DE3016131A1 - Nachrichtenkabel mit einer vorrichtung zur bestimmung des feuchtezustandes - Google Patents
Nachrichtenkabel mit einer vorrichtung zur bestimmung des feuchtezustandesInfo
- Publication number
- DE3016131A1 DE3016131A1 DE19803016131 DE3016131A DE3016131A1 DE 3016131 A1 DE3016131 A1 DE 3016131A1 DE 19803016131 DE19803016131 DE 19803016131 DE 3016131 A DE3016131 A DE 3016131A DE 3016131 A1 DE3016131 A1 DE 3016131A1
- Authority
- DE
- Germany
- Prior art keywords
- water
- conductor
- bare
- insulated
- 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- Withdrawn
Links
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
- H01B7/322—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks comprising humidity sensing means
Landscapes
- Insulated Conductors (AREA)
Description
-
- Nachrichtenkabel mit einer Vorrichtung zur Bestimmung des Feuchtezustandes Die Erfindung bezieht sich auf ein Nachrichtenkabel mit mehreren isolierten Aderpaaren und mit einer Vorrichtung zur Bestimmung des Feuchtezustandes des Kabels in Form eines Meldepaares.
- Vielpaarige, nicht längswasserdichte Nachrichtenkabel, deren Seele aus kunstatsffisolierten Adern besteht, enthalten einen Leerraum von etwa 45 96 des Seelenquerschnittes. Bei einer Beschädigung des Kabelmantels oder bei einem versehentlich offenen Kabelende kann sich daher relativ viel Wasser zwischen den einzelnen Adern innerhalb des Kabels ansammeln. Dadurch werden aber die Der tragungseigenschaften des Kabels erheblich beeinträchtigt. In dem vom Wasser betroffenen Kabelabschnitt kann die Betriebakapazität bis auf den dreifachen Wert ansteigen. Der Isolationswiderstand kann sich vermindern, und unter ungünstigen Umständen kann es während des späteren Betriebes aufgrund elektrolytischer Korrosion zur Unterbrechung von Sprechkreisen kommen.
- Es ist daher wichtig, eine Ansammlung von Wasser in einem Nachrichtenkabel rechtzeitig erkennen bzw. die Wasserfreiheit eines Kabels vor seiner Verlegung überprüfen zu können. Bisher wurde z. B. in einem Nachrichtenkabel ein Meldepaar mit eingeseilt, dessen Isolationswiderstand überwacht wurde. Als Meldepaar sind beispielsweise zwei besonders ausgebildete Adern verwendet worden, deren Isolation so beschaffen ist, daß der Isolationswiderstand beim Eindringen von Feuchte sich verändert. Insbesondere verwendet man zu diesem Zweck Meldeleiter mit einer perforierten Isolierung (DE-AS 10 59 062 und DE-OS 28 06 718). Außerdem ist es auch bekannt, innerhalb der Kabelseele ein Material anzuordnen, das bei Berührung mit Wasser einen Farbumschlag erleidet (DE-OS 23 20 478). Die Verwendung eines Farbindikators hat den Nachteil, daß eine nachträgliche Überprüfung des Kabels auf Wasseransammlung nur bei einer Zerstörung des Kabelmantels möglich ist.
- Der Erfindung liegt die Aufgabe zugrunde, eine leicht überprüfbare und mit geringem Aufwand herstellbare Vorrichtung zur Kontrolle des Feuchtezustandes in einem Nachrichtenkabel zu schaffen. Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß ein Meldepaar verwendet wird, das aus einem blanken und einem isolierten Leiter besteht, dessen Isolierung leicht wasserlöslich ist. Verwendet man ein solches Meldepaar und dringt Wasser in ein damit ausgerüstetes Nachrichtenkabel, wird sich in relativ kurzer Zeit die Isolierung der einen Meldeader auflösen, und es kommt zu einem Kontakt mit dem blanken Leiter des Meldepaares, der Jederzeit überprüfbar ist.
- Als leicht wasserlösliches Isoliermaterial bevorzugt man Polyvinylalkohol oder Polyäthylenoxyd.
- Um einen guten Kontakt bei Auflösung der Isolierung des einen Leiters des Meldepaares mit dem blanken Leiter sicherzustellen, empfiehlt es sich, beide Leiter miteinander zu verseilen. Der Kontakt kann auch dadurch verbessert werden, daß beide Leiter des Meldepaares gemeinsam mit einer Wendel umsponnen werden. Die Kontaktwirkung kann weiterhin erhöht werden dadurch, daß die Wendel aus einem gummielastischen Material besteht oder aus einem Material, das bei Wasserzutritt schrumpft.
- Die Erfindung wird anhand des in der Zeichnung dargestellten und nachfolgend beschriebenen Ausführungsbeispieles im einzelnen erläutert.
- In der einzigen Figur ist ein senkrechter Schnitt durch ein Meldepaar gemäß der Erfindung dargestellt. Das Meldepaar besteht aus einem blanken Leiter 10 und einem isolierten Leiter 11. Die Isolierung 12 des isolierten Leiters 11 ist leicht wasserlöslich ausgebildet. Sie besteht beispielsweise aus Polyvinylalkohol, das durch Extrusion auf den blanken Leiter aufgebracht worden ist.
- Beide Leiter sind mit einer Wendel aus einem elastischen oder bei Wasserzutritt schrumpfenden Material 13 umsponnen.
- 1 Figur 6 Ansprüche
Claims (6)
- Patentansprüche X \ Nachrichtenkabel mit mehreren isolierten Aderpaaren und mit einer Vorrichtung zur Bestimmung des Feuchtezustandes des Kabels in Form eines Meldepaares, d a d u r c h g e k e n n z e i c h n e t , daß das Meldepaar aus einem blanken (10) und einem isolierten Leiter (11) besteht, dessen Isolierung (12) leicht wasserlöslich ist.
- 2. Nachrichtenkabel nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß das Isoliermaterial der Ader (11) des Meldepaares Polyvinylalkohol oder PolyEthylenoxyd ist
- 3. Nachrichtenkabel nach Anspruch 1 oder 22 d a d u r C h g e k e n n z e 9 c h n e t , daß der blanke (10) und der isolierte Leiter (11) miteinander verseilt sind.
- 4. Nachrichtenkabel nach Anspruch 1 oder 2, d a du r c h g e k e n n z e i c h n e t , daß der blanke (10) und der isolierte Leiter (11) gemeinsam mit einer Wendel (13) umsponnen sind
- 5. Nachrichtenkabel nach Anspruch 4, d a d u r c h g e k e n n z e i c h ne t , daß die Wendel (13) aus einem gummielastischen Material besteht.
- 6. Nachrichtenkabel nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , daß die Wendel (13) aus einem Material besteht, das bei Wasserzutritt schrumpfte
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803016131 DE3016131A1 (de) | 1980-04-23 | 1980-04-23 | Nachrichtenkabel mit einer vorrichtung zur bestimmung des feuchtezustandes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803016131 DE3016131A1 (de) | 1980-04-23 | 1980-04-23 | Nachrichtenkabel mit einer vorrichtung zur bestimmung des feuchtezustandes |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3016131A1 true DE3016131A1 (de) | 1981-10-29 |
Family
ID=6101015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19803016131 Withdrawn DE3016131A1 (de) | 1980-04-23 | 1980-04-23 | Nachrichtenkabel mit einer vorrichtung zur bestimmung des feuchtezustandes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3016131A1 (de) |
Cited By (104)
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US4972179A (en) * | 1988-08-18 | 1990-11-20 | Junkosha Co., Ltd. | Liquid leakage detection apparatus including wheatstone bridge |
CN108470601A (zh) * | 2018-05-23 | 2018-08-31 | 江苏中利集团股份有限公司 | 一种具有监测线的电缆 |
EP3505078A3 (de) * | 2017-12-28 | 2019-07-31 | Ethicon LLC | Chirurgisches instrument mit einer reinen hardware-steuerschaltung |
US11202570B2 (en) | 2017-12-28 | 2021-12-21 | Cilag Gmbh International | Communication hub and storage device for storing parameters and status of a surgical device to be shared with cloud based analytics systems |
US11213294B2 (en) | 2018-03-28 | 2022-01-04 | Cilag Gmbh International | Surgical instrument comprising co-operating lockout features |
US11213359B2 (en) | 2017-12-28 | 2022-01-04 | Cilag Gmbh International | Controllers for robot-assisted surgical platforms |
US11234756B2 (en) | 2017-12-28 | 2022-02-01 | Cilag Gmbh International | Powered surgical tool with predefined adjustable control algorithm for controlling end effector parameter |
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-
1980
- 1980-04-23 DE DE19803016131 patent/DE3016131A1/de not_active Withdrawn
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