JPH0229624Y2 - - Google Patents

Description

[Detailed description of the invention] [1] Technical field The present invention relates to an insulator with a built-in lightning arrester that houses a lightning arrester in the insulator body to prevent, for example, insulation breakdown of a distribution transformer from abnormal voltage caused by lightning. In particular, in order to make it possible to replace the lightning arrester and to facilitate the installation work of the primary insulated wire of the distribution transformer, the clamp fittings and the mounting fittings are made removable from the insulator body, and the insulated The present invention relates to an insulator with a built-in lightning arrester, in which the clamp fitting is provided with current collecting teeth that can bite into the insulating coating layer of the electric wire.

[2] Background Art Generally, as shown in FIG. 1, a utility pole that supports an overhead power distribution line has an arm 2 and an arm 3 installed above the utility pole 1, and a high-voltage arm attached to the arm 2. Pin insulator 4 that supports overhead distribution lines made of insulated wires
, an upper support insulator 6 such as a pin insulator that supports the high voltage underline 5 made of a high voltage insulated wire attached to the cross arm 2 and connected to an overhead distribution line, and an upper support insulator 6 such as a pin insulator that is attached to the arm 3 and supports the high voltage underline 5. a lower support insulator 7 such as a pin insulator, a high voltage cutout 8 attached to the cross arm 3 to cut off an overcurrent flowing through the high voltage underline 5, and a high voltage cutout 8 placed on the cross arm 3.
A distribution transformer 9 is mounted on the pole to step down the primary voltage applied via the support insulator 10 (via the high voltage side electric wire 130 supported by the support insulator 10) and supply power to the consumer.

In order to prevent dielectric breakdown of the transformer 9 from abnormal voltage caused by lightning, a lightning arrester made of ZnO or the like is built into the transformer 9, or a lightning arrester is built into the high-voltage cutout 8 as a means of protection on the primary side. Various proposals have been made, but all of them increase the size of the transformer 9, high-voltage cutout 8, etc., and may cause inconvenience in handling.

In addition, in order to prevent high-voltage insulated wires from melting due to lightning surges or arc currents caused by galvanic current, the applicants previously proposed an insulator body having a hollow portion inside and an insulator body attached to the upper end of the insulator body. A clamp fitting that supports the primary insulated wire of a distribution transformer;
A mounting metal fitting fixed to the lower end of the insulator body and fixing the insulator body to a grounded support member; and a ZnO etc. housed in the hollow part of the insulator body and electrically connected between the clamp metal fitting and the mounting metal fitting. We proposed an insulator with a built-in surge arrester, which consists of a surge arrester and a surge arrester. In this type of insulator with a built-in lightning arrester, the lightning arrester and the insulator are integrated, so that it is possible to simplify the pole mounting parts and the pole mounting work. However, because some of the clamp fittings and mounting fittings are cemented to the insulator body, it is not possible to replace the lightning arrester, and when supporting high-voltage insulated wires with the clamp fittings, high-voltage insulation is required over a specified length. Since the wire is clamped with clamp fittings after the insulation coating is stripped off, there is a risk that workability will be poor.

Also, Utility Application No. 54-55830 (Utility Application No. 55-156370)
No. 1) shows an electrical connection clamp having an elastic connecting band with a cutting edge that bites into the insulated wire, but when the insulated wire moves within the clamp due to tension after being clamped, the cutting edge cuts into the insulator. Since the biting hole is enlarged and the cutting edge slides along the wire conductor, the cutting edge is damaged and the reliability of the electrical contact is reduced.

[3] Purpose and structure of the invention The present invention has been made in view of the above, and it enables the replacement of lightning arresters, facilitates the work of installing the primary insulated wires of distribution transformers, and prevents the insulated wires from being exposed to overhead wire tension. In order to prevent damage to the cutting edge and deterioration of the reliability of the clamp connection even when the insulator is moved, the clamp fittings and mounting fittings are made removable from the insulator body, and furthermore, they are made so that they can be caught in the insulator of the insulated wire. The present invention provides an insulator with a built-in lightning arrester in which current collector teeth are movable in the length direction of an insulated wire and incorporated into a clamp fitting.

[4] Embodiment The insulator with built-in lightning arrester according to the present invention will be described in detail below.

2 and 3A and 3B show an insulator with a built-in lightning arrester to which the present invention is applied. This insulator with a built-in lightning arrester 100 has a hollow part 101a in the upper end and a through hole 101b in the lower end. An insulator body 101 each having an opening 101c and a recess 1 on the top surface.
Bolts 102d and 102e are provided protruding from the upper and lower surfaces of the flange 102c having 02a and 102b, and the lower bolt 102e is inserted into the through hole 101b and tightened with a nut 104 via a flat washer 103 to be fixed to the upper end of the insulator body 101. holder 102
, a flat packing 105 and an O-ring 106 that are interposed between the upper end surface of the insulator body 101 and the lower surface of the flange portion 102c to seal the gap between them, and the lower part of the through hole 101b and the upper surface of the flat washer 103. There is a flat packing 107 intervening and sealing the gap, and a recess 1 on the bottom surface.
08a and a convex portion 108b, a current collecting tooth 108c is protruded into the concave portion 108a, and a ring-shaped holding fitting 108 is attached to the outer periphery of the upper bolt 102d of the receiving fitting 102, and a disc spring washer 109 is attached from above the upper bolt 102d. A nut 110 that tightens the presser fitting 108 through the insulator body 101 for waterproofing.
A cover 111 made of polyethylene, rubber, etc. is placed up to the vicinity of the first fold at the top of the insulator body 101, and a cushioning gasket 112 is provided on the outer peripheral surface of the lower part of the insulator body 101.
A receiving metal fitting 114 that is removably fitted to the insulator body 101 to close the opening 101c of the insulator body 101 via a waterproof flat packing 113, and a cross arm or the like that protrudes from the receiving metal fitting 114 and connects the insulator main body 101 to the ground. The mounting bolt 115 is fixed to the supporting member of the insulator body 10.
A receiving washer 117 is fixed between the lower end surface of the insulator body 101 and the upper surface of the receiving fitting 114 via an O-ring 116, and a receiving washer 117 is housed in the hollow portion 101a of the insulator body 101 so as not to contact the inner circumferential surface of the insulator body 101. A lightning arrester element 120 made of ZnO placed on the lightning arrester element 117, a pair of upper and lower gap balls 122, 122 placed on the lightning arrester element 120 and forming a predetermined discharge gap via a gap spacer 121, and the upper gap ball 1.
22 and a spring 124 stretched between a spring receiver 123 placed on the upper bracket 102 and a flat washer 103 attached to the upper bracket 102. The receiving fitting 102 and holding fitting 108 attached to the upper end of the insulator body 101 constitute a clamping fitting that supports the primary insulated wire of the distribution transformer, and the receiving fitting fixed to the lower end of the insulator main body 101. The metal fittings 114 and the mounting bolts 115 constitute a mounting metal fitting for fixing the insulator body 101 to the support member, and furthermore, the hollow part 10 of the insulator body 101
The lightning arrester 120, the gap spacer 121, and the gap balls 122, 122 housed in the lightning arrester 1a constitute a lightning arrester.

In order to assemble the insulator 100 with a built-in lightning arrester in the above configuration, first, the lower bolt 102e of the bracket 102 is inserted into the upper end through hole 101b of the insulator body 101.
is inserted and tightened with a nut 104 to fix the receiving fitting 102 to the upper end of the insulator body 101. Next, the lower end opening 101 of the insulator body 101
Insert the spring 124, gap ball 122, lightning arrester 120, etc. in sequence from c to the lightning arrester 120.
While pressing with the receiving washer 117 on which the flat packing 113 and the O-ring 116 are mounted, and the receiving fitting 114,
The receiving fitting 114 is fitted to the outer periphery of the lower end of the insulator body 101 via the packing 112. After that, the holding fitting 10 is attached to the upper bolt 102d of the receiving fitting 102.
8 and nut 110 etc. Then, the receiving fitting 102, the holding fitting 108, the nut 104, the spring 124, and the pair of gap balls 122, 12
2. Lightning arrester element 120, receiving washer 117, receiving fitting 11
4, and the grounded mounting bolt 115 form an electrical series discharge loop.

In order to attach such an insulator 100 with a built-in lightning arrester to a utility pole 1 as shown in FIG. 100 mounting bolts 115 are fixed. And an insulated wire 13 connecting between the high voltage cutout 3 and the primary side of the transformer 9
0 in the recess 102a of the receiving metal fitting 102,
If the nut 110 is tightened and the presser metal fitting 108 is pushed down, the receiving metal fitting 1 will open as shown in FIG.
The convex portion 1 of the presser metal fitting 108 is inserted into the concave portion 102b of 02.
08b is inserted and the two engage, and the current collector tooth 108c in the recess 108a of the presser metal fitting 108
The insulated wire 130 is caught in the insulating coating layer 130a of the insulated wire 130 and reaches the conductor 130b, and the insulated wire 130 is easily held between the receiving metal fitting 102 and the holding metal fitting 108. Thereafter, the cover 111 is placed over the insulator body 101, the gap between the cover 111 and the insulated wire 130 is sealed with waterproof tape, etc., and a waterproofing means is applied to complete the installation work.

Since this insulator 100 is disposed near the primary side of the transformer 9, extremely good lightning protection characteristics can be obtained, and the wiring between the primary side of the transformer 9 and the high voltage cutout 8 can be prevented from slackening. It is possible to prevent the wiring condition around the transformer from becoming complicated due to such factors. In addition, the insulated wire 130 and the discharge loop are the insulated wire 130 and the discharge loop.
Since the connection can be easily made by simply engaging the current collecting teeth 108c, work efficiency is improved. Furthermore, the receiving metal fitting 114 is connected to the insulator body 1 through the packing 112.
Since it is removably attached to the lower end of the lightning arrester, if the lightning arrester breaks down due to deterioration or the like, it can be easily replaced with a new one. Moreover, the receiving fitting 114 includes gaskets 112, 113 and O-ring 1.
Since it is fitted to the lower end of the insulator body 101 via the insulator body 101, it has the advantage of being excellent in waterproofness.

FIG. 4 shows another structure of the current collector tooth 108c and the insulated wire 130, and as shown in the figure, the current collector tooth 108c
The conductor 130b of the insulated wire 130 may not come into contact with the conductor 130b of the insulated wire 130. This non-contact state results in insulation between the two, but when abnormal voltage due to lightning enters the conductor 130b, it is applied to the discharge loop via the current collecting teeth 108c, and the gap bulb 122, 122 starts a spark discharge, a discharge current flows to the ground via the lightning arrester 120, the peak value of the abnormal voltage is reduced, thereby preventing dielectric breakdown of the transformer 9, and a follow-up current flows after the discharge ends. has the advantage of being blocked. Moreover, if the current collector teeth 108c and the conductor 130b of the insulated wire 130 are always kept non-contact, the gap balls 122, 122
The length of the discharge gap between the two can be shortened or the discharge gap can be omitted, which has the advantage of making the lightning arrester more compact and also has an excellent waterproof effect. In addition,
The current collector tooth 108c is located in the recess 102a of the receiving metal fitting 102.
It may be made to protrude inside or from both the recess 108a of the presser metal fitting 108 and the recess 102a of the receiving metal fitting 102.

FIGS. 5A, 5B, 5C, and 5D show embodiments of the present invention that can be applied to the above-described insulator with a built-in lightning arrester, and are characterized by a holding metal fitting that is a component of the clamping metal fitting. The presser metal fitting 208 includes a rectangular metal fitting body 208a, a bolt insertion hole 208a drilled approximately at the center of the metal fitting body 208a, a recess 208c for inserting an insulated wire provided on the lower surface of the metal fitting body 208a, and a hole 208a for inserting a bolt into the metal fitting body 208a. A convex portion 208d inserted into the concave portion 102b of the receiving fitting 102, a hole 208e for inserting a mounting screw passing through the concave portion 208c, and a hole 208e.
The upper recess 208f provided at the upper end of the hole 20
8e, a lower recess 208g provided at the lower end of the recess 208c, an uneven electric wire gripping portion 208h formed on the inner surface of the recess 208c to increase the wire gripping force, and a sliding gap 208i inside the lower recess 208g. A current collecting tooth mount 210 in which the current collecting tooth 209 to be mounted is implanted is engaged with the bottom surface of the upper recess 208f via an elastic seat plate 211, and the current collecting tooth is slidably inserted into the hole 208e. It is composed of a mounting screw 212 that fixes the mounting base 210.

In the above configuration, the current collector tooth mounting base 210 of the presser metal fitting 208 is attached to the mounting screw 2 through the seat plate 211.
12, a gap 208 is formed in the lower recess 208g.
It is slidably mounted so that it can be easily moved by a length i. And this presser metal fitting 208 and the receiving metal fitting 10
When the insulated wire 130 is held between the wires 2 and 2 and the nut 110 is tightened through the washer 109, the current collecting teeth 209 bite into the insulated wire 130 and come into electrical contact with the conductor 130b. When tension is applied to the insulated wire 130 while the insulated wire 130 is fastened and fixed in this manner, the pressure contact friction of the wire gripping portion 208h allows it to withstand a tensile load that is less than the frictional drag. Furthermore, the insulated wire 130 will slip if the tension exceeds this, but the current collector tooth mount 2
10 slides smoothly within the lower recess 208g by the length of the gap 208i, so even if the insulated wire 130 slips to a certain extent, no slipping occurs at the contact point between the current collector tooth 209 and the conductor 130b, and the electrical The reliability of the contact state can be improved.

FIG. 6 shows the airtight structure of the insulator body 101 and the receiving metal fitting 114. This structure consists of two cylindrical waterproof gaskets.
A receiving member 217 for mounting the lightning arrester 120 is inserted into the lightning arrester 13 , and the insertion end thereof is tightened and fixed to a packing receiving member 219 with a screw 218 . After fitting the lightning arrester 120 inside the waterproof gasket 213 on the receiving member side and inserting it into the insulator body 101, the receiving metal fitting 114 is inserted into the lower end of the insulator body 101 via the gasket 112, and the gasket is received. The member 219 is pressed and fixed. Here, the reason why the lightning arrester element 120 is fitted into the waterproof packing 213 is to position the lightning arrester element 120 at the center with respect to the insulator body 101. In addition, the waterproof gasket 213 is made large enough to cope with changes in the inner diameter of the hollow portion 101a of the insulator body 101, and is always kept in close contact with the inner wall of the insulator body 101 and the receiving member 217. to provide waterproof function. In the above configuration, since the waterproof gasket 213 is provided, not only does the waterproof performance not deteriorate due to the movement of the receiving metal fitting 114, but also because the volume of the waterproof gasket 213 is increased, the hollow part of the insulator body 101 is Waterproof performance can be maintained by absorbing variations in internal diameter dimensions.

FIG. 7 is an external view of an insulator with a built-in lightning arrester to which the present invention is applied. This insulator 100' is different from the one in FIG. 2 in that the insulator 100 in FIG. The insulated wire 130 is supported such that one side of the insulated wire 130 protrudes from the upper end of the main body 101. 100' of such insulators,
For example, if it is provided in place of the lower support insulator 7 shown in FIG. 1, there is an advantage that not only the high-voltage drawing underline work is simplified, but also the number of insulators can be reduced.

Figure 8 shows the insulator 100 with a built-in lightning arrester of the present invention as described above mounted on a pole, and by placing it in the pole mounting space shown in Figure 1, it can be installed without spoiling the aesthetic appearance. . In particular, since the lightning arrester is located closest to the transformer 9, a good lightning protection effect can be obtained.

[5] Effects of the invention As explained above, according to the insulator with a built-in lightning arrester of the present invention, the clamp fitting and the mounting fitting can be removed from the insulator body, and furthermore, the insulator with a built-in lightning arrester can be attached to the insulator of the insulated wire. The current collector teeth are movable in the length direction of the insulated wire and incorporated into the clamp fitting, making it possible to replace the lightning arrester.
This facilitates the installation work of the primary insulated wire of the distribution transformer, prevents damage to the teeth even if the insulated wire moves due to the tension of the overhead wire, and prevents the reliability of the clamp connection from deteriorating.

[Brief explanation of the drawing]

Figure 1 is a general installation diagram of a pole, Figure 2 is an external view of an insulator with a built-in lightning arrester to which the present invention is applied, Figure 3 is
B is a vertical cross-sectional view of FIG. 2 and a partially enlarged view of the clamp fitting, FIG. 4 is a partially enlarged view of a clamp fitting of another structure, and FIGS. 5 A, B, C, and D show an embodiment of the present invention. 6 is a sectional view of the lower end of the insulator with built-in lightning arrester of the present invention, and FIG. 7 is a lightning arrester to which the present invention is applied. Fig. 8 is an external view of the built-in insulator, and is a view of the column installation state when the present invention is applied. Explanation of symbols, 1... Telephone pole, 3... Bracelet, 5...
High voltage underline, 7... Lower support insulator, 8... High voltage cutout, 9... Distribution transformer, 100, 10
0'...Insulator with built-in lightning arrester, 101...Insulator body,
101a...Hollow part, 101b...Through hole, 10
1c...Opening, 102...Bracket, 102a...
...Concavity, 102c...Flame, 102d, 102e
... Bolt part, 104 ... Nut, 108,20
8... Presser metal fitting, 108a, 208c... recessed part,
108c, 209... Current collector tooth, 110... Nut, 111... Cover, 112, 113, 213
...Packskin, 114...Bracket fitting, 115...Mounting bolt, 117...Batch washer, 120...Lightning arrester element, 121...Gear spacer, 122...
Gap ball, 124... Spring, 130...
Insulated wire, 130a...Insulating coating layer, 130b...
...Conductor, 208...Press fitting, 208a...Metal fitting body, 208b...Bolt insertion hole, 208c...
Recess, 208d... Protrusion, 208e... Screw insertion hole, 208f... Upper recess, 208g... Lower recess, 208h... Electric wire gripping part, 209... Current collector tooth, 210... Current collector tooth mounting base , 211... washer,
212...Mounting screw, 217...Receiving member.

Claims (1)

[Claims for Utility Model Registration] An insulator body having a hollow portion inside, a clamp fitting for supporting an insulated wire attached to the upper end of the insulator body, and a clamp fitting fixed to the lower end of the insulator body to support the insulator body. A mounting bracket that is fixed to a grounded support member, and an electrical connection between the clamp bracket and the mounting bracket that are housed in the hollow part of the insulator body.
a lightning arrester having a lightning arrester element made of ZnO or the like; the clamp fitting includes a removable receiving fitting that is hermetically fixed to the upper end of the insulator body; a holding metal fitting that holds the electric wire; and an insulating coating layer of the insulated wire, which is provided protruding from the inner surface of one metal fitting selected from the receiving metal fitting and the holding metal fitting, and when the insulated electric wire is held between the receiving metal fitting and the holding metal fitting. The one metal fitting accommodates the current collector tooth mount and adjusts the length of the current collector tooth mount based on the tension of the insulated wire. The mounting fitting includes a removable receiving fitting that is sealed and fixed to the lower end of the insulator body, and the supporting member fixed to the receiving fitting. An insulator with a built-in lightning arrester characterized by being composed of a mounting bolt that is fixed.