GB2276766A - Heat and compression detection cable - Google Patents

Heat and compression detection cable Download PDF

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Publication number
GB2276766A
GB2276766A GB9306873A GB9306873A GB2276766A GB 2276766 A GB2276766 A GB 2276766A GB 9306873 A GB9306873 A GB 9306873A GB 9306873 A GB9306873 A GB 9306873A GB 2276766 A GB2276766 A GB 2276766A
Authority
GB
United Kingdom
Prior art keywords
cable
ofthe
heat
compression
resistance
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Withdrawn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
GB9306873A
Other versions
GB9306873D0 (en
Inventor
John Cross Mcnab
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 GB9306873A priority Critical patent/GB2276766A/en
Publication of GB9306873D0 publication Critical patent/GB9306873D0/en
Publication of GB2276766A publication Critical patent/GB2276766A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
    • G01D5/165—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance by relative movement of a point of contact or actuation and a resistive track
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • 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
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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
    • 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
    • H01B7/10—Contact cables, i.e. having conductors which may be brought into contact by distortion of the cable
    • H01B7/102—Contact cables, i.e. having conductors which may be brought into contact by distortion of the cable responsive to heat
    • 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
    • H01B7/10—Contact cables, i.e. having conductors which may be brought into contact by distortion of the cable
    • H01B7/104—Contact cables, i.e. having conductors which may be brought into contact by distortion of the cable responsive to pressure
    • H01B7/106—Contact cables, i.e. having conductors which may be brought into contact by distortion of the cable responsive to pressure comprising concentric conductors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

A cable is capable of detecting the application of heat or pressure above a certain level at any point along its length; the location of the point can then be determined by a loop test. The cable described has an outer sleeve 1 of heat-shrinkable plastics and an outer braid or foil layer 2 spaced, e.g. by means of a helical wrap 6, from a core 4. The latter comprises a resistance wire 5 wrapped around an insulated wire or wires 7 used to carry current to the far end of the wire 5 for the loop test. <IMAGE>

Description

THIS INVENTION RELATES TO A ALE THAT CAN DETECT HEAT OR COMMPRESSiON ABOVE A CERTAIN LEVEr.IN RELATION TO THE CABLE LENGTH IT CAN ALSO DETECT THE RATE OF SPREAD OF ANY AFFECTED PART OF THE CABLE.
THE NEED FOR INFORMATION DURING A FIRE OR A SITUATION IS OF OBVIOUS IMPORTANCE.
THE CABLE CAN DETECT HEAT OR COMPRESSION ABOVE CERTAIN LEVELS. WHEN EITHER OR THE ABOVE CONDITIONS AFFECT THE CABLE.
IT IS POSSIBLE TO LOCATE THE POSITION IN RELATION TO THE CABLES LENGTH OF THE FIRST AFFECTED FART OF THE CABLE.
IT CAN THEN DETECT THE SPREAD OF THE AFFECTED AREA.USING SIMPLE SENSING ELECTRONIC CIRCUITS THE SPECIFIC EMBODIMENT OF THE INVENTION WILL NOW BE DESCRIBED BY WAY OF AN EXAMPLE WITH RE-FERENCE TO THE ACCOMPANYING DRAWINGS.
FIG.1 SHOWS THE CROSSECTION AND SAMPLE LENGTH OF THE CABLE.
FIG.2 SHOWS THE METHODS OF INFORMATION RECOVERY FROM THE CABLE.
THE CABLE WHOSE CROSSECTION AND SAMPLE LENGTH ARE SHOWN IN FIG 1 THE OUTER SLEEVE l OF THE CABLE IS MADE OF A HEAT SHRINKABLE PLASTIC WHICH AT NORMAL TEMPERATURE HAS ELASTIC DEFORMATION AND WHEN EXPOSED TO EXCESSIVE HEAT IT THEN SHRINKS WITH PLASTIC DEFORMATION.
WHEN THE OUTER SLEEVE 1 COMPRESSES EITHER DUE TO HEAT OR PRESSURE IT CONNECTS THE BRAID FOIL OR COMPOSITE 2 TO THE CENTER CORE 4. THE CENTER CORE 4 IS MADE UP OF HIGH TEMPERATURE INSULATED WIRE 7 OR WIRES WRAPPED BY A RESISTANCE WIRE S.THE BRAID 2 IS ATTACHED TO THE INSIDE OF THE OUTER SLEEVE 9.
AN EXAMPLE OF A METHOD OF SPACING IS THE SPIRAL INNER 6 WHICH ALLOWS THE CABLE TO BE EASILY HANDLED BUT RESPOND TO HEAT OR COMPRESSION.
THE RESISTANCE WIRE 5 IS THE METHOD OF DISTANCE MEASUREMENT WITHIN THE CABLE AS SHOWN IN FIG 2 A WHICH IS IN THE FORM OF A POTENTIOMETER FOR THE FIRST AFFECTED PART OF THE CABLE.
ONE OF THE HIGH TEMPERATURE WIRES 7 IN THE CENTER CORE 4 CONNECTS TO THE RESISTANCE WIRE TO SUPPLY THE VOLTAGE ACROSS THE RESISTANCE WIRE AND ALSO TO GIVE A CURRENT LOOP CHECK ON THE CABLE ITSELF TO ACT AS A FAILSAFE.
THE VOLTAGE PICKED UP FROM THE FIRST CONTACT IS RETURNED VIA THE BRAID 2 TO A SUITABLE DETECTION CIRCUIT.
WHEN THE AFFECTED AREA OF THE CABLE SPREADS THE POTENTIOMETER METHOD BECOMES LESS RELIABLE TO DETECT-DISTANCE SO THE METHOD SHOWN IN FIG 2B BECOMES ACTIVE. THIS METHOD WORKS SIMPLY BY MEASURING THE RESISTANCE BETWEEN POINTS A AND C AND ALSO POINTS B AND C WITH THE RESISTANCE OF THE WIRE KNOWN THE POSITION AND SIZE OF THE AFFECTED AREA OF THE CABLE CAN BE CALCULATED .BEARING IN MIND THE FACT THAT THE CABLE HAS A PRESET TEMPERATURE TRIGGER LEVEL THIS CAN MINIMISE ERRORS DUE TO CHANGES IN THE RESISTANCE WIRE 5 WITH TEMPERATURE.
THE METHOD OF INSTALLATION IS BY THE USE OF SUITABLE CABLE FIXINGS WHICH DO NOT COMPRESS THE CABLE.
THE CALIBRATION OF THE CABLE IS ALSO VERY EASY AS THE ENGINEER CAN MAP OUT THE CABLE BY SIMPLY COMPRESSING THE CABLE AT DIFFERENT LENGTHS ALONG THE CABLES PATH AND TAKING VOLTAGE READINGS.

Claims (4)

1 A HEAT AND COMPRESSION DETECTION CABLE THAT CAN DETECT HEAT OR COMPRESSION ABOVE CERTAIN LEVELS.WHEN EITHER OF THE ABOVE CONDITIONS AFFECT THE CABLE IT IS POSSIBLE TO LOCATE THE POSITION IN RELATION TO THE CABLES LENGTH OF THE FIRST AFFECTED FART OF THE CABLE IT CAN THEN DETECT THE SPREAD OF THE AFFECTED AREA USING SIMPLE SENSING ELECTRONIC CIRCUITS.
2. A HEAT AND COMPRESSION DETECTING CABLE AS IN CLAIM 1 WHEREIN THE FIRST DETECTION CIRCUIT IS A POTENTIOMETER CIRCUIT WITH A CURRENT LOOP TO CHECK THE ACTIVE STATE OF THE CABLE.
3. A HEAT AND COMPRESSION DETECTING CABLE AS IN CLAIM 1.
WHEREIN THE SECOND DETECTION CIRCUIT IS A POTENTIAL DIVIDER RESISTANCE MEASURING CIRCUIT.
4. A HEAT AND COMPRESSION DETECTION CABLE SUBSTANTIALLY AS DESCRIBED HEREIN WITH REFERENCE TO FIG 1-2 OF THE ACCOMPANYING DRAWINGS.
Amendments to the claims have been filed as follows 1 A cable which detects and locates heat or compression above certain levels in relation to the cables length.
The cable consists of: A) A flexible outer sleeve made from a suitable heat shrinkable material capable of shrinking , whose inner surface is connected by a suitable method to an electrically conductive braid foil or composite.
B) The centre core ofthe cable consists of a single or multicore cable capable of withstanding high temperatures. A resistance material is attached to the outer surface by a suitable method.
C) The inner conducting surface ofthe outer sleeve is electrically isolated from the resistance material on the centre core by a suitable method, unless a force is applied in one ofthe following ways.
(1) External compressive loading acting on the cable above a certain level.
(2) Compression caused by the heat shrinkable outer sleeve reducing its internal cross-sectional area due to external temperatures above the activation temperature of the heat shrinkable material, causing the outer sleeve to shrink..
D) The resistance material on the centre core acts as the method of location in the following ways.
(1) The first affected part ofthe cable is located by a potentiometer method of information recovery.
(2) The spread of further affected parts ofthe cable is located by simple resistance measurements from each end ofthe cable, when used with suitable supply and detection circuitry.
2 A cable according to claim 1 in which the flexible outer sleeve is made of a suitable heat shrinkable material, capable of shrinking.
The existing art in heatshrink technologies make available various material properties which can be used in relation to various cable specifications, which could include the following : Trigger temperature, shrink ratio, flame retardency, type of emissions during fire conditions and material handling.
3 A cable according to claims 1-2 in which an electrically conductive braid foil or composite is attached to the inner surface ofthe outer heatshrink sleeve which can respond to compression.
4 A cable according to claim 1 in which the centre core consists of a single or multicore cable capable of withstanding high temperatures. A resistance material is attached to the outer surface by a suitable method.
The unused wires in the centre core could be used for other purposes.
5 A cable according to claims 1-4 in which the outer sleeve is electrically isolated from the resistance material attached on the centre core bv a suitable method.
6 A cable according to claims 1-5 which uses the resistance material to locate the first affected part by using as a potentiometer method of distance measurement.
The method for detecting the spread ofthe affected areas is by means of resistance measurement from the ends ofthe cable. With the resistance ofthe wire known, the position and size ofthe affected area ofthe cable can be calculated. Bearing in mind the fact that the cable has a preset trigger temperature level this can minimise errors due to changes in the resistance wire with temperature.
7 A cable according to claim 1 , substantially as herein before described with reference to figure 1 and figure 2 of the accompanying drawings.
GB9306873A 1993-04-01 1993-04-01 Heat and compression detection cable Withdrawn GB2276766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9306873A GB2276766A (en) 1993-04-01 1993-04-01 Heat and compression detection cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9306873A GB2276766A (en) 1993-04-01 1993-04-01 Heat and compression detection cable

Publications (2)

Publication Number Publication Date
GB9306873D0 GB9306873D0 (en) 1993-05-26
GB2276766A true GB2276766A (en) 1994-10-05

Family

ID=10733202

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9306873A Withdrawn GB2276766A (en) 1993-04-01 1993-04-01 Heat and compression detection cable

Country Status (1)

Country Link
GB (1) GB2276766A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7326852B2 (en) * 2003-07-09 2008-02-05 Cnc Cable As String device
WO2013091871A1 (en) * 2011-12-22 2013-06-27 Phoenix Contact Gmbh & Co. Kg Photovoltaic system and interconnector for connecting a photovoltaic module
DE102017212476A1 (en) * 2017-07-20 2019-01-24 Leoni Kabel Gmbh CABLE WITH COAT ASSEMBLY FOR BENDING DETECTION
DE102017213382A1 (en) * 2017-08-02 2019-02-07 Leoni Kabel Gmbh sensor line
WO2020079072A1 (en) * 2018-10-17 2020-04-23 Robert Bosch Gmbh Line set for a charging station, charging station

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1193029A (en) * 1967-11-29 1970-05-28 Kabel Metallwerke Ghh Electric Contact Cable
US4134092A (en) * 1977-10-28 1979-01-09 General Electric Company Heat activatable electrical switch
US4453159A (en) * 1981-09-28 1984-06-05 Thermon Manufacturing Company Self-monitoring heat tracing system
GB2143979A (en) * 1983-06-30 1985-02-20 Raychem Corp Method for detecting and obtaining information about changes in variables
US4520352A (en) * 1983-06-20 1985-05-28 Fire Trumpet Of America, Inc. Fire alarm system and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1193029A (en) * 1967-11-29 1970-05-28 Kabel Metallwerke Ghh Electric Contact Cable
US4134092A (en) * 1977-10-28 1979-01-09 General Electric Company Heat activatable electrical switch
US4453159A (en) * 1981-09-28 1984-06-05 Thermon Manufacturing Company Self-monitoring heat tracing system
US4520352A (en) * 1983-06-20 1985-05-28 Fire Trumpet Of America, Inc. Fire alarm system and method
GB2143979A (en) * 1983-06-30 1985-02-20 Raychem Corp Method for detecting and obtaining information about changes in variables

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7326852B2 (en) * 2003-07-09 2008-02-05 Cnc Cable As String device
WO2013091871A1 (en) * 2011-12-22 2013-06-27 Phoenix Contact Gmbh & Co. Kg Photovoltaic system and interconnector for connecting a photovoltaic module
DE102017212476A1 (en) * 2017-07-20 2019-01-24 Leoni Kabel Gmbh CABLE WITH COAT ASSEMBLY FOR BENDING DETECTION
US10734136B2 (en) 2017-07-20 2020-08-04 Leoni Kabel Gmbh Cable with sheath arrangement for detecting bending
DE102017212476B4 (en) 2017-07-20 2023-03-23 Leoni Kabel Gmbh Cable with jacket arrangement for bend detection, arrangement for measuring a bend in a cable and method for measuring a bend in a cable
DE102017213382A1 (en) * 2017-08-02 2019-02-07 Leoni Kabel Gmbh sensor line
WO2020079072A1 (en) * 2018-10-17 2020-04-23 Robert Bosch Gmbh Line set for a charging station, charging station
US11865931B2 (en) 2018-10-17 2024-01-09 Robert Bosch Gmbh Line set for a charging station, charging station

Also Published As

Publication number Publication date
GB9306873D0 (en) 1993-05-26

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)