ZA868782B - Direct transfer trip apparatus for use with an active pilot wire communications channel - Google Patents

Direct transfer trip apparatus for use with an active pilot wire communications channel

Info

Publication number
ZA868782B
ZA868782B ZA868782A ZA868782A ZA868782B ZA 868782 B ZA868782 B ZA 868782B ZA 868782 A ZA868782 A ZA 868782A ZA 868782 A ZA868782 A ZA 868782A ZA 868782 B ZA868782 B ZA 868782B
Authority
ZA
South Africa
Prior art keywords
communications channel
direct transfer
pilot wire
wire communications
active pilot
Prior art date
Application number
ZA868782A
Other languages
English (en)
Inventor
Russell Woodbury Gonnam
Shan Chyi Sun
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
Publication of ZA868782B publication Critical patent/ZA868782B/xx

Links

Classifications

    • 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
    • H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/28—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
    • H02H3/30—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
    • 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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
ZA868782A 1985-12-13 1986-11-19 Direct transfer trip apparatus for use with an active pilot wire communications channel ZA868782B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/808,768 US4675774A (en) 1985-12-13 1985-12-13 Direct transfer trip apparatus for use with an active pilot wire communications channel

Publications (1)

Publication Number Publication Date
ZA868782B true ZA868782B (en) 1987-07-29

Family

ID=25199678

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA868782A ZA868782B (en) 1985-12-13 1986-11-19 Direct transfer trip apparatus for use with an active pilot wire communications channel

Country Status (7)

Country Link
US (1) US4675774A (pt)
JP (1) JPS62141919A (pt)
KR (1) KR940009204B1 (pt)
CN (1) CN1007308B (pt)
BR (1) BR8606134A (pt)
CA (1) CA1269165A (pt)
ZA (1) ZA868782B (pt)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939617A (en) * 1989-05-05 1990-07-03 Dowty Rfl Industries Inc. Method and apparatus for monitoring an AC transmission line
US5592354A (en) * 1991-03-19 1997-01-07 Nocentino, Jr.; Albert Audio bandwidth interface apparatus for pilot wire relays
US5426554A (en) * 1991-03-19 1995-06-20 Albert Nocentino, Jr. Audio bandwidth interface apparatus for pilot wire relays
US5267231A (en) * 1991-07-03 1993-11-30 Abb Power T&D Company Inc. Digital communication channel interface
US8503374B2 (en) * 2007-08-02 2013-08-06 Qualcomm Incorporated Method for scheduling orthogonally over multiple hops
US9699688B2 (en) 2007-08-02 2017-07-04 Qualcomm Incorporated Method for scheduling orthogonally over multiple hops

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408246A (en) * 1982-01-13 1983-10-04 Westinghouse Electric Corp. Protective relay apparatus
US4464697A (en) * 1982-07-13 1984-08-07 Westinghouse Electric Corp. Protective relay system
US4513340A (en) * 1982-12-13 1985-04-23 The Montana Power Company Power transmission line protective apparatus
US4538195A (en) * 1984-02-22 1985-08-27 Westinghouse Electric Corp. Three terminal current differential protective relay

Also Published As

Publication number Publication date
KR870006607A (ko) 1987-07-13
CN1007308B (zh) 1990-03-21
KR940009204B1 (ko) 1994-10-01
CA1269165A (en) 1990-05-15
JPS62141919A (ja) 1987-06-25
BR8606134A (pt) 1987-09-22
CN86108478A (zh) 1987-07-22
US4675774A (en) 1987-06-23

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