JPS63158716A - Insulator for distribution line - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulator device for a power distribution line that is equipped with a current limiting element to improve arc resistance.

For conventional power distribution lines, a wire support is provided at the upper end of the main insulator, a base metal fitting is fixed to the lower end of the insulator, and the main insulator is attached to the arm of a utility pole using a mounting tool attached to the base. Insulator devices are designed to protect the wire supported by a support and the base metal fitting at the lower end that is closest to the wire if it exceeds the insulating strength of the insulator when abnormal voltage enters the distribution line due to lightning strikes, etc. A flashover occurs between the two, and a follow-on arc occurs. In this case, the arc chef) occurs upwards. As a result, the short arc spots of various types of insulator damage, such as getting into the deep grooves of the main insulator and causing the cap to chip, getting entangled with the surface, and even causing the body to break, can become fixed to the electric wire and cause a disconnection accident.

Therefore, the solution is to attach an arcing horn to both the charging side and grounding side metal fittings fixed to both sides (upper and lower ends) of the main insulator, like a power transmission line insulator device, and transfer the arc generated by this to the horn. However, in such a method that uses only an arcing horn, the commercial frequency from the power supply is superimposed at the time of flashing, resulting in a follow-on arc (arc jet), which may still cause uneven heat damage to the insulator due to the follow-on arc. or lead to wire breakage accidents.

This phenomenon does not occur at all, regardless of whether the insulated wire is fixed to the upper end of the main insulator using a metal wrapping grip or binding wire, when a bare wire is used, or when a cap metal fitting is used as a fixing device. The same thing is happening. Therefore, to prevent the generation of the following arc, an insulator device having a non-following current limiting element in a part of the upper arcing horn has been proposed in recent years (for example, in Japanese Patent Laid-Open No. 55-136
(See Publication No. 412) However, since the current limiting element is attached to the charging side of this device, there are safety concerns when installing it.
The power transmission must be temporarily stopped, and the impact on customers will be extremely large, such as the suspension of various equipment due to the power outage. This also applies when the device is removed for maintenance and inspection of the current limiting element.

Furthermore, since the arcing horn in the above insulator device has the current limiting element attached to the charging side as described above,
In order to prevent the live parts from being exposed, the structure is such that the entire part of the emission electrode except for the emission part is covered with an insulator. Therefore, it is difficult to install the discharge part exposed through the small discharge hole and the arcing horn attached to the ground side, as accurate discharge cannot be performed unless both horns are placed facing each other on the same straight line. There is a problem. In addition, the above two-side method using an arcing horn is a method in which the arcing horn is attached to both the charging side and the grounding side, respectively, and it is time-consuming to attach the arcing horn to both the upper and lower sides. ,
Since the arcing horn on the charging side needs to be insulated, there is a problem in that the cost of the entire device is unavoidably high. Further, in the method using the arcing horn, the arcing horn is fixedly attached to the upper part of the insulator together with the electric wire, so special consideration is required for installation. Furthermore, it is difficult to adjust the discharge gap, especially since the shape of insulators for distribution lines differs depending on the manufacturer and is not consistent. There is also the problem that installation becomes impossible. The present invention is intended to solve these various problems, and includes a wire support for supporting wires at the upper end of the main insulator, a base metal fitting fixed to the lower end, and a mounting device attached to the base metal fitting. In the insulator device for distribution lines, in which the main insulator is attached to the reading of a utility pole using a tool, one side of the arrester is attached to the lower terminal of the arrester, which has a non-current current limiting element built in the insulating container. The connecting fittings to be connected are connected, and the other connecting fitting is attached to and connected to the outer circumferential surface of the base fitting so that it can be freely attached and detached, and furthermore, the base part of the conductive wire-shaped arcing horn whose upper part is exposed, The arcing horn is connected to the arrester in a state in which it is established, and the connection part between the base of the arcing horn and the arrester is horizontally connected to the arrester so that the distance between the upper part of the arrester and the wire support can be adjusted. The present invention attempts to propose an insulator device for power distribution lines, which is characterized by being able to be connected freely.

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows the case where it is applied to a deep groove solid insulator, which is a type of insulator for power distribution lines. 1 is the main body insulator, 2 is the main body insulator 1 with a wire support fixed integrally to the upper end with cement etc. This is a cap metal fitting, and includes an electric wire support metal fitting 4 formed with a protrusion 4a for tightly supporting the electric wire 3 in a recess 2a at the center of the metal fitting. 5 indicates a bolt for tightening, and 6 indicates a nut.

7 is an adhesive material 8 such as cement attached to the lower end of the main body insulator 1.
It is a base metal fitting which is fixed by a base metal fitting, and on its lower surface 7a there is a fitting 11 consisting of a bolt lla and a napht llb for attaching the main insulator 1 to a reading 10 of a telephone pole.
It is equipped with Reference numeral 13 denotes an arrester, and an insulating container 14 contains a current limiting element (special element) 19 made of a sintered body mainly composed of zinc oxide ZnO, and upper terminals are provided at the upper and lower ends of the container, respectively. 15, and a lower terminal 17 is provided at the lower end via a connecting fitting 16.

As is well known, the current limiting element 19 has excellent non-linear resistance characteristics, and in the event of an abnormal high voltage such as a lightning strike, it allows only the lightning current to flow safely to the ground and blocks the follow-up current due to the commercial frequency. It is a non-following current element. 16 is arrester 13
This is a connecting fitting for electrically and mechanically connecting the lower terminal 17 of the arrester to the base fitting 7 on the earth side of the main insulator 1, and the tip thereof has a notch shape into which the pole l-113 is fitted. A connecting portion 16a and a positioning locking portion 16b that locks onto the base metal fitting 7 are formed. In addition,
To connect the arrester 13 to the main body connector 1, first loosen the NAND 11b screwed onto the fixture 11, then insert the connector 16 into the gap between the base metal fitting 7 and the reading 10 while lifting the insulator 1 slightly, and then Insert the locking part 16b until it hits the base metal fitting 7, and then tighten the nut llb again.
Tighten and install. As shown in FIG. 2, the connecting means may be a band type in which one end of the connecting fitting 16 is attached to the base fitting 7 by sandwiching its outer circumferential surface, and is further tightened with a bolt 20 at the end. . In other words, whether the arrester 13 is an existing one or a new one, it is desirable that the arrester 13 has a structure that allows it to be easily attached to and removed from the main insulator l even in a live wire state. is a conductive wire exposed outside the insulating container, and this is the arcing horn in an established state. Reference numeral 18b is for connecting the base of the arcing horn, and the bolt-shaped upper terminal 15 is inserted into the elongated hole and notch hole of the arcing horn, and is tightened integrally with a nut so that it can move freely in the notch direction (lateral direction). It is.

With the arrester 13 installed in this way, if a lightning surge enters the wire, the surge will be accurately transmitted from the wire to the arcing horn 18, and only the lightning current will escape to the ground via the current limiting element 19, and at the same time. Since the following current arc caused by the commercial frequency is interrupted by the current limiting element, it becomes possible to prevent insulator destruction and wire breakage accidents caused by the following current arc, which have conventionally been observed.

The effects of the present invention are as follows.The arrester has a non-following current limiting element built in the insulating container, and the lower part of the arrester is connected with a connecting fitting whose one end is connected to the lower terminal of the arrester. On the other hand, the above-mentioned base metal fitting can be freely attached and detached in a clamp-like manner to the outer circumferential surface of the base metal fitting, and the conductive wire-shaped arcing horn whose upper part is exposed is connected to the arcing horn with the arcing horn established against the arrester. Since the connecting part of the base part is connected to the upper part of the arrester so that it can move laterally, even if abnormal voltage such as lightning enters the high-voltage distribution line due to a lightning strike, the first thing to do is to connect the upper live part and the horn 18. When a flash fault occurs, the lightning current is safely discharged to the ground through the current limiting element of the arrester, and then the non-follow current limiting element interrupts the superimposed follow current arc due to the commercial frequency from the power supply. This eliminates the creeping flash discharge that occurs at the top and bottom ends of the main insulator, as well as the accompanying flow phenomenon, and reliably protects the insulator from uneven heat damage caused by arc jets during follow-on flow, which was seen in the past. can do. At the same time, it also has the effect of preventing wire breakage accidents.

The second point is that when installing the arrester, the arcing horn 18 is attached to the arrester 13, and since both are integrated, the arrester 13 can be attached to the base metal fitting on the ground side of the insulator.
3 and the installation or removal of the arcing horn 18) can be safely carried out without stopping power transmission on the power distribution line and keeping the line live, which has a great practical effect.

Thirdly, due to the above-mentioned circumstances, the arrester 13 can be inspected without causing a power outage to the line.

Furthermore, the fourth point is that not only can the arcing horn 18 and the arrester 13 be simultaneously attached and detached from the base metal fitting 7 side during power transmission as described above, but also
In that case, since the other connecting fitting 16 is configured to be attached to the outer peripheral surface of the base fitting 7 in a sandwiched manner, the base fitting 7 remains supporting the electric wire (in this case, the base fitting 7 is completely grounded). It is also effective for high efficiency and safe work, as it can be quickly attached and detached (in a safe state).

Furthermore, as a fifth point, since the arcing horn 18 is established above the arrester 13, the bare conductor part of the horn 18 is located higher than the arrester 13, as if it were an antenna. This also has the effect of widening the capture range of lightning surges, making it possible to accurately capture discharges caused by lightning surges that have penetrated power distribution lines and reliably discharge them to the ground.

Furthermore, as a sixth point, the above antenna-like horn 18
Even if the antenna is integrated with the arrester 13 and can be attached to and detached from the base metal fitting 7, the position of the antenna relative to the live part must be adjusted so that the connecting part between the base of the arcing horn and the arrester is at the top of the arrester. It is movable laterally to allow adjustment of the distance between the wire support and the wire support.
This also has the effect that even in the case of distribution line insulators made by different manufacturers, the position of the antenna-like hoe 718 can be set so as to obtain a desired gap.

Furthermore, as a seventh point, although the entire arcing horn 18 is exposed as described above in the above case, since it is attached to the ground side together with the arrester 13, the operator may accidentally touch it for some reason. It also has the advantage of being safe without causing electric shock even if something happens.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 shows the installed state of an insulator device for a power distribution line. FIG. 2 is a front view showing the side where the outer periphery of the base metal fitting is held between the connecting metal fittings. (1)...Main insulator, (2)...Support, (4
)... Electric wire, (7)... Base metal fitting, (10)
... Reading, (11)... Fixture, (13)...
・Arrester, (15)...Top terminal, (16)
... Connection fitting, (17) ... Lower terminal, (18
)... Arching horn, (19)... Current limiting element. Sai 1 figure + 2 circles

Claims (1)

[Claims] An arrangement in which a wire support for supporting electric wires is provided at the upper end of the main insulator, a base metal fitting is fixed to the lower end, and the main insulator is attached to a cross arm of a telephone pole using a fitting attached to the base metal fitting. In an insulator device for electric wires, a connecting metal fitting is connected to the lower part of the arrester, which has a non-following current limiting element built in the insulating container, and one side of the connecting metal fitting is connected to the lower terminal of the arrester, and the other side of the connecting metal fitting is connected to the above-mentioned base. A clamp-like attachment/detachment to the outer circumferential surface of the metal fitting is freely attached and connected, and the base of the conductor-shaped arcing horn whose upper part is exposed is connected to the arrester in such a state that the arcing horn is established.
Furthermore, the connecting portion between the base of the arcing horn and the arrester is connected so as to be movable laterally so that the distance between the upper portion of the arrester and the wire support can be adjusted. Device.