JPH0722075Y2 - Lightning arrester - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention, when a lightning surge current flows through a transmission line, discharges it immediately to the ground, and suppresses and interrupts the subsequent current that occurs thereafter. It relates to lightning protection insulators that can be used.

[Prior Art] As a conventional lightning protection insulator of this type, for example, a structure having a configuration as shown in FIGS. 4 and 5 is known.

That is, a current limiting element having a non-linear voltage-current characteristic inside
A ground-side electrode 11 is attached to the upper end of a pressure-resistant insulating cylinder 9 accommodating 10, and a mounting flange 11a is provided at the center of the outer periphery of the ground-side electrode 11, and a terminal is provided at the tip of the ground-side electrode 11. The metal fitting 20 is provided so as to project upward. And
When the lightning protection insulator 7 is mounted on the mounting adapter 6 extending from the support arm of the tower body, the grounding side electrode 11 is inserted through the insertion hole 38 provided in the mounting adapter 6 and mounted by the plurality of bolts 13. The flange portion 11a for fixing is fixed to the lower surface of the mounting adapter 6, and in this state, the connecting metal fitting 39 is attached to the upper end of the terminal metal fitting 20, and the connecting conductor 24 is attached between the connecting metal fitting 39 and the mounting adapter 6. The terminal fitting 20 and the mounting adapter 6 were electrically connected.

[Problems to be Solved by the Invention] However, in this conventional lightning protection insulator, the ground-side electrode
Since the mounting flange 11a is provided at the center of the outer periphery of the terminal 11, and the terminal fitting 20 is provided at the tip of the ground side electrode 11 so as to project upward, the mounting adapter 6 has a ground side electrode. Since it is necessary to form an insertion hole 38 for inserting the 11 and the terminal fitting 20, the processing is very troublesome, and the connecting fitting 39 and the connection for electrically connecting the terminal fitting 20 and the mounting adapter 6 are formed. Conductor 24 etc. is the mounting adapter 6
There was a problem that it was exposed on the surface of the slab and spoiled the aesthetics of the pillar.

The present invention has been made by paying attention to the problems existing in such a conventional technique, and its purpose is to provide a mounting adapter with an insertion hole for inserting the ground electrode and the terminal fitting. It is not necessary to form it, and its processing can be easily performed, and the pillar can be beautified without exposing the connection conductor or the like for electrically connecting the terminal fitting and the mounting adapter to the surface of the mounting adapter. To provide lightning protection insulators. Further, the object of the present invention is to ensure the electrical connection between the current limiting element and the terminal fitting, and to easily perform the electrical connection work between the conductive rod and the terminal fitting. An object of the present invention is to provide a lightning protection insulator capable of stably fixing the lightning protection to the side wall of the ground side electrode.

[Means for Solving the Problems] In order to achieve the above object, in the lightning arrester of the present invention, a current limiting element having a non-linear voltage-current characteristic is housed inside, and a ground side and In a lightning protection insulator provided with an electrode on the power-supply side, a mounting portion for a mounting adapter is provided at the edge of the ground electrode, and a supporting cylinder is fitted on the peripheral wall of the ground electrode and mounted on this supporting cylinder. The terminal metal fittings for electrical connection to the adapter are supported through, the conductive rods that contact the current limiting element and the terminal metal fittings are crossed, and the ends of each crossing are electrically connected by bolts. Through connection, a through hole for rotating the bolt is formed on the side wall of the ground electrode at a position facing the bolt, and a supporting cylinder and a terminal fitting are molded with an insulating jacket.

[Operation] According to the lightning protection insulator configured as described above, since the terminal fitting is provided on the circumferential side of the ground side electrode, the mounting adapter has an insertion hole for inserting the ground side electrode and the terminal fitting. It is not necessary to form it, and the mounting portion provided at the edge of the ground electrode can be fixed in a state of being brought into contact with the mounting adapter. Further, the electric connection between the terminal fitting and the mounting adapter can be made on the side of the lightning protection insulator, and the connecting conductor and the like are not exposed at all on the surface of the mounting adapter, so that the pillar can be beautified. In addition, the present invention can surely make the electrical connection between the current limiting element and the terminal fitting, and can easily perform the electrical connection work between the conductive rod and the terminal fitting, and further ground the terminal fitting. It can be stably fixed to the side wall of the side electrode.

[Embodiment] An embodiment of the lightning protection insulator device embodying the present invention will be described below in detail with reference to FIGS. 1 to 3.

As shown in FIG. 3, at the tip of the support arm 1 of the tower body, a transmission line support insulator 2 composed of a long insulator is provided with a plurality of bolts 3.
The power transmission line 5 is supported by the electric wire clamp 4 at its lower end. A mounting adapter 6 is fixed to the tip of the support arm 1 and extends horizontally in the direction orthogonal to the line direction. Then, the lightning protection insulator 7 is attached to the lower part of the tip of the mounting adapter 6 in a suspended state.

As shown in FIGS. 1 and 2, the lightning protection insulator 7 is provided with a pressure resistant insulating cylinder 9 made of reinforced synthetic resin (FRP), and a plurality of pressure release holes 9a are formed in the peripheral wall thereof. Inside the withstand voltage insulating cylinder 9, a current limiting element 10 mainly made of zinc oxide (ZnO) having a non-linear voltage-current characteristic is housed in a laminated state. Further, the ground side electrode 11 and the voltage application side electrode 12 are fitted and fixed to the upper and lower end portions of the withstand voltage insulating cylinder 9. A mounting flange portion 11a as a mounting portion is formed on the outer peripheral edge of the upper end of the ground-side electrode 11, and with the mounting flange portion 11a abutting the lower surface of the mounting adapter 6, a plurality of bolts 13 are used to protect the lightning arrester. 7 is fixed to the mounting adapter 6.

In the withstand voltage insulating cylinder 9, a current-carrying side metal fitting 14 is interposed between the lower end of the current limiting element 10 and the voltage-carrying side electrode 12. In the withstand voltage insulating cylinder 9, a ground-side conductive metal fitting 15 is joined and arranged on the upper end portion of the current limiting element 10 via a conductive plate 16, and a conductive rod 15a is projectingly provided on the upper portion thereof. Corresponding to the ground-side conductor fitting 15, a spring receiver 17 is movably arranged in the pressure-proof insulating cylinder 9 by a tightening ring 18, and the conductive rod 15a is projected upward through a center hole thereof. There is. A coil spring 19 is interposed between the grounded-side conductor fitting 15 and the spring receiver 17, and the coil spring 19 limits the current-limiting element.
10 is pressed and fixed between the conductor fittings 14 and 15.

A terminal fitting 20 is penetratingly supported on a peripheral wall of the ground-side electrode 11 via a support cylinder 21, and an inner end portion of the terminal fitting 20 is penetrated by a conductive rod 15a. Between the upper end portion of the conductive rod 15a and the inner end portion of the terminal fitting 20, a side face approximately L-shaped connecting plate 22 is attached by a bolt 23, and the conductive rod 15a and the terminal fitting are connected via the connecting plate 22. 20 is electrically connected. Between the outer end portion of the terminal fitting 20 and the lower surface of the mounting adapter 6, a side surface substantially L-shaped connecting conductor 24 is mounted by a bolt 25, and the terminal fitting 20 and the mounting adapter 6 are connected via the connecting conductor 24. And are electrically connected. A through hole 26 for tightening the lateral bolt 23 is formed in the peripheral wall of the ground electrode 11 facing the support cylinder 21, and is closed by a plug 27.

An insulating jacket made of rubber or the like is provided on the outer periphery of the pressure-proof insulating cylinder 9.
28 is molded and has multiple insulation folds 28a on its outer surface.
Is provided. When the insulating jacket 28 is molded, the gap between the inner peripheral surface of the pressure-proof insulating cylinder 9 and the outer peripheral surface of the current limiting element 10 and the inside of the ground side electrode 11 are passed through the pressure release hole 9a of the pressure-proof insulating cylinder 9. A rubber or the like is injected as an insulating filling material 29. Further, in the mold of the insulating jacket 28, an insulating jacket 30 made of rubber or the like is also formed outside the base of the terminal fitting 20.

As shown in FIG. 3, a grounding-side arcing ring 32 is attached to the lower surface of the attachment adapter 6 so as to correspond to the ground-side electrode 11 of the lightning protection insulator 7. A mounting bracket 33 is provided so as to project from the voltage-applying side electrode 12 of the lightning protection insulator 7, and an arcing ring 34 on the voltage-applying side is mounted on the mounting bracket 33. And, this grounding side and the charging side arcing ring 32,3
By 4, the damage of the insulating mantle 28 at the time of a surface flashover is reduced.

A horn-shaped discharge electrode 35 on the charging side is attached to the electric wire clamp 4 of the support insulator 2 via an attachment body 36. Further, a horn-shaped grounding-side discharge electrode 37 is attached to the attachment fitting 33 on the charge-side electrode 12 on the side of the lightning protection insulator 7. The discharge parts of the discharge electrodes 35 and 37 on the charging side and the grounding side are arranged opposite to each other with a predetermined air discharge gap G.

Next, the operation of the lightning arrester device configured as described above will be described.

Now, in this lightning arrester device, when a surge current caused by a lightning strike is applied to the transmission line 5, the lightning surge current is discharged in the air discharge gap G between the discharge electrodes 35 and 37, and the lightning insulator 7 It reaches the voltage application side electrode 12. This lightning surge current is transmitted from the power-supply-side electrode 12 to the power-supply-side conductor fitting 14 and the current-limiting element.
10, the conductive plate 16, the ground-side conductor fitting 15, the connection plate 22, the terminal fitting 20, and the connection conductor 24 flow to the mounting adapter 6, and are discharged from the tower body to the ground via the support arm 1. Further, the subsequent current generated thereafter is suppressed and blocked by the air discharge gap G between the discharge electrodes 35 and 37 and the current limiting element 10 in the lightning protection insulator 7.

By the way, in the lightning protection insulator of this embodiment, the mounting flange portion 11a for the mounting adapter 6 is provided at the upper end edge of the ground side electrode 11 as described above, and the terminal metal fitting 20 for electrically connecting to the mounting adapter 6 is provided. Since it is provided so as to project on the peripheral side of the ground electrode 11, the insertion hole 38 for inserting the ground electrode 11 and the terminal fitting 20 into the mounting adapter 6 as in the conventional configuration shown in FIGS. 4 and 5. The lightning protection insulator 7 can be mounted by simply contacting the mounting flange portion 11a at the upper edge of the ground electrode 11 with the lower surface of the mounting adapter 6 without the need to form It can be mounted on the adapter 6, and the mounting work can be easily performed. Further, the electrical connection between the terminal fitting 20 and the mounting adapter 6 can be made on the side of the lightning protection insulator 7, and the connection conductor 24, the bolt 25, etc. are not exposed at all on the surface of the mounting adapter 6, and the pillar is beautified. be able to.

In the above embodiment, the conductive rod 15a contacting the current limiting element 10 and the terminal fitting 20 are crossed, and the ends of each crossing portion are electrically connected by the connection plate 22 fixed by the bolt 23. Flow element
The electrical connection between the 10 and the terminal fitting 20 can be surely made.

In the embodiment, the through hole 26 for rotating the bolt 23 is formed on the side wall of the ground electrode 11 at a position facing the bolt 23, so that the through hole 26 can tighten the bolt 23 with a box spanner or the like. The electrical connection work between the conductive rod 15a and the terminal fitting 20 can be easily performed.

Further, in the above-described embodiment, the support cylinder 21 is fitted to the peripheral wall of the grounding side electrode 11, the terminal fitting 20 is pierced and supported by the support cylinder 21, and the supporting cylinder 21 and the terminal fitting 20 are molded with the insulating jacket 30. Therefore, the terminal fitting 20 can be stably fixed to the peripheral wall of the ground-side electrode 11.

[Effect of the Invention] Since the present invention is configured as described above,
Since it is not necessary to form an insertion hole for inserting the grounding side electrode and the terminal fitting in the mounting adapter, the processing can be easily performed, and a connecting conductor or the like for electrically connecting the terminal fitting and the mounting adapter is provided. This has an excellent effect that the pillar can be beautified without being exposed on the surface of the mounting adapter.

Further, the present invention can surely perform the electrical connection between the current limiting element and the terminal fitting, and also facilitate the electrical connection work between the conductive rod and the terminal fitting. It can be stably fixed to the peripheral wall of the electrode.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a grounding side end showing an embodiment of a lightning protection insulator embodying the present invention, FIG. 2 is a partial cross-sectional view of the same side of the lightning protection insulator, and FIG. FIG. 4 is a front view showing the entire insulator device, FIG. 4 is a partial front view showing a mounting structure of a conventional lightning protection insulator, and FIG. 5 is a partial plan view of the same. 7 ... Lightning protection insulator, 10 ... Current limiting element, 11 ... Grounding side electrode, 11a ...
Flange for mounting as a mounting part, 12 ... Power-supply side electrode, 15
a ... ground side conductive rod, 20 ... terminal fitting, 21 ... support tube, 22 ...
Connection plate, 23 ... Bolt, 24 ... Connection conductor, 26 ... Through hole, 30 ... Insulation jacket.

Claims (1)

[Scope of utility model registration request] 1. A lightning protection insulator, wherein a current limiting element (10) having a non-linear voltage-current characteristic is housed inside, and electrodes (11, 12) on a ground side and a voltage side are provided at both ends thereof. A mounting portion (11a) for the mounting adapter (6) is provided on the edge of the ground side electrode (11), and the ground side electrode (1
A support cylinder (21) is fitted on the peripheral wall of 1), and the support cylinder (21)
The conductive rod (15) that penetrates the terminal fitting (20) for electrically connecting to the mounting adapter (6) and contacts the current limiting element (10).
a) and the terminal metal fitting (20) are crossed, and each end of the crossing is electrically connected by a connection plate (22) fixed by a bolt (23), and a bolt for rotating the bolt 23 is operated. A through hole (26) is formed in a side wall of the ground electrode (11) at a position facing the bolt (23), and a support cylinder (21) and a terminal fitting (20) are molded with an insulating jacket (30). Lightning arrester characterized by that.