JPH0229780Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a capacitor-type power cable connection.

As this kind of thing, as shown in Figures 1 and 2,
A cable insulator in which a reinforcing insulator 20 is formed by dispersing conductive electrode balls 24 (iron, copper, aluminum, etc.) in a rubber or plastic insulator 22 (crosslinked polyethylene, EP rubber, etc.). 1
2 has been proposed.

Note that 10 indicates a cable conductor, and 14 indicates a cable shear layer.

The connection section configured as described above has the following features: 1. Electrostatic capacitance is distributed in the reinforcing insulator 20 in the radial direction and axial direction by the electrode balls 24, and the capacitance is distributed between the cable conductor 10 and the cable. The voltage between the thin layers 14 is shared. 2. Appropriate capacitance can be designed using the electrode bulbs 24, so the connecting part can be made smaller. 3. Since the electrode bulbs 24 are used, the angular shape can be reduced. However, it has excellent properties such as being unable to form electrically steep electric fields.

The purpose of this invention is to provide a power cable connection in which the voltage distribution by the electrode bulbs 24 is more uniform.

This invention is characterized in that the size of the electrode spheres 24 disposed in portions of the reinforcing insulator 20 with a high potential gradient is larger than the electrode spheres 24 disposed in portions with a low potential gradient.

When the size of the electrode sphere 24 is increased, the electrode sphere 24
If the size of the electrode sphere 24 is made small, the capacitance becomes small.

In a portion where the potential gradient is high and the potential sharing is large, the shared voltage can be reduced by increasing the capacitance per unit length (per space between the electrode balls 24). On the other hand, in a portion where the potential gradient is low and the shared voltage is small, the shared voltage can be increased by reducing the capacitance. Therefore, as described above, by changing the size of the electrode spheres 24 depending on the height of the potential gradient, the voltage shared between each electrode sphere 24 can be made uniform.

FIG. 3 schematically shows the terminal connection section.

In this case, the potential gradient is high on the low voltage side of the cable insulation layer 14 and the stress cone 16, and the potential gradient is low on the high voltage side of the cable conductor 10.

Therefore, the size of the electrode spheres 24 may be such that those disposed on the low voltage side are large and the electrode spheres 24 are made small toward the high voltage side.

The potential gradient changes not only in the cable length direction but also in the radial direction. Accordingly, an arrangement method may be considered in which the size of the electrode spheres 24 is changed both in the cable length direction and in the radial direction.

FIG. 4 is a diagram schematically showing the case of an intermediate connection part.

In this case, the potential gradient on the high voltage side of the cable conductor 10 is high, and the potential gradient on the low voltage side of the insulation layer 18 is low.

Therefore, the electrode bulb 24 is also made larger on the inside (the side closer to the cable conductor 10) and becomes smaller toward the outside.

In addition to the spherical shape, the shape of the electrode sphere 24 may be an ellipsoid.

Effect of the invention Voltage sharing by the electrode bulb 24 is achieved by the reinforcing insulator 20
The connections are more uniform throughout, allowing the connections to be made more compact.

[Brief explanation of drawings]

1 and 2 are explanatory views of the prior art, and FIGS. 3 and 4 are schematic explanatory views of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Cable conductor, 12... Cable insulator, 14... Cable insulation layer, 20... Reinforcement insulator, 22... Insulator, 24... Electrode ball.

Claims (1)

[Claims for Utility Model Registration] A large number of electrode balls 24 are placed on the protruding cable insulator 12 and in the rubber/plastic insulator 22.
In a power cable connection section provided with reinforcing insulators 20 arranged at intervals, the size of the electrode bulb 24 disposed in a part of the reinforcing insulator 20 with a high potential gradient is determined by the potential. A power cable connection part characterized in that it is larger than the electrode bulb 24 disposed in a part with a low slope.