DE2807084A1 - Signalling line for locating leaks in cable or pipe - has single inner wire and outer protective copper mesh separated by absorbent tape - Google Patents

Signalling line for locating leaks in cable or pipe - has single inner wire and outer protective copper mesh separated by absorbent tape

Info

Publication number
DE2807084A1
DE2807084A1 DE19782807084 DE2807084A DE2807084A1 DE 2807084 A1 DE2807084 A1 DE 2807084A1 DE 19782807084 DE19782807084 DE 19782807084 DE 2807084 A DE2807084 A DE 2807084A DE 2807084 A1 DE2807084 A1 DE 2807084A1
Authority
DE
Germany
Prior art keywords
wire
insulating layer
conductor
metal shell
cable
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Withdrawn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
DE19782807084
Other languages
German (de)
Inventor
Friedrich Donath
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.)
Kabelmetal Electro GmbH
Original Assignee
KM Kabelmetal AG
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
Priority claimed from DE19762638609 external-priority patent/DE2638609A1/en
Application filed by KM Kabelmetal AG filed Critical KM Kabelmetal AG
Priority to DE19782807084 priority Critical patent/DE2807084A1/en
Publication of DE2807084A1 publication Critical patent/DE2807084A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/042—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid
    • G01M3/045—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid with electrical detection means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/165—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means by means of cables or similar elongated devices, e.g. tapes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/181—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for cables
    • 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
    • H01B7/322—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks comprising humidity sensing means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Insulated Conductors (AREA)

Abstract

The signalling line consists of a metal resistance wire (1) wrapped in 5mm-wide polyester tape, e.g. two layers wound in opposite directions (2, 3) each of thickness 0.1 mm. A mesh of copper wire (4) is wrapped around the outer layer to protect both layers from mechanical damage. Leaks are detected by measuring the resistance between the wire and the mesh. Leakage water penetrates through the mesh into the tape triggering an alarm. A given test voltage is then applied to the wire to determine the leaks's distance from the end. The line does not have to withstand large forces nor is there any need for a separate return line.

Description

Meldeader zur Anzeige und Ortung von LecksMessage headers for displaying and locating leaks

(Zusatz zu Patent ... (Patentanmeldung P 26 38 609.4)) Im Hauptpatent ist eine Meldeader zur Anzeige und Ortung von Lecks in elektrischen Kabeln oder wärmeisolierten Leitungsrohren beschrieben, insbesondere solchen die aus zwei koaxialen Rohren mit einer zwischen den Rohren angeordneten Wärmeisolierschicht besteht, die aus einem metallischen Leiter, vorzugsweise aus WiErstandsdraht und einer auf den Leiter aufgebrachten Isolierschicht aus saugfähigem Material besteht und als Leiter für eine Meßspannung dient, während als Rüdleiterchs metallische Innenrohr bzw. ein neben der Meldeader verlaufender Metalldraht dient und bei der die Isolierschicht der Meldeader aus Vliesstoffen besteht.(Addition to patent ... (patent application P 26 38 609.4)) In the main patent is a message leader for the display and location of leaks in electrical cables or heat-insulated pipes described, in particular those made of two coaxial Tubes with a heat insulating layer arranged between the tubes, which from a metallic conductor, preferably from resistance wire and one on the Conductor applied insulating layer consists of absorbent material and as a conductor is used for a measuring voltage, while Rüdleiterchs metallic inner tube or a metal wire running next to the signaling wire is used and for which the insulating layer the reporting wire is made of nonwovens.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Meldeader nach dem Hauptpatent dahingehend zu verbessern, daß diese nunmehr noch extremeren mechanischen Belastungen zu widerstehen vermag und darüber hinaus ggf.The present invention is based on the object of the message headers to improve according to the main patent in such a way that these are now even more extreme able to withstand mechanical loads and, moreover, if necessary

auf einen gesonderten Rückleiter verzichtet werden kann.a separate return conductor can be dispensed with.

Diese Aufgabe wird bei einer Meldeader dadurch gelöst, daß die Isolierschicht von einer für Feuchtigkeit durchlässigen Metallhülle umgeben ist. Diese Metallhülle schützt einmal die Isolierschicht vor mechanischer Beschädigung und kann darüber hinaus als Rückleiter dienen und einen ggf. vorgesehenen neben der Meldeader verlaufenden Metalldraht ersetzen. Wesentlich dabei ist, daß die Metallhülle für Feuchtigkeit durchlässig ist, so daß im Falle eines Schadensfalles die Feuchtigkeit die Isolierschicht durchtränken kann. Zweckmäßigerweise besteht die Metallhülle aus Kupfer, welches sich sehr einfach zu einem flexiblen Geflecht verarbeiten läßt. Aufgrund der hervorragenden Korrosionsbeständigkeit von Kupfer ist das Geflecht auch dann noch venendbar, wenn es über einen längeren Zeitraum mit Feuchtigkeit in Berührung gestanden hat.This object is achieved in the case of a message head in that the insulating layer is surrounded by a metal shell that is permeable to moisture. This metal shell protects the insulating layer from mechanical damage and can over it also serve as a return conductor and a possibly provided next to the message leader Replace metal wire. It is essential that the metal shell for moisture is permeable, so that in the event of damage, the moisture the insulating layer can soak. The metal shell is expediently made of copper, which can be processed very easily into a flexible mesh. Because of the excellent Corrosion resistance of copper, the braid can still be used even if it has been in contact with moisture for an extended period of time.

Mit besonderem Vorteil ist die Metallhülle als Geflecht ausgebildet. Diese Ausgestaltung ist äußerst flexibel, feuchtigkeitsdurchlässig und kann die Funktionstüchtigkeit der Meldeader aufrechterhalten, auch wenn einige der Geflechtdrähte zerstört sind.The metal shell is particularly advantageously designed as a braid. This configuration is extremely flexible, moisture-permeable and can Maintain the functionality of the signaling head, even if some of the braided wires are destroyed.

Die Erfindung ist anhand eines in der Figur schematisch dargestellten Ausführungsbeispiels näher erläutert.The invention is shown schematically on the basis of one in the figure Embodiment explained in more detail.

Wie im Hauptpatent beschrieben, besteht die Meldeader aus einem Metalldraht 1, vorzugsweise aus Widerstandsdraht auf der Basis von Nickel-Chrom bzw. Konstantan, auf dem eine erste Lage 2 eines Polyestervlieses aufgewickelt ist. Auf die Lage 2 wird mit gegenläufiger Schlagrichtung eine weitere Lage 3 Polyestervlies aufgewickelt.As described in the main patent, the reporting wire consists of a metal wire 1, preferably made of resistance wire based on nickel-chromium or constantan, on which a first layer 2 of a polyester fleece is wound. On the location 2 another layer 3 of polyester fleece is wound up in the opposite direction of lay.

Die Schichtdicke jeder Lage 2 und 3 beträgt 0,1 mm, während die Breite der Bänder 2a und 3a 5 mm beträgt. Beide Bänder 2 und 3 sind mit leichtem Zug auf den metallischen Leiter 1 aufgewickelt, um ein Gegeneinanderverschieben der Isolierschichten zu verhindern. Oberhalb der Isolierschicht 3 ist gemäß der Lehre der Erfindung ein Geflecht 4 aus einzelnen Kupferdrähten aufgebracht, welches dem mechanischen Schutz der Isolierschicht 3 bzw 2. dient.The layer thickness of each layer 2 and 3 is 0.1 mm, while the width of the bands 2a and 3a is 5 mm. Both bands 2 and 3 are open with a slight pull the metallic conductor 1 is wound to prevent the Insulating layers to prevent. Above the insulating layer 3 is a according to the teaching of the invention 4 braid made of individual copper wires, which provides mechanical protection the insulating layer 3 or 2. is used.

Zur Meldung eines Lecks in einer wärmeisolierten Rohrleitung wird der Isolationswiderstand zwischen dem Leiter 1 und dem Geflecht 4 gemessen. Bei Auftreten eines Lecks dringt das ausgetretene Leckwasser durch das Geflecht 4 in die Polyestervliesisolierung 2bzw. 3 und erniedrigt deren Isolationswiderstand. Hierdurch wird ein Alarm ausgelöst und an die Enden des Leiters 1 eine definierte Meßspannung angelegt, von der an der durchfeuchteten Stelle ein Teil abgegriffen und als Maß für die Entfernung der Leckstelle herangezogen werden kann.Used to report a leak in a thermally insulated pipe the insulation resistance between the conductor 1 and the braid 4 is measured. at If a leak occurs, the leaked water penetrates through the braid 4 in the polyester fleece insulation 2 or 3 and lowers their insulation resistance. This triggers an alarm and a defined one at the ends of the conductor 1 Measurement voltage applied, a part of which is tapped at the moistened point and can be used as a measure of the distance to the leak.

Durch die Verwendung des Geflechtes 4 als Rückleiter kann auf eine zusätzliche Ader verzichtet werden. Selbst wenn einige der das Geflecht 4 bildenden Drähte durch mechanische Zerstörung durchtrennt sind, bleibt die Funktionsfähigkeit des Geflechtes 4 als Rückleiter voll erhalten.By using the braid 4 as a return conductor, on a additional wire can be dispensed with. Even if some of those forming the braid 4 If wires are severed due to mechanical destruction, functionality remains of the braid 4 fully received as a return conductor.

Die Meldeader ist darüber hinaus hervorragend geeignet, in sogenannten Kanalsystem, beispielsweise Haubenkanälen Einsatz zu finden. Sie läßt sich mit besonderem Vorteil um die Isolierschicht wendelförmig herumlegen oder in Längsrichtung der Leitungsrohre am Boden des Kanals ohne besondere Isolationsmaßnahmen verlegen.The message leader is also ideally suited in so-called Channel system, for example hooded channels to be used. She deals with special Advantageously, wrap around the insulating layer in a spiral or in the longitudinal direction of the Lay conduits on the floor of the sewer without any special insulation measures.

Claims (3)

Patentansprüche Q).Meldeader zur Anzeige und Ortung von Lecks in elektrischen Kabeln oder wärmeisolierten Leitungsrohren, insbesondere solcheqdie aus zwei koaxialen Rohren mit einer zwischen den Rohren angeordneten Wärmeisolierschicht bestehen, die aus einem metallischen Leiter, vorzugsweise aus Widerstandsdraht und einer auf den Leiter aufgebrachten Isolierschicht aus saugfähigem Material besteht und als Leiter für eine Meßspannung dient, während als Rüeiter das metallische Innenrohr bzw. Claims Q). Reporting headers for displaying and locating leaks in electrical cables or heat-insulated conduits, especially those made of two coaxial tubes with a thermal insulation layer between the tubes consist of a metallic conductor, preferably made of resistance wire and an insulating layer made of absorbent material, which is applied to the conductor and serves as a conductor for a measuring voltage, while the metallic inner tube serves as a rider respectively. ein neben der Meldeader verlaufender Metalldraht dient und bei der die Isolierschicht der Meldeader aus Vliesstoffen besteht, nach Patent ... (Patentanmeldung P 26 38 609.4 vom 27.08.76), dadurch gekennzeichnet, daß die Isolierschicht von einer für Feuchtigkeit durchlässigen Metallhülle umgeben ist. a metal wire running next to the signaling head is used and the the insulating layer of the alarm wire consists of nonwovens, according to patent ... (patent application P 26 38 609.4 of 08/27/76), characterized in that the insulating layer of is surrounded by a moisture-permeable metal shell. 2. Meldeader nach Anspruch 1, dadurch gekennzeichnet, daß die Metallhülle aus Kupfer besteht. 2. Message reader according to claim 1, characterized in that the metal shell is made of copper. 3. Meldeader nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Metallhülle als Geflecht ausgebildet ist.3. Message reader according to claim 1 or 2, characterized in that the Metal shell is designed as a braid.
DE19782807084 1976-08-27 1978-02-18 Signalling line for locating leaks in cable or pipe - has single inner wire and outer protective copper mesh separated by absorbent tape Withdrawn DE2807084A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782807084 DE2807084A1 (en) 1976-08-27 1978-02-18 Signalling line for locating leaks in cable or pipe - has single inner wire and outer protective copper mesh separated by absorbent tape

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19762638609 DE2638609A1 (en) 1976-08-27 1976-08-27 Conductor for indicating and locating leaks in electrical cables - with insulating fleece-covered wire for measuring voltage
DE19782807084 DE2807084A1 (en) 1976-08-27 1978-02-18 Signalling line for locating leaks in cable or pipe - has single inner wire and outer protective copper mesh separated by absorbent tape

Publications (1)

Publication Number Publication Date
DE2807084A1 true DE2807084A1 (en) 1979-08-23

Family

ID=25770845

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782807084 Withdrawn DE2807084A1 (en) 1976-08-27 1978-02-18 Signalling line for locating leaks in cable or pipe - has single inner wire and outer protective copper mesh separated by absorbent tape

Country Status (1)

Country Link
DE (1) DE2807084A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239133A1 (en) * 1981-12-02 1983-06-09 Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel Monitoring line to confirm moisture locations
EP0113239A1 (en) * 1982-12-23 1984-07-11 BICC Public Limited Company An insulated pipe system
EP0289257A2 (en) * 1987-05-01 1988-11-02 Midwesco, Inc. Fluid detection cable with solid stranded dielectric elements
US5015958A (en) * 1983-06-30 1991-05-14 Raychem Corporation Elongate sensors comprising conductive polymers, and methods and apparatus using such sensors
US5235286A (en) 1985-06-12 1993-08-10 Raychem Corporation Method for detecting and obtaining information about changers in variables
US5382909A (en) 1983-06-30 1995-01-17 Raychem Corporation Method for detecting and obtaining information about changes in variables
US5422614A (en) * 1993-02-26 1995-06-06 Andrew Corporation Radiating coaxial cable for plenum applications

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239133A1 (en) * 1981-12-02 1983-06-09 Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel Monitoring line to confirm moisture locations
EP0113239A1 (en) * 1982-12-23 1984-07-11 BICC Public Limited Company An insulated pipe system
US5015958A (en) * 1983-06-30 1991-05-14 Raychem Corporation Elongate sensors comprising conductive polymers, and methods and apparatus using such sensors
US5382909A (en) 1983-06-30 1995-01-17 Raychem Corporation Method for detecting and obtaining information about changes in variables
US5235286A (en) 1985-06-12 1993-08-10 Raychem Corporation Method for detecting and obtaining information about changers in variables
EP0289257A2 (en) * 1987-05-01 1988-11-02 Midwesco, Inc. Fluid detection cable with solid stranded dielectric elements
EP0289257A3 (en) * 1987-05-01 1989-01-04 Andrew Corporation Fluid detection cable with solid stranded dielectric elements
US4910998A (en) * 1987-05-01 1990-03-27 Andrew Corporation Fluid detection system and method having a coaxial cable with solid, stranded dielectric elements
US5422614A (en) * 1993-02-26 1995-06-06 Andrew Corporation Radiating coaxial cable for plenum applications

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Legal Events

Date Code Title Description
8127 New person/name/address of the applicant

Owner name: KABELMETAL ELECTRO GMBH, 3000 HANNOVER, DE

8141 Disposal/no request for examination