GB742189A - Improvements in or relating to electric protective arrangements - Google Patents

Improvements in or relating to electric protective arrangements

Info

Publication number
GB742189A
GB742189A GB386253A GB386253A GB742189A GB 742189 A GB742189 A GB 742189A GB 386253 A GB386253 A GB 386253A GB 386253 A GB386253 A GB 386253A GB 742189 A GB742189 A GB 742189A
Authority
GB
United Kingdom
Prior art keywords
pilot
rectifier
current
pilot circuit
circuit
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
GB386253A
Inventor
Frederick Leslie Hamilton
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle and Co Ltd
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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Priority to GB386253A priority Critical patent/GB742189A/en
Publication of GB742189A publication Critical patent/GB742189A/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
    • H02H3/28—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
    • H02H3/307—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 involving comparison of quantities derived from a plurality of phases, e.g. homopolar quantities; using mixing transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Transformers (AREA)

Abstract

742.189. Protective cut-out arrangements. REYROLLE & CO., Ltd., A. Feb. 11. 1954 [Feb. 11, 1953], No. 3862/53. Class 38(5) In a protective arrangement of the balanced voltage type, the protective relay at each end of the pilot circuit is in the form of an impedance relay device of the mho type or of the offset mho type responsive to the relative magnitudes of the current and the voltage in the pilot circuit and to the phase angle between them. The relay device preferably operates in accordance with a comparison of two quantities, one of which is dependent on the current in the pilot circuit and the other on a vectorial combination of the pilot current and a current dependent on the pilot voltage. In Fig. 1, a rectifier comparator circuit comprises rectifiers J, J<SP>1</SP>, the input terminals of the rectifier J being connected in series in the pilot circuit and those of the rectifier J<SP>1</SP> to the output terminals of a mixing transformer H having a primary winding H' connected in series with the pilot circuit and a primary winding H<SP>2</SP> connected in series with a parallel connected resistance E. and capacitance E<SP>1</SP> across the pilot circuit. The rectifiers J, J<SP>1</SP> are so connected that. current circulates in their output circuit across which a polarized D.C. relay G is connected for response when the pilot current input through rectifier J is greater than the input through rectifier J<SP>1</SP> of the vectorial comparison of the pilot current and voltage made in the transformer H. The pilot circuit D, D<SP>1</SP> is supplied from current transformer B<SP>1</SP>...B<SP>3</SP> through a saturable summation transformer C, non-linear resistor C<SP>2</SP> and filter C<SP>3</SP>. In Fig. 2 (not shown) a diagram of the reactance-resistance characteristic indicates how the device would respond to internal but not to external fault conditions and reference is made to the setting of the device to compensate for the effect of pilot capacity. Comparison of the two quantities may be effected by means of a transductor having its operating winding or windings connected in series in the pilot circuit and its D.C. control winding supplied from the mixing transformer through a rectifier. Alternatively, by the use of two control windings R, R<SP>1</SP> and a smoothing winding P with a half-wave rectifier P<SP>1</SP>, the vectorial comparison and rectification are effected in the transductor. Secondary windings O, O<SP>1</SP> linked with the A.C. operating windings N. N<SP>1</SP> supply a D.C. relay Q through a rectifier Q<SP>2</SP>. Various other transductor arrangements are referred to.
GB386253A 1953-02-11 1953-02-11 Improvements in or relating to electric protective arrangements Expired GB742189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB386253A GB742189A (en) 1953-02-11 1953-02-11 Improvements in or relating to electric protective arrangements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB386253A GB742189A (en) 1953-02-11 1953-02-11 Improvements in or relating to electric protective arrangements

Publications (1)

Publication Number Publication Date
GB742189A true GB742189A (en) 1955-12-21

Family

ID=9766293

Family Applications (1)

Application Number Title Priority Date Filing Date
GB386253A Expired GB742189A (en) 1953-02-11 1953-02-11 Improvements in or relating to electric protective arrangements

Country Status (1)

Country Link
GB (1) GB742189A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121826A (en) * 1958-05-19 1964-02-18 Allen Bradley Co Phase failure protective circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121826A (en) * 1958-05-19 1964-02-18 Allen Bradley Co Phase failure protective circuit

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