US3678429A - H.v. testing transformer winding arrangement - Google Patents

H.v. testing transformer winding arrangement Download PDF

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Publication number
US3678429A
US3678429A US104953A US3678429DA US3678429A US 3678429 A US3678429 A US 3678429A US 104953 A US104953 A US 104953A US 3678429D A US3678429D A US 3678429DA US 3678429 A US3678429 A US 3678429A
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Prior art keywords
winding
voltage
low
wound
limbs
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Expired - Lifetime
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US104953A
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English (en)
Inventor
Frank Anthony James Collin
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Ferranti International PLC
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Ferranti PLC
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    • 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
    • H01F38/18—Rotary transformers

Definitions

  • a high-voltage transformer for producing test voltages has a low-voltage primary winding, a high-voltage secondary winding, and a cascade winding.
  • the primary winding is formed by two separate low-voltage windings wound on separate limbs of a ferromagnetic core and connected in parallel so that their magnetic fluxes assist in the wound core limbs.
  • the high-voltage secondary winding is wound over one only of the low-voltage windings.
  • the cascade winding is formed by two separate low-voltage windings connected in parallel and in phase, one being wound over the high-voltage winding on one limb and the other being wound over the low-voltage winding on the other limb.
  • each transformer except that at the highest voltage is provided with a low-voltage cascade winding which is used to supply the primary winding of the next transformer in sequence.
  • the usual winding arrangement for a high-voltage testing transformer having a cascade winding involves winding the low-voltage primary winding around one limb of the transformer core. Over this, suitably insulated, is wound the highvoltage secondary winding. The end of this winding adjacent to the primary winding is connected to the transformer tank whilst the high-voltage end of the winding is taken out through a bushing. Over the high-voltage winding is wound the lowvoltage cascade winding, one end of which is brought out so that it may be connected to the primary winding of a further transformer, and the other end of which is connected to the high-voltage terminal.
  • the high-voltage terminal of the first transformer is connected to the tank of the second transformer, which is insulated from the ground against the output of the first transformer.
  • the low-voltage primary winding of the second transformer is connected between the end of the cascade winding and the tank of the second transformer. If a third is also to be used then the second transformer will also have a cascade winding connected in the same way. The last transformer in the sequence does not require a cascade windmg.
  • Such a winding arrangement has the disadvantage that any capacitive load which may have to be supplied by two or more such transformers connected in series would be limited owing to the high impedance arising from the reactance between the low-voltage input to the first transformer and the cascade winding of the transformer. This impedance increases as the number of series-connected transformers increases.
  • a transformer which includes a ferromagnetic core having at least two limbs, a separate low-voltage primary winding wound around two of said limbs, the two windings being connected in parallel with one another such that the magnetic flux produced in the wound limbs by one winding assists the flux produced in the wound limbs by the other winding, a highvoltage winding wound over the low-voltage winding on one only of the wound limbs, a first cascade winding wound over the high-voltage winding on said one limb and a second cascade winding wound over the low-voltage winding on the other wound limb, the two cascade windings being connected in parallel and in phase with one another.
  • FIG. 1 is a schematic sectional view of a winding arrangement in accordance with the invention.
  • FIG. 2 is an equivalent circuit diagram of the winding arrangement of FIG. 1.
  • the core 10 (FIG. 1) of the transformer has two limbs 11 and 12, each of which carries a low-voltage winding 13 and 13 respectively.
  • the two low-voltage windings are connected in parallel with one another such that the magnetic flux produced by one winding in the two wound limbs assists the flux produced by the other winding in the two limbs, and leads are brought out of the tank for connection to the low-voltage supply.
  • the high-voltage winding 14 Over the low-voltage windings 13 on limb 11, is wound the high-voltage winding 14. The end of this winding adjacent to the low-voltage winding 13 is connected to the transformer tank, and the other end of the highvoltage winding is brought out through an insulating bushing.
  • the cascade winding is wound in two parts, one of which, 15, is wound over the high-voltage winding 14 on limb ll of the core.
  • the other part 15' of the cascade winding is wound over the low-voltage winding 13 on limb 12 of the core, suitably insulated from the low-voltage winding, since one end of the cascade winding is connected to the high-voltage end of the high-voltage winding 14.
  • the two parts of the cascade winding are connected in parallel and in phase with one another, and the end not connected to the high-voltage winding is brought out of the tank.
  • the core of the transformer may have more than two limbs if required, the other limbs not carrying windings.
  • FIG. 2 shows the equivalent circuit of the transformer described above.
  • Each winding is represented by an impedance given the winding reference from FIG. 1.
  • the magnetizing impedance of the primary of a transformer of this type is assumed to be very high and is therefore not shown in the equivalent circuit.
  • the high voltage output terminal is given the reference H and that of the cascade winding is C.
  • the two primary winding impedances Z and Z are shown connected in parallel with one another, as is actually the case. Since the high-voltage winding 14 is physically wound over one primary winding 13, its impedance 2, is shown in series with the primary impedance 2, The cascade winding 15 which is wound over the high-voltage winding 14 has its impedance Z connected to the junction between Z and Z to form a star network, as is usual with three-winding transformer equivalent circuits. The other cascade winding 15' is wound over the primary winding 13', and hence its impedance Z 1 is effectively in series with the impedance Z The other ends of the two cascade winding impedances Z and Z W are shown connected together to the terminal C as is the case in practice.
  • a transformer which includes a ferromagnetic core having at least two limbs, a separate low-voltage primary winding wound around two of said limbs, the two windings being connected in parallel with one another such that the magnetic flux produced in the wound limbs by one winding assists the flux produced in the wound limbs by the other winding, a highvoltage winding wound over the low-voltage winding on one only of the wound limbs, a first cascade winding wound over the high-voltage winding on said one limb and a second cascade winding wound over the low-voltage winding on the other wound limb, the two cascade windings being connected in parallel and in phase with one another.
  • a high-voltage transformer for producing test voltages comprising a ferromagnetic core having at least two limbs, a
  • each low voltage winding forming the primary winding is adjacent the limb, said low voltage primary windings and associated secondary and cascade windings being coaxially disposed on said limbs.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
US104953A 1970-01-08 1971-01-08 H.v. testing transformer winding arrangement Expired - Lifetime US3678429A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB901/70A GB1271635A (en) 1970-01-08 1970-01-08 Improvements relating to transformers

Publications (1)

Publication Number Publication Date
US3678429A true US3678429A (en) 1972-07-18

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ID=9712474

Family Applications (1)

Application Number Title Priority Date Filing Date
US104953A Expired - Lifetime US3678429A (en) 1970-01-08 1971-01-08 H.v. testing transformer winding arrangement

Country Status (7)

Country Link
US (1) US3678429A (xx)
CH (1) CH512814A (xx)
DE (1) DE2063148A1 (xx)
FR (1) FR2075984B1 (xx)
GB (1) GB1271635A (xx)
NL (1) NL7100078A (xx)
SE (1) SE360209B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060783A (en) * 1973-11-02 1977-11-29 General Electric Co. Magnetic circuit and method of making
US4466051A (en) * 1982-10-25 1984-08-14 Rca Corporation Regulated power supply incorporating a power transformer having a tightly coupled supplemental power transfer winding
US5455506A (en) * 1994-07-21 1995-10-03 Copek Electro Ltee Method and portable testing apparatus for safely testing an autotransformer for power distribution lines
WO2010095955A1 (en) 2009-02-23 2010-08-26 Badger Explorer Asa High voltage transformer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699292A (en) * 1926-08-21 1929-01-15 Firm Emil Haefely & Cie A G High-tension transformer
US1749388A (en) * 1926-11-08 1930-03-04 Bbc Brown Boveri & Cie Transformer
US1761732A (en) * 1928-01-28 1930-06-03 Gen Electric Transformer
DE1488209A1 (de) * 1964-07-31 1969-04-03 Licentia Gmbh Transformator,insbesondere Lokomotiv-Transformator
DE1488336A1 (de) * 1964-04-04 1969-05-14 Siemens Ag Hochspannungs-Prueftransformator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699292A (en) * 1926-08-21 1929-01-15 Firm Emil Haefely & Cie A G High-tension transformer
US1749388A (en) * 1926-11-08 1930-03-04 Bbc Brown Boveri & Cie Transformer
US1761732A (en) * 1928-01-28 1930-06-03 Gen Electric Transformer
DE1488336A1 (de) * 1964-04-04 1969-05-14 Siemens Ag Hochspannungs-Prueftransformator
DE1488209A1 (de) * 1964-07-31 1969-04-03 Licentia Gmbh Transformator,insbesondere Lokomotiv-Transformator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060783A (en) * 1973-11-02 1977-11-29 General Electric Co. Magnetic circuit and method of making
US4466051A (en) * 1982-10-25 1984-08-14 Rca Corporation Regulated power supply incorporating a power transformer having a tightly coupled supplemental power transfer winding
US5455506A (en) * 1994-07-21 1995-10-03 Copek Electro Ltee Method and portable testing apparatus for safely testing an autotransformer for power distribution lines
WO2010095955A1 (en) 2009-02-23 2010-08-26 Badger Explorer Asa High voltage transformer
US20120007706A1 (en) * 2009-02-23 2012-01-12 Badger Explorer Asa High Voltage Transformer
US9490065B2 (en) * 2009-02-23 2016-11-08 Zaptec Ip As High voltage transformer

Also Published As

Publication number Publication date
FR2075984A1 (xx) 1971-10-15
NL7100078A (xx) 1971-07-12
FR2075984B1 (xx) 1976-03-19
SE360209B (xx) 1973-09-17
DE2063148A1 (de) 1971-07-15
CH512814A (de) 1971-09-15
GB1271635A (en) 1972-04-19

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