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GB1501351A - Protective relaying system - Google Patents

Protective relaying system

Info

Publication number
GB1501351A
GB1501351A GB1231/76A GB123176A GB1501351A GB 1501351 A GB1501351 A GB 1501351A GB 1231/76 A GB1231/76 A GB 1231/76A GB 123176 A GB123176 A GB 123176A GB 1501351 A GB1501351 A GB 1501351A
Authority
GB
United Kingdom
Prior art keywords
gates
counter
sequence
decoder
decoding
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
GB1231/76A
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
Publication of GB1501351A publication Critical patent/GB1501351A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Compounds Of Unknown Constitution (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

1501351 Selective signalling WESTINGHOUSE ELECTRIC CORP 13 Jan 1976 [7 Feb 1975] 1231/76 Heading G4H [Also in Division H2] So long as conditions at the far end of a polyphase line are normal, a reference signal comprising a particular sequence of bits is sent repetitively to the near end via a single transmission link, but when a fault is sensed the reference signal is suppressed and instead signals representing operating conditions at the far end are transmitted using time-division multiplex techniques. At the near end, reception of the reference signal is used to inhibit the T.D.M. decoder but at the same time keep it synchronized with the coder at the other end. As soon as the receiver recognizes that the reference signal is no longer being received, however, the decoder is rendered operative and a blocking signal is removed from a protective system. The transmitter/coder at the far end (Fig. 3) comprises a counter 148 driven by a clock 144 to provide signals on each of its six outputs in sequence. Under normal conditions these outputs enable AND gates 124-129 to turn to that reference sequence of bits 111000 is repetitively transmitted via gates 131, 139. Under fault conditions, however, gate 120 provides an output which inhibits the AND gates 124-129 and instead removes blocking signals from three further AND gates 133-135. The counter 148 now enables these three gates in sequence so that measuring signals on lines 28-30 are time division multiplexed and transmitted. The receiver/decoder (Fig. 4) comprises a shift register 160 coupled to a set of six gates 178-183 which together recognize whether what is in the shift register is the reference sequence 111000 or a "shifted" version thereof. The decoder proper comprises a counter 176 driven by a synchronized receiver clock 166 and enabling decoding gates 162-164 in sequence. So long as the reference sequence is being received the output of gate 186 blocks the decoding gates, but a counter 189 resynchronizes the decoding counter 176 at regular intervals, being itself resynchronized by a further counter 174. When the reference sequence is not being received the decoding gates 162-164 are enabled and provide demultiplexed outputs via flip-flops 196-198.
GB1231/76A 1975-02-07 1976-01-13 Protective relaying system Expired GB1501351A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US54813275A 1975-02-07 1975-02-07

Publications (1)

Publication Number Publication Date
GB1501351A true GB1501351A (en) 1978-02-15

Family

ID=24187555

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1231/76A Expired GB1501351A (en) 1975-02-07 1976-01-13 Protective relaying system

Country Status (11)

Country Link
JP (1) JPS51103242A (en)
AR (1) AR212018A1 (en)
AU (1) AU503606B2 (en)
BR (1) BR7600683A (en)
DE (1) DE2604313A1 (en)
ES (1) ES444972A1 (en)
FR (1) FR2300449A1 (en)
GB (1) GB1501351A (en)
IN (1) IN145194B (en)
IT (1) IT1056690B (en)
SE (1) SE404109B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241336A (en) 1977-11-14 1980-12-23 Multilin Inc. Method and apparatus for monitoring poly-phase currents in poly-phase equipment
GB2135486A (en) * 1983-02-18 1984-08-30 Png Prod Ltd Methods of remote-control using T.D.M. systems and apparatus utilising said methods
GB2229560A (en) * 1988-12-06 1990-09-26 Gen Electric A status and control multiplex communications system
US7714735B2 (en) 2005-09-13 2010-05-11 Daniel Rockwell Monitoring electrical assets for fault and efficiency correction
US9562925B2 (en) 2012-02-14 2017-02-07 Tollgrade Communications, Inc. Power line management system
US9647454B2 (en) 2011-08-31 2017-05-09 Aclara Technologies Llc Methods and apparatus for determining conditions of power lines
US9972989B2 (en) 2014-03-31 2018-05-15 Aclara Technologies Llc Optical voltage sensing for underground medium voltage wires
US10203355B2 (en) 2014-08-29 2019-02-12 Aclara Technologies Llc Power extraction for a medium voltage sensor using a capacitive voltage divider

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3390233A (en) * 1965-01-08 1968-06-25 Sangamo Electric Co Digital unambiguous control of circuit interrupter means
US3696210A (en) * 1970-08-06 1972-10-03 Motorola Inc Data transferring system utilizing a monitor channel and logic circuitry to assure secure data communication
US3893008A (en) * 1972-10-04 1975-07-01 Westinghouse Electric Corp Segregated phase comparison relaying apparatus
US3832601A (en) * 1973-08-09 1974-08-27 Westinghouse Electric Corp Phase comparison relaying apparatus with two-count by-pass circuit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4241336A (en) 1977-11-14 1980-12-23 Multilin Inc. Method and apparatus for monitoring poly-phase currents in poly-phase equipment
GB2135486A (en) * 1983-02-18 1984-08-30 Png Prod Ltd Methods of remote-control using T.D.M. systems and apparatus utilising said methods
GB2229560A (en) * 1988-12-06 1990-09-26 Gen Electric A status and control multiplex communications system
US7714735B2 (en) 2005-09-13 2010-05-11 Daniel Rockwell Monitoring electrical assets for fault and efficiency correction
US8587445B2 (en) 2006-09-13 2013-11-19 Daniel J. Rockwell Monitoring electrical assets for fault and efficiency correction
US9647454B2 (en) 2011-08-31 2017-05-09 Aclara Technologies Llc Methods and apparatus for determining conditions of power lines
US12249829B2 (en) 2011-08-31 2025-03-11 Aclara Technologies Llc Methods and apparatus for determining conditions of power lines
US9562925B2 (en) 2012-02-14 2017-02-07 Tollgrade Communications, Inc. Power line management system
US10041968B2 (en) 2012-02-14 2018-08-07 Aclara Technologies Llc Power line management system
US9972989B2 (en) 2014-03-31 2018-05-15 Aclara Technologies Llc Optical voltage sensing for underground medium voltage wires
US10203355B2 (en) 2014-08-29 2019-02-12 Aclara Technologies Llc Power extraction for a medium voltage sensor using a capacitive voltage divider

Also Published As

Publication number Publication date
FR2300449A1 (en) 1976-09-03
DE2604313A1 (en) 1976-08-19
FR2300449B1 (en) 1982-04-02
ES444972A1 (en) 1977-05-01
AU503606B2 (en) 1979-09-13
SE7601298L (en) 1976-08-09
BR7600683A (en) 1976-08-31
AU1053276A (en) 1977-07-28
SE404109B (en) 1978-09-18
IN145194B (en) 1978-09-09
IT1056690B (en) 1982-02-20
AR212018A1 (en) 1978-04-28
JPS51103242A (en) 1976-09-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee