GB654287A - Improvements in or relating to maintenance of conductivity between electrical elements - Google Patents

Improvements in or relating to maintenance of conductivity between electrical elements

Info

Publication number
GB654287A
GB654287A GB838/49A GB83849A GB654287A GB 654287 A GB654287 A GB 654287A GB 838/49 A GB838/49 A GB 838/49A GB 83849 A GB83849 A GB 83849A GB 654287 A GB654287 A GB 654287A
Authority
GB
United Kingdom
Prior art keywords
contact
segment
resistance
conductivity
circuit
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
GB838/49A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB654287A publication Critical patent/GB654287A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/60—Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces
    • H01H1/605—Cleaning of contact-making surfaces by relatively high voltage pulses
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage

Abstract

654,287. Couplings. SHERMAN, R., (formerly SCHEIRMANN, R.). Aug. 9, 1944, No. 838/49. Convention date, July 19, 1943. Divided out of 654,231. [Class 38 (i)] [Also in Group XXXVII] In a system for maintaining or improving the conductivity between contacts or contacting elements of a circuit, a voltage is applied across them to rupture any non-conductive layer. Fig. 1 shows the application of the invention to the system set out in Specification 654,231, in which the variations of contact resistance between an electrode 3 and its holder 2 of an electric furnace are tested, indicated and controlled. In this system a check circuit comprising a separate source of A.C. supply, a transformer 70, variable resistance 73 and a controller having positions A, B or C is used. In the present invention, the resistance 73 is adjusted and the controller is placed in position B to apply a suitable voltage across the electrode 3 and holder 2 to improve the contacting surfaces, the circuit being from transformer winding 72, through lines 78, 79, contact 156, segment 87, connection 86, segment 85, contact 147, line 14, voltage transformer winding 12, lines 13, 149, contact 148, segment 84, connection 83, segment 82, contact 155, line 76 and resistance 73 to the other end of winding 72. In a modification (Fig. 2, not shown), the system is applied to the junction of D.C. bus-bars, a D.C. potential being applied to improve the conductivity between the contacting surfaces.
GB838/49A 1943-07-19 1944-08-09 Improvements in or relating to maintenance of conductivity between electrical elements Expired GB654287A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US495311A US2459186A (en) 1943-07-19 1943-07-19 Testing and protection of electrical distribution systems

Publications (1)

Publication Number Publication Date
GB654287A true GB654287A (en) 1951-06-13

Family

ID=23968141

Family Applications (2)

Application Number Title Priority Date Filing Date
GB838/49A Expired GB654287A (en) 1943-07-19 1944-08-09 Improvements in or relating to maintenance of conductivity between electrical elements
GB15165/44A Expired GB654231A (en) 1943-07-19 1944-08-09 Improvements in testing and protection of electrical distribution systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB15165/44A Expired GB654231A (en) 1943-07-19 1944-08-09 Improvements in testing and protection of electrical distribution systems

Country Status (3)

Country Link
US (1) US2459186A (en)
DE (2) DE897734C (en)
GB (2) GB654287A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683820A (en) * 1948-10-20 1954-07-13 Sherman Alex Circuit protective variable ratio transformer system
NL7015436A (en) * 1970-10-22 1972-04-25
JPS526717B2 (en) * 1971-09-13 1977-02-24

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US528268A (en) * 1894-10-30 Ohmmeter
US292761A (en) * 1884-01-29 Joseph olmsted
US1089814A (en) * 1912-04-09 1914-03-10 George O Knapp Testing system and mechanism for electrical circuits.
US1214763A (en) * 1916-10-14 1917-02-06 Joseph Lawton Dixon Electrically-heated steel-furnace.
US1779347A (en) * 1922-01-07 1930-10-21 Weston Electrical Instr Corp Indicating bond tester
US1615648A (en) * 1924-04-29 1927-01-25 Westinghouse Electric & Mfg Co Measuring instrument
US1814869A (en) * 1925-08-20 1931-07-14 Gen Electric Circuit protection
US1697188A (en) * 1926-06-07 1929-01-01 Bbc Brown Boveri & Cie Electric-furnace construction
US1931862A (en) * 1927-05-16 1933-10-24 Felten Karl High tension switch
US1839148A (en) * 1929-08-14 1931-12-29 Albert E Greene Electric furnace and voltage control
US1825476A (en) * 1930-08-11 1931-09-29 Gen Steel Castings Corp Railway car structure
US1923565A (en) * 1930-08-30 1933-08-22 Ohio Brass Co Testing apparatus and method
US1919079A (en) * 1931-10-22 1933-07-18 Gen Electric Electrical instrument
US2044546A (en) * 1933-07-17 1936-06-16 Ryan Harry Michael Fault indicator and rectifier for electrical circuits of motor vehicles
FR771305A (en) * 1934-06-27 1934-10-04 Process for checking the quality of welds and devices for implementing this process
US2057845A (en) * 1935-07-13 1936-10-20 John R Pattee Electrical measuring instrument
US2125050A (en) * 1936-01-23 1938-07-26 Mack Mfg Corp Body charge indicator for trackless trolley coaches
US2218629A (en) * 1937-05-28 1940-10-22 Bell Telephone Labor Inc Protective device for electrical instruments
US2149756A (en) * 1937-11-13 1939-03-07 David L Arenberg Measuring apparatus
US2261686A (en) * 1937-12-31 1941-11-04 Westinghouse Electric & Mfg Co Circuit interrupter
US2221556A (en) * 1938-01-15 1940-11-12 Western Electric Co Electrical connector apparatus
US2232715A (en) * 1940-02-14 1941-02-25 George A Matthews Conductivity testing apparatus
US2307499A (en) * 1941-04-11 1943-01-05 Westinghouse Electric & Mfg Co Insulator testing
US2324458A (en) * 1942-03-18 1943-07-13 Melville F Peters Spark plug tester

Also Published As

Publication number Publication date
DE871184C (en) 1953-03-19
US2459186A (en) 1949-01-18
DE897734C (en) 1953-11-23
GB654231A (en) 1951-06-13

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