JPH0416596Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a structure for attaching a gear press arrester to an air termination of a cable.

(Technical background of the invention and its problems) A gapped arrester is installed in parallel at the aerial termination of a power cable in order to prevent dielectric breakdown of the termination or the cable due to lightning surges, etc.

By the way, since a gapped arrester has a discharge gap portion, if it is placed near the aerial termination of the cable, the potential distribution of the insulator at the termination will become non-uniform. For this reason, in the past, a gapped arrester was provided at a position a certain distance away from the air termination. However, if the gapped arrester is provided at a remote location in this way, a very large installation space will be required.

Therefore, the present inventors focused on the fact that when using a gear press arrester having a zinc oxide element, etc., it is possible to divide the power transmission voltage almost equally in each element. We have found a structure that can be directly attached to the air termination to enable DC withstand pressure tests.

(Purpose of the invention) In other words, the purpose of the invention is to create a mounting structure for the gear press arrester that allows the gear press arrester to be directly attached to the cable end in order to reduce the installation space, and also to enable DC withstand voltage tests. It is about providing.

(Summary of the invention) The present invention removably connects the connecting terminal protruding from the upper end of the gear press arrester to the conductor pull-out rod at the aerial end of the cable using a conductive connector, and the lower part of the gear press arrester It is characterized in that it is swingably attached to a bracket attached to the lower part of the cable's aerial termination via a joining member.

(Embodiments of the invention) Hereinafter, embodiments of the invention will be described in detail with reference to the drawings.

The drawing shows a structure in which a gear press arrester 23 is attached to the air termination 1 of the OF cable. That is, this air termination part 1 includes an insulator tube 2, and an insulator tube upper metal fitting 2A is fixed to the upper circumferential surface of the insulator tube 2 via cement. An upper metal fitting 3 is airtightly secured to the upper end surface of the insulator tube 2 via a packing 4, and the upper metal fitting 3 is bolted to the insulator tube upper metal fitting 2A. A conductor pull-out rod 5 passes through the upper metal fitting 3 in the vertical direction, and the upper metal fitting 3 of the conductor pull-out rod 5
An O-ring 6 is attached to the upper circumferential surface. The O-ring 6 is pressed by a fastening fitting 7 bolted to the upper fitting 3. The upper metal fitting 3 is covered with an upper cover 8, from which the upper end of the conductor pull-out rod 5 projects through a packing 9.

A mounting bracket 10 is fixed to the lower peripheral surface of the insulator pipe 2 via cement, and a bracket 11 is bolted to the mounting bracket 10. This bracket 1
1 is hermetically secured to the lower end surface of the insulator tube 2 via a packing 12, and its lower surface is supported via supporting insulators 13, 13 on a stand (not shown). The terminal of the OF cable 14 is inserted into the insulator tube 1,
A cable conductor 14a exposed from the terminal of the cable 14 is connected to a conductor pull-out rod 5. An epoxy seat 15 is bolted to the bracket 11, and the epoxy seat 15 extends into the insulator tube 2, covering the insulating layer 14b of the OF cable 14. A stress cone 16 is fitted into the epoxy seat 15, and the stress cone 16 is pressed via a spring 18 whose one end is locked by a pusher 17. The other end of the spring 18 is the support tube 1
It is in contact with the inner wall of 9. The support tube 19 is covered with a protective metal fitting 20, and the protective metal fitting 20 is covered with an epoxy seat 1.
It is bolted to the flange of 5. The lower part of the protective fitting 20 and the sheath layer 14 of the OF cable 14
A waterproof tape 21 is wrapped around c.
Note that insulating oil 22 is sealed inside the insulator tube 2.

On the other hand, the gear press arrester 23 has a magnetic container 24, in which a large number of zinc oxide elements 25 are arranged along the vertical direction. The zinc oxide element 25 located at the top is pressed by a spring 27 via a conductive spacer 26.
The upper end of the spring 27 is in contact with the connection terminal 28. The upper end of this connection terminal 28 protrudes from the container 24. The zinc oxide element 25 located at the bottom is engaged with an electrode plate 29, and the electrode plate 29 is connected to a ground terminal 24a protruding from the bottom of the container 24.

Now, the gear press arrester 23 with such a configuration
is attached to the air termination part 1 as follows.
That is, a two-part annular fixing member 30 is bolted to the upper end of the conductor pull-out rod 5, and one end of a copper plate 31 is integrally connected to one half of the fixing member 30. The other end of this copper plate 31 is pivotally supported by the connection terminal 28 of the gear press arrester 23. On the other hand, the flange 2 integrally formed on the lower surface of the container 24 of the gear press arrester 23
4b is bolted to a mounting plate 32, and a half of this mounting plate 32 is locked to a stepped portion of the bracket 11. One end side of this mounting plate 32 is fixed to the bracket 11 with a fixing bolt 34,
The center of the mounting plate 32 and the end face of the bracket 11 are joined via a hinge 33 so as to be swingable.

Now, when the gear press arrester 23 is constructed from a plurality of zinc oxide elements 25 in this way, it is possible to discharge the lightning surge current that has entered each zinc oxide element 25, and also to discharge the lightning surge current that has entered the zinc oxide elements 25. can be used as a resistive element to equally divide the cable's power transmission voltage. Therefore, as described above, even when the gear press arrester 23 is disposed near the air termination portion 1, the potential distribution in the internal insulator of the air termination portion 1 is maintained uniform. Further, the connecting terminal 28 of the gear press arrester 23 is removably connected to the conductor pull-out rod 5 using a copper plate 31 and a fixing member 30, and the mounting plate 23 is swingably connected to the bracket 11 via a hinge 33. Therefore, simply remove the fixing member 30 from the conductor pull-out rod 5, pull out the fixing bolt 34, and tilt the gear press arrester 23 around the hinge 33.
More electrical isolation is possible. Therefore, the DC withstand voltage test of the air termination section 1 can be performed with good workability.

In the above embodiment, the other end of the copper plate 31 may be removably connected to the connection terminal 28.

(Effects of the invention) According to the invention, the connection terminal protruding from the upper end of the gear press arrester is removably connected to the conductor pull-out rod at the aerial end of the cable using a conductive connector, and the gear press arrester By attaching the lower part of the cable so that it can swing to the lower bracket of the cable aerial termination via a joining member, it is possible to equalize the potential distribution in the insulator at the cable aerial termination, while also making it easier to connect gears placed nearby. The press arrester prevents dielectric breakdown caused by lightning surges, etc., and allows DC withstand voltage tests of air terminals to be performed with good workability.

[Brief explanation of the drawing]

The drawing is a sectional view showing the mounting structure of the gear press arrester according to the present invention. 2... Insulator pipe, 5... Conductor pull-out rod, 11... Bracket, 23... Gear press arrester, 24...
... Container, 25 ... Zinc oxide element, 28 ... Connection terminal, 30 ... Fixing member, 31 ... Copper plate, 33 ...
Hinge.

Claims (1)

[Scope of utility model registration request] A cable aerial termination section comprising: an insulator tube in which a cable terminal is disposed; a conductor pull-out rod connected to an exposed cable conductor of the cable terminal and protruding from an upper part of the insulator tube; and a bracket attached to a lower part of the insulator tube; A conductive connector removably connects a connecting terminal protruding from the upper end of the gear press arrester disposed nearby to the protrusion of the conductor pull-out rod; 1. A gear press arrester mounting structure for an air termination of a cable, characterized in that it has a connection member that can be mounted.