FR2239173A5 - Broken strand detector for metallic cables - is particularly for suspension bridges and employs magnetic method using a movable induction coil - Google Patents

Broken strand detector for metallic cables - is particularly for suspension bridges and employs magnetic method using a movable induction coil

Info

Publication number
FR2239173A5
FR2239173A5 FR7327297A FR7327297A FR2239173A5 FR 2239173 A5 FR2239173 A5 FR 2239173A5 FR 7327297 A FR7327297 A FR 7327297A FR 7327297 A FR7327297 A FR 7327297A FR 2239173 A5 FR2239173 A5 FR 2239173A5
Authority
FR
France
Prior art keywords
coil
induction coil
gap
suspension bridges
metallic cables
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
Application number
FR7327297A
Other languages
French (fr)
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.)
Etat Francais
Original Assignee
Etat Francais
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 Etat Francais filed Critical Etat Francais
Priority to FR7327297A priority Critical patent/FR2239173A5/en
Application granted granted Critical
Publication of FR2239173A5 publication Critical patent/FR2239173A5/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

Broken strands in metallic cables such as those of suspension bridges and aerial ropeways are detected by a movable induction coil wound in two axial sections (1b, 1c) with a gap in between. This coil is excited by a.c. of about 100cs. A secondary coil is placed in the gap having two orthogonal coil windings (4, 5), each coil being at 45 deg. to the axis of the cable. The secondary coils are arranged so that there is no net induced voltage to pass to the meter (8). A discontinuity in the cable passing into the gap between the primary coils destroys the symmetry and results in an output, passing out at the other side a similar disturbance is recorded. The assembly is passed from end to end of the cable with means indicating distance gone at which a signal was generated.
FR7327297A 1973-07-25 1973-07-25 Broken strand detector for metallic cables - is particularly for suspension bridges and employs magnetic method using a movable induction coil Expired FR2239173A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7327297A FR2239173A5 (en) 1973-07-25 1973-07-25 Broken strand detector for metallic cables - is particularly for suspension bridges and employs magnetic method using a movable induction coil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7327297A FR2239173A5 (en) 1973-07-25 1973-07-25 Broken strand detector for metallic cables - is particularly for suspension bridges and employs magnetic method using a movable induction coil

Publications (1)

Publication Number Publication Date
FR2239173A5 true FR2239173A5 (en) 1975-02-21

Family

ID=9123126

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7327297A Expired FR2239173A5 (en) 1973-07-25 1973-07-25 Broken strand detector for metallic cables - is particularly for suspension bridges and employs magnetic method using a movable induction coil

Country Status (1)

Country Link
FR (1) FR2239173A5 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4827215A (en) * 1986-03-25 1989-05-02 Crucible, Societe Anonyme Method of and apparatus for magnetic saturation testing a wire rope for defects
CN107179479A (en) * 2017-06-12 2017-09-19 西安工程大学 Transmission pressure broken lot defect inspection method based on visible images

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4827215A (en) * 1986-03-25 1989-05-02 Crucible, Societe Anonyme Method of and apparatus for magnetic saturation testing a wire rope for defects
CN107179479A (en) * 2017-06-12 2017-09-19 西安工程大学 Transmission pressure broken lot defect inspection method based on visible images
CN107179479B (en) * 2017-06-12 2020-05-22 西安工程大学 Visible light image-based transmission conductor strand scattering defect detection method

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Legal Events

Date Code Title Description
ST Notification of lapse