GB630557A - Improvements in and relating to three-phase feeder protective systems - Google Patents

Improvements in and relating to three-phase feeder protective systems

Info

Publication number
GB630557A
GB630557A GB103046A GB103046A GB630557A GB 630557 A GB630557 A GB 630557A GB 103046 A GB103046 A GB 103046A GB 103046 A GB103046 A GB 103046A GB 630557 A GB630557 A GB 630557A
Authority
GB
United Kingdom
Prior art keywords
winding
reactor
relay
current
neutral
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
GB103046A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB103046A priority Critical patent/GB630557A/en
Publication of GB630557A publication Critical patent/GB630557A/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
    • H02H3/26—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
    • H02H3/32—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
    • H02H3/343—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using phase sequence analysers

Landscapes

  • Protection Of Transformers (AREA)

Abstract

630,557. Protective cut out systems. GENERAL ELECTRIC CO., Ltd., and FRIEDLANDER, E. Jan. 11, 1946, No. 1030. [Class 38(v)] A protective system for a three-phase feeder gives protection against interphase, earth and over-current faults by using a filter circuit which produces a single-phase current, the magnitude and phase of which is dependent upon the magnitude of the positive sequence components of the feeder currents, with the addition of a larger zero sequence component to increase the sensitivity of the circuit to earth faults. One filter circuit may be used to operate a relay to give local protection. In a differential protective arrangement a suitable relay may be connected between two spaced filter circuits by means of two pilot wires or by radio link. In Fig. 3, the secondary windings TR, TY, TB, of three current transformers are connected at one end to form a neutral and windings TR, TB, are connected at their other ends to a reactor X, whilst. the other end of winding TY is connected to a resistor R1, which in turn is connected to a central tapping point on the reactor X. A relay Z connected between the ends of the windings TR, TY, is energized by a current dependent on the positive sequence components derived from the circuit so far described. The provision of a further winding X<SP>1</SP> on the core of the reactor and connected between the reactor and the neutral point of the current transformers introduces the larger zero sequence component into the relay coil Z. In Fig. 2 (not shown), a further current transformer used in the place of the winding X<SP>1</SP> has its primary winding connected between the neutral point and the centre tapping of the reactor, its secondary winding being connected across the relay Z. In a further modification, Fig. 1 (not shown), a resistance, replacing the winding X<SP>1</SP>, is connected between the neutral point and the end of the resistance R1, the relay coil being connected between the neutral and winding TR.
GB103046A 1946-01-11 1946-01-11 Improvements in and relating to three-phase feeder protective systems Expired GB630557A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB103046A GB630557A (en) 1946-01-11 1946-01-11 Improvements in and relating to three-phase feeder protective systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB103046A GB630557A (en) 1946-01-11 1946-01-11 Improvements in and relating to three-phase feeder protective systems

Publications (1)

Publication Number Publication Date
GB630557A true GB630557A (en) 1949-10-17

Family

ID=9714919

Family Applications (1)

Application Number Title Priority Date Filing Date
GB103046A Expired GB630557A (en) 1946-01-11 1946-01-11 Improvements in and relating to three-phase feeder protective systems

Country Status (1)

Country Link
GB (1) GB630557A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110556783A (en) * 2019-09-10 2019-12-10 许昌许继软件技术有限公司 zero sequence overcurrent protection method and device for transformer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110556783A (en) * 2019-09-10 2019-12-10 许昌许继软件技术有限公司 zero sequence overcurrent protection method and device for transformer

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