JPS6332815A - Support insulator for transmission line - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention is designed to quickly ground a power transmission line when a current due to a lightning strike flows through it, and also to prevent short-circuiting of a lightning protection element by a lightning strike current that exceeds a design value. The present invention relates to a support insulator device for a power transmission line that can disconnect the lightning arrester from an electrical circuit without mechanically disconnecting it in the event of a failure, thereby preventing permanent ground faults and enabling power retransmission.

(Prior Art) Conventionally, as shown in FIG. 7, a lightning arrester for power transmission lines has been constructed by suspending a suspension insulator chain 41 from a support arm 1 of a steel tower, supporting a power transmission line 9 at its lower end, and A lightning arrester 42 is rotatably supported in the middle part of the arm 1, and its tip is connected to the wire clamp 10 of the power transmission 'a9.
3 was activated, the lightning arrester 42 was mechanically and electrically disconnected from the power line 9 to prevent a permanent ground fault.

(Problems to be Solved by the Invention) However, in the conventional lightning arrester device for power transmission lines, when the disconnecting portion 43 of the lightning arrester 42 is operated, after the disconnection portion 43 is separated,
There was also a risk that the suspension insulator 41 would be approached again and the suspension insulator 41 would collide with the lightning arrester 42, causing the suspension insulator 41 to be damaged. Furthermore, when the lightning arrester 42 is disconnected from the power transmission line 9, the lightning arrester 42 is considered to be electrically connected.
It is necessary to ensure a predetermined insulation distance between the power transmission line 9 and the power transmission line 9, and from this point of view as well, it is necessary to increase L.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a lightning arrester including a lightning arrester whose voltage-current characteristics are non-linear, and an insulator formed of an insulator. The lightning arrester insulators are sequentially connected from the grounding side to the energized side using a fusible conductor that melts when a predetermined amount of commercial frequency current flows. There is.

(Function) By adopting the above-mentioned means, the present invention functions as follows.

When the lightning arrester attached to the lightning insulator is penetrated or flashed due to deterioration or excessive surge, a fault current flows and the fusible conductor is fused, and the original insulation distance of the insulator is maintained.
Even if the lightning arrester becomes electrically conductive, permanent ground faults are prevented and power can be retransmitted. At this time, mechanically, since the lightning arrester remains fixed in the insulator device, it is possible to prevent the lightning arrester and the insulator from separating and colliding with each other, and damage to both insulators is prevented.

(First Embodiment) The first embodiment embodying the present invention will be described below with reference to FIGS. 1 and 2.
This will be explained based on the diagram.

A hanging metal fitting 2 is fixed to the tip of the support arm 1 of the steel tower, and a suspension insulator chain 6 is attached to the hanging metal fitting 2 through a U clevis link 3, a horn mounting fitting 4, and a connecting link 5. It is supported so as to be swingable in the same orthogonal direction. A wire clamp 10 for supporting a power transmission line 9 is supported by a connecting link 7 at the lower end of the suspension insulator chain 6 via a horn fitting 8. The horn mounting bracket 4.8 has a suspension insulator chain 6.
Arcing horns 11 and 12 are installed to release pressure or to induce an arc when arcing occurs.

The suspension insulator chain 6 has ordinary suspension insulators 13 as insulators and lightning suspension insulators 14 as lightning arresters (shaded in FIG. 1) alternately arranged in series. It is configured by connecting. Further, as shown in FIG. 2, the insulating suspension insulator 13 has a cap fitting 16 fitted and fixed with cement to the head 15b of the insulator main body 15 having the sub-portion 15a, and the lower suspension insulator 14 is fitted inside the head.
It is constructed by fitting and fixing pin fittings 17 with cement for connecting and suspending. On the other hand, the lightning suspension insulator 1
4 is a shade of the insulator body 15 as shown in the lower part of FIG.
The voltage of zinc oxide (ZnO) as the main material for the part 15a is -
A lightning arrester element 18 with non-linear current characteristics is inserted and fixed vertically and in a flat shape, and the upper end electrode 19 of the lightning arrester element 18 and the cap fitting 16 are electrically connected by a lead 120, and the lightning arrester element 18 18 lower electric bridges 21 and the bottle metal fittings 17 are electrically connected by lead wires 22. Note that the lightning arrester elements 18 are provided at three locations at equal intervals.

As shown in FIG. 1, vertically adjacent insulating suspension insulators 13,
The camping fitting 16 of the lightning arrester suspension insulator 14 is connected to the cylindrical portion 15a of the insulating suspension insulator 13 by a fusible conductor 23 that is fused when a predetermined amount of current flows, that is, when a commercial frequency current flows for a certain period of time or more due to a ground fault. It is connected by bypassing.

Next, the operation of the lightning arrester device for power transmission lines constructed as described above will be explained.

Now, when a lightning current is applied to the power transmission line 9 due to a lightning strike, this current passes through the wire clamp 10, the horn mounting bracket 8, and the connecting link 7, and then passes through the pin bracket 17 of the lowermost lightning arrester suspension insulator 14.
, flows to the lead wire 22, the lower electrode 21, the lightning arrester 18, the upper electrode 19, the lead wire 20, and the cap fitting 16, and further flows from the fusible conductor 23 to the cap fitting 16 of the insulating suspension insulator 13 directly above, and in the same manner. It sequentially flows alternately through the lightning arrester suspension insulator 14 and the insulating suspension insulator 13, and then flows through the connecting link 5, the horn mounting bracket 4, the U clevis link 3, the hanging bracket 2, and the support arm 1 to the steel tower, and flows to the tower member (not shown). This prevents it from being released into the ground via the lead wire and causing a flashover accident.

By the way, if the lightning strike exceeds the design value and is excessive, an abnormal lightning current will flow and the lightning protection element 18 will develop a through-flash fault.As a result, the ground fault current of the power transmission voltage will follow, and The conductor 23 is fused by this follow-on current, and at the same time the circuit breaker is operated, resulting in a power outage, but the suspended insulator 13 recovers its own insulation and power can be transmitted again.

(Second example) Next, a second embodiment will be explained with reference to FIG.

In this embodiment, the above-mentioned suspension insulator chain 6 is attached to the support arm 1.
are arranged in parallel on the left and right, and the cap fittings 16 of the right-hand lightning arrester suspension insulator 14 and the cap fittings 16 of the left-hand insulating suspension insulator 13 are connected alternately from the grounding side to the energized side by means of the fusible conductor 23. It is connected sequentially towards.

Further, two insulating suspension insulator chains 26 are suspended from the lower ends of the double-suspended insulator chains 6.6 via a connecting yoke 25, and electric wires are connected to the lower ends of the double-suspended insulator chains 26 via a connecting yoke 27. A clamp 10 is supported. Furthermore, the reconnection yoke 25
．． Similarly, a fusible conductor 28 is connected between 27.

Also in the insulator device of the second embodiment, when the lightning arrester element 18 undergoes a through flash, the ground fault current of the transmission voltage becomes a follow-on current and flows through the fusible conductor 28.23.
2 is fused by this follow-on current, and at the same time the system circuit breaker operates, resulting in a power outage. Since it is possible to prevent electrical faults, it is possible to retransmit power.

As a modification of the second embodiment, as shown in FIG.
．． 26 may be provided. Alternatively, as shown in FIG. 5, two suspended insulating insulators 14 connected vertically in series may be used as one unit.

(Third Embodiment) To explain the third embodiment shown in FIG. 6, this embodiment has a five-speed suspension insulator chain 6, and one to three lightning arrester suspension insulators 14 are installed in each suspension insulator chain 6. They are connected in a stepwise manner from the ground side to the energized side using the fusible conductor 23.

In this third embodiment, if the fusible conductor 23 is fused, since there are only 1 to 3 lightning arresters 14 in each suspension insulator chain 6,
Compared to each of the embodiments described above, this embodiment has the advantage that the insulation distance can be easily secured.

Note that the present invention can also be embodied as follows.

(1) Although not shown, the four-speed suspension insulator chains 6 to G are suspended from the tip of the support arm 1 so as to be parallel to each other and positioned at the four corners of a square.

(2) Although not shown, the insulating suspension insulator 13 and the lightning arrester suspension insulator 14 are replaced with an insulating long trunk supporting insulator and a lightning arresting long trunk supporting insulator.

The operation of the insulator device of this embodiment is also similar to that of the previous embodiment.

Effects of the Invention As detailed above, this invention prevents unexpected lightning currents from acting on power transmission lines and flashing through the lightning arrester, or deteriorating the lightning arrester and causing follow-on current to flow. When this occurs, the fusible conductor is melted by the following current, allowing the insulator to perform its original function, cutting off the following current, making it possible to retransmit power, and preventing damage to the insulator due to collision. There is.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a first embodiment embodying the present invention, FIG. 2 is a partially enlarged half-longitudinal sectional view of FIG. 1, and FIG. 3 is a front view showing a second embodiment of the present invention. 4 and 5 are respectively front views of the road body showing a modification of the second embodiment, FIG. 6 is a front view of the road body showing the third embodiment, and FIG. 7 is a front view of the conventional example. .

Claims (1)

[Claims] 1. A lightning arrester having a lightning arrester with non-linear voltage-current characteristics and one or more units of insulators each made of an insulator are alternately connected, and a commercial frequency current is A support insulator device for a power transmission line, characterized in that each of the lightning arrester insulators is sequentially connected from a grounding side to a power supplying side using a fusible conductor that melts when a predetermined amount flows. 2. A patent claim in which one or more insulating suspension insulators and one or more lightning arrester suspension insulators as a lightning arrester are connected in series alternately, and each lightning arrester suspension insulator is connected by a fusible conductor so as to bypass the insulating suspension insulator. The power transmission line support insulator device according to item 1. 3. A plurality of suspension insulator chains each consisting of one or more units of insulating suspension insulators and lightning arresting suspension insulators serving as lightning arresting insulators connected in series alternately are installed in series, and each lightning arresting suspension insulator is connected to each suspension insulator series. The power transmission line according to claim 1, wherein the lightning arrester suspension insulators are arranged in a staggered manner or in a stepwise manner so that their vertical positions are different, and each suspension insulator is sequentially connected with a fusible conductor so as to cross between each suspension insulator chain. support insulator device. 4. A plurality of long-stem support insulators, which are constructed by alternately connecting insulating long-stem support insulators as insulation insulators and lightning long-stem support insulators as lightning arresting insulators in series, are installed in parallel, and the lightning long-stem support insulators are A patent claim in which the long stem support insulators are arranged so that the vertical positions differ in a staggered manner or in stages, and the lightning protection long stem support insulators are sequentially connected by a fusible conductor so as to cross the long stem support insulators. The power transmission line support insulator device according to item 1.