US1713209A - Automatic reclosing circuit-breaker system - Google Patents

Automatic reclosing circuit-breaker system Download PDF

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Publication number
US1713209A
US1713209A US201674A US20167427A US1713209A US 1713209 A US1713209 A US 1713209A US 201674 A US201674 A US 201674A US 20167427 A US20167427 A US 20167427A US 1713209 A US1713209 A US 1713209A
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US
United States
Prior art keywords
circuit
relay
contacts
circuit breaker
source
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
US201674A
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English (en)
Inventor
Arvid E Anderson
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
Priority to BE352308D priority Critical patent/BE352308A/xx
Priority to FR35539D priority patent/FR35539E/fr
Application filed by General Electric Co filed Critical General Electric Co
Priority to US201674A priority patent/US1713209A/en
Priority to GB18657/28A priority patent/GB292960A/en
Application granted granted Critical
Publication of US1713209A publication Critical patent/US1713209A/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
    • 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
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection

Definitions

  • My invention relates to automatic reclosing circuit breaker systems and particularly to such a system in which a circuit breaker is arranged to connect a source of current to a load circuit which may or may not be energized by another source at the time the circuit breaker is reclosed.
  • a load circuit which may or may not be energized by another source at the time the circuit breaker is reclosed.
  • the load circuit is not energized by another source itis desirable to reclose the circuit breaker in response to one predetermined condition thereof and when it is energized by another source it is desirable to reclose the circuit breaker in response to a different predetermined condition thereof
  • one object of my invention is to pro ide an improved arrangement for controlling the reclosing of a circuit breaker under these various conditions of theload circuit. More particularly my invention relates to an improvement of the arrangement covered by my Letters Patent 1,626,495 granted'April 26, 1927.
  • 1 is a source of current, shownas a generator, which is arranged to be connected to a load circuit 2 by means of acircuit breaker 3 which may be of any suitable type, examples of which are well known in the art.
  • the load circuit 2 is arranged to be supplied by other source of current (not shown).
  • the circuit breakor 3 is of the well known contact-or type and is provided with a closing coil 4 which, when energized, maintains the circuit breaker closed.
  • the circuit of the closing coil 1 is controlled by an overload responsive device 5 which is arranged in any suitable manner, examples of which are Well known in the art, so as to eflfect the deenergization of the closing coil 4: and the opening of the circuit breaker 3 upon the occurrence of predetermined abnormal load conditions.
  • the overload responsive device 5 is an over-current relay whose coil is connected so as to be energized in accord ance with the current output of the source 1.
  • the relay 5 is arranged to open its contacts 6 in the circuit of the closing coil 4 when the current output of the source lexceeds' a predetermined value.
  • the relay 8 is connected across the main terminals of the circuit breaker 3 in shunt with a load indicating resistor 9 which has a relatively high resistance so that it limits the current flowing from the source 1 to the load circuit 2 to a relatively small value, when the circuit breaker 8 is open.
  • the amount of current through the resistor 9 however is an indication of the condition of the load circuit.
  • the voltage drop across the resister 9 is substantially equal to the voltage of the source 1, whereas it the load circuit is energized by some other source when the circuit breaker 3 is open, the voltage drop across the resistor 9 is considerably less than I use this difference in the "voltage drop across the resistor as a means of determining whether the reclosing of the circuit breaker shall be effected by the relay 7 or the relay 8.
  • the relay 8 is provided with two armatures 10 and 11 which are arranged in any suitable manner so that the armature 10 is attracted by the relay so as to open its contacts 12 when a relatively small voltage is impressed on the winding of the relay and. the armature 11 is attracted to close its contacts 13 only when a relatively high voltage is impressed on the winding of the relay 8.
  • the contacts 12, when closed, arc'arranged to effect the completion of a circuit for the closing coil l so to close the circuitbreaker atter it has been open a predetermined length of time, and the contacts 18, when closed, are arranged to render the reclosing relay 7 operative to ciicct the reclosing of the circuit breaker in response to the voltage across 0 n (Ll) the load circuit 2. i
  • the voltage drop across the resistor 9 that is required to cause the relay 8 to attract its armature 11 and close the contacts 13 is so great that it only occurs source 1 and the load circuit 2 is less than a predetermined relatively smaller value.
  • the recloslng relay 7, which is arranger to respond to the voltage of the load circuit 7 V 2, may be of any suitable type, examples of which are Well known in the art.
  • the relay 7 18 oil the well known polarized type comprising a polarizingwlnding 15 which is arranged to be connected across the source 1 after the circuit breaker 3 .has been open a predetermined len th of time and an o aeratin windin 16. i wh ch is arranged to be connected across the load circuit 2 when the relay 8 closes its con tacts 13.
  • the relay 7 is arranged to close its contacts 17 when thevoltage across the load circuit exceeds a predetermined value.
  • the contacts 17 are in a circuit for the closing coil 4.
  • the relay 7 therefore isarranged to effeet the closing of the circuit breaker 3 when the load circuit is not energized by another source and the voltage across the load circult is above a predetermined value and the relay 8 is arranged to effect the closing of the circuit breaker when the load circuit is energized by another sourceand the difierence between the voltage of the source 1 and the'load ci-rcuit 2 is less than a predetermined value.
  • 2O isa controlswitch wh ch is connected in the circuits or"; tl e various'controldevices so that when it is openedit renders the reclosing equipment inoperative. 7 i
  • the voltage drop across the res1stor'9 causes the relay 8 to be energized an amount depending upon the condition of the load circuit 2. It the load circuit is not'energized at some other point, the voltage drop across the resistor 9 is suflicient to cause the relay 8a to attract both of its armatures 10 and 11 so that the contacts 12 are opened and thecontacts 13are closed. It the load circuit is energized at some other point, the voltage dropacrossthe resistor 9 is sufficient only to attract the armature 1O tacts 12. r a, 7
  • This circuit is from one side or" the load circuit' 2, through contacts'13of relay 8, conductor 26, operating winding 16' (it-relay 7 to the other side'ofthe load circuit.”
  • The" energization of the winding 16 alone is not sufficient to close the contacts 17 of the relay 7 against the force exerted by the spring 27; As soon as the contacts 18 of the overload re lay 5 are closed a circuit is completed across the source 1 for the polarizing winding 15 of the relay 7.
  • This circuit is from one ter-' nnnalof the source lthrough contacts 21 of.
  • the circuit breaker 3 by closing its auxiliary contacts 23 completes the heretofore described locking circuit for the closing coil 4 tomaintain the closing coilenergiz'ed after the circuit breaker closes.
  • the auxiliary contacts 23 are closed before auxiliarycontacts 28 are opened so that the look ing circuit for the closing coil 4 is completed before the above traced energizing circuit is opened.
  • the relay 8 maintains its contacts 12 open.
  • the relay 8 closes its contacts 12 and completes a circuit for the closing coil 4 if the circuit breaker 3 has been open long enough to permit the contacts 18 of the overload relay 5 to close.
  • This circuit is from one terminal of the source 1, through contacts 21 of switch 20, conductor 22, auxiliary contacts 28 on the circuit breaker 3, conductor 29, contacts 18 of overload relay 5, conductor 30, contacts 12 of relay 8, conductor 24, contacts 6 of overload relay 6, closing coil 4, to the other terminal of the source 1.
  • the closing of the circuit breaker 3 effects the completion of the heretofore described holding circuit for its closing coil 4 and the deenergization of the coil of relay 8 in the manner above described.
  • an automatic reclosing circuit breaker system a source of current, a load circuit, a circuit breaker for connecting said source to said circuit, means responsive to a predetermined condition of said load circuit for controlling the reclosing of said circuit breaker, and a combined selective and reclosing relay arranged to render said first mentioned reclosing means responsive to said predetsrmined condition of the load circuit under certain predetermined conditions of said load circuit and for effecting the reclosing of said circuit breaker under other predetermined conditions of said load circuit.
  • an automatic reclosing circuit breaker system a source of current, a load circuit, a circuit breaker for connecting said source to said circuit, means for effecting the opening of said circuit breaker, a reclosing relay responsive to the voltage across said load circuit for controlling the reclosing of said circuit breaker, and a-single relay responsive to the voltage difference between said source and said load circuit when said circuit breaker is open for rendering said reclosing relay responsive to the load circuit voltage when the voltage difference exceeds a predetermined value and for effecting the closing of said circuit breaker when the voltage difference is less than a predetermined value.
  • a source of current a load circuit, a circuit breaker for connecting said source to said circuit, means for effecting the opening of said circuit breaker, a reclosing relay including an operating winding, and a relay responsive to the voltage difference between said source and said load circuit when said circuit breaker is open for connecting said operating winding across said load circuit when the voltage difierence exceeds a predetermined value and for effecting the reclosing of said circuit breaker when the voltage difference is less than a predetermined value.
  • circuit breaker for connecting said source to said circuit, overload responsive ineanstor effecting the opening of said circuit breaker, current limiting means arranged to be connected in series between said source and load c1rcu1t'wien said c1rcu1t breaker is open, electrores )onsive 'means arran 'ed when ener- I I: 1 e n glzed to effect the closing ot said circuit breaker, an energizing circuit for s id electroresponsive means, contacts in said energizing circuit arranged to be closed by said 1' said circuit breaker has been open a predetermined length of time, other contacts in said energizing cir-- cuit, a reclosing relay including a voltage Winding for controlling certain of said other contacts, and a relay responsive to the voltage drop across said current limiting means for effecting the connection of saidvoltage windcircuit when the voltage drop across said current limiting means exceeds a predeter mined value and for effecting the closing
  • a source of current, load circuit a circuit breaker torconncctinglsaid source to said circuit, overload responsive means for effecting the opening of said circuit breaker, currentlimiting means arranged to be conneeted in series between said source and load circuit when said circuit breaker is open, elcctroresponsive means arranged when energized to effectthe.

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  • Emergency Protection Circuit Devices (AREA)
US201674A 1927-06-27 1927-06-27 Automatic reclosing circuit-breaker system Expired - Lifetime US1713209A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE352308D BE352308A (en, 2012) 1927-06-27
FR35539D FR35539E (fr) 1927-06-27 1926-06-20 Perfectionnements aux systèmes de disjoncteurs à réenclencnement automatique
US201674A US1713209A (en) 1927-06-27 1927-06-27 Automatic reclosing circuit-breaker system
GB18657/28A GB292960A (en) 1927-06-27 1928-06-27 Improvements in and relating to automatic reclosing circuit breaker systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US201674A US1713209A (en) 1927-06-27 1927-06-27 Automatic reclosing circuit-breaker system

Publications (1)

Publication Number Publication Date
US1713209A true US1713209A (en) 1929-05-14

Family

ID=22746810

Family Applications (1)

Application Number Title Priority Date Filing Date
US201674A Expired - Lifetime US1713209A (en) 1927-06-27 1927-06-27 Automatic reclosing circuit-breaker system

Country Status (4)

Country Link
US (1) US1713209A (en, 2012)
BE (1) BE352308A (en, 2012)
FR (1) FR35539E (en, 2012)
GB (1) GB292960A (en, 2012)

Also Published As

Publication number Publication date
FR35539E (fr) 1930-03-22
BE352308A (en, 2012)
GB292960A (en) 1929-10-28

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