EP1290657B1 - Dispositif permettant de detecter les niveaux de chauffage excedentaires dans les cables detecteurs de chaleur lineaire - Google Patents

Dispositif permettant de detecter les niveaux de chauffage excedentaires dans les cables detecteurs de chaleur lineaire Download PDF

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Publication number
EP1290657B1
EP1290657B1 EP01936809A EP01936809A EP1290657B1 EP 1290657 B1 EP1290657 B1 EP 1290657B1 EP 01936809 A EP01936809 A EP 01936809A EP 01936809 A EP01936809 A EP 01936809A EP 1290657 B1 EP1290657 B1 EP 1290657B1
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EP
European Patent Office
Prior art keywords
cable
detecting device
fire
fact
terminals
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.)
Expired - Lifetime
Application number
EP01936809A
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German (de)
English (en)
Other versions
EP1290657A1 (fr
Inventor
Antonio Villano
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.)
Thermostick Elettrotecnica Srl
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Thermostick Elettrotecnica Srl
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Publication of EP1290657A1 publication Critical patent/EP1290657A1/fr
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Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch

Definitions

  • This invention concerns a device for the detection of the alarm position of an alarm generated in a special cable defined as "Linear Heat Detector” (L.H.D.).
  • the L.H.D.'s are cables used for fire alarm signalisation when exposed to temperatures in excess of the selected minimum alarm level produced in the environment or in a plant, as for an example, but not exclusively, in highway-railways-underground tunnels, belt conveyors, electrical cabinets and power lines cable trays, transformers, flammable storage tanks, cooling towers, in warehouses and in any case in all those installations where, caused by attrition, by chemical reactions or by short-circuit there could be the conditions for the development of a fire and in which it's useful to identify as soon as possible the exact location of the danger, above all in case of great plants or of long length runs
  • An L.H.D. is an electrical twisted pair of stainless steel conductors cable provided with a special thermoplastic sensitive insulation which melts at selected temperature levels. When exposed to temperature in excess of the selected minimum alarm level the specific sensitive insulation melts allowing the conductors to short-circuit. It's, therefore, an on-off digital device.
  • the alarm condition is monitored through a fire control panel which monitors the status ( fire or fault) checking the current output from the control panel.
  • the main problem in plants with linear heat detectors installed is that the fire control panels management system can identify the status of alarm of the "zone" in which the cable is installed, but can't identify precisely the location in that zone, i.e. the distance from a conventional reference distance. This problem is particularly serious when, as in tunnels or in cable trays, the cable lengths are relevant.
  • EP-A-0 011 461 discloses a device for detecting in a long area to be attended a burning fire by using known L inear H eat D etector (L.H.D. cables). Said area which may have a length up to 4 Km or more are subdivided in a plurality of single discrete zones through which a L.H.D. cable runs. Each zone is provided with a resistor being series connected to the own traditional electrical conductor of said L.H.D. cable. In case of a burning fire the related zone is determined by the value of the measured voltage drop across the cable/resistor arrangement with the result being correlated to the zone and fed to a monitoring device.
  • L.H.D. cables L inear H eat D etector
  • US-A-3800216 discloses a device which makes use of traditional electrical conductors only and not of L.H.D. or heat sensitive cables which latter being specifically designed for fire detecting purposes.
  • the suggested device is designed for detecting the location of cable faults or short circuits in common electrical conductors and not for detecting the location of fire alarms by means of heat sensitive cables.
  • the object of the present invention is to provide a device which is able to identify the distance of alarm in any digital cable, no matter which is the manufacturer, or in other terms no matter which are the electrical parameters of the digital cable electrical features.
  • the device according to this invention is capable to display the location of alarm in meters or in feet or in any other measuring unit, and the display can be local in alphanumeric display or remote on a PC screen with a digital map or a drawing of the site, indicating the exact location of the fire.
  • the achieved precision is superior in the range of 1% to 3% max for length of cable over 4.000mt, with environmental temperature variation ranging from +/-20°C.
  • the device is realized in portable or fixed version , the portable one for maintenance purposes , the fixed one to be installed in electrical cabinet or control rooms.
  • the electronic unit features a microprocessor for measuring the voltage drop on L.H.D, comparing it with physical parameters stored in a memory as reference and in displaying locally or remotely via PC .
  • control unit is capable of discriminating short-circuit on L.H.D from a short-circuit on electrical junction cable or for its opening status ( as for example for interruption of its continuity )
  • the electronic board is powered via a 24VDC charger through a connector.
  • the power block generates a 15VDC - 10V-12,5V supply reference voltages .
  • Terminals are provided for L.H.D input, which is connected to a reference relay and in stand-by terminates on proper terminals;
  • This version of the circuit capable of detecting the voltage drop on a L. H.D. cable is powered through 9Vdc battery and is provided with :
  • the device is constituted by an electronic board capable of measuring the voltage drop on L.H.D. cable digital type of any manufacturer and to compare it to reference parameters and displaying it with a precision in the range 1-3% max, in function of the environment temperature of the L.H.D. in alarm, as described in the following examples.
  • Example 1 (electronic board, fixed version)
  • the circuit is powered at 24 V dc through a proper connector (variable with the control unit).
  • the circuit generates a 15 V dc voltage and 10 V dc-12,5 V dc reference voltages.
  • the input line from the L.H.D. in the field passes through a relay and in stand-by terminates on terminals.
  • two steady current generators power a reference resistor and the line to be measured.
  • the relay When an alarm is generated, via terminal, or via manual pressure, the relay changes over an amplifier circuit.
  • a trimmer zeroes the junction electrical cables resistance up to the beginning or the end of the L.H.D.
  • a resistor regulates the amplification of the circuit.
  • Example 2 (electronic board for portable version control units)
  • the electronic board is powered through a 9 V battery. Pressing the pushbutton, the voltmeter module is capable to produce a reference voltage proportional to the resistance calibration value, to set in function of the L.H.D. type, which has to be connected on provided terminals; two diodes are provided for a protection function.
  • the device according invention provides means to reset the system, to store the data, to acknowledge the alarm until problem resolution, and to sequentially investigate many zones of L.H.D.
  • the control unit is capable to control external devices for fire extinguishing.
  • the device operation is based on the current variation between a reference value and the alarm value. This variation in turn depends from the distance of the alarm point (i.e. of the L.H.D. resistance).
  • the circuitry sends continuously a signal into the cable and if the cable is whole the signal turns back unchanged. If on the contrary there is a short circuit the circuit measures the voltage drop and translates it in a reference value which is properly displayed.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)
  • General Induction Heating (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Cable Accessories (AREA)
  • Locating Faults (AREA)

Claims (10)

  1. Dispositif de détection pour détecter l'emplacement d'un feu se produisant près d'une section de détection longue, par exemple de 4000 m et plus, exécuté par un moyen formant câble de détection de chaleur linéaire (L.H.D.) qui présente une résistance d'extrémité propre et est relié au moyen d'un retour de câble commun propre à un poste de surveillance à distance logeant ledit dispositif de détection, pourvu d'une source de tension pour produire un courant d'alimentation comme signal transmis audit moyen formant câble L.H.D., où le retour dudit signal audit dispositif de vérification assure l'intégrité dudit moyen formant câble L.H.D., tandis qu'une chute de tension due à un court-circuit/feu provoque sur un affichage l'indication d'une longueur de câble L.H.D. dans laquelle le court-circuit/feu se produit, où il comprend en outre:
    - une carte électronique pré-arrangée fonctionnant dans ladite section de détection longue réalisée par ledit moyen formant câble L.H.D. connu formant une seule section de détection longue,
    - des moyens aptes à mesurer la chute de tension due à un court-circuit/feu dans ladite section de câble L.H.D. quels que soient ses paramètres électriques, et
    - des moyens de comparaison aptes à comparer ladite chute de tension à des paramètres de référence préréglés stockés et à tourner lesdites variations de chute de tension dans une indication sur ledit affichage indiquant la distance existant entre l'extrémité de départ de ladite section de câble L.H.D. et l'emplacement (point) sur cette dernière où le court-circuit/feu se produit.
  2. Dispositif de détection selon la revendication 1, dans un mode de réalisation comme un dispositif à loger dans un tableau de commande dans un poste de surveillance à distance, caractérisé en ce qu'il comprend:
    - un circuit électrique alimenté par une source de tension de 24 V et produisant une tension d'alimentation de 15 V ainsi que des tensions de référence de 10 V et de 12,5 V,
    - une ligne d'entrée du câble L.H.D. passant à travers un relais de référence et reliée dans sa position d'attente aux bornes d'un connecteur bipolaire,
    - une carte de fonctionnement électronique imprimée comprenant deux générateurs de courant constant alimentant une résistance de référence et la ligne à mesurer et contenant ledit câble L.H.D.,
    - un trimmer pour régler à zéro les câbles communs reliés audit câble L.H.D.,
    - un trimmer ajustable pour commander l'amplification du circuit,
    - une sortie analogique de 0 à 10 V entre le premier couple de bornes de ladite carte électronique fonctionnelle et une sortie analogique de 0 à 20 mA entre le second couple de bornes de ladite carte électronique fonctionnelle, où lesdits couples de bornes doivent être utilisés séparément.
  3. Dispositif de détection selon la revendication 1, dans le mode de réalisation comme un dispositif portable, caractérisé en ce qu'il comprend:
    - une batterie d'une puissance de 9 V,
    - un module voltmétrique dans ladite carte électronique fonctionnelle apte à produire une tension de référence égale à une valeur qui a été déterminée avant en accord avec les paramètres dudit câble L.H.D. à surveiller,
    - deux bornes logeant le câble L.H.D. à surveiller,
    - deux diodes pour protéger l'entrée du dispositif de détection.
  4. Dispositif de détection selon l'une ou plusieurs des revendications précédentes, caractérisé par le fait que la distance indiquée en mètres, pieds, etc. sur l'affichage est la distance existant entre l'emplacement du court-circuit/feu dans ledit câble L.H.D. et soit le début soit la fin de celui-ci.
  5. Dispositif de détection selon l'une ou plusieurs des revendications précédentes, caractérisé par le fait que la remise à l'état initial du dispositif de détection est effectuée au moyen de relais ou d'autres moyens connus.
  6. Dispositif de détection selon l'une ou plusieurs des revendications précédentes, caractérisé par le fait qu'il comprend un moyen pour stocker des données d'alarme et des événements survenus.
  7. Dispositif de détection selon l'une ou plusieurs des revendications précédentes, caractérisé par le fait qu'il est pré-agencé pour une surveillance contemporaine ou séquentielle d'un nombre de câbles L.H.D. distincts posés sélectivement.
  8. Dispositif de détection selon les revendications 3 à 7, caractérisé par le fait qu'il est logé dans un récipient en forme de boîte logeant un affichage, un couple de bornes pour recevoir les deux extrémités d'un câble L.H.D., un commutateur principal, ladite carte fonctionnelle électronique à circuit imprimé et des batteries de puissance.
  9. Dispositif de détection selon l'une ou plusieurs des revendications précédentes, caractérisé par le fait qu'il est pré-agencé pour une commande manuelle et/ou automatique de systèmes d'extinction de feux localisés.
  10. Dispositif de détection selon l'une ou plusieurs des revendications précédentes, caractérisé par le fait qu'il comprend en outre un moyen incorporé pour distinguer un court-circuit/feu dans le câble L.H.D. d'un défaut se produisant dans les câbles de circuit communs reliés audit câble L.H.D. en amont et/ou en aval de celui-ci, ledit moyen étant formé par le couplage de ladite carte électronique à circuit imprimé avec une carte imprimé connue du demandeur appelé « DSM » pour la gestion des dispositifs de détection de feu.
EP01936809A 2000-05-25 2001-05-18 Dispositif permettant de detecter les niveaux de chauffage excedentaires dans les cables detecteurs de chaleur lineaire Expired - Lifetime EP1290657B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI200115 2000-05-25
IT2000MI001153A IT1317566B1 (it) 2000-05-25 2000-05-25 Apparecchiatura atta a rilevare la posizione di un allarme termico incavi termosensibili, utilizzabile sia per il montaggio in un quadro
PCT/IT2001/000251 WO2001091076A1 (fr) 2000-05-25 2001-05-18 Dispositif permettant de detecter les niveaux de chauffage excedentaires dans les cables detecteurs de chaleur lineaire

Publications (2)

Publication Number Publication Date
EP1290657A1 EP1290657A1 (fr) 2003-03-12
EP1290657B1 true EP1290657B1 (fr) 2007-05-02

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ID=11445113

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Application Number Title Priority Date Filing Date
EP01936809A Expired - Lifetime EP1290657B1 (fr) 2000-05-25 2001-05-18 Dispositif permettant de detecter les niveaux de chauffage excedentaires dans les cables detecteurs de chaleur lineaire

Country Status (6)

Country Link
EP (1) EP1290657B1 (fr)
AT (1) ATE361514T1 (fr)
AU (1) AU2001262667A1 (fr)
DE (1) DE60128220D1 (fr)
IT (1) IT1317566B1 (fr)
WO (1) WO2001091076A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100426332C (zh) * 2006-12-20 2008-10-15 首安工业消防有限公司 一种用于不可恢复式线型感温探测器的短路报警方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257530A (en) * 1963-11-01 1966-06-21 John S Davies Heat-sensing cable
US3800216A (en) * 1971-08-11 1974-03-26 Dynatel Corp Cable fault locator apparatus and method with reference voltage comparison
EP0011461A1 (fr) * 1978-11-10 1980-05-28 BICC Limited Système perfectionné de détection du feu
DE3806058A1 (de) * 1988-02-26 1989-09-07 Philips Patentverwaltung Messvorrichtung zur widerstandsmessung
US5412374A (en) * 1994-05-24 1995-05-02 Clinton; Henry H. Method and apparatus for detecting and indicating the location of a high temperature zone along the length of a fire detecting cable

Also Published As

Publication number Publication date
ATE361514T1 (de) 2007-05-15
ITMI20001153A0 (it) 2000-05-25
IT1317566B1 (it) 2003-07-09
ITMI20001153A1 (it) 2001-11-25
EP1290657A1 (fr) 2003-03-12
WO2001091076A1 (fr) 2001-11-29
DE60128220D1 (de) 2007-06-14
AU2001262667A1 (en) 2001-12-03

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