CA1027667A - Inverse time-overcurrent relay using successive linear approximations - Google Patents

Inverse time-overcurrent relay using successive linear approximations

Info

Publication number
CA1027667A
CA1027667A CA257,779A CA257779A CA1027667A CA 1027667 A CA1027667 A CA 1027667A CA 257779 A CA257779 A CA 257779A CA 1027667 A CA1027667 A CA 1027667A
Authority
CA
Canada
Prior art keywords
inverse time
overcurrent relay
linear approximations
successive linear
successive
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
CA257,779A
Other languages
English (en)
French (fr)
Inventor
Leonard C. Vercellotti
Shan C. Sun
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Application granted granted Critical
Publication of CA1027667A publication Critical patent/CA1027667A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/26—Arbitrary function generators
    • G06G7/28—Arbitrary function generators for synthesising functions by piecewise approximation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
    • H02H3/0935—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means the timing being determined by numerical means

Landscapes

  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
CA257,779A 1975-08-04 1976-07-26 Inverse time-overcurrent relay using successive linear approximations Expired CA1027667A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/601,898 US4017766A (en) 1975-08-04 1975-08-04 Inverse time-overcurrent relay using successive linear approximations

Publications (1)

Publication Number Publication Date
CA1027667A true CA1027667A (en) 1978-03-07

Family

ID=24409190

Family Applications (1)

Application Number Title Priority Date Filing Date
CA257,779A Expired CA1027667A (en) 1975-08-04 1976-07-26 Inverse time-overcurrent relay using successive linear approximations

Country Status (3)

Country Link
US (1) US4017766A (enExample)
JP (1) JPS5219239A (enExample)
CA (1) CA1027667A (enExample)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181134A (en) * 1977-09-21 1980-01-01 Mason Richard C Cardiotachometer
US4174496A (en) * 1978-08-02 1979-11-13 Rockwell International Corporation Monolithic solid state power controller
IN152852B (enExample) * 1978-08-09 1984-04-21 Gen Electric Co Ltd
US4219858A (en) * 1978-12-20 1980-08-26 General Electric Company Overcurrent relay apparatus
IT1126491B (it) * 1978-12-20 1986-05-21 Gen Electric Rele' di sovracorrente digitale
US4245318A (en) * 1979-05-07 1981-01-13 General Electric Company Circuit breaker demonstrator and distribution circuit protection coordinator apparatus
US4346424A (en) * 1980-02-22 1982-08-24 Eaton Corporation Electronic remote control D.C. power controller and circuit breaker
EP0047749A1 (en) * 1980-02-23 1982-03-24 George Ellison Limited Overcurrent protection devices
US4423458A (en) * 1982-04-05 1983-12-27 Siemens-Allis, Inc. Signal processing system for overload relay or the like
US4446498A (en) * 1982-04-05 1984-05-01 Siemens-Allis, Inc. Electronic control system for overload relay or the like
US4438476A (en) 1982-05-17 1984-03-20 General Electric Company Selectable integrating characteristic timer for protective relays
US4642724A (en) * 1982-06-22 1987-02-10 S&C Electric Company Trip signal generator for a circuit interrupter
US4571658A (en) * 1983-06-22 1986-02-18 S&C Electric Company Control circuit for a circuit interrupter
JPS61136827U (enExample) * 1985-02-14 1986-08-26
DE3522739A1 (de) * 1985-06-21 1987-01-02 Siemens Ag Verfahren zum erzeugen eines ausloesesignals in abhaengigkeit von der groesse und der dauer eines ueberstromes
US4916573A (en) * 1985-10-25 1990-04-10 S & C Electric Company Control circuit for a circuit interrupter
US4937757A (en) * 1988-10-11 1990-06-26 General Electric Company Digital circuit interrupter with selectable trip parameters
US5987393A (en) * 1997-02-20 1999-11-16 Abb Power T&D Company Inc. Method of configuring a microprocessor-based relay for use in overcurrent protection

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079533A (en) * 1961-07-17 1963-02-26 Gen Electric Protective relay
US3444434A (en) * 1967-03-06 1969-05-13 Ite Imperial Corp Static time-overcurrent relay
US3831061A (en) * 1972-12-18 1974-08-20 Allis Chalmers Overcurrent trip device

Also Published As

Publication number Publication date
JPS5538894B2 (enExample) 1980-10-07
JPS5219239A (en) 1977-02-14
US4017766A (en) 1977-04-12

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