KR101099897B1 - Lightning arrestor - Google Patents

Abstract

A pair of electrodes 4 and 5 are arranged on both sides of the zinc oxide element block 1 and the series 3 of the pressure springs 2, and both electrodes 4 and 5 are formed by the insulating rod 6. In the lightning arrester where the zinc oxide element module 8 is fastened to each other, the fastening portions of both electrodes 4 and 5 and the insulating rod 6 have one end side of the insulating rod 6 attached to one of the electrodes 4. Insert into 4b and fasten with nuts 7a and 7b from both sides of the attachment hole 4b, and insert the other end side of the insulating rod 6 into the attachment hole 5b of the other electrode 5, It was comprised so that it may fasten with the nut 7c from the serial body side, and to fix to each flange part 4a, 5a.

lightning arrester

Description

Lightning Arrester {LIGHTNING ARRESTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an arrester connected to a power system and protecting an electric device from abnormal voltages such as switching surges and lightning surges generated in a circuit. The outer periphery relates to an arrester in which an outer shell formed of an insulating material such as silicone rubber or polymer is deposited.

The basic structure of the inside of the lightning arrester, which is made of an insulating material such as silicone rubber or polymer, is constituted by insulators such as FRP arranged around a laminate of zinc oxide elements being fastened to electrodes arranged at both ends of the laminate. have. Since the insulating material of the outer shell does not have rigidity, the insulating material such as FRP is used to have mechanical strength as an arrester.

As a conventional technique of such a lightning arrester, for example, upper and lower brackets are arranged above and below the stacked zinc oxide elements, and the upper and lower brackets are fixed with FRP rods as strength members, and the surroundings are rubber-based polymers. It is known that the material is molded from a shell member containing the main material. The upper, lower, and FRP rods penetrate the FRP rods through both brackets, and fasten and fix nuts on both sides thereof (see Patent Document 1, for example).

In addition, as another example of fixing the insulating electrode and the upper electrode portion and the lower electrode portion disposed at both ends of the zinc oxide element block, a pressing plate having a conical hole widening to the end side is provided on both electrodes. A technique of fixing the upper and lower electrodes and the insulating rod by inserting an insulating rod into the conical holes of the upper and lower pressure plates, inserting the cone rods from both ends of the insulating rod, and fixing the insulating rod to the pressure plate is disclosed. (See, for example, Patent Document 2).

Patent document 1: Unexamined-Japanese-Patent No. 6-310307 (2nd page, FIG. 1)

Patent document 2: Unexamined-Japanese-Patent No. 2002-175905 (2nd page, FIG. 1)

Problems to be Solved by the Invention

In the conventional lightning arrester as shown in Patent Literature 1, through holes are provided in the upper and lower openings, which are electrodes disposed above and below the stacked zinc oxide element, to allow the FRP rod to pass therethrough, and the FRP rod penetrates the through hole. Tighten with nuts on both sides. Therefore, in the assembling process of the arrester, first, the FRP rod is passed through the through hole of the lower bracket and the nut is fastened at the end side. Since the through hole is larger than the diameter of the FRP rod, the FRP rod is not fixed to the lower bracket in this state. , Flows down. In addition, when the FRP rod is passed through the through hole of the upper bracket after the zinc oxide element is laminated in the lower hole, the workability is extremely bad because it is necessary to lift all the plurality of FRP rods and pass the through hole of the upper bracket simultaneously. Has a problem.

In addition, in the lightning arrester shown in Patent Document 2, since the electrode portion and the insulating rod are fixed with a cone-shape, slipping of the insulating rod is eliminated during assembly and assembly workability is improved, but the fixing force between the upper and lower electrode portions and the insulating rod is improved. If there is a weak load, for example, when the load is applied to the insulating rod due to the electromagnetic force generated during an accident of the arrester, the insertion part of the insulating rod is weak and there is a problem that the fastening may be loosened.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and an object thereof is to obtain an arrester having improved strength at the time of assembling and securing sufficient strength at the fastening portion of the electrode and the insulating rod.

Means to solve the problem

The lightning arrester according to the present invention is disposed on both sides of a zinc oxide element block in which a plurality of zinc oxide elements are stacked, a pressure spring disposed on one end surface of the zinc oxide element block, and a series of zinc oxide element blocks and the pressure spring. A zinc oxide element module is constituted by a pair of electrodes having a flange portion on the side opposite to the series body, and a plurality of insulating rods that attach both ends to attachment holes formed in each flange portion to fasten both electrodes. In a lightning arrester in which an outer skin containing a rubber-based polymer material as a main component is deposited by a mold around a device module, the fastening portion of the positive electrode and the insulating rod has one end of the insulating rod inserted into the attachment hole of one of the two electrodes. The other end of the insulating rod is inserted into the attachment hole of the other electrode, and is connected to the side of the anti-serial body. It is fastened by a nut that is fixed to the respective flange.

Effects of the Invention

According to the lightning arrester of the present invention, the insulating rod for fastening the zinc oxide element block and one electrode fasten the insulating rod through the attachment hole to the flange portion with nuts at both sides of the attachment hole, and the other electrode is fastened with the other electrode. Since the part is made to fasten and fix the insulating rod which penetrated the attachment hole to the flange part by the nut from the semi-parallel side of the attachment hole, when the zinc oxide element block is assembled between both electrodes, the insulating rod will not flow down or shake. In addition, since no idle occurs when the nut is tightened, workability during assembly is improved. Moreover, since it is fastening by a nut, sufficient strength can be ensured at the fastening part of an electrode and an insulating rod.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the arrester in Embodiment 1 of this invention.

Fig. 2 is a sectional view showing the arrester according to the second embodiment of the present invention.

3 is a cross-sectional view showing another example of the arrester according to the second embodiment of the present invention.

Embodiment 1.

1 is a cross-sectional view of an arrester according to Embodiment 1 of the present invention. (A) is a side sectional view, (b) shows the plane sectional view of the principal part seen by I-I of (a). As shown in the figure, a plurality of zinc oxide elements 1a having a columnar shape are stacked and formed in a central portion, and a zinc oxide element block 1 is arranged. On one end side (upper side in the drawing) of the zinc oxide element block 1, a pressurizing spring 2 for applying a pressing force to the zinc oxide element block 1 is arranged. In addition, although the press spring 2 is shown in figure as a coil spring, a pan spring etc. may be sufficient as it.

The series body 3 is comprised by the zinc oxide element block 1 and the pressure spring 2. The lower electrode 4 and the upper electrode 5 are arranged on both sides of the series 3, and the flanges 4a, 2 are provided on the sides of the electrodes 4 and 5 that face the series 3, respectively. 5a) is formed. As shown in the drawing, the lower electrode 4 and the upper electrode 5 each have a two-stage flange portion, and the fastening of the insulating rod 6 and the pair of electrodes 4 and 5 is performed by the insulating rod 6. ) And the pair of electrodes 4, 5 are fastened to the flange portions 4a, 5a on the side of the series body. The pair of electrodes 4 and 5 have the same shape. In the outer peripheral portion of each of the flange portions 4a and 5a, a plurality of attachment holes 4b and 5b for attaching the insulating rod 6 are provided (four in the figure).

The insulating rod 6 is provided with the screw part in the both ends, and is arrange | positioned at substantially equal intervals around the zinc oxide element block 1. The fastening part of the insulating rod 6, the lower electrode 4, and the upper electrode 5 is inserted into the attachment hole 4b of the lower electrode 4 by the one end side of the insulating rod 6, and attaching the hole 4b. ) Are fastened to the nuts 7a and 7b on both sides of the upper side, and the other end is inserted into the attachment hole 5b of the upper electrode 5, and the nut 7c is provided from the opposite side of the series body 3 (semi-linear body side). Are fastened to the flange portions 4a and 5a. In this state, the zinc oxide element block 1 is pressed by the pressing force of the pressure spring 2, is firmly fixed and integrated between both electrodes 4, 5, and the zinc oxide element module 8 as a whole is integrated. This is composed.

In order to cover the circumference of the zinc oxide element module 8, an outer shell 9 made of an insulating material mainly composed of a rubber-based polymer material (for example, silicone rubber or polymer having weather resistance) is integrally formed by a mold. It is formed and the lightning arrester is comprised.

When the arrangement relationship between the zinc oxide element block 1 and the insulating rod 6 portion is shown in a plan sectional view, it is as shown in Fig. 1 (b) and the insulation is made with a slight gap in the radial direction of the zinc oxide element block 1. The rod 6 is arranged. This prevents the nut 7a present on the side of the lower electrode 4 which is in contact with the zinc oxide element block 1 from interfering with the zinc oxide element 1a, and enables the fastening operation of the nut 7a. It is a gap to do so.

In the lightning arrester configured as described above, an assembling operation of stacking and assembling the zinc oxide element 1a between the lower electrode 4 and the upper electrode 5 will be described.

First, a nut 7a (a washer is combined with a nut, but a washer is omitted in the following description) is inserted into one end side of the insulating rod 6, and fastened to a predetermined position. Next, the end on the side where the nut 7a is fastened is inserted into the attachment hole 4b formed in the flange portion 4a of the lower electrode 4 until the nut 7a abuts, and the end side From the other nut 7b. One of the nuts on both sides of the attachment hole 4b is fixed with a tool, and the other is tightened with a predetermined torque to be fixed to the flange portion 4a. All the insulating rods 6 are attached to the flange portion 4a in the same manner. When it is completed, four insulating rods 6 are vertically placed on the flange portion 4a of the lower electrode 4.

The number of the insulating rods is not limited to four, but may be three, six, or the like.

Next, a zinc oxide element block 1 is formed by stacking the zinc oxide element 1a in the center portion surrounded by the four insulating rods 6 standing up. The pressure spring 2 is disposed on the zinc oxide element block 1, and from above, the upper end of the insulating rod 6 is fitted with the attachment hole 5b of the upper electrode 5 aligned, and the attachment hole 5b is inserted therein. ), The nut 7c is tightened from the side of the semi-serial body, and the flange portion 5a is tightened. At this time, since a strong reaction force of the pressing spring 2 is applied, it is preferable to use a jig that pressurizes the pressing spring 2 and keeps the electrodes 4 and 5 at a predetermined distance.

By these operations, the series body 3 of the zinc oxide element block 1 and the pressure spring 2 is pinched by the positive electrodes 4 and 5, and the insulating rod 6 and the nut 7 (7a to 7c). The zinc oxide element module 8 is firmly fixed and integrated into the unit.

After that, the shell 9 described above is formed on the outer circumference of the zinc oxide element module 8 by a mold to complete the arrester.

As described above, the invention of the present embodiment is characterized in that, when attaching one end of the insulating rod 6 to the lower electrode 4, the two nuts are sandwiched and fixed at both sides of the flange portion 4a. . According to such a structure, since the insulating rod 6 does not flow down or shakes from side to side at the time of assembly work, the stacking operation of the zinc oxide element 1a can be made easy, The upper electrode 5 can also be easily inserted into the insulating rod 6. In addition, since the lower side is fixed using the two nuts 7a and 7b, when tightening the upper nut 7c, the lower fastening portion does not turn together, so the lower nut is fixed with a spanner. No work, such as, is made, and the tightening work is simplified.

In addition, in the drawing, the lower electrode 4 and the insulating rod 6 are fixed with two nuts, and the upper electrode 5 and the insulating rod 6 are fixed with one nut. The upper electrode 5 side may be fixed with two nuts, and the lower electrode 4 side may be fixed with one nut.

As described above, according to the invention of the present embodiment, the fastening portion of the electrode and the insulating rod arranged at both ends of the zinc oxide element block inserts one end side of the insulating rod into the attachment hole of one electrode, and both sides of the attachment hole. The zinc oxide element block is assembled between the two electrodes because the end of the insulating rod is inserted into the mounting hole of the other electrode, the nut is tightened from the semi-parallel side, and the flange is fixed to each flange. At the time, since the insulating rod does not flow down or shake, and turning does not occur when the nut is tightened, workability at the time of assembly can be improved. In addition, since the fastening by the nut can secure sufficient strength to the fastening portion of the electrode and the insulating rod, it is possible to provide an arrester having sufficient strength against the electromagnetic force generated when a short circuit current flows.

Embodiment 2:

2 is a cross-sectional view of an arrester according to Embodiment 2 of the present invention, (a) is a side cross-sectional view, and (b) is a planar cross-sectional view of the main portion viewed in II-II of (a). Since the basic structure consisting of a zinc oxide element block, a pressure spring, an upper and lower electrode, an insulating rod, a nut, and an outer shell is equivalent to that of FIG. Explain.

The part different from FIG. 1 is the structure of the electrode of the side fastened with the insulating rod by two nuts. In the case of Fig. 2, the lower electrode corresponds to it. The lower electrode 10 of the present embodiment is basically similar to the lower electrode 4 described in FIG. 1 of the first embodiment, and is a series of a zinc oxide element block 1 and a pressure spring 2. The flange part 10a is provided in the side facing (3), and the attachment hole 10b is formed in the flange part 10a. Another thing is that the element receiving part 10c which has the outer diameter part smaller than the outer diameter of the zinc oxide element 1a is provided in the surface which opposes the series body 3 of the flange part 10a. .

In addition, although the element receiving part 10c was formed integrally with the lower electrode 10 in the figure, you may make it a separate member. Contrary to the drawing, the upper electrode 5 side may be fastened with two nuts, and an element receiving portion may be provided on the surface of the flange portion 5a. That is, the element receiving part should just be provided in the electrode of the side which fastens the end of an insulating rod with two nuts.

By such a structure, since the space of the difference of the outer diameter of the zinc oxide element block 1 and the element receiving part 10c arises, it interferes with the nut 7a and the zinc oxide element block 1 outer periphery. Can be avoided, and it becomes possible to arrange | position the insulating rod 6 approaching the outer peripheral surface side of the zinc oxide element block 1. When the difference between the outer diameter of the zinc oxide element 1a and the outer diameter of the element receiving part 10c is larger than the difference between the outer diameter of the nut 7a and the outer diameter of the insulating rod 6, the insulating rod 6 is made of zinc oxide. It can approach until it comes in close contact with the element block 1. That is, it can arrange | position in the state shown in FIG.2 (b).

3 shows another example of the arrester according to Embodiment 2 of the present invention. (a) is side sectional drawing, (b) is planar sectional drawing of the principal part seen by III-III of (a).

The components of the arrester are the same as those in FIG. 1 of the first embodiment. The part different from FIG. 1 is the insertion position of the press spring 2, and the arrangement of the insulating rod 6 accompanying it.

As shown in FIG. 3, the pressure spring 2 is an electrode on the side fastened using two nuts 7a and 7b, that is, a lower electrode 4 and a zinc oxide element block 1 in this drawing. It is interposed between. And the outer diameter of the pressurizing spring 2 is made smaller than the outer diameter of the zinc oxide element 1a.

With such a configuration, the insulating rod 6 can be disposed close to the outer peripheral surface side of the zinc oxide element block 1 similarly to the case of FIG. The planar cross section of the zinc oxide element block 1 and the insulating rod 6 is as shown in FIG. 3 (b), and can be approached until it comes in close contact by devising the outer diameter dimension of the pressure spring 2.

As described above, according to the invention of the present embodiment, in the lightning arrester having the same configuration as that of the first embodiment, the surface on the side of the electrode on the side where the one end of the insulating rod is fastened by two nuts is opposed to the series body. Since the element receiving part which has the outer diameter part smaller than the outer diameter of a zinc oxide element was provided, in addition to the effect similar to Embodiment 1, since an insulating rod can be arrange | positioned close to a zinc oxide element block, compared with Embodiment 1, The outer diameter of the outer shell can be reduced, and the effect that the lightning arrester can be reduced in size and weight can be obtained.

The pressure spring is arranged between the electrode on the side where the end of the insulating rod is fastened by the two nuts and the zinc oxide element block, and the outer diameter thereof is smaller than the outer diameter of the zinc oxide element. The same effects as described above can be obtained.

Claims (7)

A zinc oxide device block in which a plurality of zinc oxide devices are stacked; A pressure spring disposed on one end surface of the zinc oxide element block; A pair of electrodes disposed on both sides of the zinc oxide element block and the pressure spring in series; A zinc oxide device module is configured by a plurality of insulating rods attaching both ends to the pair of electrodes to fasten the pair of electrodes, In an arrester in which an outer shell is molded by an insulating material around the zinc oxide element module, The pair of electrodes each have a flange portion on the side opposite to the series body, Fastening of the insulating rod and the pair of electrodes is fastened at each flange portion of the side surface of the series body of the insulating rod and the pair of electrodes, In the flange portions of the pair of electrodes, attachment holes for inserting the insulating rod are formed, respectively. One end side of the insulating rod is inserted into an attachment hole of one of the flange portions of the pair of electrodes and fastened with a nut at both sides of the attachment hole, The other end side of the insulating rod is inserted into the attachment hole of the other flange portion and fastened with a nut from the side of the semi-serial body, and the insulating rods are fixed to the respective flange portions, An element receiving portion having an outer diameter portion smaller than an outer diameter of the zinc oxide element on a side opposite to the series body of the flange portion of the one electrode fastened with a nut on both sides of the attachment hole, and having an outer diameter of the zinc oxide element. The difference between the outer diameter portion of the element receiving portion is greater than the difference between the outer diameter of the nut of the insulating rod and the outer diameter of the insulating rod on the side opposite to the series body of the flange portion of the one electrode, and the insulating rod is An arrester, which is brought into contact with the zinc oxide element block. delete delete A zinc oxide device block in which a plurality of zinc oxide devices are stacked; A pressure spring disposed on one end surface of the zinc oxide element block; A pair of electrodes disposed on both sides of the zinc oxide element block and the pressure spring in series; A zinc oxide device module is configured by a plurality of insulating rods attaching both ends to the pair of electrodes to fasten the pair of electrodes, In an arrester in which an outer shell is molded by an insulating material around the zinc oxide element module, The pair of electrodes each have a flange portion on the side opposite to the series body, Fastening of the insulating rod and the pair of electrodes is fastened at each flange portion of the side surface of the series body of the insulating rod and the pair of electrodes, In the flange portions of the pair of electrodes, attachment holes for inserting the insulating rod are formed, respectively. One end side of the insulating rod is inserted into an attachment hole of one of the flange portions of the pair of electrodes and fastened with a nut at both sides of the attachment hole, The other end side of the insulating rod is inserted into the attachment hole of the other flange portion and fastened with a nut from the side of the semi-serial body, and the insulating rods are fixed to the respective flange portions, The pressure spring is disposed between the flange portion of the one electrode and the zinc oxide element block fastened with a nut at both sides of the attachment hole, and the outer diameter of the pressure spring is smaller than the outer diameter of the zinc oxide element. The difference between the outer diameter of the zinc oxide element and the outer diameter of the pressure spring is made larger than the difference between the outer diameter of the nut of the insulating rod and the outer diameter of the insulating rod on the side opposite to the series body of the flange portion of the one electrode, And the insulating rod is brought into contact with the zinc oxide element block. delete The method according to claim 1 or 4, The pair of electrodes each has a two-stage flange portion, The fastening of the insulating rod and the pair of electrodes is fastened at each flange portion on the side of the series body of the insulating rod and the pair of electrodes. The method of claim 6, Lightning arrester, characterized in that the pair of electrodes have the same shape.

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