JP2917630B2 - Ground terminal structure for submarine cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground terminal structure for a submarine cable, and more particularly to a ground terminal structure for a submarine cable that seals a cable terminal from seawater and provides a sea earth for supplying power when laying the submarine cable.

[0002]

2. Description of the Related Art Conventionally, there are roughly two types of this type of submarine cable terminal grounding structure. The first structure example is a structure shown in FIG. 3 in which a metal seal cap is placed over a submarine cable terminal and sealed with a self-sealing tape or the like. FIG. 3 is a side view of a conventional example using a seal cap. The seal cap 41 is fitted into the end of the submarine cable 45 and is sealed by a seal material 47 such as a self-sealing tape. The power supply center conductor 46 of the terminal portion is in contact with the bottom of the seal cap 41. When putting it into the sea, wind a cable stopper called a preformed stopper around the submarine cable, attach the rope, and put it into the sea.

[0003] A second structural example is a structure in which a device serving as a sacrificial electrode called an end box having a tensile strength cable 31 anchoring structure in a submarine cable is attached to the tip of a submarine cable. After stopping, attach the rope to the end box and throw it into the sea.

In the first example, the time from the seal to the introduction into the sea is very short (several tens of minutes), but the water pressure resistance is lower than that of the end box. In addition, the seal cap can be easily connected to the central conductor for power supply of the submarine cable. However, since the seal cap is not designed as a sacrificial electrode, if power is supplied for a long time, the seal cap body may melt and may not serve as a seal. In the second example, although it takes time (about 10 hours) to attach the end box to the submarine cable, the end box can sufficiently function as a seal even when laid in the deep sea. However, since this end box is not originally designed as a sacrificial electrode, it has a longer time than that of the first example, but may be melted, and may not be able to serve the function of retaining the tensile strength wire and the like.

[0005]

However, these conventional structures using a seal cap or an end box are not originally designed as sacrificial electrodes, and thus melt when a long-time power is supplied, which adversely affects the sealing performance and the cable pulling performance. There is a problem to give. The present invention aims at improving the melting resistance of the structure by the seal cap which can be sealed in a short time among these two examples.

[0006]

According to the present invention, there is provided a ground terminal structure for a submarine cable, wherein the terminal is fitted into a terminal portion of the submarine cable.
Insulate the end from seawater and at the same time make electrical contact with seawater
Metal seal cap with bottomed cylinder for holding
And a joint between the seal cap and the submarine cable
Cable for submarine cable consisting of a sealing material
In the terminal structure, in the position in series with the seal cap
The seal is fixed so as to sandwich the submarine cable.
Metal sacrifices to reinforce cap contact with seawater
A projection is provided on the electrode and the bottom surface of the seal cap.
Connection between the projection and the sacrificial electrode.
It has a connection line.

[0007] Alternatively, it is fitted into the terminal of a submarine cable.
Rarely insulates the terminal from seawater and simultaneously
Metallic seal cap with bottomed cylinder to maintain contact
And a connection between the seal cap and the submarine cable.
For submarine cables consisting of a sealing material that seals the joint
In a ground terminal structure, a bottom surface of the seal cap
Is secured so as to maintain electrical contact with the seal cap.
A sacrificial electrode to reinforce the electrical contact of the
Have.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.
I do.

FIG. 1 is a side view of the first embodiment. The seal cap 21 has a projection 28 at the bottom, and the sacrificial electrode 22 is made of metal having a half-split structure and is fixed to the submarine cable 25. Inside the seal cap 21, the center conductor 26 of the terminal and the projection 28 of the seal cap 21 are configured to be in electrical contact with each other. The projection 28 outside the seal cap 21 and the sacrificial electrode are Connected by The second embodiment is superior to the first embodiment in seawater sealing performance, but the shape of the seal cap 21 is complicated. FIG. 2 is a side view of the second embodiment. The center conductor 36 is in contact with the seal cap 31 inside similarly to the first embodiment. The seal cap electrode 32 is directly fixed.

[0010]

As described above, according to the present invention, since the power supply sacrificial electrode is provided separately from the seal cap as a submarine cable grounding terminal using the seal cap, the seal cap does not melt even when power is supplied for a long time. This sealing property does not deteriorate. This has the effect of increasing the durability of the entire ground terminal.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of the present invention.

FIG. 2 is a side view of a second embodiment of the present invention.

FIG. 3 is a side view of a conventional example.

DESCRIPTION OF SYMBOLS 21, 31 seal cap 22, 32 sacrificial electrode 23 connection wire 24 fixing portion 25, 35 submarine cable 26, 36 central conductor 27, 37 sealing material 28 seal cap projection

Claims (2)

(57) [Claims] 1. A terminal part which is fitted into a terminal of a submarine cable.
Insulation from seawater while maintaining electrical contact with seawater
And a metal seal cap with a bottomed cylinder
Seal the joint between the seal cap and the submarine cable.
Submarine cable grounding terminal structure
The sea cap at a position in series with the seal cap.
The seal cable is secured so as to sandwich the bottom cable.
Metal sacrificial electrode to reinforce the contact of the pump with seawater
And providing a projection on the bottom surface of the seal cap.
A connection line for electrically connecting the protrusion and the sacrificial electrode is formed.
A ground terminal structure for a submarine cable, comprising: 2. A terminal fitted into a terminal portion of a submarine cable.
Section is insulated from seawater while maintaining electrical contact with seawater.
A cylindrical seal metal cap with a bottom for holding
Seal the joint between the seal cap and the submarine cable.
Terminal for submarine cable composed of sealing material
In the structure, the bottom surface of the seal cap is electrically
The seal cap is secured to maintain contact
Provide a sacrificial electrode to reinforce the electrical connection with water.
And a ground terminal structure for a submarine cable.