GB2249841A - Detecting cable faults - Google Patents

Detecting cable faults

Info

Publication number
GB2249841A
GB2249841A GB9119876A GB9119876A GB2249841A GB 2249841 A GB2249841 A GB 2249841A GB 9119876 A GB9119876 A GB 9119876A GB 9119876 A GB9119876 A GB 9119876A GB 2249841 A GB2249841 A GB 2249841A
Authority
GB
United Kingdom
Prior art keywords
resistance
cable
ground
armouring
measuring
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.)
Granted
Application number
GB9119876A
Other versions
GB2249841B (en
GB9119876D0 (en
Inventor
Nicholas James Frost
Richard William Fling
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.)
RADIODETECTION Ltd
Radiodetection Ltd
Original Assignee
RADIODETECTION Ltd
Radiodetection 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 RADIODETECTION Ltd, Radiodetection Ltd filed Critical RADIODETECTION Ltd
Publication of GB9119876D0 publication Critical patent/GB9119876D0/en
Publication of GB2249841A publication Critical patent/GB2249841A/en
Application granted granted Critical
Publication of GB2249841B publication Critical patent/GB2249841B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

Abstract

Faults in a cable (10) comprising an inner core (20) and conductive armouring (22) are detected in three stages. First, the existence of a fault is detected by measuring the resistance of the conductive armouring (22) and comparing this with the expected resistance of the armouring (22). This detection makes use of an alternating signal having a frequency less than 1 kHz. Then, the resistance of the cable is measured using measuring equipment (30) connected to the ground via three ground spikes (11A, 11B, 11C). By first measuring the resistance between each pair of ground spikes (11A, 11B, 11C), the resistance (Rg1) of one ground spike can be determined and this resistance can then be eliminated from the measurement of cable resistance. By repeating this operation at a remote point on the cable (10) using further measuring equipment (31) connected to ground via further ground spikes (12A, 12B, 12C) the location (13) and resistance value (Rf) of a fault in the cable (10) can be determined. Data may be transmitted between the measuring equipment (12, 13) at the frequency less than 1 kHz via the armouring. The use of a low frequency reduces capacitative effects.
GB9119876A 1989-03-23 1991-09-17 Detecting cable faults Expired - Fee Related GB2249841B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB898906825A GB8906825D0 (en) 1989-03-23 1989-03-23 Detecting cable faults

Publications (3)

Publication Number Publication Date
GB9119876D0 GB9119876D0 (en) 1992-01-02
GB2249841A true GB2249841A (en) 1992-05-20
GB2249841B GB2249841B (en) 1993-05-12

Family

ID=10653958

Family Applications (2)

Application Number Title Priority Date Filing Date
GB898906825A Pending GB8906825D0 (en) 1989-03-23 1989-03-23 Detecting cable faults
GB9119876A Expired - Fee Related GB2249841B (en) 1989-03-23 1991-09-17 Detecting cable faults

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB898906825A Pending GB8906825D0 (en) 1989-03-23 1989-03-23 Detecting cable faults

Country Status (2)

Country Link
GB (2) GB8906825D0 (en)
WO (1) WO1990011533A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2641588B2 (en) * 1990-03-09 1997-08-13 株式会社日立製作所 Power equipment and its abnormal location method
US5347212A (en) * 1992-09-09 1994-09-13 Bass Craig D System and method of use for conducting a neutral corrosion survey
US5691644A (en) * 1996-05-10 1997-11-25 Henkels & Mccoy Neutral corrosion condition survey-mitigating induced voltage effects
GB9617606D0 (en) * 1996-08-22 1996-10-02 Radiodetection Ltd Cable fault monitoring system
DE19725611C2 (en) * 1997-06-17 2001-03-08 Siemens Ag Monitoring method and monitoring device for a cable

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1825754A (en) * 1926-12-03 1931-10-06 Siemens Ag Apparatus for determining the distance to ground connections in electric conductors
US3800216A (en) * 1971-08-11 1974-03-26 Dynatel Corp Cable fault locator apparatus and method with reference voltage comparison
US4063161A (en) * 1975-04-14 1977-12-13 Joslyn Mfg. And Supply Co. Buried cable fault locator with earth potential indicator and pulse generator
EP0106790A1 (en) * 1982-09-14 1984-04-25 Asea Ab Method and apparatus for the localisation of a fault in a three-phase power line
EP0334310A1 (en) * 1988-03-25 1989-09-27 Asea Brown Boveri Ab Method and a device for fault location in the event of a fault on a power transmission line

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1825754A (en) * 1926-12-03 1931-10-06 Siemens Ag Apparatus for determining the distance to ground connections in electric conductors
US3800216A (en) * 1971-08-11 1974-03-26 Dynatel Corp Cable fault locator apparatus and method with reference voltage comparison
US4063161A (en) * 1975-04-14 1977-12-13 Joslyn Mfg. And Supply Co. Buried cable fault locator with earth potential indicator and pulse generator
EP0106790A1 (en) * 1982-09-14 1984-04-25 Asea Ab Method and apparatus for the localisation of a fault in a three-phase power line
EP0334310A1 (en) * 1988-03-25 1989-09-27 Asea Brown Boveri Ab Method and a device for fault location in the event of a fault on a power transmission line

Also Published As

Publication number Publication date
GB2249841B (en) 1993-05-12
GB8906825D0 (en) 1989-05-10
WO1990011533A3 (en) 1990-11-15
GB9119876D0 (en) 1992-01-02
WO1990011533A2 (en) 1990-10-04

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940323