US1696611A - Protective device - Google Patents

Protective device Download PDF

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Publication number
US1696611A
US1696611A US33584A US3358425A US1696611A US 1696611 A US1696611 A US 1696611A US 33584 A US33584 A US 33584A US 3358425 A US3358425 A US 3358425A US 1696611 A US1696611 A US 1696611A
Authority
US
United States
Prior art keywords
armature
current
flux
pole
shunt
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
US33584A
Other languages
English (en)
Inventor
Gordon R Mcdonald
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 BE334355D priority Critical patent/BE334355A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US33584A priority patent/US1696611A/en
Priority to GB11871/26A priority patent/GB252697A/en
Priority to FR616727D priority patent/FR616727A/fr
Application granted granted Critical
Publication of US1696611A publication Critical patent/US1696611A/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
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current

Definitions

  • My invention relates tov improvements in protective devices and has for an object to provide an improved protective device which operates in response to the rate of increase of current at some predetermined value of current when the currentincreases slowly and at a lower value of current when the current increases rapidly.
  • Fig. 1 illustrates an embodiment of my invention in a circuit breaker
  • Figs. 2 and 3 illustrate the embodiment of my invention shown in Fig. 1 in elevation and perspective respectively, certain parts being shown cut away in Fig. 3.
  • Fig. 1 shows a circuit breaker mounted on a switchboard 1 and comprising a movable circuit controlling element such as a brush 2, which is arranged to bridge terminal studs 3 and 4.
  • the circuit breaker also comprises secondary contacts 5 and 6 which may be suitably disposed in an arc chute 7 provided with a blowout coil 8.
  • the brush 2 is mounted on an arm 9 pivoted at 10 and is arranged to be moved to the circuit closed position by a solenoid comprising a plunger 11 and to be held in the circuit closed position by a restrained underset toggle comprising links 12 and 13.
  • the toggle is restrained by a latching mechanism comprising a main latch 14 arranged to engage the link 13 at 15 and an auxiliary latch'16 arran ed to engage the main latch 14 at 17, the Iatches being biased to latching position by a slpring 18.
  • the circuit breaker In ig. 1, the circuit breaker is shown in the circuit closed position, the brush 2 being held against the bias of gravity and the brush pressure by the toggle and latching mechanism, To trip the circuit breaker, that is, to release the brush 2 for movement to the circuit open position, the auxiliary latch 16 is moved counterclockwise about its pivot 10. This releases the main latch 14, which then slips oil the link 13 and permits the toggles 12, 13 to buckle. The arm 9 is then free to turn clockwise.
  • I For tripping the circuit breaker, that is, releasing the latch 16 in response to abnormal circuit conditions, I provide means, in-
  • a con- .tinuous current at some predetermined value of current when the current increases slowly and at a lower value of current when the current increases rapidl shown more in detail in F prises an energizing windin which in'the case of adirect current circult breaker may be the terminal stud 4 as shown, an armature 20 having a portion 21 which is arranged on movement 0 counter-clockwise as seen in Fig. 2 to en ge the latch 16 whereby to release the latching .mechanism, and a magnetizable member 22 comprising two branches or main and shunt or parallel flux paths 23 and 24 for the flux through the armature. These aths present spaced poles 25, 26 of like po arit on opposite sides of the armature. e magthe armature in one direction,
  • comnetizable member 22 may be U-shaped to' straddle the stud 4 and may be supported by being secured thereto by a suitable fastening means such as a screw 27.
  • the shunt flux path comprises the magnetizable elements 24, 26, 28 and 29.
  • the pole piece or member 26 may be adjustably positioned in the member 29' so as to provide for changing the gap between the armature 20 and the pole 25.
  • the distribution of the flux of the magnetizable member 22 in the main and shunt flux paths is such that the armature 20, is maintained against the pole 26 of the shunt flux ath, the restraining eifect being increased Iry the bias of gravity and suitable adjusting means such as a spring 30, the tension of which is arranged to be varied by a screw 31 mounted in a suitable supporting member 32.
  • the shunt flux path 24 is arranged to saturate at some predetermined current such that the pull between the armature 20 and the pole 25 exceeds the pull between the armature 20 and the pole 26, the bias of gravity and the tension of the spring 30.
  • the portion 21 of the armature 20 moves downward and turns the latch 16 counterclockwise to trip the circuit breaker.
  • the attractive effort of the shunt flux path increases up to a certain point, that is, the current necessary 110 to saturate the shunt flux path.
  • This attractive efi'ort' then becomes substantially constarrtaand further increase in the current increases the .pull between the armature 20 and the pole until the armature,-
  • means for releasing the latching mechanism on the occurrence of abnormal circuit conditions comprising, a magnetizable member having main and shunt flux paths presenting two spaced poles,
  • the shunt path is arranged to saturate on a predetermined value of continuous current in said wind ng. 7 to effect the movement of the armature to the pole of the main path when a continuous current ncreases slowly in said winding to 'a value exceeding said predetermined value whereby to release the latching mechanism and by the fact that the shunt path is provided witha closed circuit winding to cited; a change in the distribution of the flux of said member in said paths on a rapidly increasing continuous current whereby to effeet the movement of the armature to the pole of the main path on a rapidly increasing current before the current reaches said predetermined value to release the latching mechanism.
  • a movable circuit controlling element is provided with a latching mechanism for holding theelement in circuit closing position
  • means for efl'ectin'g the release of the latching mechanism on the occurrence of abnormal circu t condltlons comprising an and a latching mechanism for holding the, energizing winding, a magnetizable member circuit breaker closed, means for releasing the latching mechanism on the occurrence of abnormal circuit conditions comprising, an armature having a'portion arranged on movement of the armature in one direction to engage the latching mechanism whereby to release the same, an energizing winding, a magnetizable member comprising two branches arranged to form parallel magnetic paths for the flux through the armature, one
  • branches being arranged magnetically to saturate on the occurrence of a slowly increasing continuous current in said winding whereby to efl'ect movement of the armature in said direction when the currenthas reached a predetermined value, and means for efi'ecting movement of the armature in said direction on the occurrence of a rapidly:
  • a magnetizable member having main and shunt flux paths presenting two spaced poles, an energizing winding for said member, an armature having one end movable between said poles, means for biasing said end of the armature to the pole of the shunt path said member being constructed so that the distribution of the flux in said paths with a continuous current in said winding below a predetermined value is such as to assist the biasing means to hold the end of the armature against the pole of the shunt path, said shunt path being arranged to saturate with a continuous current in said winding above said predetermined value to effect the movement of the end of the armature to the pole of the main path when a continuous current increases slowly in said winding, and a closed circuit winding associated with said shunt path for effecting a chan e in the distribution of the fluxes in sai paths on a rapidly increasing continuous current in said windin whereby to effect the movement of the an of the

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  • Breakers (AREA)
US33584A 1925-05-28 1925-05-28 Protective device Expired - Lifetime US1696611A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE334355D BE334355A (enrdf_load_stackoverflow) 1925-05-28
US33584A US1696611A (en) 1925-05-28 1925-05-28 Protective device
GB11871/26A GB252697A (enrdf_load_stackoverflow) 1925-05-28 1926-05-06
FR616727D FR616727A (fr) 1925-05-28 1926-05-27 Perfectionnements aux appareils électriques de protection, tels que les disjoncteurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US33584A US1696611A (en) 1925-05-28 1925-05-28 Protective device

Publications (1)

Publication Number Publication Date
US1696611A true US1696611A (en) 1928-12-25

Family

ID=21871243

Family Applications (1)

Application Number Title Priority Date Filing Date
US33584A Expired - Lifetime US1696611A (en) 1925-05-28 1925-05-28 Protective device

Country Status (4)

Country Link
US (1) US1696611A (enrdf_load_stackoverflow)
BE (1) BE334355A (enrdf_load_stackoverflow)
FR (1) FR616727A (enrdf_load_stackoverflow)
GB (1) GB252697A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486596A (en) * 1945-10-19 1949-11-01 Ite Circuit Breaker Ltd Time delay for selective tripping
US2486613A (en) * 1945-10-19 1949-11-01 Ite Circuit Breaker Ltd Two-armature selectively retarded electromagnet
US2824925A (en) * 1951-06-23 1958-02-25 Westinghouse Electric Corp Electromagnetic trip circuit interrupters

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479308A (en) * 1945-03-17 1949-08-16 Armour Res Found Magnetic recorder head
US2829217A (en) * 1954-05-25 1958-04-01 Gen Electric Current responsive control device
US2939929A (en) * 1957-08-22 1960-06-07 Gen Electric Electric circuit breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486596A (en) * 1945-10-19 1949-11-01 Ite Circuit Breaker Ltd Time delay for selective tripping
US2486613A (en) * 1945-10-19 1949-11-01 Ite Circuit Breaker Ltd Two-armature selectively retarded electromagnet
US2824925A (en) * 1951-06-23 1958-02-25 Westinghouse Electric Corp Electromagnetic trip circuit interrupters

Also Published As

Publication number Publication date
FR616727A (fr) 1927-02-07
BE334355A (enrdf_load_stackoverflow)
GB252697A (enrdf_load_stackoverflow) 1926-11-04

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