MXPA96001998A - Head or termination of ca - Google Patents

Abstract

The present invention is directed to obtain a simplified connection system for high voltage power cables having nominal currents up to 400 KV and above. A connection system for common cable is obtained, for all accessories and for interconnection. The connection system uses an interconnection in general applicable (4, 5, 6, 13, 14, 15, 30, 40) for the interconnection with a number of different apparatuses, including a cable head or termination (30) consisting of of an elastomeric body (36), integrated in this case is a stress relief device (34), a connector shield (35), an insulation having a conical interconnection surface (37) and an outer conductive shield (39), and an rigid insulator (41) having a conical interconnection surface (42) corresponding to the interconnection surface (37) of the head (30) of the

Description

REF: 22545 HEAD OR CABLE TERMINATION Description The present invention relates to a device for the interconnection of a high voltage cable with an apparatus and / or with a second high voltage cable, consisting of a cable head and a rigid insulator. 0 When such high voltage power cables are connected in normal jacks, in transition joints, to transformers and other SF6 and oil filled devices, and to external fittings and terminals, the interconnections are usually different for S each application. Therefore, the aim of the present invention is to provide a simplified connection system for the above cables, which have nominal currents of up to 400 KV and above. Q The characteristics of the invention are defined in the appended claims to the patent. With the present invention, a common cable connection system is obtained for all accessories and interconnections. The interconnection or interface between the end of the cable and any accessory, between two ends of cable or between two devices, is generally applicable, resulting in a number of advantages, such as factory pre-tests, time and cost reduction. of installation, reduction of tools and simplified tests in the field. The design and dimensions of the stress cone could also be the same for all applications, the only variation being the cable diameter 0 or the input of the device. An additional advantage is that the components of the interconnection do not include any gas or oil and, for example, they can not leak or explode. The characteristics and objectives previously [*] and others of the present invention, will appear clearly from the following detailed description of the embodiments of the invention, taken in conjunction with the drawings, where Figures 1 to 3 illustrate three different principles of interconnection between one end of cable and accessories, and Figures 4 to 12 illustrate various applications of the invention. 25 Figures 1, 2 and 3 illustrate three methods of interconnection, - respectively referred to as an internal cone concept, an external cone concept and a non-cone or slightly internal cone concept. The cone concept type refers to the shape of the connector on the side of the apparatus. In the three figures an apparatus or accessory 1, 2 and 3 respectively, are indicated on the left. The connectors 4, 5 and 6 are respectively provided with an internal cone 7, an external cone 8 and a slight internal cone 9. The interconnection could also be obtained by the use of flat contact surfaces. To the right in Figures 1 to 3 are illustrated three cables 10, 11 and 12, respectively provided with terminations or pairs 13, 14 and 15 having end surfaces 16, 17 and 18, which conform to the corresponding conical surfaces 7 , 8 and 9. Conductive joints (plug-in unit, welding, fixing, etc.) are not part of the present invention and will not be described herein. Only the cable connectors 19, 20 and 21 have been indicated on the cable heads 13, 14 and 15, respectively. In the following detailed description of the examples of the cable connections, it has been chosen to show the concept of external cone, being understood however, that the same series of interconnections can * be obtained with the concept of internal cone and with the cone concept slightly internal (or flat). A general advantage of the external cone concept over the inner cone is that the outer cone 5 separates the cable connection additionally from the apparatus to which it is connected, which does not make the inner cone. Hence, it is less likely that a fault on one side affects the other side. The concept of internal cone could have 10 the advantage that a shorter solution could be used outside an SF6 cubicle. Problems with conical surfaces can arise when components are made by different suppliers. The connectors of the devices are usually ] made of rigid material, non-compressible, epoxy or similar, while the cable heads are usually made of rubber and similar compressible or elastomeric materials. The concept of external cone could have the advantage over the concept of internal cone 2Q that is easier to expand the rubber material than compress it. One advantage of the substantially flat surface interconnection is that it simplifies the complete alignment of the surfaces encountered, without the risk of luminescent discharges.

Figures 4 and 5 illustrate the components of an SF6 terminal using the external cone concept and the present invention. As will be seen from the subsequent drawings, the concept of the cable head illustrated in Figure 4 is the generally applicable building block of all applications. The cable head 30 shown in the lower part of Figure 4 is accommodated on a cable end 31, provided with a cable connector 32 and a strain relief cone 33 comprising a voltage or voltage diverter 34, as a strain relief device and a connector shield 35 embedded within a body 36 of elastomeric insulation. The elastomeric insulation body 36 is covered by a conductive screen 39, and is enclosed within an outer rigid case 38. The termination or head 30 is fitted to an interconnection device 40 which includes a rigid isolation body 41, for example, made of an epoxy resin, having a conical interconnection surface 42 which conforms to the interconnection surface 37 of the elastomeric body 36 of the head 30.

When the interconnection device 40 is used in connection with an SF6 terminal, the rigid isolator 41 is provided with a connector 43 which may have a compact version 44 or a standard IEC 859 version (longer). An SF6 termination of the present invention is illustrated in Figure 5. In addition to the components 30, 40 and 43, the drawing indicates a SF6 46 case and a connector 47. The usual hollow insulator, used in conventional heads or heads, is replaced by the compact or rigid epoxy body 41, around the conductor . The advantages over conventional terminals are: Compact design, lower material and installation costs, complete independence between the gas-insulated switchgear and cable installations, and standardization. In Figures 6 and 7 two versions of the transformer terminals are illustrated. Figure 6 shows an application of the invention with a transformer 50 having a box 51 filled with oil, with an insulating sleeve 52 to which a cable end or head 30 and the connector 53 are connected. The connector 53 corresponds to the parts 40 and 43 in Figure 4. In Figure 7 a transformer * 55 is provided with the insulating sleeve 56 comprising the rigid insulation body 41, with the interconnection surface 42 which is directly connected to a cable head 30, which it has the corresponding interconnection surface 37, as indicated in Figure 4. This version of transformer terminal is useful only with the concept of external cone. This version implies improved safety due to the omission of the box filled with oil with its highly combustible oil. Figures 8 and 9 show two versions of outdoor terminals. In Figure 8 terminal 60 consists of components 30 and 40 combined with a conductor 61 which together with the epoxy insulator ] 5 40 is covered by drag resistant EPDM rubber or silicone rubber sheath 62. This design eliminates the need for an insulator filled with oil or SF6, while maintaining the mechanical stiffness of the omitted insulator. In Figure 9 an outdoor terminal 65 is illustrated, which includes an overvoltage suppressor device 66. This terminal is in principle similar to that described in US Pat. No. 5,206,780 (J Varreng 6). The device 66 that consists 25 nonlinearly as ZnO or SiC material is separated from the driver 67 by a layer of insulation material 68. The interconnections from the layer of nonlinear material, at the bottom to ground and at the top to the conductor 67 , they are not shown. The device 66 can be a continuous tube or this can consist of a number of series of connected annular elements. The device 66 and insulator 40 are covered with rubber resistant to creep or rubber-silicone sheath 69, as in Figure 8. Figure 10 illustrates a splicing EPDM straight line 70. The epoxy component 40 is shaped as a symmetrical double cone, which forms a central piece of a plug joint that joins two cable heads 30. This design may be more expensive than a pure elastomeric joint, but this has the advantage of being able to be tested in the factory and is of installation fast Figure 11 illustrates a transition joint 75 between a dry cable and a cable filled with oil. The epoxy component can be extended to form an insulator housing 76 on the side 77 filled with oil. The advantages are like the previous ones, - lower cost of material and installation, as well as a compact design. In Figure 12 a gasket 78 is illustrated between two apparatuses 79 and 80, for example, between a transformer and a switching station. Rigid insulators 81 and 82 secured to the apparatus for example as devices insulator sleeve have conical surfaces interconnection 83 and 84 corresponding to the connection surfaces 85 and 86 of the connection device 87. This device consists of a connector 88 for electrical conductors, not shown in this Figure, a connector shield 89, a body 90 made of insulating elastomeric material and covered by a conductive screen 91. this complete device enclosed within an outer rigid casing 92. for optimizing of the products described in the above detailed description, and for the safe performance of their high reliability of operation in high or extra-high voltage installations, an essential feature is the configuration of the outer surface of the rigid insulator, which has the interconnection surface conical Therefore, Figure 13 illustrates a rigid insulator 93, which corresponds to the insulator 41 in Figure 4, to be used in the above embodiments of this invention. The angle claimed is the angle between the longitudinal axis 94 and the boundary surface 95 of the insulator 93. This angle defining the cone of the insulation body must be between 15 ° and 45 °. The above detailed description of the modalities of this invention, should be taken as examples only, and should not be considered as limitations on the scope of protection.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, property is claimed as contained in the following:

Claims (15)

1. A device for interconnecting a high voltage cable with an apparatus and / or with a second high voltage cable, consisting of a cable head or termination and a rigid insulator, characterized in that the cable head consists of an elastomeric body embedded therein is a stress relief device, a connector shield, an insulation having a conical interconnection surface and an outer conductive shield, and a rigid insulator having a conical interconnection surface corresponding to the interconnection surface of the cable head.

2. The device for the interconnection of high voltage apparatus, characterized in that the rigid insulators have conical interconnection surfaces and are secured to each apparatus that is interconnected, and an elastomeric body integrated therein a shielding connector an insulation with conical interconnection surfaces and an external conductive screen corresponding to the conical interconnection surfaces of the rigid insulators

3. The device for interconnection purposes according to claim 1 6 2, characterized in that the material of each rigid insulator is an epoxy resin.

4. The device for interconnection purposes according to claim 1 or 2, characterized in that the material of each rigid insulator is a polyurethane.

5. The device according to claim 1 or any of the following, characterized in that the elastomeric body is enclosed within an external rigid case.

6. The device according to claim 1 or any of the following, characterized in that the interconnection surface of the elastomeric body is formed to fit an external conical head or an apparatus and / or a cable.

7. The device according to claim 1 or any of the following, characterized in that the interconnection surface of the elastomeric body is formed to conform to an outer conical terminal (8) of an apparatus and / or a cable.

8. The device according to claim 1 or any of the following, characterized in that the interconnection surface of the elastomeric body is shaped to fit a flat or conical terminal slightly internal / external of an apparatus and / or a cable.

9. The device according to claim 1 or any of the following, characterized in that the angle alpha defining the cone of the interconnection surface of the rigid insulator is between 15 ° and 453.

10. The device according to claim 1 or any of the following, characterized in that the rigid insulator is fitted to a terminal üt'ó.

11. The device according to claim 1 or any of the following, characterized in that the rigid insulator is fitted to a transformer terminal.

12. The device according to claim 1 or any of the following, characterized in that the rigid insulator is part of a weathering terminal.

13. The device according to claim 1 or any of the following, characterized in that the rigid insulator is part of an outdoor terminal that includes a sudden overload suppressor.

14. The device according to claim 1 or any of the following, characterized in that the rigid insulator is part of a splice.

15. The device according to claim 1 or any of the following, characterized in that the rigid insulator is part of an oil-filled transition joint.