JPH0334009Y2 - - Google Patents

Description

[Detailed explanation of the invention] Purpose of the invention (industrial application field) This invention uses a lightning protection function to quickly discharge lightning to the ground when a power transmission line is struck by lightning.
The present invention relates to an arc horn in a lightning arrester for power transmission lines that can prevent permanent ground faults by suppressing and interrupting follow-on current.

(Problems to be solved by conventional techniques and ideas) In recent years, lightning arrester insulators have begun to be used on power transmission lines to prevent power outage accidents caused by lightning surge currents. This lightning arrester has a built-in current-limiting element made of zinc oxide or other material with non-linear voltage-current characteristics inside the insulator body. When it deteriorates, its insulation properties as a lightning arrester decrease. To ensure the reliability of power transmission lines, it is necessary to periodically measure and inspect the insulation properties of lightning arrester insulators, and replace them if any abnormalities are found.

Conventionally, the insulation resistance of the above-mentioned lightning arrester has been measured by placing the power transmission line in a power outage state and measuring the insulation resistance between both electrodes.

However, measurement using this insulation resistance meter not only requires a power outage due to its method, but also requires workers to approach the support arm of the tower and connect the lead wire of the insulation resistance meter to the arc horn of the lightning arrester. However, there were problems in that the measurement work was troublesome and highly dangerous.

Therefore, the inventors of this invention had a worker on the main body side of the tower, attached contacts to both the upper and lower ends of the detector attached to the tip of the operating rod, and attached both contacts to the arc horn of the lightning arrester. Although a measuring instrument was devised that could be locked, it became necessary to reliably lock the contact of the measuring instrument to the arc horn.

The present invention has been made to satisfy the above requirements, and its purpose is to provide an arc horn for a lightning arrester that can securely lock a contactor of a detector to the arc horn of the lightning arrester. It is in.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention accommodates a current limiting element with non-linear voltage-current characteristics inside the insulator body, and connects both ends of the insulator body. In a lightning insulator in which a grounding side electrode fitting and a charging side electrode fitting are attached to the electrode fittings, and arcing horns on the grounding side and the energizing side are attached to both electrode fittings, the electrical characteristics of the lightning arrester are determined for both the arcing horns. A method is adopted in which locking protrusions are provided that can lock both the upper and lower contacts of the detector that measures the .

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

Since the pair of arc horns of the lightning arrester of the present invention are each equipped with a locking protrusion, the contacts provided at both the upper and lower ends of the detector side can be quickly and reliably locked to both the locking protrusions. , the work of measuring the electrical characteristics of the lightning arrester using the detector can be carried out reliably and easily.

(Example) Below, an example embodying the present invention is shown in Figure 1~
This will be explained based on FIG.

Support arm 2 of steel tower 1 as shown in Figures 2 and 3
A power transmission line support insulator 3 made of a long trunk insulator is suspended and fixed by a bolt 4 at the tip end of the power transmission line, and a power transmission line 6 is supported at the lower end thereof via a wire clamp 5.
The electric wire clamp 5 supports a discharge electrode 7 on the power supply side.

On the other hand, a mounting bracket 8 is fixed to the tip of the support arm 2 horizontally and in a stepped manner from the bolt 4, and a lightning arrester 9 is attached to the ground side electrode fitting 10 on the lower surface of the tip of the bracket 8. It is suspended and fixed by a bolt 11. Further, the lower end of the lightning arrester 9, that is, the electrode fitting 1 on the power charging side
2 supports a horn-shaped ground side discharge electrode 13, and a predetermined air discharge gap G is provided between the discharge electrode 13 and the discharge electrode 7.

The lightning arrester 9 has a voltage-current characteristic mainly composed of a voltage-resistant insulating cylinder (not shown) formed in a cylindrical shape from a tensile material such as FRP, and zinc oxide (ZnO) housed in series inside the cylinder. Current-limiting element 1 with nonlinearity
4, the cap-shaped electrode fittings 10 and 12 on the grounding side and the voltage charging side that are fitted and fixed to both ends of the voltage-resistant insulation cylinder, and a rubber mold 15 provided on the outer periphery of the voltage-resistant insulation cylinder, and the above-mentioned limiter. A spring (not shown) for holding the flow element 14 in pressure contact with both the electrode fittings 10 and 12, and the electrode fittings 10 on the grounding side and the charging side,
12, and reduce damage to the rubber mold 15 during creeping flash. Further, it is formed of annular arc horns 16 and 17 for suppressing damage when the current limiting element electrically breaks down, making it impossible to cut off the following current and releasing pressure.

Further, as shown in FIG. 1, the arc horn 1
Locking protrusions 18 and 19 for locking spring contacts 23 and 24 of the detector 20, which will be described below, are welded and fixed to the sides of 6 and 17, and their tips are rounded to prevent corona. It has a key-shaped part to prevent the contact from slipping. The detector 20 includes an operating rod 21, a measuring section 22 fixed vertically to the tip of the operating rod 21, and the measuring section 2.
It is comprised of bifurcated contacts 23 and 24 that are cantilevered at both upper and lower ends of the contactor 2. This detector 20 is constructed by a worker climbing a step 25 provided on the steel tower 1 to the same height as the lightning arrester 9, grasping the operating rod 21 while remaining on the tower 1 side, and connecting both the contacts 23 and
24 to the locking protrusions 18 and 19, it is used to measure the electrical characteristics of the lightning arrester 9.

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

Now, when a lightning surge is applied to the power transmission line 6, this current is discharged from the wire clamp 5 and the discharge electrode 7 on the energized side to the discharge electrode 17 on the ground side through the discharge gap G, and the current is discharged to the discharge electrode 17 on the ground side. It flows to the element 14, flows from the electrode fitting 10 on the ground side to the support arm 2 via the mounting bracket 8, and further flows to the steel tower 1 and is discharged to the earth. Subsequent currents that occur thereafter are suppressed and blocked by the current limiting element 14.

Now, in the embodiment of the present invention, since the locking protrusions 18 and 19 are provided on the arc horns 16 and 17 of the lightning arrester 9, both the contacts 23 and 24 of the detector 20 can be easily locked. Furthermore, there is no fear that both contacts may slip and fall during operation, and therefore the electrical characteristics of the lightning arrester 9, such as the insulation resistance test, can be measured reliably, safely, and easily.

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

In the above embodiment, the locking protrusion 1 is attached to the arc horn.
8 and 19, or two of these are provided, or the plane is approximately V as shown in Fig. 4.
To make it difficult for corona to occur by forming it in a letter or arc shape.

By the way, the current-limiting element 14 of the lightning arrester 9 is housed inside a voltage-resistant insulating tube (not shown) as described above, and as shown in FIG. The fiber thread 32a
The glass tape 33 made of fiber threads 32a is wound in a spiral manner overlapping and reciprocating as shown in FIG. 6. Alternatively, as shown in FIG. 7, glass thread 34 may be spirally wound in the same manner as the crow tape 33, impregnated with resin, and then thermally cured for reinforcement. Alternatively, the glass cloth 32, the glass tape 33, and the glass thread 34 may be impregnated with resin in advance, and then heat-cured after being wrapped. Furthermore, the winding angle is in the range of 30 degrees to 60 degrees, but 45 degrees is most desirable.

By reinforcing the voltage-resistant insulating tube 31 in this way, when a bending load acts on the voltage-resistant insulating tube 31 or when the current-limiting element 14 becomes conductive due to a lightning surge, the internal pressure of the voltage-resistant insulating tube 31 increases. In such cases, mechanical strength can be significantly improved.

Effects of the invention As detailed above, this invention measures the electrical characteristics of the lightning arrester by simply and quickly locking a pair of upper and lower contacts provided at the tip of the detector to the arc horn of the lightning arrester. Therefore, it is an excellent idea as an arc horn for lightning protection insulators.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment embodying the present invention; Figure 1 is a perspective view of the main parts, Figure 2 is a front view showing the entire lightning arrester device, and Figure 3 is Figure 2. FIG. 4 is a perspective view of only the essential parts showing another example of the present invention, and FIGS. 5 to 7 are front views showing examples of reinforcing structures for the voltage-resistant insulating cylinder, respectively. DESCRIPTION OF SYMBOLS 1... Steel tower, 2... Support arm, 9... Lightning arrester, 10... Electrode fitting on the grounding side, 12... Electrode fitting on the charging side, 13... Discharge electrode, 16, 17...
Arc horn, 18, 19...Locking protrusion, 20...
...detector, 23, 24...contact.

Claims (1)

[Claims for Utility Model Registration] 1. A current limiting element with non-linear voltage-current characteristics is housed inside the insulator body, and a grounding side electrode fitting and a charging side electrode fitting are attached to both ends of the insulator body. However, in a lightning arrester in which both electrode fittings are provided with arc horns on the grounding side and on the energizing side, both upper and lower contacts of a detector for measuring the electrical characteristics of the lightning arrester can be locked to both arc horns. Arc horn in lightning arrester insulator with locking protrusion. 2. The arc horn in the lightning arrester according to claim 1, wherein the locking protrusion is formed in an arc shape to prevent the generation of corona.