JPS56150365A - Method for removing commercial frequency in cable fault point detection - Google Patents

Method for removing commercial frequency in cable fault point detection

Info

Publication number
JPS56150365A
JPS56150365A JP5271980A JP5271980A JPS56150365A JP S56150365 A JPS56150365 A JP S56150365A JP 5271980 A JP5271980 A JP 5271980A JP 5271980 A JP5271980 A JP 5271980A JP S56150365 A JPS56150365 A JP S56150365A
Authority
JP
Japan
Prior art keywords
commercial frequency
commercial
point detection
fault point
frequency components
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.)
Pending
Application number
JP5271980A
Other languages
Japanese (ja)
Inventor
Narutoshi Watanabe
Shinjiro Aoki
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.)
Furukawa Electric Co Ltd
Original Assignee
Furukawa Electric Co Ltd
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 Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Priority to JP5271980A priority Critical patent/JPS56150365A/en
Publication of JPS56150365A publication Critical patent/JPS56150365A/en
Pending 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)

Abstract

PURPOSE:To make highly accurate detection of fault points possible without receiving the influence of commercial frequencies by sampling a multiplicity of measuring signals in the common multiple time of the period of the commercial frequency thereby negating the superposed commercial frequency components. CONSTITUTION:Measuring voltages are sampled in multiplicity in the common multiple time of the period of a commercial frequency 50 or 60Hz, whereby the commercial frequency components are negated. For example, if the maximum input signals of an analog/digital converter 4 are assumed to be -5V-+5V, and the absolute value of the signal entering the converter 4 is assumed to be 7V, the superposed components of the commercial frequency are permitted up to 3Vp-p. If this signal is measured 300 times during, for example, 100ms, only the commercial frequency components are negated. Then, the fault point detection of high accuracy is made possible without receiving the influence of the commercial frequencies.
JP5271980A 1980-04-21 1980-04-21 Method for removing commercial frequency in cable fault point detection Pending JPS56150365A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5271980A JPS56150365A (en) 1980-04-21 1980-04-21 Method for removing commercial frequency in cable fault point detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5271980A JPS56150365A (en) 1980-04-21 1980-04-21 Method for removing commercial frequency in cable fault point detection

Publications (1)

Publication Number Publication Date
JPS56150365A true JPS56150365A (en) 1981-11-20

Family

ID=12922719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5271980A Pending JPS56150365A (en) 1980-04-21 1980-04-21 Method for removing commercial frequency in cable fault point detection

Country Status (1)

Country Link
JP (1) JPS56150365A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60262069A (en) * 1984-06-11 1985-12-25 Furukawa Electric Co Ltd:The Monitoring of deterioration in insulation of power cable
JPH0519003A (en) * 1991-07-09 1993-01-26 Railway Technical Res Inst Method for data sampling for multiple frequencies

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60262069A (en) * 1984-06-11 1985-12-25 Furukawa Electric Co Ltd:The Monitoring of deterioration in insulation of power cable
JPH0519003A (en) * 1991-07-09 1993-01-26 Railway Technical Res Inst Method for data sampling for multiple frequencies

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