US1830541A - Instrument transformer - Google Patents
Instrument transformer Download PDFInfo
- Publication number
- US1830541A US1830541A US462681A US46268130A US1830541A US 1830541 A US1830541 A US 1830541A US 462681 A US462681 A US 462681A US 46268130 A US46268130 A US 46268130A US 1830541 A US1830541 A US 1830541A
- Authority
- US
- United States
- Prior art keywords
- core
- parts
- joint
- instrument transformer
- closed
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
Definitions
- My invention relates to instrument transformers of the type in which a winding is mounted on a core which is separable to permit it to be opened and placed around a current carrying conductor.
- a transformer may be used for a variety of purposes but is commonly used in connection with an ammeter for measuring the current in the conductor which it surrounds. It is desirable that the contacting surfaces of the two-part core fit together accurately so that the reluctance of the flux path through the core may be low and it is the general object of the invention to provide an improved support for the two core parts so arranged that the contacting surfaces of the core parts may fit accurately when brought together.
- Fig. 1 is a view of an instrument transformer constructed in accordance with the invention
- Fig. 2 is a view of the two parts of the core shown in Fig. 1
- Fig. 3 is a perspective view of 'one of the core parts.
- the transformer w ich is shown in t e drawings as illustrative of the invention includes a ring shaped magnetic core divided into two separable parts 10 and 11 by two joints at opposite sides of the core.
- the contacting surfaces at these joints preferably lie in a single plane passing through the axis of the core and the surfaces at each joint are finished to fit together accurately.
- Each of the core parts 10 and 11 is formed of a stack of magnetic laminations secured between a pair of supporting end plates 12 by rivets.
- the two core parts 10 and 11 are pivoted together near one of their joints by a bolt 13 extending through openings 14 in.
- a secondary winding 18 is formed in two sections which surround the two core parts 10 and 11 respectively and is connected to 1930. Serial No. 462,681.
- a strap 21 is attached to the extensions l5 of the end plates 12 for convenience in carrying the transformer.
- a low reluctance path for the magnetic flux in the core is desirable and this makes it important that the contacting surfaces at each core joint be accurately fitted and that they be pressed tightly together when the core is held closed by the latch 17
- the openings 14 in at least one pair of the extensions 15 of the end plates 12 are enlarged or elongated so as to fit loosely on the pivot bolt 13 and thus the two core parts 10' and 11 are pivoted loosely together.
- the loose fit in this pivotal connection assures that both core joints may be closed tightly.
- the latch 17 holds the core joint nearest this latch tightly closed.
- the other core joint is held tightly closed by a tension spring 22 connected by bolts 23 between the extensions 15 of the end plates 12 of the two core parts.
- a stop 24 pivoted to one core part and having a slot engaging a pin on the other core part may be provided to limit the extent to which the core may be opened.
- the invention provides an instrument transformer with a core having two separable pivotally connected parts which may be held tightly together without the necessity for accuraite workmanship in the pivotal joint. There is also the advantage that any wear in the pivotal connection between the core parts cannot affect the closing of the core and the tightness of its joints when closed.
- An instrument transformer including a ring shaped core divided into two sepumne parts by two joints, said two parts of the core being loosely pivoted together near one of said 10ints, a tension spring connected between the ends of said core parts nearest said pivotal connection to close the adjacent joint tightl when the other joint dosed, and means or holding said other joint tigi'nt- 1y closed.
Description
Nov, 3, 1931; H. E. HARRIS INSTRUMENT TRANSFORI BR Filed June 20. 1930 I Inventofi H'ITGJTI Eli Harris,
I His Attcrney.
il atented Nov. f5, 3193?.
UNITED STATES HI'RAM E. HARRIS, F SWAMPSCQTT, MASSACHUSETTS, ASSIGNOR T0 GENERAL ELEC-.
PATENT OFFICE TRIO COMPANY, A CORIORATION OF NEW YORK INSTRUMENT TRANSFORMER Application filed Innc 20,
My invention relates to instrument transformers of the type in which a winding is mounted on a core which is separable to permit it to be opened and placed around a current carrying conductor. Such a transformer may be used for a variety of purposes but is commonly used in connection with an ammeter for measuring the current in the conductor which it surrounds. It is desirable that the contacting surfaces of the two-part core fit together accurately so that the reluctance of the flux path through the core may be low and it is the general object of the invention to provide an improved support for the two core parts so arranged that the contacting surfaces of the core parts may fit accurately when brought together.
The invention will be better understood from the following description taken in connection with the accompanying drawings 'in which Fig. 1 is a view of an instrument transformer constructed in accordance with the invention; Fig. 2 is a view of the two parts of the core shown in Fig. 1, and Fig. 3 is a perspective view of 'one of the core parts.
Like reference characters indicate similar parts in the different fi ures of the drawin s.
The transformer w ich is shown in t e drawings as illustrative of the invention includes a ring shaped magnetic core divided into two separable parts 10 and 11 by two joints at opposite sides of the core. The contacting surfaces at these joints preferably lie in a single plane passing through the axis of the core and the surfaces at each joint are finished to fit together accurately. Each of the core parts 10 and 11 is formed of a stack of magnetic laminations secured between a pair of supporting end plates 12 by rivets. The two core parts 10 and 11 are pivoted together near one of their joints by a bolt 13 extending through openings 14 in.
A low reluctance path for the magnetic flux in the core is desirable and this makes it important that the contacting surfaces at each core joint be accurately fitted and that they be pressed tightly together when the core is held closed by the latch 17 The openings 14 in at least one pair of the extensions 15 of the end plates 12 are enlarged or elongated so as to fit loosely on the pivot bolt 13 and thus the two core parts 10' and 11 are pivoted loosely together. The loose fit in this pivotal connection assures that both core joints may be closed tightly. The latch 17 holds the core joint nearest this latch tightly closed. The other core joint is held tightly closed by a tension spring 22 connected by bolts 23 between the extensions 15 of the end plates 12 of the two core parts. A stop 24 pivoted to one core part and having a slot engaging a pin on the other core part may be provided to limit the extent to which the core may be opened.
The invention provides an instrument transformer with a core having two separable pivotally connected parts which may be held tightly together without the necessity for accuraite workmanship in the pivotal joint. There is also the advantagethat any wear in the pivotal connection between the core parts cannot affect the closing of the core and the tightness of its joints when closed.
The invention has been explained by describing and illustrating a particular form thereof but it will be obvious that changes may be made without departing from the spirit of the invention or the scope of the 2. An instrument transfo v separable two part core W1" mo jGIH-ES,
two parts of the core being looseiy pivoted together near one of said joints, and. a tension spring connected between the ends of said core parts nearest said pivotai connection to close the adiacent joint tightly when the other joint is closed.
3. An instrument transformer including a ring shaped core divided into two sepumne parts by two joints, said two parts of the core being loosely pivoted together near one of said 10ints, a tension spring connected between the ends of said core parts nearest said pivotal connection to close the adjacent joint tightl when the other joint dosed, and means or holding said other joint tigi'nt- 1y closed. V
In witness whereof, I have hereunto set my hand this seventeenth day of Jame 1930.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US462681A US1830541A (en) | 1930-06-20 | 1930-06-20 | Instrument transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US462681A US1830541A (en) | 1930-06-20 | 1930-06-20 | Instrument transformer |
Publications (1)
Publication Number | Publication Date |
---|---|
US1830541A true US1830541A (en) | 1931-11-03 |
Family
ID=23837378
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US462681A Expired - Lifetime US1830541A (en) | 1930-06-20 | 1930-06-20 | Instrument transformer |
Country Status (1)
Country | Link |
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US (1) | US1830541A (en) |
Cited By (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2431189A (en) * | 1946-03-28 | 1947-11-18 | Gen Electric | Electromagnetic induction apparatus |
US2447366A (en) * | 1943-09-01 | 1948-08-17 | Bendix Aviat Corp | Coil and mounting therefor |
US2452901A (en) * | 1944-08-16 | 1948-11-02 | Gen Electric | Electromagnetic induction apparatus |
US2494206A (en) * | 1946-04-23 | 1950-01-10 | Wayne M Ross | Electrical measuring instrument |
US2677078A (en) * | 1947-09-30 | 1954-04-27 | Bendix Aviat Corp | Electrical apparatus |
US2779927A (en) * | 1951-05-24 | 1957-01-29 | Gen Electric Co Ltd | A. c. electrical measuring instruments |
US2789268A (en) * | 1955-09-27 | 1957-04-16 | Baltimore Gas And Electric Com | Method and apparatus for identifying electric conductors |
DE976371C (en) * | 1954-11-17 | 1963-07-25 | Licentia Gmbh | Current transformer |
US3253215A (en) * | 1959-09-30 | 1966-05-24 | Automatic Switch Co | Overload current detecting device having laminated split core means coupled to a holding circuit with indicator |
US3725832A (en) * | 1971-10-12 | 1973-04-03 | Schwertzer E Mfg Co Inc | Magnetic core structure |
US4048605A (en) * | 1976-04-05 | 1977-09-13 | Sangamo Electric Company | Split core current transformer having an interleaved joint and hinge structure |
US4983932A (en) * | 1988-09-26 | 1991-01-08 | Kitagawa Industries Co., Ltd. | Electric noise absorber |
EP0961124A2 (en) * | 1998-05-28 | 1999-12-01 | Matsushita Electric Industrial Co., Ltd. | Multicircuit type instrument and split type current transformer for measuring various electric power quantities |
US6144277A (en) * | 1989-05-29 | 2000-11-07 | Matsui; Kazuhiro | Electric noise absorber |
US20060006976A1 (en) * | 2004-07-07 | 2006-01-12 | Veris Industries, Llc | Split core sensing transformer |
US7855655B2 (en) | 2007-09-10 | 2010-12-21 | Veris Industries, Llc | Current switch with automatic calibration |
US7902992B2 (en) | 2007-09-10 | 2011-03-08 | Veris Industries, Llc | Status indicator |
US8212548B2 (en) | 2008-06-02 | 2012-07-03 | Veris Industries, Llc | Branch meter with configurable sensor strip arrangement |
US8421443B2 (en) | 2008-11-21 | 2013-04-16 | Veris Industries, Llc | Branch current monitor with calibration |
US8421639B2 (en) | 2008-11-21 | 2013-04-16 | Veris Industries, Llc | Branch current monitor with an alarm |
US8692540B2 (en) | 2007-09-10 | 2014-04-08 | Veris Industries, Llc | Split core status indicator |
US9146264B2 (en) | 2011-02-25 | 2015-09-29 | Veris Industries, Llc | Current meter with on board memory |
US9250308B2 (en) | 2011-06-03 | 2016-02-02 | Veris Industries, Llc | Simplified energy meter configuration |
US9329996B2 (en) | 2011-04-27 | 2016-05-03 | Veris Industries, Llc | Branch circuit monitor with paging register |
US9335352B2 (en) | 2009-03-13 | 2016-05-10 | Veris Industries, Llc | Branch circuit monitor power measurement |
US9410552B2 (en) | 2011-10-05 | 2016-08-09 | Veris Industries, Llc | Current switch with automatic calibration |
US9424975B2 (en) | 2013-08-23 | 2016-08-23 | Veris Industries, Llc | Split core transformer with self-aligning cores |
US9588148B2 (en) | 2014-01-23 | 2017-03-07 | Veris Industries, Llc | Input circuit for current transformer |
US9607749B2 (en) | 2014-01-23 | 2017-03-28 | Veris Industries, Llc | Split core current transformer |
US10006948B2 (en) | 2011-02-25 | 2018-06-26 | Veris Industries, Llc | Current meter with voltage awareness |
US10274572B2 (en) | 2015-12-28 | 2019-04-30 | Veris Industries, Llc | Calibration system for a power meter |
US10371730B2 (en) | 2015-12-28 | 2019-08-06 | Veris Industries, Llc | Branch current monitor with client level access |
US10371721B2 (en) | 2015-12-28 | 2019-08-06 | Veris Industries, Llc | Configuration system for a power meter |
US10408911B2 (en) | 2015-12-28 | 2019-09-10 | Veris Industries, Llc | Network configurable system for a power meter |
US10705126B2 (en) | 2017-05-19 | 2020-07-07 | Veris Industries, Llc | Energy metering with temperature monitoring |
US10984940B2 (en) * | 2018-12-10 | 2021-04-20 | Schweitzer Engineering Laboratories, Inc. | Compression housing for a laminate core of an inductive current transformer |
US11193958B2 (en) | 2017-03-03 | 2021-12-07 | Veris Industries, Llc | Non-contact voltage sensor |
US11215650B2 (en) | 2017-02-28 | 2022-01-04 | Veris Industries, Llc | Phase aligned branch energy meter |
-
1930
- 1930-06-20 US US462681A patent/US1830541A/en not_active Expired - Lifetime
Cited By (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2447366A (en) * | 1943-09-01 | 1948-08-17 | Bendix Aviat Corp | Coil and mounting therefor |
US2452901A (en) * | 1944-08-16 | 1948-11-02 | Gen Electric | Electromagnetic induction apparatus |
US2431189A (en) * | 1946-03-28 | 1947-11-18 | Gen Electric | Electromagnetic induction apparatus |
US2494206A (en) * | 1946-04-23 | 1950-01-10 | Wayne M Ross | Electrical measuring instrument |
US2677078A (en) * | 1947-09-30 | 1954-04-27 | Bendix Aviat Corp | Electrical apparatus |
US2779927A (en) * | 1951-05-24 | 1957-01-29 | Gen Electric Co Ltd | A. c. electrical measuring instruments |
DE976371C (en) * | 1954-11-17 | 1963-07-25 | Licentia Gmbh | Current transformer |
US2789268A (en) * | 1955-09-27 | 1957-04-16 | Baltimore Gas And Electric Com | Method and apparatus for identifying electric conductors |
US3253215A (en) * | 1959-09-30 | 1966-05-24 | Automatic Switch Co | Overload current detecting device having laminated split core means coupled to a holding circuit with indicator |
US3725832A (en) * | 1971-10-12 | 1973-04-03 | Schwertzer E Mfg Co Inc | Magnetic core structure |
US4048605A (en) * | 1976-04-05 | 1977-09-13 | Sangamo Electric Company | Split core current transformer having an interleaved joint and hinge structure |
US4983932A (en) * | 1988-09-26 | 1991-01-08 | Kitagawa Industries Co., Ltd. | Electric noise absorber |
US6144277A (en) * | 1989-05-29 | 2000-11-07 | Matsui; Kazuhiro | Electric noise absorber |
EP0961124A2 (en) * | 1998-05-28 | 1999-12-01 | Matsushita Electric Industrial Co., Ltd. | Multicircuit type instrument and split type current transformer for measuring various electric power quantities |
EP0961124A3 (en) * | 1998-05-28 | 2003-07-02 | Matsushita Electric Industrial Co., Ltd. | Multicircuit type instrument and split type current transformer for measuring various electric power quantities |
US20060006976A1 (en) * | 2004-07-07 | 2006-01-12 | Veris Industries, Llc | Split core sensing transformer |
US7312686B2 (en) * | 2004-07-07 | 2007-12-25 | Veris Industries, Llc | Split core sensing transformer |
US7855655B2 (en) | 2007-09-10 | 2010-12-21 | Veris Industries, Llc | Current switch with automatic calibration |
US7902992B2 (en) | 2007-09-10 | 2011-03-08 | Veris Industries, Llc | Status indicator |
US8692540B2 (en) | 2007-09-10 | 2014-04-08 | Veris Industries, Llc | Split core status indicator |
US8212548B2 (en) | 2008-06-02 | 2012-07-03 | Veris Industries, Llc | Branch meter with configurable sensor strip arrangement |
US8421443B2 (en) | 2008-11-21 | 2013-04-16 | Veris Industries, Llc | Branch current monitor with calibration |
US8421639B2 (en) | 2008-11-21 | 2013-04-16 | Veris Industries, Llc | Branch current monitor with an alarm |
US9335352B2 (en) | 2009-03-13 | 2016-05-10 | Veris Industries, Llc | Branch circuit monitor power measurement |
US9146264B2 (en) | 2011-02-25 | 2015-09-29 | Veris Industries, Llc | Current meter with on board memory |
US10006948B2 (en) | 2011-02-25 | 2018-06-26 | Veris Industries, Llc | Current meter with voltage awareness |
US9329996B2 (en) | 2011-04-27 | 2016-05-03 | Veris Industries, Llc | Branch circuit monitor with paging register |
US9250308B2 (en) | 2011-06-03 | 2016-02-02 | Veris Industries, Llc | Simplified energy meter configuration |
US9410552B2 (en) | 2011-10-05 | 2016-08-09 | Veris Industries, Llc | Current switch with automatic calibration |
US9424975B2 (en) | 2013-08-23 | 2016-08-23 | Veris Industries, Llc | Split core transformer with self-aligning cores |
US9607749B2 (en) | 2014-01-23 | 2017-03-28 | Veris Industries, Llc | Split core current transformer |
US9588148B2 (en) | 2014-01-23 | 2017-03-07 | Veris Industries, Llc | Input circuit for current transformer |
US10274572B2 (en) | 2015-12-28 | 2019-04-30 | Veris Industries, Llc | Calibration system for a power meter |
US10371730B2 (en) | 2015-12-28 | 2019-08-06 | Veris Industries, Llc | Branch current monitor with client level access |
US10371721B2 (en) | 2015-12-28 | 2019-08-06 | Veris Industries, Llc | Configuration system for a power meter |
US10408911B2 (en) | 2015-12-28 | 2019-09-10 | Veris Industries, Llc | Network configurable system for a power meter |
US11215650B2 (en) | 2017-02-28 | 2022-01-04 | Veris Industries, Llc | Phase aligned branch energy meter |
US11193958B2 (en) | 2017-03-03 | 2021-12-07 | Veris Industries, Llc | Non-contact voltage sensor |
US10705126B2 (en) | 2017-05-19 | 2020-07-07 | Veris Industries, Llc | Energy metering with temperature monitoring |
US11085955B2 (en) | 2017-05-19 | 2021-08-10 | Veris Industries, Llc | Energy metering system with temperature monitoring based on circuit breakers of power panel likely to trip |
US10984940B2 (en) * | 2018-12-10 | 2021-04-20 | Schweitzer Engineering Laboratories, Inc. | Compression housing for a laminate core of an inductive current transformer |
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