JPS58112413A - OF cable terminal connection - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an OF cable terminal connection section (particularly an air terminal connection section for OF cables having a built-in oil stopper mechanism).

The air terminal connection portion for the OF cable constitutes an insulating oil container using an insulator tube and metal fittings combined with the insulator tube. Therefore, the pressure of the insulating oil acts directly on the insulator tube, so the maximum usable oil pressure depends on the internal pressure burst strength of the insulator tube. However, the wall thickness of the insulator tube has a manufacturing limit, and at present it is difficult to obtain an insulator tube that can be used at a high internal pressure of about 30υ. On the other hand, one way to solve this problem is to install a reinforcing pipe inside the insulator pipe, but if the insulator pipe is long, it has a long overall length, a thick wall, and an electric opening F. It is extremely difficult to manufacture pipes with excellent quality.

Therefore, this invention reduces the internal pressure that acts directly on the insulator pipe by providing a double oil stopper mechanism inside, thereby eliminating the need to make the wall thickness of the insulator pipe extra thick, and using a single reinforced pipe. The purpose is to provide a structure for a termination connection that does not Hereinafter, the configuration of the present invention will be explained based on the accompanying drawings.

The upper and lower ends of the insulator tube 1 are provided with rLOIJ rings 2.3 and 2.3, respectively.
The upper end metal fitting 4 and the lower end metal fitting 5 are connected with a cover plate through them, and a tightening metal fitting 6 & an oil stopper plate 7 are attached to the lower surface of the lower end metal fitting 5. The oil stopper plate 7 is made of epoxy resin, has an I-I-J cone-shaped funnel shape, and is attached to the lower end fitting 5 via an O-ring. A conductor pull-out rod 9 is inserted into the At metal fitting 4, and the lower end of the conductor pull-out rod 9 is located at the center of the oil stopper plate 7 described in MjJ. through the O-ring 10 and extending downward. Further, a capacitor cone 11 made of oil-impregnated paper is formed around the conductor pull-out rod 9 within the insulator tube. As a result of providing the oil stop plate 7 as described above at the lower end of the insulator tube 1, there is a hydraulic zone 1 inside the insulator tube 1 that is separate and independent from the hydraulic pressure on the cable 12 side.
3 is formed.

Note that the connector 1 for pressurizing the hydraulic zone 13 is
4 is provided with a lower metal fitting 5I.

The conductor 15 of the cable 12 is inserted into the lower end of the conductor pull-out rod 9, and the conductor 15 is connected by compressing the lower end. Around the connection part of the conductor 15 and the stripped part of the cable 12, a reinforcing insulating paper layer 16 is placed around the connection part of the conductor 15 and the stripped part of the cable 12 to maintain communication with the oil passage of the cable 12, as in a normal oil stop connection method.
The upper end surface thereof is formed with an inner taper along the oil stopper plate 7. In addition, cable sheath 17 and n1
A metal case 18 is fitted between the lower fitting 5 and the inside thereof forms a hydraulic zone 19 on the cable side.

Note that the metal case 18 is equipped with a connector 20 for refueling.
is provided.

As described above, this invention forms a hydraulic zone within the insulator tube that is separate and independent from the cable side by means of the oil stopper plate provided at the bottom of the insulator tube, so that the internal pressure acting on the insulator tube can be reduced. Therefore, there is an effect that the present invention can be applied to an OF cable for hydraulic pressure without making the wall thickness of the insulator pipe particularly thick or without using a reinforcing pipe.

It should be noted that manufacturing the oil stopper plate from epoxy resin is easy due to the current manufacturing equipment, and the method is shorter than the reinforced pipe mentioned above, so it is possible to make it with stable electrical performance. Obtainable.

[Brief explanation of drawings]

The drawings are cross-sectional views. 1...Insulator pipe, 2.3.8.10...0 ring, 4.
Upper end fitting, 5... Lower end fitting, 6... Tightening fitting, 7.
・Oil stop plate, 9... Conductor pull-out sweep, 13... Hydraulic zone patent applicant Sumitomo Electric Industries, Ltd.

Claims (1)

[Claims] An oil stopper plate is provided at the lower end of the insulator pipe, and the conductor pull-out rod inserted into the insulator pipe is passed through the upper end fitting of the insulator pipe and the above oil stopper plate, thereby forming an independent hydraulic zone that is separated from the two cable sides inside the insulator pipe. The terminal connection part of the OF cable is characterized by the following.