HIGH-VOLTAGE INSULATOR HAVING AN ARC PROTECTION RING

Abstract

The invention relates to a high-voltage insulator (1) comprising a long rod-type insulator (10) having a shaft (11) and circular shields (12) which are arranged thereon, comprising an insulator cap (2) at the top end of the long rod-type insulator (10) for fastening the high-voltage insulator (1) to a high-voltage mast, and comprising an arc protection ring (3) which surrounds the insulator cap (2) or that portion of the long rod-type insulator (10) which is situated closest to the insulator cap (2), wherein at least the topmost shield (12) of the long rod-type insulator (10), which shield is situated closest to the insulator cap (2), is designed as a protective shield (12) for the other shields (12), wherein the maximum diameter of the other shields (12) is at least 30 mm smaller than the inside diameter of the arc protection ring (3), the diameter of the at least one protective shield (12) is at least 10 mm smaller than the inside diameter of the arc protection ring (3), and the diameter of the at least one protective shield (12) is at least 20 mm larger than the maximum diameter of the other shields (12).

Claims

1. A high-voltage insulator (1) comprising a long rod-type insulator (10) with a shaft (10) and circular shields (12) arranged thereon, an insulator cap (2) at the upper end of the long rod-type insulator (10) for fastening the high-voltage insulator (1) to a high-voltage mast, and an arc protection ring (3) which surrounds the insulator cap (2) or that portion of the long rod-type insulator (10) which is situated closest to the insulator cap (2), characterized in that at least the topmost shield (12) of the long rod-type insulator (10) that is situated closest to the insulator cap (2) is designed as a protective shield (12) for the other shields (12), wherein the maximum diameter of the other shields (12) is at least 30 mm smaller than the inside diameter of the arc protection ring (3), the diameter of the at least one protective shield (12) is at least 10 mm smaller than the inside diameter of the arc protection ring (3), and the diameter of the at least one protective shield (12) is at least 20 mm larger than the maximum diameter of the other shields (12).

2. The high-voltage insulator as claimed in claim 1, characterized in that the diameter of the at least one protective shield (12) is at least 17.5 mm and/or at most 42.5 mm smaller than the inner diameter of the arc protection ring (3).

3. The high voltage insulator as claimed in one of the preceding claims, characterized in that the diameter of the at least one protective shield (12) is at most 40 mm larger than the maximum diameter of the other shields (12).

4. The high-voltage insulator as claimed in one of the preceding claims, characterized in that the lowest shield (12), at the greatest distance from the insulating cap (2) at the topmost end of the long rod-type insulator (10), is designed corresponding to a protective shield (12).

5. The high-voltage insulator as claimed in one of the preceding claims, characterized in that at least one shield (12) that is not at one end of the long rod-type insulator (10) is designed as a protective shield (12).

6. The high-voltage insulator as claimed in one of the preceding claims, characterized in that at least two neighboring other shields (12) of the long rod-type insulator (10) have different overhangs.

7. The high-voltage insulator as claimed in one of the preceding claims, characterized in that the long rod-type insulator (10) comprises ten, preferably at least fifteen shields.

8. The high-voltage insulator as claimed in one of the preceding claims, characterized in that the long rod-type insulator (10) is made of ceramic or glass-fiber reinforced plastic.

Description

[0021] The invention will now be described by way of example on the basis of advantageous forms of embodiment with reference to the appended drawings. Here:

[0022] FIG. 1: shows a first exemplary embodiment of a high-voltage insulator according to the invention with an arc protection ring; and

[0023] FIG. 2: shows a second exemplary embodiment of a high-voltage insulator according to the invention with an arc protection ring.

[0024] A first exemplary embodiment of a high-voltage insulator 1 according to the invention is shown in FIG. 1.

[0025] The high-voltage insulator 1 comprises a long rod-type insulator 10 that is connected at its topmost end with an insulating cap 2. The high-voltage insulator 1, or a cross-member of a high-voltage mast, can be fastened through this insulator cap 2, which is designed as a fork cap. An insulator cap 2, also designed as a fork cap, is also provided at the bottom end of the long rod-type insulator 10. The high-voltage line can be fastened to this lower insulator cap 2.

[0026] Arc protection rings 3, 3 are arranged around each of the insulator caps 2, 2, and surround the respective ends of the long rod-type insulator 10. The arc protection rings 3, 3 are formed here as metal rings which, in the event of arc over the high-voltage insulator, can form foot points through which the arc current is dissipated to ground. The two arc protection rings 3, 3 can here comprise arcing horns in order to be self-extinguishing.

[0027] The long rod-type insulator 10 is made of ceramic, and comprises a shaft 11 with circular shields 12 arranged thereon. Twenty shields 12 are provided in the exemplary embodiment illustrated. The long rod-type insulator 10, and thereby also the shields 12, are largely implemented according to the DIN 48006/2 standard, wherein all of the shields 12 comprise drip edges 13 surrounding their outer edge. As a result, both the insulator caps 2, 2 and the arc protection rings 3, 3, can also be standardized components.

[0028] Varying from the said standard, however, the topmost shield 12 of the long rod-type insulator 10, i.e. the topmost insulator cap 2, is designed as a protective shield 12. Whereas the other shields 12 that are not designed as protective shields have a maximum diameter that is around 37.5 mm smaller than the inner diameter of the arc protection rings 3, 3, the diameter of the protective shield 12 is only about 17.5 mm smaller than the inner diameter of the topmost arc protection ring 3. The diameter of the protective shield 12 is thus around 20 mm larger than the maximum diameter of the other shields 12.

[0029] As a result of the design of the topmost shield 12 of the long rod-type insulator 10 as a protective shield 12, the other shields 12 lying underneath are protected from bird droppings. At the same time, the functionality of the arc protection rings 3, 3 is not restricted in any way.

[0030] A second exemplary embodiment of a high-voltage insulator 1 according to the invention is illustrated in FIG. 2. Many parts of the high-voltage insulator 1 are the same as those of FIG. 1, for which reason reference is made to the above explanations. As explained below, only the long rod-type insulator 10 is implemented differently from the exemplary embodiment according to FIG. 1.

[0031] The long rod-type insulator 10 is again made of ceramic, and comprises a shaft 11 and circular shields 12 arranged thereon, wherein, however, all respective adjacent shields 12 have different overhangs or diameters. The shields 12 are each implemented analogously to the DIN 48006/2 standard, and each compriseeven though not illustrated explicitly in FIG. 2a drip edge 13 (cf. FIG. 1).

[0032] The topmost shield 12 lying closest to the topmost insulator cap 2 of the long rod-type insulator 10, and a shield 12 located centrally and thus not at the end of the long rod-type insulator 10, are each designed as a protective shield 12, and the lowest shield located most closely to the lowest insulator cap 2 is designed corresponding to a protective shield 12. The shields 12 in question have a diameter that is about 17.5 mm smaller than the inner diameter of the two arc protection rings 3, 3. The diameter of these shields 12 is at the same time about 20 mm larger than the maximum diameter of those shields 12 that are not designed as protective shields 12 or corresponding to a protective shield 12. The diameter of the other shields 12 that are not designed as protective shields 12 is thus about 37.5 mm smaller than the inner diameter of the arc protection rings 3, 3, while the smaller of the other shields in the exemplary embodiment illustrated are around 47.5 mm smaller than the said inner diameter.

[0033] The protective shields 12 at the upper end and in the middle of the long rod-type insulator 10 offer a protection against soiling to the respective shields 12 lying underneath, in particular from bird droppings. The lowest shield 12 of the long rod-type insulator 10 that is designed corresponding to a protective shield 12, together with the other protective shields 12, essentially makes the transport and storage of the long rod-type insulator 10 in a horizontal orientation easier, including in particular before the insulator caps 2, 2 are attached to the long rod-type insulator 10.