Electrical connectors – Having retainer or passageway for fluent material – Vent
Patent
1991-11-22
1994-05-31
Abrams, Neil
Electrical connectors
Having retainer or passageway for fluent material
Vent
174 731, 439796, 439818, H01R 1352
Patent
active
053164920
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a joint for high-voltage and very high-voltage plastic cable having a conductor and at least one surrounding insulating sheath, this joint comprising an elastic stretchable electrical sleeve insulator having an electrically conducting stress-controlling body, for screening cable conductor connecting elements received in an inner space defined by the stress-controlling body, an insulating body surrounding the stress-controlling body, and an electrically conducting sheath surrounding completely or partially the insulating body, the sleeve insulator having at least one axial close-fitting passage merging into the space in the stress-controlling body for receiving a cable end.
A joint of this type is used for connecting a high-voltage and a very high-voltage plastic cable to at least one other cable, a high-voltage switch or a high-voltage transformer, and is known from DE-B-1,665,222.
In connections of high-voltage plastic cables, in particular in high-voltage sleeves, it is important that they can be assembled in the field rapidly and, if possible, by untrained personnel. A sleeve connection having preferably a minimum number of components, which have all been completely inspected electrically beforehand and which can be placed rapidly in each other with a limited number of man-independent operations, offers the maximum operating reliability and safety. In connections of plastic cables for very high voltages it is very important that, after assembly of the connection, the mutual positions of the components are precise so that the necessary electrical insulation values are complied with. Furthermore, the cost price must be kept low.
In the case of joints for high-voltage and very high-voltage plastic cable according to the state of the art, i.e. DE-B-1,665,222 mentioned above, the cable conductor connecting elements are made up as a connecting clamp for fixedly connecting the cable conductors. Assembly in the field is time-consuming and man-dependent and a good inspection of the electrical characteristics of the connection is not readily possible and only to a limited extent, and the operating reliability of these connections is less well guaranteed.
SUMMARY OF THE INVENTION
The invention now has for its object to provide a joint for a high-voltage and very high-voltage cable insulated with PE, XLPE or EPR for mains voltages of 50,000 volts up to and including 400,000 volts and possibly higher, which joint complies with the requirements described above.
According to the invention this is achieved in that electrical conductor connecting elements designed as a plug-in connector are used, comprising at least one mating plug part and counter-plug part of electrical conducting material, and in that means are provided for mechanically locking the connector parts with respect to each other.
Use is made, according to the invention, of a prefabricated and electrically inspected sleeve insulator which is known, inter alia, from DE-B-1,665,222 and preprocessed cable ends, which have also been electrically inspected.
By fitting a connector part to the cable end under optimum working conditions in the factory and checking them beforehand in combination with the prefabricated sleeve insulator at a voltage level of two to three times the operating voltage, the quality of pre-processed cable ends and the sleeve insulator is maximized before assembly in the field. An electrically well conducting and mechanically strong connection is brought about for the high-voltage plastic cable to be connected, the cable end being precisely positioned with respect to the sleeve insulator, as a result of which the required insulation value is insured.
Since any contaminants on the cable ends are pushed off by the edge of the sleeve insulators during the plugging-in procedure, no specific requirements have to be imposed on the circumstances during the assembly of the connection in order to achieve a good result, with regard to insulation value.
It should be noticed that connector joint
REFERENCES:
patent: 2077737 (1937-04-01), Brandt
patent: 2967901 (1961-01-01), Priaroggia
patent: 3612746 (1971-10-01), Sankey
patent: 3622688 (1971-11-01), Link
patent: 3678432 (1972-07-01), Bolivar
patent: 3784729 (1974-01-01), Davis et al.
patent: 4074926 (1978-02-01), Broad
Abrams Neil
NKF Kabel B.V.
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