GB807544A - Improvements in or relating to instruments for testing for earthing faults in electric circuits - Google Patents

Improvements in or relating to instruments for testing for earthing faults in electric circuits

Info

Publication number
GB807544A
GB807544A GB2982154A GB2982154A GB807544A GB 807544 A GB807544 A GB 807544A GB 2982154 A GB2982154 A GB 2982154A GB 2982154 A GB2982154 A GB 2982154A GB 807544 A GB807544 A GB 807544A
Authority
GB
United Kingdom
Prior art keywords
switch
transformer
earth
neutral
ammeter
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
GB2982154A
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.)
BRITISH CENTRAL ELECTRICAL COM
GEOFFREY CECIL MALKIN
Original Assignee
BRITISH CENTRAL ELECTRICAL COM
GEOFFREY CECIL MALKIN
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 BRITISH CENTRAL ELECTRICAL COM, GEOFFREY CECIL MALKIN filed Critical BRITISH CENTRAL ELECTRICAL COM
Priority to GB2982154A priority Critical patent/GB807544A/en
Publication of GB807544A publication Critical patent/GB807544A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

807,544. Electric tests. BRITISH CENTRAL ELECTRICAL CO. Ltd., and MALKIN, G. C. Jan. 16, 1956 [Oct. 15, 1954], No. 29821/54. Class 37. The secondary of a mains-fed transformer is used as a voltage source for testing appliances for earthing faults and a switch is provided to enable the transformer to test the continuity of both the earth and neutral conductor of the supply mains. As shown, a three-pin plug 16 is connected so that when plugged into a socket pin 13 is earthed and pins 14 and 15 connected to line and neutral respectively. Line and neutral are connected through the reversing switch 19 and switch 24 to the primary of transformer 25. The transformer secondary is connected to a two-way double-pole switch 32 which, in its upper position, connects the transformer secondary through ammeter 31 to the earth pin of a socket 35 in which the appliance to be tested is plugged and the wander lead 39 which is clipped to the frame of the appliance, and in its lower position connects the secondary through ammeter 31 to the line and neutral of the supply. Fuses 30 and an instantaneous thermal trip 42 are provided. In use, when plug 16 is joined to the mains one or other of gas discharge tubes 26, 27 fires. If tube 26 fires the line and neutral connection in plug 16 are connected. If tube 27 fires reversing switch 19 is operated. Switch 24 then connects the supply to the transformer primary. When switch 32 is in its upper position ammeter 31 indicates the current between the frame of the appliance and the earth connection. In the lower position, if there are no faults in the earth and neutral conductors of the supply mains, these two conductors are in series with the transformer secondary and ammeter 31 which may be calibrated in terms of line resistance. The ammeter may be provided with a shunt and a pair of scales or may be calibrated with a number of different scales appropriate to different supply voltages and transformer and meter impedances. A failure in the earth wire will light both lamps 26, 27. Reversing switch 54 enables the reading of the ammeter 31 to be connected for voltages between the earth and neutral by repeating these readings and taking the average. In an alternative embodiment (Fig. 2, not shown) a different type of reversing switch replaces switch 19 and a single discharge lamp connected between line and earth lights or not according as pins 14, 15 are correctly connected. Specification 543,660 is referred to.
GB2982154A 1954-10-15 1954-10-15 Improvements in or relating to instruments for testing for earthing faults in electric circuits Expired GB807544A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2982154A GB807544A (en) 1954-10-15 1954-10-15 Improvements in or relating to instruments for testing for earthing faults in electric circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2982154A GB807544A (en) 1954-10-15 1954-10-15 Improvements in or relating to instruments for testing for earthing faults in electric circuits

Publications (1)

Publication Number Publication Date
GB807544A true GB807544A (en) 1959-01-14

Family

ID=10297723

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2982154A Expired GB807544A (en) 1954-10-15 1954-10-15 Improvements in or relating to instruments for testing for earthing faults in electric circuits

Country Status (1)

Country Link
GB (1) GB807544A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205436A (en) * 1962-02-02 1965-09-07 Thomas M Donahue Method and apparatus for measuring impedance increases in the ground or protective ground wires leading to three-wire prong power receptacles
US3263164A (en) * 1961-10-10 1966-07-26 Louis G Solgere Electrical ground and polarity tester with thermally controlled switch means
US3317825A (en) * 1964-10-14 1967-05-02 James B Huff Three-wire ground type electrical receptacle tester
US3368146A (en) * 1966-05-25 1968-02-06 John E. Regan Electrical safety tester having a plurality of switches for setting up tests
US3383588A (en) * 1965-08-23 1968-05-14 Daniel Woodhead Company Three prong circuit tester for electrical outlet sockets including a frame means formed with adjacent chambers for housing visual indicators
US3561444A (en) * 1968-05-22 1971-02-09 Bio Logics Inc Ultrasonic drug nebulizer
US3579100A (en) * 1969-05-14 1971-05-18 Palmer R Lauver Flashlight adapted for short circuit testing
US3624498A (en) * 1969-09-09 1971-11-30 Charles Edward Smith Shockproof extension box including polarity testing means
US3696291A (en) * 1970-01-30 1972-10-03 Electronics Diversified Inc Equipment for detecting improper wiring in portable installation
US3810003A (en) * 1971-07-06 1974-05-07 Ecos Corp Device for determining improper reversal and/or short of ground and neutral lines and amount of impedance in ground line of a three-wire a.c. outlet
US4164702A (en) * 1976-11-22 1979-08-14 Pereda Eugene F Apparatus to test proper wiring of electrical wall receptacles especially if the ground and neutral wires are reversed with respect to the hot wire
US4164701A (en) * 1977-09-06 1979-08-14 Austin Lloyd M Portable device for testing electrical wiring circuits and power tools and equipment
GB2192066A (en) * 1986-06-25 1987-12-31 Martindale Protection Limited Mains supply tester
CN103605106A (en) * 2013-11-28 2014-02-26 国网安徽省电力公司淮南供电公司 Portable metering device on-site calibration working platform

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263164A (en) * 1961-10-10 1966-07-26 Louis G Solgere Electrical ground and polarity tester with thermally controlled switch means
US3205436A (en) * 1962-02-02 1965-09-07 Thomas M Donahue Method and apparatus for measuring impedance increases in the ground or protective ground wires leading to three-wire prong power receptacles
US3317825A (en) * 1964-10-14 1967-05-02 James B Huff Three-wire ground type electrical receptacle tester
US3383588A (en) * 1965-08-23 1968-05-14 Daniel Woodhead Company Three prong circuit tester for electrical outlet sockets including a frame means formed with adjacent chambers for housing visual indicators
US3368146A (en) * 1966-05-25 1968-02-06 John E. Regan Electrical safety tester having a plurality of switches for setting up tests
US3561444A (en) * 1968-05-22 1971-02-09 Bio Logics Inc Ultrasonic drug nebulizer
US3579100A (en) * 1969-05-14 1971-05-18 Palmer R Lauver Flashlight adapted for short circuit testing
US3624498A (en) * 1969-09-09 1971-11-30 Charles Edward Smith Shockproof extension box including polarity testing means
US3696291A (en) * 1970-01-30 1972-10-03 Electronics Diversified Inc Equipment for detecting improper wiring in portable installation
US3810003A (en) * 1971-07-06 1974-05-07 Ecos Corp Device for determining improper reversal and/or short of ground and neutral lines and amount of impedance in ground line of a three-wire a.c. outlet
US4164702A (en) * 1976-11-22 1979-08-14 Pereda Eugene F Apparatus to test proper wiring of electrical wall receptacles especially if the ground and neutral wires are reversed with respect to the hot wire
US4164701A (en) * 1977-09-06 1979-08-14 Austin Lloyd M Portable device for testing electrical wiring circuits and power tools and equipment
GB2192066A (en) * 1986-06-25 1987-12-31 Martindale Protection Limited Mains supply tester
CN103605106A (en) * 2013-11-28 2014-02-26 国网安徽省电力公司淮南供电公司 Portable metering device on-site calibration working platform
CN103605106B (en) * 2013-11-28 2016-05-11 国网安徽省电力公司淮南供电公司 Portable metering device field-checking workbench

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