CONTAMINATION PROTECTION FOR HIGH-VOLTAGE INSULATORS

Abstract

The invention relates to a contamination protection device (10) for high-voltage insulators (3), and to an assembly of a contamination protection device (10) and a high-voltage insulator (10). The contamination protection device (10) is designed for fastening to the insulator cap (5) of the high-voltage insulator (3) and has a protective shield (11), which extends radially around a feed-through opening (12) for the connection element (7) of the insulator cap (5), the feed-through opening (12) being surrounded, on the one side of the protective shield (11), by a fastening region (23) for interlocking connection to the insulator cap (5). On the other side of the protective shield (11), two eyes (14) for the insertion of a tab element (30) are provided and a tab element (30) is provided. The eyes (14) are arranged in such a way that the tab element (30) extends over the feed-through opening (12) after having been inserted

Claims

1. (canceled)

2. (canceled)

3. A contamination protection device (10) for high-voltage insulators (3) for fastening to the insulator cap (5) of a high-voltage insulator (3) comprising a protective shield (11), which extends radially around a leadthrough opening (12) for the terminal element (7) of the insulator cap (5), wherein the leadthrough opening (12) is surrounded on one side of the protective shield (11) by a fastening region (23) for the form-fitting connection to the insulator cap (5), characterized in that two eyes (14) for pushing through a lug element (30) and a lug element (30) are provided on the other side of the protective shield (11), wherein the eyes (14) are arranged in such a way that the lug element (30), once it has been pushed through the two eyes (14), extends beyond the leadthrough opening (12), characterized in that a radial installation opening (17), which runs from the leadthrough opening (12) up to outer edge (16) of the protective shield (11), is provided for laterally leading through the terminal element (7) of the insulator cap (5), and further characterized in that pins (18) of a dovetail joint (19) are provided on both sides of the installation opening (17) for optionally closing the installation opening (17), wherein preferably at least some of the pins (18) have locking tabs (18′) for securing the dovetail joint (19) in the closed position.

4-16. (canceled)

17. The contamination protection device of claim 3, characterized in that the contamination protection device (10) is produced from plastic, wherein the plastic is in this case selected such that the contamination protection device (10) is in principle sufficiently flexible to widen the installation opening (17) in such a way that the contamination protection device (10) can be pushed laterally onto the high-voltage insulator (3) or to be able to close or open the dovetail joint (19).

18. The contamination protection device as claimed in claim 3, characterized in that a latching closure (20) is provided at the outer rim (16) of the protective shield (12) for securing the dovetail joint (19) to prevent unintentional opening.

19. The contamination protection device as claimed in claim 3, characterized in that the lug element (30) has a head (32) for bearing against one eye (14) in the pushed-through state and a barb (33), remote therefrom, for engaging behind the other eye (14) in the pushed-through state.

20. The contamination protection device as claimed in claim 19, characterized in that the lug element (30) extends beyond the barb (33) by at least 25% of the spacing between the head (32) and the barb (33).

21. The contamination protection device as claimed in claim 19, characterized in that the lug element (30) extends beyond the barb (33) by at least 33% of the spacing between the head (32) and the barb (33).

22. The contamination protection device as claimed in claim 3, characterized in that the leadthrough opening (12) is surrounded on the other side of the protective shield (11) by a circumferential rim (13) protruding out from the protective shield (11).

23. The contamination protection device as claimed in claim 22, characterized in that the two eyes (14) are integrated in said rim.

24. The contamination protection device as claimed in claim 22, characterized in that the circumferential rim (13) has a guide (15) for a cable tie (40) on its outer side.

25. The contamination protection device as claimed in claim 24, wherein the guide (15) is configured in such a way that a cable tie (40) led through there also extends beyond the head (32) of the pushed-through lug element (30).

26. The contamination protection device as claimed in claim 3, characterized in that the protective shield (11) has at least one optionally openable aperture (21) emerging from the rim (16) of the protective shield (11) for leading through the fastening arm (6′) of an arc protection ring (6).

27. The contamination protection device as claimed in claim 26, characterized in that the protective shield (11) has at least at least two optionally openable apertures (21) emerging from the rim (16) of the protective shield (11).

28. The contamination protection device as claimed in claim 26, characterized in that the protective shield (11) has at least at least four optionally openable apertures (21) emerging from the rim (16) of the protective shield (11).

29. The contamination protection device as claimed in claim 26, characterized in that the at least one aperture (21) is surrounded on the other side of the protective shield (11) in each case by a rim (22) protruding out from the protective shield (11).

30. The contamination protection device as claimed in claim 3, characterized in that the fastening region (23) is configured in the form of a hat.

31. The contamination protection device as claimed in claim 3, characterized in that the protective shield (11) is inclined towards the side of the fastening region (23).

32. The device as claimed in claim 3, characterized in that a drop edge is provided on the outer edge (16) of the protective shield (11).

33. The contamination protection device as claimed in claim 3, characterized in that the protective shield (11) has radial reinforcing struts (24) on the side of the fastening region (23).

34. An arrangement comprising a high-voltage insulator (3) comprising an insulator cap (5) and a contamination protection device (10) arranged on the insulator cap (5), wherein the contamination protection device (10) is designed as claimed in claim 3 and is connected to the insulator cap (5) by means of a form-fitting connection.

35. The arrangement as claimed in claim 34, characterized in that the insulator cap (5) is a fork-shaped cap and/or the high-voltage insulator (3) has an arc protection ring (6) in the region of the insulator cap (5).

Description

[0029] The invention will now be described by way of example using an advantageous embodiment with reference to the attached drawings, in which:

[0030] FIG. 1 shows a schematic illustration of a high-voltage invention comprising high-voltage insulators with contamination protection devices according to the invention;

[0031] FIGS. 2a, b show schematic detail illustrations of a contamination protection device according to the invention shown in FIG. 1; and

[0032] FIGS. 3a, b show schematic detail illustrations of an arrangement comprising the contamination protection device shown in FIGS. 2a, b and a high-voltage insulator shown in FIG. 1.

[0033] FIG. 1 shows a high-voltage mast 1 with high-voltage lines 2 suspended thereon. The high-voltage lines 2 are fastened to the cross arms 4 via high-voltage insulators 3, which electrically isolate the high-voltage lines 2 from the high-voltage mast 1 and therefore from ground potential. In order to fasten the high-voltage insulators 3 to the cross arms 4, said insulators have insulator caps 5.

[0034] In each case one arc protection ring 6 is provided at the upper and lower ends on the high-voltage insulators 3, with any arc which may arise being guided away beyond the high-voltage insulator 3 between said arc protection rings in order not to damage the high-voltage insulator 3 itself.

[0035] Furthermore, a contamination protection device 10 according to the invention is provided at the upper end of each high-voltage insulator 3.

[0036] FIGS. 2a, b show the contamination protection device 10 used in FIG. 1 in the uninstalled state, whereas FIGS. 3a, b show the contamination protection device 10 in the state in which it is installed on a high-voltage insulator 3, wherein the high-voltage insulator 3 has an arc protection ring. The contamination protection device 10 is produced integrally from plastic.

[0037] The contamination protection device 10 has a circular protective shield 11, with a leadthrough opening 12 being provided in the center thereof for the terminal element 7 of the insulator cap 5. The leadthrough opening 12 is surrounded on the upper side of the protective shield 11 by a circumferential rim 13, wherein the leadthrough opening 12 and the circumferential rim 13 are designed in such a way that, in the installed state of the contamination protection device 10, they bear against the terminal element 7 of the insulator cap 5 (cf. FIGS. 3a, b).

[0038] On two opposite sides of the leadthrough opening 12, in each case one eye 14 is provided in the rim 13 for pushing through a lug element 30.

[0039] The lug element 30, in the production state, is joined to the rest of the contamination protection device 10 via a material bridge 31, wherein the material bridge 31 can be detached without the use of a tool for installing the contamination protection device 10. The lug element 30 is elongate and has a head 32 and a barb 33 arranged remote therefrom. The spacing between the head 32 and the barb 33 in this case substantially corresponds to the spacing between the two eyes 14 on the protective shield 11. Starting from the head 32, the lug element 30 extends further with a grip section 35 beyond the barb 33 by approximately 25% of the mentioned spacing.

[0040] If the contamination protection device 10 is located on an insulator cap 3 in such a way that the terminal element 7 of said insulator cap protrudes through the leadthrough opening 12, the lug element 30, which has previously separated from the protective shield 11, is pushed in through one eye 14, then led through the terminal element 7 and finally pushed through the other eye 14. Then, the lug element 30 can be pulled at the grip section 35 until the barb 33 latches in. The lug element 30 then bears with its head 32 against one eye 14 and with its barb 33 against the other eye 14 and is thereby already in principle secured in this position by the barb 33.

[0041] Additional securing is achieved by a cable tie 40, which is guided by guides 15 on the circumferential rim 13 in such a way that it extends beyond the head 32 of the lug element 30 and therefore secures said lug element in its position. If the cable tie 40 is drawn sufficiently tight, furthermore a friction fit is produced between the circumferential rim 13 and the terminal element 7 owing to the resultant elastic deformation of the circumferential rim 13, and this friction fit will further secure the contamination protection device 10 overall with respect to the insulator cap.

[0042] In order to be able to install the contamination protection device 10 even on an already installed high-voltage insulator 3, the protective shield 11 has a radial installation opening 17, which runs from the leadthrough opening 12 up to the outer edge 16 of the protective shield 11, for leading through the terminal element 7 of the insulator cap 5 laterally. In this case, pins 18 of a dovetail joint 19 are provided on both sides of the installation opening 17 for optionally closing the installation opening 17, as is shown in FIGS. 3a, b. In order to secure the dovetail joint 19 in the closed state, in each case one locking tab 18′ is provided at the end of some of the pins and a latching closure 20 is provided at the outer edge 16 of the protective shield 11, by means of which unintentional release of the dovetail joint 19, for example owing to the impact of wind, can be effectively avoided.

[0043] Starting from its outer edge 16, four apertures 21 are positioned on the protective shield 11, said apertures being capable of optionally being opened by virtue of the material covering the apertures 21 being removed. For this purpose, a depression is provided along the outer edge of each aperture 21, with it being possible for the material in question to simply be cut out there. The apertures 21 are arranged in such a way that they can be used in each case for leading through the fastening arm 6′ of an arc protection ring 6 in a specific configuration. Depending on the actual configuration, the suitable aperture 21 can be opened.

[0044] The apertures 21 are each surrounded on the upper side of the protective shield 11 by a rim 22, with which liquids and contamination accumulating on the protective shield 11 can be kept away from an open aperture 21.

[0045] The leadthrough opening 12 is surrounded on the lower side of the protective shield 11 by a fastening region 23 configured in the form of a hat, which fastening region can interact in form-fitting manner with the insulator cap 5 of a high-voltage insulator 3. Furthermore, radial reinforcing struts 24 are provided on the lower side of the protective shield 11, said struts imparting sufficient rigidity to the contamination protection device 10 despite the elasticity required for the installation in order that the contamination protection device 10 is not so severely deformed during wind loading that it can no longer perform its function.

[0046] The protective shield 11 is overall inclined towards the outer edge 16 such that, given proper installation, rain accumulating thereon flows away towards the outer edge 16. The outer edge 16 is in this case in the form of a drop edge.