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Publication numberUS3731152 A
Publication typeGrant
Publication dateMay 1, 1973
Filing dateMay 25, 1972
Priority dateMay 25, 1972
Publication numberUS 3731152 A, US 3731152A, US-A-3731152, US3731152 A, US3731152A
InventorsPlains M, Rockefeller G
Original AssigneeWestinghouse Electric Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Impedance distance relay
US 3731152 A
Abstract
An apparatus for determining the peak value of the sinusoidal component of an electrical quantity which may include a non-sinusoidal component by means of comparing the first and second differential magnitudes of the electrical quantity at any time interval of the period of the sinusoidal component whereby the value of any low rate of change component is attenuated, as for example the D.C. offset which is normally present during fault conditions. The apparatus also includes means to determine the phase angles between two sinusoidal components and when such two sinusoidal components represent current and voltage to determine the magnitude of the impedance of the network energized by said sinusoidal quantities.
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Claims  available in
Description  (OCR text may contain errors)

{22 Filed: [211 Appl. No.: 256,668

' Unitedi StateS-Patent "1191f Rockefeller, Jr. I I I I [54] IMPEDANCE DISTANCE RELAY [75] Inventor: George D; Rockefeller, Jr., Morris Plains, NJ

l [73] Assignee: Westinghouse Electric Corporation,

Pittsburgh, Pa.

7 May 25,1972

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VOLTAGE 4 1972 Traversi....; ..'....317 27 R 1451 May'l, 197s Primary ExaminerJames D. Trammell AttorneyA. T. Stratton et al.

57 ABSTRACT mine the magnitude of the impedance of the network energized by said sinusoidal quantities.

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Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3569785 *Jul 9, 1968Mar 9, 1971IbmPower system protective relaying by time-coordinated sampling and calculation
US3654516 *Apr 7, 1971Apr 4, 1972Westinghouse Electric CorpChange of current or voltage acutated protecting relay
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3885199 *Jul 2, 1973May 20, 1975Hitachi LtdProtective relaying device
US3904859 *Sep 24, 1973Sep 9, 1975Siemens AgMethod and apparatus for measuring the impedance of a line
US3984737 *Dec 6, 1974Oct 5, 1976Hitachi, Ltd.Protective relaying system
US4079434 *Jul 23, 1976Mar 14, 1978Westinghouse Electric CorporationOut-of-step relay
US4107778 *Feb 15, 1977Aug 15, 1978Hitachi, Ltd.Digital fault-location calculation system
US4148087 *Apr 20, 1977Apr 3, 1979Phadke Arun GDistance relay for electric power transmission lines
US4212046 *May 9, 1978Jul 8, 1980Tokyo Shibaura Denki Kabushiki KaishaDistance relaying systems
US4219858 *Dec 20, 1978Aug 26, 1980General Electric CompanyOvercurrent relay apparatus
US4237511 *Oct 23, 1978Dec 2, 1980Bbc Brown, Boveri & Co LtdSelective protection process for electrical lines and device for carrying out the process
US4287547 *Aug 15, 1979Sep 1, 1981Bbc Brown, Boveri & Co. Ltd.Method and apparatus for fault and/or fault direction detection
US4321681 *Sep 21, 1979Mar 23, 1982Westinghouse Electric Corp.Protective relay apparatus
US4377833 *Aug 17, 1981Mar 22, 1983Electric Power Research Institute, Inc.Methods and apparatus for protecting electrical reactors
US4395671 *Jan 4, 1982Jul 26, 1983Emhart Industries, Inc.Control system and method for motor starting
US4455612 *Jan 27, 1982Jun 19, 1984Iowa State University Research Foundation, Inc.Recursive estimation in digital distance relaying system
US4625283 *May 7, 1982Nov 25, 1986Cooper Industries, Inc.Method and apparatus for digitally measuring alternating current
US4803635 *Nov 6, 1986Feb 7, 1989Kabushi Kaisha ToshibaInformation data output device for electric-power systems
US5307061 *Sep 21, 1992Apr 26, 1994Nec CorporationAbsolute value circuit
US6137666 *Jan 21, 1999Oct 24, 2000Abb Power T&D Company Inc.High speed, selective protective relays
US6879917Jun 13, 2003Apr 12, 2005Progress Energy Carolinas Inc.Double-ended distance-to-fault location system using time-synchronized positive-or negative-sequence quantities
US7423964 *Nov 18, 2004Sep 9, 2008International Business Machines CorporationApparatus and method to set the signaling rate of a network disposed within an information storage and retrieval system
US7974189Aug 21, 2008Jul 5, 2011International Business Machines CorporationApparatus and method to set the signaling rate of a network disposed within an information storage and retrieval system
US8045307 *Oct 12, 2007Oct 25, 2011Abb Technology AgFaulted phase decision method between current and voltage based delta phase selectors
EP0224089A1 *Nov 6, 1986Jun 3, 1987Kabushiki Kaisha ToshibaInformation data output device for electric-power systems
Classifications
U.S. Classification361/80, 702/58
International ClassificationH02H3/40, H02H3/38
Cooperative ClassificationH02H3/382, H02H3/40
European ClassificationH02H3/40, H02H3/38B
Legal Events
DateCodeEventDescription
Jun 7, 1990ASAssignment
Owner name: ABB POWER T&D COMPANY, INC., A DE CORP., PENNSYLV
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.;REEL/FRAME:005368/0692
Effective date: 19891229