US1800256A - Arrangement for the automatic interrupting of the net circuit of multiphase motors - Google Patents

Arrangement for the automatic interrupting of the net circuit of multiphase motors Download PDF

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Publication number
US1800256A
US1800256A US161892A US16189227A US1800256A US 1800256 A US1800256 A US 1800256A US 161892 A US161892 A US 161892A US 16189227 A US16189227 A US 16189227A US 1800256 A US1800256 A US 1800256A
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United States
Prior art keywords
current
switch
armatures
armature
overload
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Expired - Lifetime
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US161892A
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English (en)
Inventor
Keller Georg
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FIRM PAUL STROBACH
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FIRM PAUL STROBACH
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    • 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
    • H02H3/12—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 responsive to underload or no-load
    • H02H3/13—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 responsive to underload or no-load for multiphase applications, e.g. phase interruption

Definitions

  • phase-solenoid When the current fails in one phase, the corresponding phase-solenoid becomes ourrentless and its core closes the circuit of the protecting solenoid so that the releasing of the looking and consequently the instantaneous opening of the switch take place.
  • the invention consists in a protecting switch for multiphasecurrent-nets, in which for each phase one electromagnet is arranged through which the current flows and in which an automatic interruption of the net circuit is efiected as well when the current fails as when excess current occurs, but for this switch the combination of the following characteristic features is essential.
  • Each electromagnet acts upon at least two armatures, oscillatably mounted on the magnet-body of the electro-magnet, one of said armatures being attracted with adjustable retardation depending of the duration or strength of the magnet-excitation when a predetermined strength of current is being exceeded, whilethe other armature is permanently in contact with the magnet-body at a flow of current of any strength and drops OK as soon as the current ceases.
  • electro-magnets in which one coil-operates with two armatures the one of which is held attracted at flow ot current ofa certain voltage and drops off only, when the voltage descends under a certain currentstrength, while the other armature is at: tracted at the occurrence of the abnormal current-strength, has become known from maximum and minimum switches for .continuous currents.
  • the invention relates, however, to a multiphase current protecting switch and just in such a switch the utilization of electromagnets of the kind mentioned causes a number of advantages from which noids. The current-consumption of the coils.
  • a very im ortant consequence of the arrangement of the electromagnets with oscillatable armatures in the manner proposed is further, that the closing of the contacts of the phase-switch can be absolutely prevented as soon as disturbance exists in the net, for instance a short circuit.
  • Fig. 1 shows a connection diagram.
  • Fig. 2 shows the control element.
  • Fig. 3 shows a second connection diagram.
  • Fig. 4 shows a second form of construction
  • Figs. 5-9 show each one of the various forms of construction of the electro-magnet with the corresponding armatures.
  • the cores of the electromagnets EI, EII EIII are, with the exception of the form 0 construction shown inFigs. 6 and 9, of double T shape. Armatures c and e respective ly are pivotally connected tothe correspond-.
  • each armature carries the assoclated extendedcontact element, and this interrupts consequently the corresponding contacts d to (i
  • the armatures e and e, are also controlled by tension springs f and respectively the tension of the spring f,
  • Fig. 2 shows further that the armature e may act upon a rod k mounted on the core of the electro-magnet E1 in such a mannal direction against the action of a spring j the end I of said rod it being appropriately shaped and adapted to act upon a second rod n which can be shifted in a vertical direction against the action of a spring m, the lower v mg regulated in the manner shown in Fig. 2 by adjusting ner that said rod can be shifted in longitudil end 0 of this rodn resting upon the movable element of the contact d
  • a pressure rod p fixed onthe armature 6 also acts on this element.
  • Theelectro-magnets E11 and EIII are fitted in a similar manner as shown in Fig. 1.
  • the armature e is slightly biased towards the leftv byits spring f so that the slightest current flowing through the electromagnet E1 is suflicient to maintain the armature attracted. If this flow of current is interrupted which happens for example taking place for instance when the current in one'phase fails, the armature which is coordinated to this phase drops instantaneously and breaks the circuit for the holding electro-magnet b.
  • the right armature e is designed to act at excess currents of different strengths by adjusting the spring and this armature c is attracted only when the el'ec-, tromagnet ET is excited accordingly.
  • a third armature e is arranged in addition to the two armatures e and e a piston r beingconnected, by means of a rod 9 to the free end of said armature and moving in a cylinwith oil.
  • holes 6 are arranged close to the position of rest of the piston, oil flowing through these holes 6 from the oil bath in which the whole switch is arranged, into said cylinder and inversely oil flows out from the cylinder back into the oil bath.
  • the front end of the cylinder is closed by a cover plate having perforations and being adapted to be more or less uncovered by a slide.
  • the armature 6 operates, as described above.
  • the armature 6, acts at heavy overloadings, for instance at short circuiting, instantaneously, whilst the armature e acts in a similar manner to the armature e upon the movable element of the contact d but only after overloading has continued .for a long time.
  • three armatures are provided each acting in a different manner, said three armatures being provided for each row of electro-magnets EI, EII, EIII.
  • the armatures may be arranged in the manner shown in Fig. 5, and as shown in the diagram Fig. 3, on the core of the electro-magnet.
  • the armatures are all hinged to one member at three sides thereof.
  • the one iron-path is composed of two or'more portions.
  • the open portion A of the iron-core is of such dimension that at current-increase attracting of the other armature 6,, or this armature e and the armature 6, takes place.
  • Fig. 9 shows another form of construction, in which the electromagnets consist of two separate cores, two armatures being fixed to one core and the third armature being arranged alone on the other core.
  • Fig. 4 shows a construction of the control element and associated parts, in which the movement of the armatures 6 e and e are transmitted by mechanism comprising a rod t hingedly connected to the free ends of said armatures being adapted to act upon a pawl o pivotally mounted and controlled by a compression spring u.
  • the pawl 01 has a nose w designed to co-operate with a counter-nose of a rod 00, mounted on the switch bridge a and of the main three phase switch adapted to be operated by means of a handle 3 through the intermediary of a two armed lever z.
  • the handle 1 is employed for rein-serting the main switch and the pawl device is thereupon brought into its inoperative position.
  • a multiphase protective system comprising, in combination with a device to be protected several supply conductors each conductor comprising a first switch, a coil between said device to be protected and said first switch, a switch bridge common to all said first switchesincluding an electromagnet, the coil of said electromagnet for said switch bridge in shunt with two of said supply conductors, the armature of said electroma et being combined with said switch bri ge, a second switch in the circuit of said coil of said electromagnet, a low-current armature and an overload armature associated with each of said coils in said conductors each of said low-current armatures adapted to be held constantly attracted during the flow of current through its coil and adapted to drop upon failure of current and to open the corresponding second switch, each of" said overload armatures adapted to be attracted upon a predetermined current strength being exceeded and to open the corresponding second switch, and for throwing sai switch bridge in ofi' position upon deenergizing of said electromagnet by the
  • a multiphase protective system comprising in combination with a device to be protected, several supply conductors, each conductor comprisinga first switch and a coil between said device to be rotected and said first switch, a switch bri ge common to all said first switches, an electromagnet for said switch bridge the coil of said electromagnet in shunt with two of said conductors the armature of I said electromagnet combined with said switch bridge, a second switch in the circuit of the coil of said electromagnet, a low-current armature and a pair.
  • each of said lowcurrent armatures adapted to be held constantly attracted durin the flow'of current through its coil and adapted to drop upon failure of current to open said second switch
  • each of said overload armatures adapted to be attracted upon a predetermined current strength being exceeded and to open said second switch
  • an 011 brake for each of said overload armatures for introducing a time lag to render the action of one armature of each pair of overload armatures dependent also upon the time interval during which the maximum safe current is exceeded.
  • a multiphase protective system comprising in combination with a device to be protected, several supply conductors comprising each a switch, an electromagnet, a
  • low-current armature adapted to be constant- 1 attracted by its electromagnet during the flbw of current of any strength and a pair of overload armatures adapted to be attracted by their electromagnet upon a predetermined current strength being exceeded, a fluid brake adapted to retard the attraction movement of the corresponding pair of overload armatures to render their action dependent also upon the time interval during which the maximum safe current is exceeded, a switch bridge common to all said switches and means for throwing said switch bridge into ofi position, the low-current armatures and the oyerload armatures of all said electromagnets commonly controlling said throwi-ig-oif means, this control performed by the movement of any one of said low-current armatures upon failure of current in one of said conductors or by the attraction of any one of said overload armatures upon the predetermined strength of current being exceeded in one conductor.
  • a multiphase protective system comprising in combination with the device to be protected, several supply conductors comprising each a switch, a coil arranged between said device to be protected and said first switch, a switch bri ge common to all said first switches, an electromagnet for said switch bridge the coil of said lectromagnet in shunt with two of'said supply conductors, the armature of said electro-magnet combined with said switchbridge, a low-current armature and a pair of overload armatures associated with each of said coils in said supply conductors, each of said low current armatures adapted to be held constantly attracted during the flow of current through its coil, a second switch associated with each of said low current armatures, each of said overload armatures adapted tobe attracted upon a predetermined current strength being exceeded, a third switch associated with each of said pairs of overload armatures said second and said third switches connected in se ries and arranged in the circuit of the coil of the said electromagnet, means for throwing said switch bridge into oil-position upon de
  • a multiple protective system comprising in combination with the device to be protected, several supply conductors comprising each a switch, a coil between said device to- ,be protected and said first switch, an electro magnet the coil of said electromagnet in shunt with two of said supply conductors, a low-current armature constantly attracted by one of said coils during the flow of current of any strength, and an overload armature adapted to be attracted by one of said coils upon a predetermined current strenth being exceeded, a switch bridge common to the switches of all said supply conductors and controlled by said electro-magnet, means for throwing said switch bridge into ofi position the low-current armatures and the overload armatures of the coils of all of said supply conductors commonly controlling said thro'wing-ofi means by controlling the circuit to said electromagnet this control being performed by the movement of any one of said low-current.
  • a multiple protective system comprising in combination with the device to be protected, several supply conductors comprising each a switch, a coil between said device to be protected and said first switch, an electromagnet the coil of said electro magnet in shunt with two.
  • a switch bridge common to the switches of all said supply conductors and controlled by, said electro-magnet for throwing said switch bridge into ofi position, the low current armatures and the overload armatures of the coils of all of said supply conductors commonly controlling said throwing oflz' means by controlling the circuit of said electro-magnet, this control being performed by the movement of any one of said low-current armatures upon failureof current in one of said conductors or by the attraction of any one of said overload armatures upon the predetermined strength of current being exceeded in one of said conductors.

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  • Breakers (AREA)
  • Protection Of Generators And Motors (AREA)
  • Stopping Of Electric Motors (AREA)
  • Electromagnets (AREA)
US161892A 1926-02-28 1927-01-18 Arrangement for the automatic interrupting of the net circuit of multiphase motors Expired - Lifetime US1800256A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DD460437X 1926-02-28
DE1800256X 1926-03-24
GB694/27A GB291819A (en) 1926-02-28 1927-01-10 An arrangement for automatically interrupting the network circuit of polyphase motors

Publications (1)

Publication Number Publication Date
US1800256A true US1800256A (en) 1931-04-14

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Application Number Title Priority Date Filing Date
US161892A Expired - Lifetime US1800256A (en) 1926-02-28 1927-01-18 Arrangement for the automatic interrupting of the net circuit of multiphase motors

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US (1) US1800256A (de)
DE (1) DE460437C (de)
GB (1) GB291819A (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431886A (en) * 1941-06-13 1947-12-02 Pavitt Frederick James Over-current and under-current protective switch
US2486613A (en) * 1945-10-19 1949-11-01 Ite Circuit Breaker Ltd Two-armature selectively retarded electromagnet
US2539832A (en) * 1942-10-26 1951-01-30 Claude M Hathaway Apparatus for producing oscillographic records
US2553949A (en) * 1945-05-09 1951-05-22 Screw Machine Products Co Circuit protecting device for motors and the like
US2558524A (en) * 1946-10-04 1951-06-26 North Electric Mfg Company Relay construction
US2559913A (en) * 1947-07-07 1951-07-10 Frank T Foshee Overcurrent protective system for motor circuits
US2609425A (en) * 1949-10-24 1952-09-02 Winifred J Turnupseed Protective system for electrical apparatus connected with polyphase networks
US2632820A (en) * 1949-06-10 1953-03-24 Clark Controller Co Magnetically operated control mechanism
US2767356A (en) * 1952-04-03 1956-10-16 Olsson Gunnar Daniel Multiple armature marginal relay
US2794157A (en) * 1952-12-30 1957-05-28 Allen E Chisholm Polarized snap action magnetic switch
US2838718A (en) * 1953-05-28 1958-06-10 Ite Circuit Breaker Ltd Current limiting protection for contactors
US3001099A (en) * 1959-03-23 1961-09-19 Riley E Larkey Protecting device for three phase motor having shiftable rotor as a part of the assembly
US3139557A (en) * 1960-09-09 1964-06-30 Steelman Electric Mfg Company Overload protection device for polyphase systems
US4068280A (en) * 1976-05-17 1978-01-10 Basile Pietro Automatic circuit restoration device for polyphase feed lines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE753230C (de) * 1938-07-15 1953-04-16 Ver Kaliwerke Salzdetfurth A G Schutzschaltung fuer Drehstromverbraucher in Verbindung mit einem Schuetzenschalter

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431886A (en) * 1941-06-13 1947-12-02 Pavitt Frederick James Over-current and under-current protective switch
US2539832A (en) * 1942-10-26 1951-01-30 Claude M Hathaway Apparatus for producing oscillographic records
US2553949A (en) * 1945-05-09 1951-05-22 Screw Machine Products Co Circuit protecting device for motors and the like
US2486613A (en) * 1945-10-19 1949-11-01 Ite Circuit Breaker Ltd Two-armature selectively retarded electromagnet
US2558524A (en) * 1946-10-04 1951-06-26 North Electric Mfg Company Relay construction
US2559913A (en) * 1947-07-07 1951-07-10 Frank T Foshee Overcurrent protective system for motor circuits
US2632820A (en) * 1949-06-10 1953-03-24 Clark Controller Co Magnetically operated control mechanism
US2609425A (en) * 1949-10-24 1952-09-02 Winifred J Turnupseed Protective system for electrical apparatus connected with polyphase networks
US2767356A (en) * 1952-04-03 1956-10-16 Olsson Gunnar Daniel Multiple armature marginal relay
US2794157A (en) * 1952-12-30 1957-05-28 Allen E Chisholm Polarized snap action magnetic switch
US2838718A (en) * 1953-05-28 1958-06-10 Ite Circuit Breaker Ltd Current limiting protection for contactors
US3001099A (en) * 1959-03-23 1961-09-19 Riley E Larkey Protecting device for three phase motor having shiftable rotor as a part of the assembly
US3139557A (en) * 1960-09-09 1964-06-30 Steelman Electric Mfg Company Overload protection device for polyphase systems
US4068280A (en) * 1976-05-17 1978-01-10 Basile Pietro Automatic circuit restoration device for polyphase feed lines

Also Published As

Publication number Publication date
GB291819A (en) 1928-06-11
DE460437C (de) 1928-06-05

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