecting links 45, 46
By setting the positions of the connection points (pins 42, 44) at appropriate positions, the hanging load of the overhead power transmission line 7 is mainly shared between the tension insulator chains 3 and 4, and the tension acting on the lightning arrester chain 5 is reduced. It can be set low, and
Expansion and contraction of the insulator chains 3 to 5 can be absorbed and tension can be constantly applied. As a result, lightning arrester series 5
The mechanical strength of the device can also be set to the minimum necessary, making it possible to reduce the size and weight, and improve reliability in terms of strength.

In addition, the embodiments of the present invention utilize tension insulator chains 3 and 4 similar to tension insulator devices conventionally used for overhead power transmission lines.
However, since we have adopted a structure in which the lightning arrester chain 5 is installed, there are fewer problems with mounting the tower, such as how to install it on the tower 1 or how to deal with horizontal corners of the railway, and the reliability of mechanical strength is also improved compared to the conventional method. It will be similarly expensive.

Note that the present invention can also be embodied in the following embodiments.

(1) Three or more tension-resistant insulator chains 3 and 4 are provided, and a lightning arrester chain 5 is installed between each insulator chain 3 and 4.

(2) In the above embodiment, the suspension insulator chain 21 is arranged on the steel tower 1 side, and the lightning arrester 22, 2 is arranged on the overhead power transmission line 7 side.
2', but reverse this.

Effects of the Invention As detailed above, according to the present invention, the hanging load of an overhead power transmission line is mainly received by the tension insulator chain, and the hanging load acting on the lightning arrester chain can be reduced, so that the lightning protection The mechanical strength of the insulator chain can be minimized, and since the lightning arrester chain and the tension-resistant insulator chain are combined in parallel via a connecting mechanism, the column installation space is in one place, and the erection work can be done easily. This is easy to do, and when the lightning arrester becomes conductive due to an abnormal discharge, the breaking mechanism operates at the moment a follow-on current flows to the side conductor, cutting off the side conductor, and the insulation insulator chain is disconnected. Since the main body of ground insulation can be transferred immediately, the insulation can be recovered quickly.Furthermore, after that, both ends of the insulator chain for insulation are connected with an arc, and the cutoff function of the substation is activated. It is possible to extinguish the arc by opening the line at a later time, making it possible to retransmit power after that, and unlike the conventional method, it does not involve disconnecting the lightning arrester device, so it is easy to restore the insulation. This has the effect of improving operational reliability by eliminating the need for reinforcement, etc., without applying extra force to the steel tower.

[Brief explanation of drawings]

Fig. 1 is a front view showing a lightning arrester device for overhead power transmission lines according to the present invention installed on a steel tower, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is an enlarged plan view of the lightning insulator device; 4 is an enlarged front view, FIG. 5 is an enlarged front view of the lightning arrester chain, and FIG. 6 is an enlarged plan view of the vicinity of the coupling mechanism. 1... Steel tower, 3, 4... Tension insulator series, 5... Lightning arrester series, 6... Connection mechanism, 10 (12... 1st
(Second) Suspension insulator chain, 11″, 20…connecting fittings,
21... Suspended insulator link as an insulator link for insulation sharing,
22, 22'... Lightning arrester, 24... Zinc oxide element, 31, 32... Breaking mechanism, 33... Side path conductor, 38... Detention fitting, 39, 40... Interlocking yoke, 45, 46... Connecting link, 47, 48...
Stotspa.

Claims (1)

[Scope of Claims] 1. A plurality of tension insulator chains 3 and 4 that mainly share the hanging load of the overhead power transmission line 7, lightning arrester insulators 22 and 22' having a lightning protection function, and an insulator chain 21 for sharing insulation in the event of an abnormality. and a lightning arrester chain 5 connected in series are combined in parallel, and an overhead power transmission line 7 is suspended from the energized side end of the tension insulator chain 3, 4 and the lightning arrester chain 5. 6 is attached to both ends of the insulating insulator chain 21 constituting the lightning arrester chain 5, and the lightning arrester insulators 22, 22' break in response to the subsequent current after they become conductive due to abnormal discharge. A pair of breaking mechanisms 31 and 32 are attached via mounting fittings 11'' and 20, and a bypass conductor 33 is installed between both breaking mechanisms 31 and 32. Lightning arrester device for electric wires. 2. A lightning arrester chain 5 is provided between the pair of tension insulator chains 3, 4, and at the end of each insulator chain 3, 4, 5 on the energized side, a hold-down fitting for the overhead power transmission line 7 is installed. 38, a pair of interlocking yokes 39, 40, and a retaining fitting 38.
A lightning arrester device for an overhead power transmission line having an insulation recovery function as set forth in claim 1, wherein a connecting mechanism 6 is attached, which comprises connecting links 45 and 46 that connect the interlocking yokes 39 and 40. 3. The tension-resistant insulator chains 3 and 4 are divided into two parts at the part corresponding to the connection point between the lightning arrester 22, 22' that functions as a lightning arrester that constitutes the lightning arrester chain 5 and the insulator chain 21 for insulation in the event of an abnormality. A lightning arrester device for an overhead power transmission line having an insulation recovery function as set forth in claim 1 or 2, which is electrically connected so that each connection point has the same potential. 4. The insulation according to claim 3, wherein arcing horns 15, 17 are provided on both the energizing side and the grounding side of the tension insulator chains 3, 4 corresponding to the insulation insulator chain 21 of the lightning arrester chain 5. Lightning arrester device for overhead power transmission lines with recovery function. 5. The interlocking yokes 39 and 40 of the coupling mechanism 6 have an insulation recovery function as set forth in claim 2, having stoppers 47 and 48 that suppress abnormal rotation of both interlocking yokes 39 and 40 when the lightning arrester chain 5 is disconnected. Lightning arrester device for overhead power transmission lines.