US1484220A - Multiphase translating device - Google Patents

Multiphase translating device Download PDF

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Publication number
US1484220A
US1484220A US441462A US44146221A US1484220A US 1484220 A US1484220 A US 1484220A US 441462 A US441462 A US 441462A US 44146221 A US44146221 A US 44146221A US 1484220 A US1484220 A US 1484220A
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multiphase
safety devices
translating device
current
star
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US441462A
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K R Ihamuotila
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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
    • H02H3/08—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 excess current
    • H02H3/083—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 excess current for three-phase systems

Definitions

  • My invention relates to machinery and apparatus for generating or using a multiphase electrical current and has .ror its object to provide safety devices for such machines and apparatus.
  • My invention consists in locally arrangin the said safety devices at the star-point or the star connected system. According to the actual intensity of the current, the said safety devices are arranged either singly in combination with every winding or phase, or jointly in connection with the entire system of the windings or phase.
  • the safety devices d, e and f form a triangle or delta. Because of this delta connection, it will be apparent that the said safety devices are charged only with a portion of the current of the phase which portion amounts to the cubic-root of the total current. Therefore, the said safety devices may be diminished in size down to the cubic-root of the size heretofore used. Moreover, by the use of fuses, an absolute isochronism of partial currents in all phases of the machine or apparatus will be established, because, if one fuse has melted, the other two fuses, which had been charged with the cubic-root of the current, will melt immediately, as they now Serial No. 441,462.
  • a further advantage of my invention consists in the possibility of safeguarding machines with strong current by fuses, instead of by switches, whereby part of a surplus of the current load is branched off.
  • the safety devices are combined into a single plug having three contacts.
  • a multi-phase translating device the combination with a plurality of operating windings, of a plurality of safety devices connected in delta, said operating windings being connected in star through said delta connection of safety devices whereby the operation of any one of said safety devices causes the operation of one or more of the other safety devices.

Description

Feb. 19, 1924. 1,484,220
KR. IHAMUOTILA- MULTIPHASE TRANSLATING DEVICE Filed Jan. 31 1921 Patented Feb. 19, 1924.
UNITED STATES K R. IHAMUOTILA, OF HELSINGFORS, FINLAND.
MULTIPHASE TRANSLATING DEVICE.
Application filed January 31, 1921.
T all whom it may concern Be it known that I, K RICHARD IHAM- UOTILA, a citizen of Finland, residing at Helsingfors, Finland, have invented certain new and useful Improvements in Multiphase Translating Devices (for which I have filed an application in Germany on January 8th, 1919), of which the following is a specification.
My invention relates to machinery and apparatus for generating or using a multiphase electrical current and has .ror its object to provide safety devices for such machines and apparatus.
My invention consists in locally arrangin the said safety devices at the star-point or the star connected system. According to the actual intensity of the current, the said safety devices are arranged either singly in combination with every winding or phase, or jointly in connection with the entire system of the windings or phase.
On the accompanying drawing an apparatus embodying my invention is diagrammatically illustrated by way of example.
At the zero point of the phases a, b, and 0, arranged in star connection, the safety devices d, e and f form a triangle or delta. Because of this delta connection, it will be apparent that the said safety devices are charged only with a portion of the current of the phase which portion amounts to the cubic-root of the total current. Therefore, the said safety devices may be diminished in size down to the cubic-root of the size heretofore used. Moreover, by the use of fuses, an absolute isochronism of partial currents in all phases of the machine or apparatus will be established, because, if one fuse has melted, the other two fuses, which had been charged with the cubic-root of the current, will melt immediately, as they now Serial No. 441,462.
receive the full current. Such absolute synchronism of partial current in all phases of the machine is particularly valuable. as it will prevent the machine, particularly a motor, from being burned out, which frequently occurs.
A further advantage of my invention consists in the possibility of safeguarding machines with strong current by fuses, instead of by switches, whereby part of a surplus of the current load is branched off.
The safety devices, the terminals of which are connected by a delta connection, as above stated, thus forming a complete system, are combined into a single plug having three contacts.
This feature alone considerably simplifies and cheapens the construction at the same time greatly adding to the safety of all multiphase current-machines.
I claim as my invention:
1. In a multi-phase translating device, the combination with a plurality of operating windings, of a plurality of safety devices connected in delta, said operating windings being connected in star through said delta connection of safety devices whereby the operation of any one of said safety devices causes the operation of one or more of the other safety devices.
2. The combination as specified in claim 1, in which the said safety devices are combined into a single plug, having a number of contacts corresponding to the number of safety devices.
In testimony whereof I have affixed my signature in presence of two witnesses.
K. R. IHAMUOTILA.
Witnesses K. A. KosKINnN, O. TUOMINA.
US441462A 1921-01-31 1921-01-31 Multiphase translating device Expired - Lifetime US1484220A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467862A (en) * 1946-01-12 1949-04-19 Gen Electric Polyphase motor protective means
US2662203A (en) * 1952-03-15 1953-12-08 Gen Electric Three-phase alternating current apparatus with thermal protection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467862A (en) * 1946-01-12 1949-04-19 Gen Electric Polyphase motor protective means
US2662203A (en) * 1952-03-15 1953-12-08 Gen Electric Three-phase alternating current apparatus with thermal protection

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