JPH0632752Y2 - Insulated connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an insulating connection between a cable and a device (cable or other high voltage device).

(Prior Art) A high-voltage device or cable is usually provided with a shielding case or a metal sheath for electrical protection and safety of the high-voltage part. Both the shield case and the metal sheath are electrically connected to a ground wire for grounding.

However, for example, in a cable line that is cross-bonded or the like, the metal sheaths of the cables are connected to each other via an insulating tube to prevent a sheath current from one of the connecting portions to the other. In addition, when connecting a high voltage device such as JIS (gas insulated switch) to a high voltage cable, the shielding case and the metal sheath may also be connected via an insulating tube. This is performed in order to eliminate the influence of the sheath current when the current flowing through the high voltage cable is measured by a CT (current transformer), for example.

By the way, even if the electrical connection between the shielding case and the metal sheath is cut off in this way, it is necessary to prevent the sheath current in the normal state and to take electrical protection measures to allow the sheath current to pass when an abnormal voltage occurs. is there.

Therefore, conventionally, for this purpose, an anticorrosion layer protection device having nonlinear electrical characteristics is inserted between the shielding case and the metal sheath. The anticorrosion layer protection device is composed of, for example, a so-called gapless arrester or the like.

FIG. 2 shows a front view of an insulating connection part to which a conventional anticorrosion layer protection device is attached.

In the figure, flanges 3a and 3b are arranged between the shield case 1 of the device and the metal sheath 2 of the high-voltage cable, and the insulating cylinder 4 is sandwiched between them, and these are fastened and fixed by bolts 5 and nuts 6. ing. Further, a connection terminal 8 for electrical connection is fixed to the outer peripheral surface of the connection sleeve 7 on the cable side, and the lead wire 11 of the anticorrosion layer protection device 10 is electrically connected to the connection fitting 8 to provide the anticorrosion layer protection device. The other lead wire 12 of 10 is tightened by a bolt 5 and a nut 6 on the device side and electrically connected thereto.

Further, the anticorrosion layer protection device 10 is supported and fixed to a pedestal 13 fixed to a wall surface or the like (not shown) by using fixing metal fittings 14. The anticorrosion layer protection device 10 is made up of the gapless arrester described above, and is used as a device shielding case 1.
When a high voltage of a predetermined value or more is applied between the cable and the metal sheath 2 of the cable, the resistance value is rapidly reduced,
Allow the sheath current to pass.

(Problems to be solved by the invention) By the way, in the insulating connection portion having the above-mentioned configuration,
Since the anticorrosion layer protection device 10 is fixed on the mount 13, the length of the lead wire 12 becomes long depending on the position of the mount. However, this causes a problem that the impedance of the lead wires 11 and 12 increases and the protective effect of the gapless arrester decreases.

In order to solve this, the lead wire of the gapless arrester is bent into a short L shape, and this is directly tightened and fixed to the bolt 5 and the nut 6 provided on both sides of the insulating cylinders 3a and 3b,
A method of supporting the anticorrosion layer protection device 10 with the lead wire itself has been developed (Japanese Utility Model Publication No. 59-10901).

However, when the lead wire of the anticorrosion layer protection device 10 is subjected to bending processing, unnecessary force may be applied to the internal element, and the strength itself of the lead wire 12 is not necessarily the anticorrosion layer protection device. It was not strong enough to support the whole 10 and there was a problem that it could only be used for small ones.

Further, due to the difference in size between the anticorrosion layer protection device and the size of the insulating cylinder, there is a problem that workability of fixing the lead wire of the anticorrosion layer protection device is poor.

The present invention has been made in view of the above points, and provides an insulation connection part that supports and fixes an anticorrosion layer protection device without the need for a cradle near the insulation connection part, and that improves workability. The purpose is.

(Means for Solving the Problems) The insulating connection part of the present invention is an insulating connection part for connecting a shield case of a device and a metal sheath of a high-voltage cable through an insulating tube, wherein the shield case and the metal sheath. Between, and insert a corrosion protection layer protection device having a non-linear electrical characteristics, between the shielding case and one terminal of the protection device protection device is a flat overhanging to the side of the insulating connection. Connected by a conductor plate, between the metal sheath and the other terminal of the anticorrosion layer protection device is connected by a conductor plate bent in a key shape,
It is characterized in that the anticorrosion layer protection device is supported and fixed only by the flat conductor plate and the key-shaped conductor plate.

(Embodiment) Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

FIG. 1 is a front view showing an insulation connection portion of the present invention.

In the figure, for example, the shielding case 1 of a device such as GIS and C
As described above with reference to FIG. 2, the metal sheath 2 of the high voltage cable such as the V cable is connected via the insulating tube 4. The insulating cylinder 4 is sandwiched between flanges 3a and 3b, which are connected and fixed to each other by a bolt 5 and a nut 6.

On the other hand, near the right side of the insulating cylinder, the anticorrosion layer protection device 20 including a gapless arrester or the like is arranged. The anticorrosion layer protection device 20 has a bolt-like structure in which one terminal 23 and the other terminal 23 'are both threaded on the outer peripheral surface thereof. Then, between the bolt 5 located at the upper right portion of the insulating cylinder 4 and one terminal 23 of the anticorrosion layer protection device 20,
A flat conductor plate 21 that projects to the side of this insulating connection portion is fitted in, and is tightened and fixed by the nut 6 and the double nut 24, respectively.

The conductor plate 21 is, for example, a copper plate provided with holes through which bolts are inserted. The thickness of this copper plate is 20
Select a thickness that provides sufficient strength to support the. The shape may be a strip shape with bolt holes at both ends, but if it is desired to have more strength than that, it may have a configuration in which one side edge is bent to have an L-shaped cross section. .

On the other hand, a key 5 bent conductor plate 22 is fitted into the bolt 5 located at the lower right corner of the insulating cylinder 4 and the other terminal 23 'of the anticorrosion layer protection device 20, and the nut 6 or the double nut 24 respectively. It is fastened and fixed by. The conductor plate 22 bent into the key shape is composed of a steel plate or the like similar to the flat conductor plate 21. This bent shape is determined in advance in consideration of the sizes of the insulating cylinder 4 and the anticorrosion layer protection device 20. This may also have an L-shaped cross section in order to have strength.

The distance between the flat conductor plate 21 and the key-shaped bent conductor plate 22 is set slightly larger than the size of the anticorrosion layer protection device 20, and the double nuts 24 and 24 'allow fine adjustment of the connection position. Workability is good if done.

Further, the reason why the flat conductor plate 21 is provided on the side of the shielding case 1 of the device is that the distance between the shielding case 1 of the device and the flange 3a arranged on the upper surface of the insulating cylinder 4 is usually selected to be relatively short. Also, since the workability is poor because the gap is not sufficient, a flat conductor plate is used for this portion to facilitate the tightening work of the nut 6 and the table nut 24.

On the other hand, since the total length of the anticorrosion layer protection device 20 is usually larger than the length of the insulating cylinder 4, the key-shaped conductor plate 22 should be connected to the other terminal 23 ′ of the anticorrosion layer protection device 20. did.

In addition, when connecting a high-voltage cable to a device such as GIS, usually, the high-voltage cable is connected to the lower side of the metal case of the device 1 while standing up. It can be said that the configuration in which the protection device 20 is suspended via the flat conductor plate 21 is most suitable for handling.

Further, according to the embodiment shown in the figure, the lead wire of the anticorrosion layer protection device 20 is not an insulated wire as in the conventional case but a bolt shape, so that an unreasonable force is not applied to the inside at the time of installation work, and the corrosion prevention There is no need to worry about damage to the layer protection device.

The present invention is not limited to the above embodiments.

In the above embodiments, the connection between the device such as JIS and the metal sheath of the high-voltage cable has been described as an example, but the device is not limited to an electric device for starting and connecting the cable, for example, a high-voltage cable. The present invention can also be applied to an insulating connection between each other. In that case, the anticorrosion layer protection device may be installed horizontally. In the case of this horizontal arrangement, it is preferable that the anticorrosion layer protection device is arranged below the insulating cylinder in order to balance the force.

(Effects of the Invention) According to the above-described insulating connection portion of the present invention, it is not necessary to mount the anticorrosion layer protection device on a special frame or the like, and the device is directly supported and fixed in the vicinity of the insulating cylinder through the conductor plate. The anticorrosion layer protection device can be mounted firmly without impairing the characteristics and with good workability.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the insulated connection portion of the present invention, and FIG. 2 is a front view showing an example of a conventional insulated connection portion. 1 ... Equipment shielding case, 2 ... Cable metal sheath, 3a, 3b ... Flange, 4 ... Insulation cylinder, 5 ... Bolt, 6 ... Nut, 20 ... Corrosion protection layer protection device, 21 ... Flat conductor plate, 22 ... keyed conductor plate, 23 ... One terminal of anticorrosion layer protection device, 23 '... Other terminal of anticorrosion layer protection device, 24, 24' ... Double nut.

Claims (1)

[Scope of utility model registration request] 1. A non-linear electric characteristic is provided between the shielding case and the metal sheath in an insulating connection portion for connecting a shielding case of a device and a metal sheath of a high-voltage cable through an insulating tube. Insert the anticorrosion layer protection device, between the shielding case and one terminal of the anticorrosion device protection device,
Connected by a flat conductor plate protruding to the side of the insulating connection portion, and connecting the metal sheath and the other terminal of the anticorrosion layer protection device by a conductor plate bent in a key shape, An insulating connection part, wherein the anticorrosion layer protection device is supported and fixed only by a conductor plate and the conductor plate bent in the key shape.