JPS5825715Y2 - OF cable connection part - Google Patents

Description

[Detailed explanation of the invention] One of the forced cooling methods for single-core OF cables is to flow pressurized insulating oil in the radial direction of the cable insulator to eliminate temperature differences due to dielectric loss in the cable insulator. There is.

This invention relates to an OF cable connection in such a cooling method.

Explanation of the prior art (Fig. 1) Insulating oil is pressurized by the pump 10, and the cable conductor 12 is
into the internal oil passage 14 inside.

Insulating oil flows radially within cable conductor 12 and cable insulation 16.

During this time, the insulating oil removes the heat generated within the cable.

The insulating oil exits into an external oil passageway 20 between cable insulation 16 and cable sheath 18 and is conducted out of the cable.

Then, it passes through the cold rice cooker 22 and is fed into the internal oil passage 14 again.

However, at the connection part, the presence of the sleeve 24 prevents the insulating oil from flowing in the radial direction.

Generally, the thermal resistance of the connection part is higher than that of other parts, so the temperature is also higher.

As a result, the temperature increases during shredding, and there is a risk that so-called hot spots may occur.

Purpose and outline of the invention In order to solve the above problems, this invention uses a sleeve with holes for connecting conductors.

This allows the insulating oil to flow in the radial direction also at the connection part.

In addition, since only one hole 26 exists in any cross section perpendicular to the length direction of the sleeve 24, there is no part where the cross section area perpendicular to the length direction of the sleeve becomes small. , so the electrical resistance suddenly becomes a dog.

Example "Figure 2" shows its cross section.

A sleeve 24 with a large number of holes 26 penetrating from the inner surface 241 to the outer surface 242 as shown in FIG. 3 is used.

The holes 26 are distributed evenly along the length of the sleeve 24.

Also, the direction in which the holes 26 are made should be such that they face in all directions without being biased to one side.

Also, as shown in Figure 4, only one hole should be made in one cross section.

If a large number of holes are drilled in one cross section, the cross-sectional area will suddenly become smaller, and the electrical resistance will suddenly become steeper.

Note that the steel sleeve 28 is similarly made with holes 30 for passing insulating oil.

In this way, a radial flow of insulating oil is created within the cable insulation 16 at the connection section as well as at other cable sections.

Effects of the invention As mentioned above, the insulating oil can flow in the radial direction on average throughout the length of the cable, including the connection parts.
Helps eliminate hot spots.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the prior art, Fig. 2 and the following are related to embodiments of the invention, Fig. 2 is a longitudinal sectional side view, Fig. 3 is a partial longitudinal sectional side view of the sleeve 24 used, and Fig. 4 IV- in Figure 3
IV(7)I is a folded view. 12... Cable conductor, 14... Internal oil passage, 16... Cable insulator, 20...
...External oil passage, 24...Sleeve.

Claims (1)

[Claim for Utility Model Registration] Insulating oil is fed under pressure into the internal oil passage 14 in the cable conductor 12, flows radially through the cable conductor 12 and the cable insulator 16, and exits into the external oil passage 20. At the connection part of the forced cooling type OF cable, which takes the cable out of the cable, cools it, and feeds it into the internal oil passage 14 again, a large number of holes 26 are provided as sleeves 24 for connecting conductors, penetrating from the inner surface 241 to the outer surface 2421. These holes 26 are distributed evenly in the length direction of the sleeve 24, and are oriented in all directions, and also in a cross section perpendicular to the length direction of the sleeve 24. An OF cable connection part characterized by the fact that only one exists.