JPH0353565Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a termination section for cable testing.

[Prior art and problems] At the end of the cable test, a rubber capacitor cone is inserted into the end of the cable core in order to alleviate the electrical stress at the end of the cable's external shielding layer and provide a prescribed creeping discharge strength. This cable core end portion is surrounded by a cable termination sleeve, and the inside of the sleeve is filled with insulating oil or insulating gas. In this case, if the cable is a rubber or plastic insulated cable, apply a seal from the end of the cable sheath (present inside the jacket) to prevent insulating oil, etc. inside the jacket from entering between the cable sheath and the cable core. There is a need.

However, when testing rubber or plastic insulated cables, if insulating oil enters between the cable sheath and cable core, the electrical characteristics of the cable (especially void discharge characteristics) may change. , it is difficult to accurately test the cable characteristics, so the above seal needs to be strict. Therefore, the sealing work requires a considerable amount of time.

In addition, when testing such cables, it is necessary to provide a guard electrode at the end of the cable so that the characteristics of the cable itself and the end of the cable can be measured separately. Attaching the guard electrode is also difficult.

[Purpose of the invention] An object of the invention is to provide a cable test termination part that can easily seal the end of a cable sheath and attach a guard electrode.

[Structure of the invention] The cable testing termination part according to the invention has a metal tube body watertightly attached to the lower end of a rubber condenser cone, and the lower end of the metal tube of the capacitor cone is attached to the lower end of the lower metal fitting of the cable termination tube. The lower end of the lower metal fitting is connected in a watertight manner and electrically conductive, and the lower end of the lower metal fitting and the cable sheath are watertightly connected;
This configuration is characterized in that the lower metal fitting is provided with a measurement terminal for measuring the electrical characteristics at the end of the cable separately from the electrical characteristics of the cable main body.

[Explanation of Examples] The present invention will be explained below with reference to the drawings.

In the figure, reference numeral 1 denotes a rubber or plastic insulated cable, such as a cross-linked polyethylene insulated power cable, and a cable insulating layer 11 is integrally extruded with an external semiconductive layer 12, and an external metal shielding layer 13 and a cable sheath are applied thereon. (Polyvinyl chloride sheath) 14 is coated. 120 is the edge of the outer semiconducting layer, 130 is the edge of the outer metal shielding layer, and 140 is the edge of the outer semiconducting layer.
indicate the cable sheath ends.

2 is a rubber capacitor cone made of ethylene propylene rubber or the like by molding, casting, molding, etc., and the cable core terminal insertion hole 2
1, and a metal tube body 3 (made of copper or aluminum, for example) is attached to the lower end by embedding. The rubber capacitor cone 2 is inserted through the cable core terminal 10, with the base electrode 22 of the capacitor being brought into close contact with the outer semiconducting end 120 of the cable core.

4 is a cable termination tube, 5 is a lower metal fitting,
The lower end of this lower metal fitting 5 and the lower end of the metal pipe body 3 are connected using lead work or the like (an O-ring may be interposed at the bonding interface if necessary) to electrically conduct the two. be.

Reference numeral 61 denotes a measurement terminal provided on the lower metal fitting 5, and this measurement terminal 61 is connected to the cable terminal (i.e., The electrical characteristics of the rubber capacitor cone 2 and the cable core end portion 10) can be measured separately from the electrical characteristics of the cable body.

Reference numeral 62 denotes a measurement terminal for measuring the electrical characteristics of the cable body, and is connected to the external metal shielding layer 13 of the cable 1 by a bond wire 9.

71 is an insulating support insulator, and 72 is a frame. Reference numeral 8 denotes a sealing portion that connects the lower metal fitting 5 and the cable sheath 14 in a watertight manner, and is formed by winding seal tape, resin molding, or the like. A is insulating oil or insulating gas (SF ₆ ) filled in the mantle 4.

[Effects of the invention] The cable testing termination section according to the invention has the configuration as described above, and the metal tube 3 is watertightly attached to the lower end of the rubber condenser cone 2.
Since its lower end is watertightly connected to the lower end of the lower metal fitting 5 of the cable termination sleeve 4, the metal pipe body 3
Accordingly, the insulating oil A and the like in the sleeve 4 can be cut off from the cable sheath end 140, and intrusion of the insulating oil between the cable sheath 14 and the cable core 11 can be prevented.

Further, since the lower end of the metal tube 3 and the lower end of the lower metal fitting 5 are connected in an electrically conductive state, the measurement terminal 61 provided on the lower metal fitting 5 due to the presence of the metal tube 3 Using this method, the electrical characteristics at the end of the cable (ie, the rubber capacitor cone 2 and the cable core end 10) can be measured separately from the electrical characteristics of the cable body.
Of course, by using another measurement terminal 62, the electrical characteristics of the cable body can also be changed to the rubber capacitor cone 2.
In addition, it can be measured separately from the electrical characteristics of the cable core terminal section 10.

As described above, according to the cable testing termination section of the present invention, even with a simple structure in which the metal tube provided watertightly at the lower end of the rubber condenser cone is tied to the lower metal fitting of the sleeve, it is effective against the insulating oil inside the sleeve. In addition to the sealing function at the end of the cable sheath, it has the synergistic effect of allowing the measurement guard electrode to be attached compactly.

[Brief explanation of the drawing]

The drawing is a partially cutaway side view showing a cable testing termination section according to the present invention. 2...Rubber condenser cone, 3...Metal tube body, 4...Cable termination tube, 5...Lower metal fitting,
61, 62...Measurement terminal, 14...Cable sheath.

Claims (1)

[Scope of utility model registration request] A metal tube is watertightly attached to the lower end of the rubber capacitor cone, and the lower end of the metal tube of the capacitor cone is connected to the lower end of the lower metal fitting of the cable termination sleeve in a watertight manner and electrically conductive. The lower end of the lower metal fitting and the cable sheath are connected in a watertight manner, and the lower metal fitting is provided with a measurement terminal for measuring the electrical characteristics at the end of the cable separately from the electrical characteristics of the cable main body. A cable test termination section characterized by: