EP0896341A1 - Elektrisches Energiekabel für Brand- und Überlastverhinderung - Google Patents

Elektrisches Energiekabel für Brand- und Überlastverhinderung Download PDF

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Publication number
EP0896341A1
EP0896341A1 EP97830409A EP97830409A EP0896341A1 EP 0896341 A1 EP0896341 A1 EP 0896341A1 EP 97830409 A EP97830409 A EP 97830409A EP 97830409 A EP97830409 A EP 97830409A EP 0896341 A1 EP0896341 A1 EP 0896341A1
Authority
EP
European Patent Office
Prior art keywords
lead
power cable
control
electric power
insulating material
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Withdrawn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
EP97830409A
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English (en)
French (fr)
Inventor
Stefano Tiburzi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP97830409A priority Critical patent/EP0896341A1/de
Publication of EP0896341A1 publication Critical patent/EP0896341A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks
    • H01B7/324—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks comprising temperature sensing means

Definitions

  • the present invention relates to the safety of the installations and, more particularly, the fire prevention.
  • Thermosensitive cables capable of sensing the increase in the temperature of the room and/or the raceway in which they are laid are widely known.
  • Such cables which cannot be used as power cables, are essentially formed of two leads electrically insulated from each other by a thermosensitive material which melts at a predetermined temperature and shorts said leads. In other words, such cables act as a switch which closes at a determined temperature, thereby causing an alarm signal to be generated and/or anti-fire devices to be controlled.
  • a first problem of such thermosensitive cables described above is that they are not able to determine whether the increase in temperature is due to an overload in a power cable or to other causes such as a fire.
  • a second problem of such thermosensitive cables in case of overload is that it is not possible to detect exactly what power cable is overloaded.
  • a third problem of the known cables is that the room in the raceways could not be enough to lay a further cable beside the power cables.
  • the present invention seeks to overcome the above-mentioned problems of the prior art by providing a power cable which is capable of sensing any increase in its temperature due to either overload or environmental causes.
  • a cable comprising in combination: a power lead and a control lead insulated from each other by a low-melting insulating material and enclosed in a common external insulation coating.
  • thermosensitive control cable has two leads 1 insulated from each other by a low-melting coating 2, the whole assembly being enclosed in a cable sheath.
  • the two leads 1 contact each other, thereby causing an electric signal to pass from one cable to the other so as to give to an external circuit the information of the high increase in the temperature of the cable.
  • the increase in temperature may be caused by both a fire and an overload on one of the power cables enclosed in the raceway where the control cable is laid.
  • a cable shown in Fig. 2, provided with a power lead 3 embedded in a low-melting material 2 which insulates electrically the same from a control lead 4 coiled on the insulating material 2, the whole assembly being enclosed in an external sheath 5.
  • a power lead 3 embedded in a low-melting material 2 which insulates electrically the same from a control lead 4 coiled on the insulating material 2, the whole assembly being enclosed in an external sheath 5.
  • the overheating will affect only such cable, while the other cables will be only initially subjected or not to a light heating.
  • the whole raceway will be heated so that more than one cable will reach the melting temperature of their own low-melting insulating material 2.
  • control lead can be connected to a "release" device, such as a relay, which disconnects the power lead 3 whenever the latter contacts the control lead 4.
  • a "release" device such as a relay
  • the electric current flowing in the power lead 3 also supplies such relay through the control lead 4 when the latter contacts the power lead 3.
  • a second embodiment of the invention shown in Fig. 3, consists of a power cable provided with a power lead 3 surrounded by two or more control leads 4A, 4B, 4C coated by insulating materials 2A, 2B, 2C, respectively.
  • insulating materials melt at different temperatures, the highest of which can be borne by the power cable for its next operation.
  • the power cable according to the invention further allows separate, additional cables (control cables) to be avoided, thus reducing the "crowding" of the raceways. It is evident that the power lead 3 has a section greater than that of any control lead 4, 4A, 4B, 4C. In the preferred embodiments each control lead 4, 4A, 4B, 4C is coiled on the power lead 3 so that the melting of the coating of each control lead causes the electric contact between the latter and the power lead itself.
  • the present invention has been described and illustrated according to preferred embodiments thereof, however, it should be understood that those skilled in the art can make modifications and/or equivalent replacements without departing from the scope of the present industrial invention.

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  • Insulated Conductors (AREA)
EP97830409A 1997-08-04 1997-08-04 Elektrisches Energiekabel für Brand- und Überlastverhinderung Withdrawn EP0896341A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97830409A EP0896341A1 (de) 1997-08-04 1997-08-04 Elektrisches Energiekabel für Brand- und Überlastverhinderung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97830409A EP0896341A1 (de) 1997-08-04 1997-08-04 Elektrisches Energiekabel für Brand- und Überlastverhinderung

Publications (1)

Publication Number Publication Date
EP0896341A1 true EP0896341A1 (de) 1999-02-10

Family

ID=8230749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97830409A Withdrawn EP0896341A1 (de) 1997-08-04 1997-08-04 Elektrisches Energiekabel für Brand- und Überlastverhinderung

Country Status (1)

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EP (1) EP0896341A1 (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3375477A (en) * 1963-07-22 1968-03-26 Kawazoe Toshinobu Overheat detector for electric blankets and the like
US5633775A (en) * 1996-05-14 1997-05-27 Scarelli; David F. Fire sentry power cable

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3375477A (en) * 1963-07-22 1968-03-26 Kawazoe Toshinobu Overheat detector for electric blankets and the like
US5633775A (en) * 1996-05-14 1997-05-27 Scarelli; David F. Fire sentry power cable

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