GB549679A - Improvements in or relating to control and protective systems for electrical apparatus - Google Patents

Improvements in or relating to control and protective systems for electrical apparatus

Info

Publication number
GB549679A
GB549679A GB673441A GB673441A GB549679A GB 549679 A GB549679 A GB 549679A GB 673441 A GB673441 A GB 673441A GB 673441 A GB673441 A GB 673441A GB 549679 A GB549679 A GB 549679A
Authority
GB
United Kingdom
Prior art keywords
relay
pilot circuit
pilot
current
main switch
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
GB673441A
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and 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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Priority to GB673441A priority Critical patent/GB549679A/en
Publication of GB549679A publication Critical patent/GB549679A/en
Priority to FR932451D priority patent/FR932451A/en
Priority to NL137879A priority patent/NL67422C/xx
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/005—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for remote controlled apparatus; for lines connecting such apparatus
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2220/00—General furniture construction, e.g. fittings
    • A47B2220/11—Tripod parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B12/00—Jointing of furniture or the like, e.g. hidden from exterior
    • F16B12/44—Leg joints; Corner joints
    • F16B2012/443—Leg joints; Corner joints with two-dimensional corner element, the legs thereof being inserted in hollow frame members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B12/00—Jointing of furniture or the like, e.g. hidden from exterior
    • F16B12/44—Leg joints; Corner joints
    • F16B2012/446—Leg joints; Corner joints with three-dimensional corner element, the legs thereof being inserted in hollow frame members

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

549,679. Protective cut-out arrangements. REYROLLE & CO., Ltd., A., and FELCE, A. May 26, 1941, No. 6734. [Class 38 (v)] In a protective and control system for mining or other apparatus L which is connected to a main switch D1 over a trailing cable including a pilot circuit having, at the apparatus-end, a rectifier Kl for normally passing unidirectional current only, an earth - leakage protective arrangement for the power conductors is combined with similar protection for the pilot circuit itself. The core-balance transformer M in the main circuit has a secondary M1 connected to a leakage-relay H with its contacts H1 in the pilot circuit, and a further winding M2 in the pilot circuit. If, due to a leak between the pilot conductor B4 and the earth-sheath return, the normal unidirectional current is replaced by an alternating current, the winding M2 causes relay H to open the pilot circuit, thus de-energizing the pilot relay F and opening the main switch. In order to ascertain the location of the fault, the isolating switch Cl is opened, relay H is reset, and the isolating switch reclosed, and if the relay H again trips, the fault is in the pilot circuit since the main switch is open. The control switch K is of the type in which a resistance K2 is inserted in the running position to ensure that the main switch, when opened, cannot be reclosed without moving K to the starting position in which K2 is shortcircuited. Winding M2 may be shunted by a choke having low resistance to unidirectional, but high impedance to alternating, current, or it may be shunted by relay coil F, in which case the smoothing condenser or rectifier F2 may be omitted. There may also be provided a testswitch N and overload windings O1 ... 03, and a modification employing current-balance trans-' formers is also referred to. Transformer G may alternatively be connected to the busbars A1 ... A3 through a separate isolator operated conjointly with, or separately from, the isolator Cl.
GB673441A 1941-05-26 1941-05-26 Improvements in or relating to control and protective systems for electrical apparatus Expired GB549679A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB673441A GB549679A (en) 1941-05-26 1941-05-26 Improvements in or relating to control and protective systems for electrical apparatus
FR932451D FR932451A (en) 1941-05-26 1946-08-20 Improvements to control and protection devices for electrical devices
NL137879A NL67422C (en) 1941-05-26 1947-12-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB673441A GB549679A (en) 1941-05-26 1941-05-26 Improvements in or relating to control and protective systems for electrical apparatus

Publications (1)

Publication Number Publication Date
GB549679A true GB549679A (en) 1942-12-02

Family

ID=37872326

Family Applications (1)

Application Number Title Priority Date Filing Date
GB673441A Expired GB549679A (en) 1941-05-26 1941-05-26 Improvements in or relating to control and protective systems for electrical apparatus

Country Status (3)

Country Link
FR (1) FR932451A (en)
GB (1) GB549679A (en)
NL (1) NL67422C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2974261A (en) * 1957-09-24 1961-03-07 Lacheur Angus Guild Le Intrinsically safe switching system
GB2128047A (en) * 1982-10-05 1984-04-18 Northern Eng Ind Earth leakage monitor and earth proving apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2974261A (en) * 1957-09-24 1961-03-07 Lacheur Angus Guild Le Intrinsically safe switching system
GB2128047A (en) * 1982-10-05 1984-04-18 Northern Eng Ind Earth leakage monitor and earth proving apparatus

Also Published As

Publication number Publication date
FR932451A (en) 1948-03-23
NL67422C (en) 1951-02-15

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