US1787277A - Protective arrangement - Google Patents

Protective arrangement Download PDF

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Publication number
US1787277A
US1787277A US387523A US38752329A US1787277A US 1787277 A US1787277 A US 1787277A US 387523 A US387523 A US 387523A US 38752329 A US38752329 A US 38752329A US 1787277 A US1787277 A US 1787277A
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US
United States
Prior art keywords
circuit
restraining
controlling
relay
winding
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 - Lifetime
Application number
US387523A
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English (en)
Inventor
Luke F Kennedy
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
Original Assignee
General Electric Co
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 filed Critical General Electric Co
Priority to US387523A priority Critical patent/US1787277A/en
Priority to FR699766D priority patent/FR699766A/fr
Priority to GB25055/30A priority patent/GB355940A/en
Application granted granted Critical
Publication of US1787277A publication Critical patent/US1787277A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H02H7/04—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 for transformers
    • H02H7/045—Differential protection of transformers

Definitions

  • My invention relates to improvements'in protective arrangements for electric circuits, and more particularly forcircu-its including the windings of electric apparatus sub- -ject to transient magnetizing currents and an object of my invention is to provide an improved protective arrangement whereby to avoid unnecessary interruptions due to tr'an sient. magetizing currents and yet maintain the desired degree of sensitivity of protection under ordinary'steady state conditions.
  • FIG. 1 illustrates diagrammaticaly a protective arrangment embodying my invention
  • electricapparatus, 'subjectto transient magnetizing currents, such as apower transformer 5,- isarranged to have the'circult of its'primaryand secondary windings.
  • circuit interrupting means illustrated as a latch closed circuit breaker 8;having, a trip'coil 9.
  • the disk type and includes a movable member such' asthe disk'12 with which are inductively associated electromagnetic means, such as restraining and operating motor elements 13, 14, whose windings 15, 16 are respectively connected to' be energized in accordance with the sum of and the difference between the currents in'the windings 6 and 7 of the transformer 5.
  • electromagnetic means such as restraining and operating motor elements 13, 14, whose windings 15, 16 are respectively connected to' be energized in accordance with the sum of and the difference between the currents in'the windings 6 and 7 of the transformer 5.
  • straining winding 15 may be connected in series in a protective circuit includng the secondaries of current; transformers 17 and 18 connected in series for normally circulating current while the operating winding 16 is connected across points 19 and 20 in' As shown,-the relay '10 is of the induction PHILADELPHIA, PENNSYLVANIA, Assrdnon T0.
  • GENERAL 2 illustrates diagrammatically a modification In order to avoid this this circuit normally at the same potential, the current transformers 17 and 18 being connected in the circuits of the power transformer windings 6 and 7 respectively.
  • the motoring elements 18, 14 are arranged to ex ert on the disk 12 opposing torques whose respective directions are indicated by the arrows 3, 4.
  • the ratio of these torques may of course be any desired value which can be governed, for example, by the relative number of turns in the windings 15 and 16.
  • I provide an additional restraint which is effective during the transient magnetizing current perod. As shown in Fig. 1 this may be ac complished by providing a circuit tuned to a harmonic of the magnetizing current such for example as the second harmonic.
  • a condenser 21 may be connected across a part, such as a half. of the restraining winding 15 and tuned therewith to form a parallel resonant circuit for such harmonic. If the power transformer 5 is subject to energization from eitherside then a further resonant circuit including the condenser 22 and the other half of the restraining winding 15 may be provided. 7
  • I may provide the relay 10, as shown in Fig. 2, with two independent electromagnetic restraining elements 23, 24, having windings 25, 26 arranged in series resonantcircuits tuned to the second harmonic of the transient magnetizing current.
  • these circuits include the condensers 27, 28, and are connected across the secondaries of the current transformers 17, 18, respectively.
  • These restraining elements may operate for example on a second disk12 secured to the same shaft as the disk 12 on which the main restraining and operating elements 13 and 14: operate.
  • means for controlling said interrupter including a relay having a restraining winding circuit tuned to a predetermined harmonic of the transient magnetizing current of said.
  • means including a relay for controlling said interrupter, means for restraining the operation of said relay connected to be energized only in accordance with a predetermined harmonic of the transient magnetizing current of said apparatus.
  • means for controlling said interrupter including a relay having a movable member, operating and restraining means for controlling the movement thereof and means for additionally restraining the movement of said member only in accordance with a predetermined harmonic of the transient magnetizing current of said apparatus.
  • a power transformer controlling the circuit thereof, means for controlling said interrupter including a differential relay having a movable member, restraining and op erating means for controlling the movement thereof respectively connected to be energized in accordance with the sum of and the difference between the currents in the primary and secondary windings of said transformer and means for additionally restraining the movement of said member including a restraining winding circuit tuned to the second harmonic of the ⁇ transient magnetizing current of the transformer;
  • a circuit interrupter for controllin the circuit thereof, meansfor controlling sai interrupter including'a relay having a movable induction disk means, electromagnetic means inductivelyassociated with said disk means" and arranged 'toexert opposing torques thereon, and means for increasing the effect of one of said torques only in response to the second harmonic of the transient mag netizing current of the transformer.
  • means for controlling said interrupter including a relay having restraining and operating elements re spectlvely connected tobe energized in accordance with the sum of and the difference 7 between the currents in the primary and secondary windings of the transformer [and means for exerting an additional restraining effect connected to be energized in accordance with a predetermined harmonic of the transient magnetizing current of the transformer.
  • means for controlling said interrupter including a relay having restraining and operatingwindings respectively connected to be energized in accordance with the sum of and the difierence between the currents in the primary and secondary windings of the transformer and means for exerting an additional restraining effect connected to be energized in accordance with the second harmonic of the transient magnetizing current of the transformer.
  • means for controlling said interrupter including a relay and means responsive to a' characteristic of the transient magnetizing current otherthan the fundamental thereof for preventing operation of the relay.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Protection Of Transformers (AREA)
US387523A 1929-08-21 1929-08-21 Protective arrangement Expired - Lifetime US1787277A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US387523A US1787277A (en) 1929-08-21 1929-08-21 Protective arrangement
FR699766D FR699766A (fr) 1929-08-21 1930-07-31 Perfectionnements aux systèmes de protection pour circuits électriques
GB25055/30A GB355940A (enrdf_load_stackoverflow) 1929-08-21 1930-08-21

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US355940XA 1929-08-21 1929-08-21
US699766XA 1929-08-21 1929-08-21
US387523A US1787277A (en) 1929-08-21 1929-08-21 Protective arrangement

Publications (1)

Publication Number Publication Date
US1787277A true US1787277A (en) 1930-12-30

Family

ID=50572362

Family Applications (1)

Application Number Title Priority Date Filing Date
US387523A Expired - Lifetime US1787277A (en) 1929-08-21 1929-08-21 Protective arrangement

Country Status (3)

Country Link
US (1) US1787277A (enrdf_load_stackoverflow)
FR (1) FR699766A (enrdf_load_stackoverflow)
GB (1) GB355940A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422309A (en) * 1945-03-10 1947-06-17 Automatic Elect Lab Distortion correcting impulse repeater
US2422288A (en) * 1944-06-02 1947-06-17 Western Electric Co Apparatus for testing electrical insulation
US2528240A (en) * 1949-12-10 1950-10-31 Gen Electric Transformer differential relay
US2574403A (en) * 1948-04-19 1951-11-06 Gen Electric Differential protective system
US2683242A (en) * 1949-02-16 1954-07-06 Jefferson Electric Co Control device and lighting system
US2896127A (en) * 1956-06-26 1959-07-21 Gen Electric Temperature responsive protective relay

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744096C (de) * 1939-12-20 1944-01-08 Aeg Einrichtung zur Verhinderung von Fehlausloesungen von Schutzeinrichtungen beim Einschalten induktiver Anlageteile
DE744451C (de) * 1940-06-06 1944-01-15 Aeg Differentialschutzeinrichtung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422288A (en) * 1944-06-02 1947-06-17 Western Electric Co Apparatus for testing electrical insulation
US2422309A (en) * 1945-03-10 1947-06-17 Automatic Elect Lab Distortion correcting impulse repeater
US2574403A (en) * 1948-04-19 1951-11-06 Gen Electric Differential protective system
US2683242A (en) * 1949-02-16 1954-07-06 Jefferson Electric Co Control device and lighting system
US2528240A (en) * 1949-12-10 1950-10-31 Gen Electric Transformer differential relay
US2896127A (en) * 1956-06-26 1959-07-21 Gen Electric Temperature responsive protective relay

Also Published As

Publication number Publication date
GB355940A (enrdf_load_stackoverflow) 1931-09-03
FR699766A (fr) 1931-02-19

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