EP0415082A1
Expired / Lapsed
EP
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Storable coating element for electrical cable joints for cables with different diameters
Assignee: Pirelli and C SpA
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Filing: 1990-07-26
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Granted: —
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Expires: 2010-07-26
Abstract
Abstract The invention relates to a storable coating element for electrical cable joints to be applied to several cables of different outer diameters, comprising a tubular support (11) and a sleeve (10) fitted thereon, in which the sleeve has one or more coaxial layers (10a, 10b, 10c) consisting of compounds of cross-linked polymeric materials, at least one of which (10b) is electrically insulating, and is fitted on the tubular support (11) under conditions of elastic radial expansion: the sleeve has a wall of great thickness and is expanded in a range comprised between a minimum value (D m ) given by an imposed expansion value corresponding to an instantaneous elastic return adapted to cause a predetermined degree of elastic interference with the smallest one of the intended cables, and a maximum value (D Ram ) corresponding to a permissible expansion value with respect to the ultimate expansion of the material used.
Inventors
- 👤 Ubaldo Vallauri
- 👤 Francesco Portas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 16:35
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/184; H01; H01R; H01R4/00; H01R4/70; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1352; Y10T428/139; Y10T428/1393
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
A storable coating element for electrical cable joints, to be applied to several cables of different outer diameters, comprising a tubular support (11) and a sleeve (10) fitted thereon, which sleeve has one or more coaxial layers (10a, 10b, 10c) consisting of compounds of cross-linked polymeric materials, at least one of which (10b) is electrically insulating and has a thickness of at least 6 mm, and is fitted on the tubular support (11) under conditions of elastic radial expansion, wherein the sleeve wall has an overall thickness equal to or greater than 8 mm, characterised in that at least the insulating layer (10b) in the sleeve is in a state of radial expansion on the tubular support (11) comprised between a minimum value (Dm) corresponding to an instantaneous residual deformation, after a stay of 24 months at room temperature under expanded conditions, which brings to a predetermined degree of elastic interference with the smallest one of the intended cables, and a maximum value (D Ram ) corresponding to a permissible expansion value with respect to the ultimate expansion of the material used, determined by maintaining a given expansion for at least 6 months at room temperature.
Claim 2
Dependent Claim
196 words
A storable coating element for electrical cable joints, to be applied to several cables of different outer diameters, comprising a tubular support (11) and a sleeve (10) fitted thereon, which sleeve has one or more coaxial layers (10a, 10b, 10c) consisting of compounds of cross-linked polymeric materials, at least one of which (10b) is electrically insulating and has a thickness of at least 6 mm, and is fitted on the tubular support (11) under conditions of elastic radial expansion, wherein the sleeve wall has an overall thickness equal to or greater than 8 mm, characterised in that at least the insulating layer (10b) in the sleeve is in a state of radial expansion on the tubular support (11) comprised between a minimum value (Dm) corresponding to an instantaneous residual deformation, after a stay of 24 months at room temperature under expanded conditions, which brings to a predetermined degree of elastic interference with the smallest one of the intended cables, and a maximum value (D Ram ) corresponding to a permissible expansion value with respect to the ultimate expansion of the material used, determined by maintaining a given expansion for at least 6 months at room temperature.
Claim 3
Dependent Claim
31 words
A storable coating element for cable joints according to claim 1, characterised in that the innermost layer (10a) of the sleeve is in an expansion state ranging from 120% to 320%.
Claim 4
Dependent Claim
90 words
A storable coating element for cable joints according to claim 1, characterised in that the insulating layer (10b) consists of a material exhibiting a residual deformation at an imposed radial expansion lower than or equal to 90% at an expansion of 320%, maintained for at least 40 days at 65°C or, alternatively, for two years at room temperature and at least the radially innermost layer of the sleeve exhibits an ultimate elongation greater than 250% at the normal operating temperature of the cable and greater than 350% at room temperature.
Claim 5
Dependent Claim
48 words
A storable coating element for cable joints according to claim 1, characterised in that the sleeve has three layers (10a, 10b, 10c, wherein the electrically insulating layer (10b) is the intermediate one and has a thickness equal to at least 80% of the overall thickness of the sleeve.
Claim 6
Dependent Claim
32 words
A storable coating element for cable joints according to claim 1, characterised in that the sleeve in the expanded state has a wall thickness in the range of 5 to 25 mm.
References Cited (Backward Citations)
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