US1605275A - Time relay - Google Patents

Time relay Download PDF

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Publication number
US1605275A
US1605275A US747852A US74785224A US1605275A US 1605275 A US1605275 A US 1605275A US 747852 A US747852 A US 747852A US 74785224 A US74785224 A US 74785224A US 1605275 A US1605275 A US 1605275A
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US
United States
Prior art keywords
temperature
armature
time relay
leg
iron
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
US747852A
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English (en)
Inventor
Petersen Wilhelm Henning
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US1605275A publication Critical patent/US1605275A/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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/58—Thermally-sensitive members actuated due to thermally controlled change of magnetic permeability
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operation after the programme is completed
    • H01H43/30—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operation after the programme is completed with timing of actuation of contacts due to thermal action
    • 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/44—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay

Definitions

  • WILHELM HENN'IlG rnrERsN or GAMLA ALLMANNA SVENSKA ELEKTBISKA AIKTIEBOLAGET, OF VASTEBAS, SWEIDEN, 'A'
  • serial no Timev relays 'based on'the thermic principle, that is, in which the heat produced a resistance member by the traversing cur- ⁇ rent is stored up ina body and after in- 5 creasing the temperature -of said body, up to a certain limit, in some way ca'uses' ainovement leading to release,.are often considered as appropriate especially for -the protection of small loadl objects, as, separate motors or heating elements. This is. for'the reason, that such relays are -adapted for copying, V more or less truly, the temperature fluctuations of the load object, and can ⁇ thus be readily adjusted to release even at th/e instant whenlthere is realdanger.
  • the release is generally dictated either by' thefusion of the ⁇ resistance member or of an adjacent jpart, which is rather unsuitable, as it necessitates the insertion of spare parts, or by deformations caused by the heat, -which however are comparatively Asmall and slow and therefore must be combined withl a specialmechanism with, 'Springs or electromagnets for the r'elef ⁇ n ⁇ g movement.l In this'way a comparativ complicated system of ⁇ movable parts'is obtained which may easily get in disorder.
  • the present invention relates to a time relay comprisin a heatingmember and an ut having a minimum of movable parts and 'therefore bein extremely simple and reliable.
  • the c aracteristic feature of the invention is that the heating member itself or a part in close connection therewith forms pait of the magnetic circuit and consists of a material which is ferromagnetic at ordinary temperature but becomes only feebly magnetic at a comparatively low rise of temperature, so
  • the rest of the magnetic circuit preferably is composed mainly of iron, and the heating member forming part thereof may lie immediately adj acent to the air-'gap between the fixed ⁇ portion of the circuit and the armature, which is generally .to be pre- 'ferred, or in other place.
  • FIG. 1 A preferred form of; the invention is shown in the accompanying'drawing in a side view in Fig. 1 and in a plan view (with certain parts taken away) in Fig. 2.
  • v1 is an electromagnet having a .threelegged core, in the, middle leg of which the armature 2 is rotatably mounted so as to occupy different positions, depending upon whether the attraction from one outer leg or the other is the Stronger one. Normally the armature is assumed to be'more stronglyl attracted by the leftL leg so as to be kept in the position shown in the drawing, Be-
  • the secondary winding is/a coil 5 on the same core, having few turns
  • the current in the coil 4 thus also uv the resistance member' 3
  • the temperature in said member rises so' much that its permeability sinks substantially below its normal value.
  • the magnetic induction is therefore forced over in the other leg of the magnet, and finally the attraction thereof will predominate, so that the armature is thrown over and operates 'a movable contact 6 which. it presses againstl a stationary one 7, or performs any other suitable releasing movement.
  • the arrangement may be such, that the releasing motion does not takeV place until the membel1 3 has practically lost its ferromagnetic properties, or such that release occurs already when its permeability has been substantially reduced.
  • the adjustment of the relay for different intensities of current or for diflerent releasing time limits can be dictated in a known manner, in part by connecting a ⁇ greater or smaller portion of the primary magnet ,coil 4 in circuit by means of a series of taps 8 in part by a screw 9 regulating the normal value of the air gaps at the two ends of the a-rmature.
  • a spring 10 keepsthe armature in its normal position when there is no current on the relay.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnets (AREA)
  • Thermally Actuated Switches (AREA)
US747852A 1923-12-10 1924-11-04 Time relay Expired - Lifetime US1605275A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1605275X 1923-12-10

Publications (1)

Publication Number Publication Date
US1605275A true US1605275A (en) 1926-11-02

Family

ID=20423036

Family Applications (1)

Application Number Title Priority Date Filing Date
US747852A Expired - Lifetime US1605275A (en) 1923-12-10 1924-11-04 Time relay

Country Status (3)

Country Link
US (1) US1605275A (de)
DE (1) DE438121C (de)
FR (1) FR588469A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953723A (en) * 1957-05-08 1960-09-20 Texas Instruments Inc Control device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA432267A (en) * 1940-07-26 1946-01-01 Canadian Westinghouse Company Overload relay
DE1095379B (de) * 1958-11-13 1960-12-22 Continental Elektro Ind Ag Thermischer UEberstromausloeser
US4550298A (en) * 1984-01-23 1985-10-29 Rte Corporation Trip assembly for a circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953723A (en) * 1957-05-08 1960-09-20 Texas Instruments Inc Control device

Also Published As

Publication number Publication date
DE438121C (de) 1926-12-10
FR588469A (fr) 1925-05-07

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