GB1006438A - Distance protection means for directly earthed networks - Google Patents

Distance protection means for directly earthed networks

Info

Publication number
GB1006438A
GB1006438A GB2641762A GB2641762A GB1006438A GB 1006438 A GB1006438 A GB 1006438A GB 2641762 A GB2641762 A GB 2641762A GB 2641762 A GB2641762 A GB 2641762A GB 1006438 A GB1006438 A GB 1006438A
Authority
GB
United Kingdom
Prior art keywords
shaper
phase
voltage
units
energized
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
GB2641762A
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
Allmanna Svenska Elektriska AB
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 ASEA AB, Allmanna Svenska Elektriska AB filed Critical ASEA AB
Publication of GB1006438A publication Critical patent/GB1006438A/en
Expired legal-status Critical Current

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
    • H02H3/38—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 both voltage and current; responsive to phase angle between voltage and current
    • H02H3/382—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 both voltage and current; responsive to phase angle between voltage and current involving phase comparison between current and voltage or between values derived from current and voltage
    • 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
    • H02H3/265—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 responsive to phase angle between voltages or between currents

Landscapes

  • Ac-Ac Conversion (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1,006,438. Protective systems. ALLMANNA SVENSKA ELEKTRISKA A.B. July 10, 1962 [July 11, 1961], No. 26417/62. Heading H2K. A distance protective arrangement for a three-phase system with a directly earthed neutral, comprises four directional units, one responsive to two-phase short circuits and the other three being responsive to single-phase and three-phase faults. The first unit comprises square-wave shapers 4, 5 connected to replica impedances 1, 2, 3 so that each shaper is energized by a voltage derived from a line voltage and a voltage dependent on the vector difference between the corresponding line currents. The output of the shaper 4 is differentiated at 7 and the resulting short pulses are supplied to a gate 8 together with the square waves from the shaper 5, a tripping relay 9 being energized when the pulses have the same polarity as the square waves. The three remaining directional units each comprise a square-wave shaper 14, 15 or 16, each supplied via one of the replica impedances 1, 2 or 3 with a voltage dependent on a phase voltage, the corresponding line current and the zero sequence current. Each of these units also comprises a further squarewave shaper 18, 19 or 20 energized by a voltage derived from that positive sequence line voltage which has a phase angle of 90 degrees relative to the particular phase voltage applied to the other shaper of the unit. The outputs of the shapers 14 . . . 16 and 18 . . . 20 are applied to differentiating units 21 . . . 23 and gates 24 . . . 26 to effect the energization of the relay 9 as in the case of the first directional unit. Fig. 2 shows a four zone system comprising four of the arrangements as in Fig. 1, but using a common sequence filter 17 and common squarers 18 . . . 20. The arrangement having the longest reach may act as a starting unit controlling the energization of a timing element.
GB2641762A 1961-07-11 1962-07-10 Distance protection means for directly earthed networks Expired GB1006438A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE718561 1961-07-11

Publications (1)

Publication Number Publication Date
GB1006438A true GB1006438A (en) 1965-09-29

Family

ID=20270653

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2641762A Expired GB1006438A (en) 1961-07-11 1962-07-10 Distance protection means for directly earthed networks

Country Status (3)

Country Link
CH (1) CH395268A (en)
DE (1) DE1151061B (en)
GB (1) GB1006438A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011083312A1 (en) 2010-01-08 2011-07-14 Oxford Gene Technology (Operations) Ltd Combined cgh & allele-specific hybridisation method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011083312A1 (en) 2010-01-08 2011-07-14 Oxford Gene Technology (Operations) Ltd Combined cgh & allele-specific hybridisation method

Also Published As

Publication number Publication date
DE1151061B (en) 1963-07-04
CH395268A (en) 1965-07-15

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