EP2413331A1 - Flexible middle voltage (3.6/6 kV - 6/10 kV - 8.7/15 kV - 12/20 kV) electric cable resistant against fire, mechanical impacts and water jets, according to the Standard BS 7846:2009 CAT. F60 - Google Patents

Flexible middle voltage (3.6/6 kV - 6/10 kV - 8.7/15 kV - 12/20 kV) electric cable resistant against fire, mechanical impacts and water jets, according to the Standard BS 7846:2009 CAT. F60 Download PDF

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Publication number
EP2413331A1
EP2413331A1 EP11166844A EP11166844A EP2413331A1 EP 2413331 A1 EP2413331 A1 EP 2413331A1 EP 11166844 A EP11166844 A EP 11166844A EP 11166844 A EP11166844 A EP 11166844A EP 2413331 A1 EP2413331 A1 EP 2413331A1
Authority
EP
European Patent Office
Prior art keywords
cable
middle voltage
electric cable
voltage electric
improved
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11166844A
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German (de)
English (en)
French (fr)
Inventor
Angelo Brambilla
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Controlcavi Industria Srl
Original Assignee
Controlcavi Industria Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Controlcavi Industria Srl filed Critical Controlcavi Industria Srl
Publication of EP2413331A1 publication Critical patent/EP2413331A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones

Definitions

  • the present invention relates to a middle voltage fire resistant electric cable, simultaneously solving the following inevitable problems typical of a fire event:
  • the cable being mechanically stressed by folding it to a "U" shape according to the standard, is exposed, at the bent portion thereof, to a burner direct flame at a temperature greater than 830°C for a minimum period of 60 minutes (Cat. F 60).
  • Applicant's middle voltage cable accordingly, solves, even for high voltage levels of 12 / 20 KV, which are at present conventionally used due to continuously increasing installed power requirements, a first main problem, that is to resist against a direct fire or flame to provide people with a sufficient time period for evacuating the fire affected regions.
  • middle voltage electric cables power supply other types of already installed cables i.e. for low voltage power, control and measurement applications.
  • the inventive electric cable has the main characteristic of protecting the mentioned XLPE or HEPR insulating materials from "degenerating".
  • a second semiconductor material layer 2 is further co-extruded, indispensable in middle voltage cables due to its well known electric function.
  • the general inventive construction has been implemented accordingly, by replacing the inner sheath 7, usually constituted by a conventional halogen free elastomeric material, not susceptible to propagate fire, with a premium quality elastomeric material for the layer 4, and by increasing the number of very low thermal conductivity glass yarn material strips 6.
  • the inventive cable fully meets this standard requirement and has moreover a very high resistance against water jets, thereby providing a highly water impermeable electric cable.
  • Expensive safety apparatus and, accordingly, power cables supplying them must be adapted to continuously operate up to a complete extinguishing of the fire, while allowing persons affected by toxic fumes and gases, which are a primary cause of death, to quickly evacuate the fire regions.
  • the present invention just solves the above problem.
  • the copper strips 8, of a set suitable thickness, have a double function.
  • said strips provide the inventive middle voltage cable with electromagnetic compatibility (EMC) features.
  • the strips 8 weld to one another, thereby providing a copper continuous tube, which cannot be penetrated even by strong water jets so that, as demonstrated by practical tests, the inventive cable becomes a fully impermeable one.
  • the inventive cable comprises:
  • inventive cable further comprises the following elements:
  • An additional silicone insulating layer 4 with a thermal barrier function is provided.
  • Circular filling glass yarn strips 6 and 11 spoon finer material with a further thermal barrier function.
  • a silicone based inner sheath 7, operating as yet another thermal barrier is provided.
  • Copper self-welding strips 8 which can weld to one another as they are subjected to high temperatures, so to provide the inventive cable with water sealing properties.
  • a tinned copper thread reinforcement braid 9 which is usually coupled to the earth or ground and which may be made of galvanized steel or phosphorous bronze wires, and an outer sheath 12 which may be made of an elastomeric or thermoplastic material.
  • the inventive middle voltage electric cable 10 is characterized in that it comprises a plurality of copper wires or conductors 1 which are coated by a covering sheath 2 made of semi-conductor materials.
  • Said sheath 2 is in turn covered by an insulating layer 3, preferably made of an elastomeric material comprising an (HF HEPR) insulating compound.
  • the latter will start to degenerate so as to lose its chemical-physical features and electric insulating capability as a temperature threshold of 300°C is exceeded.
  • the HF HEPR insulating material sheath 3 is coated by an extruded silicone and ceramizing elastomeric layer 4.
  • One of the most important features of the inventive cable 10 is the use of an extruded ceramizing silicone elastomeric layer 4, providing a very efficient thermal barrier, while allowing the HF HEPR insulating material of the coating layer 3 not to exceed the temperature threshold of 250°C.
  • said HF HEPR layer 3 will not degenerate, thereby preserving its chemical-physical properties and electrically insulating capability, the degeneration of which, as stated, would occur if the layer 3 would exceed a temperature threshold of 300°C.
  • the cable is further provided with a screen or shield 5 constituted by a copper strip.
  • Said screen or shield 5 is wound as a strip proper on the single cable phases.
  • the cable 10 according to the present invention further comprises a thermally insulating layer including a plurality of glass fiber strips 6 covering in turn the copper inner sheath 5 or shield.
  • the inventive cable also comprises a sheath 7 made of an extruded ceramizing silicone elastomeric material providing both an electrical insulation and a thermal insulation.
  • the middle voltage electric cable 10 further comprises a copper strip 8 providing the cable with water sealing or impermeable properties.
  • the mentioned copper strip 8 as it is exposed to fire, is welded to itself thereby providing a tubular element adapted to protect the cable against water jets and sprays.
  • the inventive cable 10 further comprises a braid 9 made of tinned copper wires or yarns and galvanized steel or bronze-phosphorous wires operating as a mechanical reinforcing arrangement, which is coupled to the ground so to provide maximum safety against possible electrocution phenomena.
  • the inventive cable further comprises yet another glass yarn strip 11 operating to further increase the cable fire thermal resistance, as said cable is exposed to very high temperatures.
  • the cable 10 also comprises an outer sheath 12 made of an elastomeric or thermoplastic material.
  • the very high fire and water resistance properties of the inventive middle voltage cable 10 are given thereto, in particular, by one or more extruded ceramizing silicone elastomeric layers 4 and 7 and by glass yarn strips 6 and 11 which may be included either as a single strip or as multiple strips.
  • the above disclosed elements provide the inner layers of the inventive cable with a very high fire and water resistance, much greater than that of prior middle voltage electric cables, which, as above disclosed, have a very poor fire resistance and cannot resist to water jets since they would be subjected to abrupt shorts.
  • the improved middle voltage electric cable according to the invention has been thereinabove disclosed only by way of an illustrative but not limitative example.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Elimination Of Static Electricity (AREA)
EP11166844A 2010-07-27 2011-05-20 Flexible middle voltage (3.6/6 kV - 6/10 kV - 8.7/15 kV - 12/20 kV) electric cable resistant against fire, mechanical impacts and water jets, according to the Standard BS 7846:2009 CAT. F60 Withdrawn EP2413331A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2010A001377A IT1401143B1 (it) 2010-07-27 2010-07-27 Cavo elettrico flessibile di media tensione ( 3,6/6 kv - 6/10 kv - 8,7/15 kv - 12/20 kv ) resistente al fuoco, agli shock meccanici e ai getti d'acqua, in accordo ai requisiti della norma bs 7846:2009 cat. f60.

Publications (1)

Publication Number Publication Date
EP2413331A1 true EP2413331A1 (en) 2012-02-01

Family

ID=43739920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11166844A Withdrawn EP2413331A1 (en) 2010-07-27 2011-05-20 Flexible middle voltage (3.6/6 kV - 6/10 kV - 8.7/15 kV - 12/20 kV) electric cable resistant against fire, mechanical impacts and water jets, according to the Standard BS 7846:2009 CAT. F60

Country Status (2)

Country Link
EP (1) EP2413331A1 (it)
IT (1) IT1401143B1 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10515741B2 (en) 2015-12-09 2019-12-24 Prysmian S.P.A. Fire resistant electric cable
US10983296B2 (en) 2017-10-06 2021-04-20 Prysmian S.P.A. Fire resistant fiber optic cable with high fiber count
CN113096871A (zh) * 2021-04-14 2021-07-09 固达电线电缆(集团)有限公司 一种耐火中压电力电缆加工工艺
CN118197699A (zh) * 2024-04-16 2024-06-14 广东新亚光电缆股份有限公司 一种燃烧性能a级的nw型耐火电线电缆

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150249A (en) * 1977-01-12 1979-04-17 A/S Norsk Kabelfabrik Flame resistant cable structure
JPH05182752A (ja) * 1992-01-06 1993-07-23 Hitachi Cable Ltd ロードヒーティングケーブル
CN201489876U (zh) * 2009-08-26 2010-05-26 安徽华峰电缆集团有限公司 一种耐寒耐油型控制用软电缆

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150249A (en) * 1977-01-12 1979-04-17 A/S Norsk Kabelfabrik Flame resistant cable structure
JPH05182752A (ja) * 1992-01-06 1993-07-23 Hitachi Cable Ltd ロードヒーティングケーブル
CN201489876U (zh) * 2009-08-26 2010-05-26 安徽华峰电缆集团有限公司 一种耐寒耐油型控制用软电缆

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10515741B2 (en) 2015-12-09 2019-12-24 Prysmian S.P.A. Fire resistant electric cable
US10983296B2 (en) 2017-10-06 2021-04-20 Prysmian S.P.A. Fire resistant fiber optic cable with high fiber count
CN113096871A (zh) * 2021-04-14 2021-07-09 固达电线电缆(集团)有限公司 一种耐火中压电力电缆加工工艺
CN118197699A (zh) * 2024-04-16 2024-06-14 广东新亚光电缆股份有限公司 一种燃烧性能a级的nw型耐火电线电缆

Also Published As

Publication number Publication date
ITMI20101377A1 (it) 2012-01-28
IT1401143B1 (it) 2013-07-12

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