Dry-type high voltage cable termination

Patent metadata

Field	Value
Publication number	US-11705709-B2
Application number	US-202117236866-A
Country	US
Kind code	B2
Filing date	Apr 21, 2021
Priority date	Apr 28, 2020
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

The present disclosure relates to a dry-type cable termination comprising: a tubular support structure comprising: an insulator support comprising a frustoconical portion, wherein the insulator support is made of an electrically insulating non-metallic composite material having a tensile modulus of at least 11 GPa; and a screen tube; an insulating body at least partially externally covering and directly contacting the support structure; an elastomeric stress cone housed in the frustoconical portion and in direct contact to the frustoconical portion; an electrode, housed within the screen tube, connected with the stress cone and in electric contact with the screen tube.

First claim

What is claimed is:

1. A dry-type cable termination comprising:
a tubular support structure comprising:
an insulator support comprising a frustoconical portion, the insulator support being made of an electrically insulating non-metallic composite material having a tensile modulus of at least 11 GPa, and
a screen tube;

an insulating body at least partially externally covering and directly contacting the tubular support structure;
an elastomeric stress cone housed in the frustoconical portion and in direct contact to the frustoconical portion; and
an electrode, housed within the screen tube, connected with the stress cone and in electric contact with the screen tube.

2. The dry-type cable termination according to claim 1 , wherein the insulator support is made of a non-metallic composite material having a tensile modulus up to 30 GPa.

3. The dry-type cable termination according to claim 1 , wherein the insulator support is made of a non-metallic composite material having a flexural modulus of at least 11 GPa.

4. The dry-type cable termination according to claim 1 , wherein the support structure insulator support is made of fiber-glass.

5. The dry-type cable termination according to claim 1 , wherein the insulator support comprises a cylindrical portion in lower position with respect to the frustoconical portion.

6. The dry-type cable termination according to claim 1 , wherein the insulator support has a longitudinal axis and the frustoconical portion forms an angle with the longitudinal axis comprised between 1° and 15°.

7. The dry-type cable termination according to claim 6 , wherein the frustoconical portion forms an angle with the longitudinal axis comprised between 2° and 10°.

8. The dry-type cable termination according to claim 1 , wherein the screen portion is made of an electrically conductive material.

9. The dry-type cable termination according to claim 8 , wherein the screen portion is made of aluminum, copper, steel, and alloys or composites thereof.

10. The dry-type cable termination according to claim 1 , wherein the screen portion is made of an electrically insulating non-metallic composite material having a tensile modulus of at least 11 GPa and externally covered with a semiconductive layer.

11. The dry-type cable termination according to claim 1 , wherein the insulating body is made of single material and one layer.

12. The dry-type cable termination according to claim 1 , wherein the insulating body is made of two portions enclosing, respectively, the insulator support and the screen tube.

13. The dry-type cable termination according to claim 1 , wherein the insulating body is made of a material fulfilling the requirement of IEC 60587 (2007).

14. The dry-type cable termination according to claim 1 , wherein the insulating body has a thickness ranging from 20 mm to 300 mm, extremes included.

15. The dry-type cable termination according to claim 1 , wherein the elastomeric stress cone is made of an elastomeric thermosetting material.

16. The dry-type cable termination according to claim 15 , wherein the elastomeric thermosetting material is selected from silicone rubber, ethylene propylene rubber (EPR) and ethylene propylene diene rubber (EPDM).

17. The dry-type cable termination according to claim 15 , wherein the stress cone is made of an insulating elastomeric thermosetting material having a relative dielectric permittivity of from 2.3 to 4.5.

18. The dry-type cable termination according to claim 1 , wherein the stress cone at least partially embeds a semiconductive deflector.

19. The dry-type cable termination according to claim 1 , wherein the electrode directly contacts the stress cone.

20. The dry-type cable termination according to claim 1 , wherein the electrode contacts the stress cone via an electrically conductive blocking ring.

21. The dry-type cable termination according to claim 1 , wherein the electrode contacts the screen tube via a connection belt.

22. The dry-type cable termination according to claim 21 , wherein the connection belt is made of an electrically conductive material or of a semiconductive material.

Assignees

• Prysmian Spa

Inventors

• Iadanza Andrea
• Boffi Paolo

Classifications

• H02G15/068 Primary

  connected to the cable shield only (H02G15/072 takes precedence) · CPC title

• H01R13/53

  Bases or cases for heavy duty; Bases or cases {for high voltage} with means for preventing corona or arcing · CPC title

• H02G15/064 Primary

  with devices for relieving electrical stress · CPC title

• H02G15/046 Primary

  with bores or protruding portions allowing passage of cable conductors · CPC title