EP1290657B1 - Gerät zum erfassen von überhitzung in einem linear-wärme-sensorkabel - Google Patents

Gerät zum erfassen von überhitzung in einem linear-wärme-sensorkabel 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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English (en)
French (fr)
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EP1290657A1 (de
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/de
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    • 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. Erfassungsgerät zur Erfassung der Stelle wo ein Feuer in der Nähe einer langen Erfassungsstrecke von z. B. 4.000 m und mehr brennt, die aus einem ein bekanntes Linear-Wärme-Sensorkabel (L.H.D.) bildenden Mittel besteht, das mit einem eigenen Endwiderstand versehen und durch einen eigenen gemeinsamen Rück-Kabel mit einer entfernten Kontrollstation verbunden ist, die das genannte Erfassungsgerät aufnimmt, das mit einer Spannungsquelle zur Erzeugung eines Speisestroms als ein in das das genannte L.H.D.-Kabel bildende Mittel gesandtes Signal versehen ist, wobei die Rückkehr von diesem genannten Signal zum genannten Prüfgerät die Integrität des genannten das L.H.D.-Kabel bildenden Mittels gewährleistet, wogegen ein von einem Kurzschluss/Feuer verursachten Spannungsabfall die Angabe auf einem Display einer Länge des L.H.D.-Kabels bewirkt, wo der Kurzschluss/das Feuer gerade erfolgt, wobei das Erfassungsgerät ferner:
    - eine vorbereitete elektronische Platte, die in der genannten eine einzige lange Erfassungsstrecke bildenden Erfassungsstrecke arbeitet, die aus diesem bekannten das L.H.D-Kabel bildenden Mittel besteht,
    - Mittel, die fähig sind, den Spannungsabfall zu messen, der zu einem Kurzschluss/Feuer in der genannten Strecke des L.H.D.-Kabels, ohne Rücksicht auf deren elektrischen Parameter, zurückzuführen ist, und
    - Vergleichsmittel, die fähig sind, den genannten Spannungsabfall mit voreingestellten gespeicherten Bezugsparametern zu vergleichen und diese genannten Spannungsabfalländerungen in eine auf einem Display angegebene Angabe umzuwandeln, die die zwischen dem Anfangsende der genannte Strecke des L.H.D.-Kabels und der Stelle (dem Punkt) in dieser Strecke bestehende Entfernung angibt, wo der Kurzschluss/das Feuer erfolgt,
    enthält.
  2. Erfassungsgerät nach Anspruch 1, in einer Ausführung als ein sich in einer in einer entfernten Überwachungsstation befindenden Steuertafel aufzunehmenden Gerät, dadurch gekennzeichnet, dass das Erfassungsgerät:
    - eine von einer Spannungsquelle von 24 V gespeiste elektrische Schaltung, die eine Speisespannung von 15 Volt sowie Bezugspannungen von 10V und 12,5V liefert,
    - eine Eingangslinie vom L.H.D.-Kabel, die durch ein Bezugsrelais hindurch geführt und in seiner Bereitschaftstellung mit den Klemmen eines bipolaren Verbinders verbunden ist,
    - eine gedrückte Schaltungen aufweisende elektronisch arbeitende Platte, die zwei Konstantstromgeneratoren enthält, die einen Bezugswiderstand und die das genannte L.H.D.-Kabel enthaltende zu messende Linie speist,
    - einen Trimmer zum auf Null stellen der gemeinsamen Kabel, die mit dem genannten L.H.D.-Kabel verbunden sind,
    - einen Einstelltrimmer zur Steuerung der Schaltungsverstärkung,
    - einen Analogausgang von 0 bis 10V zwischen dem ersten Klemmenpaar der genannten elektronisch arbeitenden Platte und einen Analogausgang von 0 bis 20 mA zwischen dem zweiten Klemmenpaar der genannten elektronisch arbeitenden Platte, wobei die genannten Klemmenpaare getrennt zu verwenden sind,
    enthält.
  3. Erfassungsgerät nach Anspruch 1, in der Ausführung als ein tragbares Gerät, dadurch gekennzeichnet, dass das Erfassungsgerät:
    - eine Batterie mit einer Leistung von 9V,
    - ein voltmetrisches Modul in der genannten elektronisch arbeitenden Platte, das fähig ist, eine Referenzspannung zu liefern, die gleich wie ein Wert ist, der vorher nach den Parametern des genannten zu überwachenden L.H.D.-Kabels bestimmt wurde,
    - zwei den zu überwachenden L.H.D.-Kabel aufnehmende Klemmen,
    - zwei Dioden zum Schützen des Erfassungsgeräteinganges,
    enthält.
  4. Erfassungsgerät nach einem oder mehr der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der auf dem Display angegebene Abstand in Metern, Füße, u.s.w. der Abstand ist, der zwischen der Kurzschluss/Feuer-Stelle im genannten L.H.D.-Kabel und dem Anfang oder dem Ende des letzteren besteht.
  5. Erfassungsgerät nach einem oder mehr der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Rückstellung auf den Anfangszustand des Erfassungsgerätes durch Relais oder andere bekannte Mittel durchgeführt ist.
  6. Erfassungsgerät nach einem oder mehr der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Mittel zum Speichern von Alarmdaten und entstandenen Ereignissen enthalten sind.
  7. Erfassungsgerät nach einem oder mehr der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Erfassungsgerät für eine gleichzeitige oder sequentielle Überwachung von einer Mehrzahl von verschiedenen und beliebig installierten L.H.D.-Kabeln voreingestellt ist.
  8. Erfassungsgerät nach Anspruch 3 bis 7, dadurch gekennzeichnet, dass das Erfassungsgerät in einem schachtelartigen Behälter aufgenommen ist, der einen Display, ein Klemmenpaar zur Aufnahme der beiden Enden eines L.H.D.-Kabels, einen Hauptschalter, die genannte elektronisch arbeitende und gedrückte Schaltungen aufweisende Platte und Speisebatterien enthält.
  9. Erfassungsgerät nach einem oder mehr der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Erfassungsgerät für eine manuelle und/oder automatische Steuerung von Löschungssystemen für ortsbestimmte Feuer voreingestellt ist.
  10. Erfassungsgerät nach einem oder mehr der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Erfassungsgerät ferner ein eingegliedertes Mittel zur Unterscheidung zwischen einem im L.H.D.-Kabel stattfindenden Kurzshluss/Feuer und einem in den gemeinsamen Schaltungskabeln entstandenen Defekt, welche Schaltungskabeln mit dem genannten L.H.D.-Kabel entweder stromauf oder stromab mit dem letzteren verbunden sind, wobei das genannte Mittel durch die Kupplung der genannten elektronischen mit gedrückten Schaltungen versehenen Platte mit einer mit gedrückten Schaltungen versehenen bekannter "DSM" genannter Platte der Anmelderin für die Betriebsführung von Feuererfassungsgeräten gebildet ist.
EP01936809A 2000-05-25 2001-05-18 Gerät zum erfassen von überhitzung in einem linear-wärme-sensorkabel Expired - Lifetime EP1290657B1 (de)

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 (en) 2000-05-25 2001-05-18 Device to detect heating levels in excess in l.h.d cables

Publications (2)

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

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EP01936809A Expired - Lifetime EP1290657B1 (de) 2000-05-25 2001-05-18 Gerät zum erfassen von überhitzung in einem linear-wärme-sensorkabel

Country Status (6)

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EP (1) EP1290657B1 (de)
AT (1) ATE361514T1 (de)
AU (1) AU2001262667A1 (de)
DE (1) DE60128220D1 (de)
IT (1) IT1317566B1 (de)
WO (1) WO2001091076A1 (de)

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 (de) * 1978-11-10 1980-05-28 BICC Limited Ein verbessertes Feuerdetektionssystem
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 (de) 2003-03-12
WO2001091076A1 (en) 2001-11-29
DE60128220D1 (de) 2007-06-14
AU2001262667A1 (en) 2001-12-03

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