GB446347A - Improvements in electric cable systems - Google Patents

Improvements in electric cable systems

Info

Publication number
GB446347A
GB446347A GB3087934A GB3087934A GB446347A GB 446347 A GB446347 A GB 446347A GB 3087934 A GB3087934 A GB 3087934A GB 3087934 A GB3087934 A GB 3087934A GB 446347 A GB446347 A GB 446347A
Authority
GB
United Kingdom
Prior art keywords
pipes
diaphragms
gas
pressure
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.)
Expired
Application number
GB3087934A
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.)
WT Henleys Telegraph Works Co Ltd
Original Assignee
WT Henleys Telegraph Works 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
Priority to NL43725D priority Critical patent/NL43725C/xx
Priority to BE411386D priority patent/BE411386A/xx
Application filed by WT Henleys Telegraph Works Co Ltd filed Critical WT Henleys Telegraph Works Co Ltd
Priority to GB3087934A priority patent/GB446347A/en
Priority to FR795713D priority patent/FR795713A/en
Priority to DEH145038D priority patent/DE649143C/en
Publication of GB446347A publication Critical patent/GB446347A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2838—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for cables
    • 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
    • G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/181—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for cables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
    • H02G15/28—Cable fittings for cables filled with or surrounded by gas or oil structurally associated with devices for indicating the presence or location of non-electric faults

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

446,347. Indicating leaks in gas-filled cables. HENLEY'S TELEGRAPH WORKS CO., Ltd., W. T., 11, Holborn Viaduct, London, and DUNSHEATH, P., Hesket, Church Avenue, Sidcup, Kent. Oct. 27, 1934, Nos. 30879/34 and 12436/35. [Class 99 (ii)] Leakage of gas from a faulty gas-filled cable comprising lengths of cable 5 with intermediate joints 3 is indicated by enclosing each cable length in a pipe or sheath 6 with a small clearance between the two and each joint similarly within a pipe or casing 4, and providing means for detecting any substantial rise in pressure in the several clearance spaces. The invention is shown applied to a threephase system employing single-core cables, of the kind described for example in Specification 400,929, [Group XXXVI], running side by side, separate leakage indicators 10 being provided for each group of three joints and each group of cable lengths which are connected to the clearance spaces of the latter by pipes 9, 11 respectively. Each indicator, Fig. 3, comprises a casing divided by two spring-loaded diaphragms 23 into three parts, to each of which one of the pipes 9 or 11 leads, the arrangement being such that a rise of pressure in one or two of the pipes 9 will cause one or both of the diaphragms to move. The diaphragms are fitted with a rod 31 having a projection 33 normally engaging one end of a catch 40 the other end of which holds a contact member 37 away from a plate 36, movement of the diaphragm in one direction or the other causing the catch to release the contact member to complete an electric circuit which includes an alarm signal 15 at an inspection station where apparatus is provided for locating the indicator at which contact has been made. The projection 33 has a laterally extending finger 45, Fig. 4, co-operating with two indicating collars 46 slidable on a fixed pin 47 so that any displacement of the projection is accompanied by movement of one of the collars ; thus by examining the collars in an indicator on which contact has been made the direction of movement of one or both of the diaphragms can be determined. The indicators may also be used for indicating faults in the pipes 4, 6 by filling the clearance spaces with gas at a pressure slightly above or below atmospheric pressure, e.g., an absolute pressure of 2 atmospheres or ¢ atmosphere respectively.
GB3087934A 1934-10-27 1934-10-27 Improvements in electric cable systems Expired GB446347A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL43725D NL43725C (en) 1934-10-27
BE411386D BE411386A (en) 1934-10-27
GB3087934A GB446347A (en) 1934-10-27 1934-10-27 Improvements in electric cable systems
FR795713D FR795713A (en) 1934-10-27 1935-09-18 Improvements made to electric cables
DEH145038D DE649143C (en) 1934-10-27 1935-09-19 Device for detecting leaks on cable sheaths of pressurized gas-filled electrical cable systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3087934A GB446347A (en) 1934-10-27 1934-10-27 Improvements in electric cable systems

Publications (1)

Publication Number Publication Date
GB446347A true GB446347A (en) 1936-04-27

Family

ID=10314542

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3087934A Expired GB446347A (en) 1934-10-27 1934-10-27 Improvements in electric cable systems

Country Status (5)

Country Link
BE (1) BE411386A (en)
DE (1) DE649143C (en)
FR (1) FR795713A (en)
GB (1) GB446347A (en)
NL (1) NL43725C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145233A (en) * 1983-08-17 1985-03-20 Telspec Ltd Testing the sealing of electrical cable joints and equipment housings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145233A (en) * 1983-08-17 1985-03-20 Telspec Ltd Testing the sealing of electrical cable joints and equipment housings

Also Published As

Publication number Publication date
DE649143C (en) 1937-08-16
BE411386A (en)
NL43725C (en) 1938-03-15
FR795713A (en) 1936-03-20

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