US1706124A - Circuit controller - Google Patents

Circuit controller Download PDF

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Publication number
US1706124A
US1706124A US24436A US2443625A US1706124A US 1706124 A US1706124 A US 1706124A US 24436 A US24436 A US 24436A US 2443625 A US2443625 A US 2443625A US 1706124 A US1706124 A US 1706124A
Authority
US
United States
Prior art keywords
circuit
shunt
current
interrupter
generators
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
US24436A
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English (en)
Inventor
Jacob W Mcnairy
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 US24436A priority Critical patent/US1706124A/en
Priority to FR605485D priority patent/FR605485A/fr
Priority to FR31818D priority patent/FR31818E/fr
Priority to GB10385/26A priority patent/GB250986A/en
Priority to DEA47580D priority patent/DE477692C/de
Application granted granted Critical
Publication of US1706124A publication Critical patent/US1706124A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7463—Adjusting only the electromagnetic mechanism
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H2071/749—Means for adjusting the conditions under which the device will function to provide protection with a shunt element connected in parallel to magnetic or thermal trip elements, e.g. for adjusting trip current

Definitions

  • This invention relates to electro-respon- .sive circuit controlling devices and more particularly to automatic circuit interrupters which are provided with current responsive 5 operating means arranged to operate quickly in response toeither steady or transient predetermined cur'rent conditions.
  • the object ofthe invention is to provide means for changing the calibration of anelectro-re sponsive circuit controlling device of the above character.
  • the change in calibration of the electro-responsive device is accomplished in accordance with my invention by means of an inductive shunt which is permanently connected to the terminals of the currentresponsive means which controls the operation of the circuit controlling device and which is provided with connections intermediate its ends for varying the division of the current between the means and theshunt and thereby varying both the steady and the transient value of currents requiredto efifect operation of the device.
  • the invention is particularly advantageous when employed to calibrate a high speed automatic circuit interrupter of the "type described and claimed in the Tritle Reissue Pet cut No. 15,441-datedAugust 29, 1 922.
  • the Tritle type of high speed circuit interrupter is strongly biased'to the open position'and is held closed electromagnetically.
  • Current responsive means such as'a winding or bucking bar energized responsively'to the current in the control circuit is arranged to quickly shift the flux of the holding electr'omagnet for cf fecting the opening of the interrupter upon the occurrence of overload conditions inthe Ordinarily or bucking bar of this type of circuit interrupter is connected in parallel circuit with a shunt having relativel large inductance.
  • Fig. 1 of the accompanying drawing diagrammatically illustrates the invention embodied in a-protective system for a circuit supplied by a plurality of generators employ.- ing ahigh speed circuit interrupter of .the previously mentioned Tritle type.
  • Fig. 2 of the drawing is an enlarged perspective view of the inductive shunt and bucking bar arrangement of the interrupter shown'in Fig. 1.
  • 'supply line 10 is arranged to receive power from any one or all of the generators 11, 12, 13 and 14, through the respective disconnecting switches 15, 16, 17 and18 and the overload circuit'breakers 19, 20, 21 and 22, which may be of any desired typel
  • the high speed circuit interrupter 23 is arranged to control. a short circuit around the current limiting resister 24 which is inserted in the groundconnection of the generators-11,12, 13 and 14; v
  • the interrupter 23 as. shownis of the high speed trip freetype described and claimed in the Patent No. 1,560,440, issued Nov. 3, 192.5,
  • the degree of energization of the windingor bucking bar 31 upon both steady and transient overload current conditions is controlled by means of the inductive shunt 32 which, as more clearly shown in Fig. 2, is permanently connected across terminals of the windor huclring bar and is provided with a plurality of connections 3 L. and intermediate its ends for connecting different portions of the shunt in series circuit relation with the bucking bar and thereby varying the division of current between the remaining portion of the shunt and the bucking bar 31.
  • connections correspond in number to the number of generators supplying power to the circuit control interrupter and are under the contrpl of a suitable switch 37 which may be operated to make the proper connection to the shunt 32 depending upon the number of generators supplying power to the control circuit.
  • a. well known form of inductive shunt comprising a bar 37 of copper or other suitable conducting material which is encircled by a plurality of iron washers '38, preferably located in groups on each side of the connections 35 and 36 as indicated in the drawing.
  • the bar 37 is permanently connected at both of its ends to the terminals ,of the bucking bar 31 and is secured thereto by the bolts 39 and 40. While not shown in the drawing, suitable spacers may be provided for maintaining the groups of washers in proper spaced relation and the washers also may be slotted or otherwilse suitpower circuit through the connection of y the shunt 32. Under these conditions, the circuit interrupter 23 is operated to the closed position upon closure of the normally opened push button 38. This energizes the electromagnet closing mechanism 27 with which the breaker is provided and the resulting operation thereof serves to move the circuit controlling member 25 to the closed position wherein it is electromagnetically held by the holding elcctromagnet 28. the magnetizing winding 29 being normally energized from the supply line 10 or other suitable sources.
  • the automatic operatin of t interrupter to the open position e occurrence of steady or graduall increasing overload in the controlled circuit depends upon the relative ohmic resistance of the bucking bar 31 and the shunt 32 while the operation of the interrupter 23 responsively to transient or rapidly increasing overload currents in the control circuit also depends upon the relative inductance of the bucking bar 31 and the shunt 32.
  • the arrangement is such-that both the maximum ohmic resistance of the shunt and the maximum inductance of the shunt cause the power current to be divided between the bucking bar 31 and the shunt 32 with the maximum proportion of the current passing through the bucking bar 31 under both steady and transient overload current conditions in the control circuit.
  • this arrangement causes the interrupter 23 to open upon the occurrence of a steady current in the supply circuit of a value beyond the safe operating limits of the generator 11 while the operation ppon the occurrence of transient or rapidly increasing overload current occurs at a somewhat lower value such as for example 50% oi the steady overload current. If, now, the disconnecting switch 16 and the circuit breaker 20 are closed to enable the generator 12 to supply current to the supply line 10, the switch 37 is advanced to its second operating position in which the power circuit is established through the connection 34 of the shunt 32 in order to obtain the proper calibration of the interrupter 23.
  • the relative ohmic resistance of the shunt 32 to the bucking bar 31 is decreased although the relative inductance of'the shunt IUD and the bucking bar are substantially the same.
  • the operation of the circuit interrupter to the open position occurs at a higher value of steady or gradually increasing overload current in the control circuit while the relative value of the transient or rapidly increasing overload current required for operation of the breaker remains substantially the same, namely Should the service conditions require a greater current in the supply line 10, the generator 13 may be connected thereto by closure of disconnecting switch 1? and the overload circuit breaker 21.
  • the switch 37 is moved into its operative position in which the power circuit is completed through the connection 35 of the shunt 32.
  • the bucking bar 31 and the shunt 32 are connected in the control circuit with one portion of the shunt in series with the bucking bar 31 and another portion of the shunt 32 in parallel circuit with the bucking bar 31 and the first section of the shunt 32.
  • the esulting division of current between the shunt 32 and the bucking bar 31 is such that upon steady or gradually increasing overloads the valueof current required for the operation of the interrupter 23 is further increased while the relative value of the transientor rapidly increasing overload, current is increased. This is due to the fact that the section of the shunt 32 which is connected in parallel circuit withthe bucking bar 31 is of less inductance than when the power cir-. cuit is'conipleted through the connections 33 or 34.
  • switch 3'? is operated to complete the power circuit through the connection 36 ofthe shunt 32.
  • the section of the shunt 32 connected in parallel with the circuit including the bucking, bar 31 is of minimum ohmic resistance as well as of minimum inductance.
  • the circuit interrupter 23 may be initiall calibrated by means of the electromagnetic plugs 39 and v40 which control the value of .the flux in the magnetic circuit of the holding electromagnet, 28, or by suitable means for varying the energizing current of the hold-. ing winding 29 to adapt the interrupter for operation at the proper values of both steady and rapidly increasing overload currents corresponding to the operating capacities of the individual generators supplying power to the controlled circuit.
  • "by varying the value of the flux in the holding electromagnet 28 the value of the current in the bucking bar 31 required to eflect release of the circuit controlling-member 35 under both steady and rapidly increasing overload currents may be either increased or decreased.
  • the subsequent calibration of the interrupter 23 for operation with different numbers of generators connectedto supply power to the controlled circuit may be edected entirely by operation of the switch 37 to its operating position corresponding to the number of generators in service. It will be observed that no particular sequential operation of the generators is required since the calibration of the interrupter 23 depends only upon the number of generators connected to the controlled circuit.
  • spons'ive' circuit interru ter having an inductive conductor for e ecting operation of the interrupter, of an inductive shunt having a plurality of sections of substantially fixed inductance and havin bot-h its'ends connected to the terminals 0 said conductor, and connections whereby said conductor and said shunt are connected in the circuit con trolled by the interrupter with a selected number of sections of the shunt in parallel circuit with the conductor and the remaining sections of the shuntin series circuit relation with the conductor.
  • a high speed circuit interrupter comprising a movable circuit controllingmemer biased to the circuit-opening position, an electromagnet for holding the member in the circuit-closing. position, a conductor associated with said electromagnet for releasing said member, an inductive shunt for said conductor, and connections whereby said conductor and shunt are connected inthe circuit 1' controlled by said interrupter with one section of the shunt in parallel circuit with the conductor and another section of the shunt.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Breakers (AREA)
US24436A 1925-04-20 1925-04-20 Circuit controller Expired - Lifetime US1706124A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US24436A US1706124A (en) 1925-04-20 1925-04-20 Circuit controller
FR605485D FR605485A (fr) 1925-04-20 1925-09-07 Perfectionnements aux systèmes de réenclenchement automatique des disjoncteurs
FR31818D FR31818E (fr) 1925-04-20 1926-04-19 Perfectionnements aux systèmes de réenclenchement automatique des disjoncteurs
GB10385/26A GB250986A (en) 1925-04-20 1926-04-20 Improvements in and relating to electric circuit controllers
DEA47580D DE477692C (de) 1925-04-20 1926-04-21 Einstellvorrichtung fuer Gleichstrom-UEberstromschalter, insbesondere fuer schnellwirkende Gleichstrom-UEberstromschalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24436A US1706124A (en) 1925-04-20 1925-04-20 Circuit controller

Publications (1)

Publication Number Publication Date
US1706124A true US1706124A (en) 1929-03-19

Family

ID=21820575

Family Applications (1)

Application Number Title Priority Date Filing Date
US24436A Expired - Lifetime US1706124A (en) 1925-04-20 1925-04-20 Circuit controller

Country Status (4)

Country Link
US (1) US1706124A (fr)
DE (1) DE477692C (fr)
FR (2) FR605485A (fr)
GB (1) GB250986A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2555689A (en) * 1947-05-15 1951-06-05 Joy Mfg Co Spark limiting control circuits

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464377A (en) * 1946-06-20 1949-03-15 F W Sickles Company Pi type resistance capacitance filter unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2555689A (en) * 1947-05-15 1951-06-05 Joy Mfg Co Spark limiting control circuits

Also Published As

Publication number Publication date
DE477692C (de) 1929-06-13
FR31818E (fr) 1927-06-13
GB250986A (en) 1926-11-18
FR605485A (fr) 1926-05-27

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