GB173606A - Improvements in electric inductance apparatus - Google Patents

Improvements in electric inductance apparatus

Info

Publication number
GB173606A
GB173606A GB28090/20A GB2809020A GB173606A GB 173606 A GB173606 A GB 173606A GB 28090/20 A GB28090/20 A GB 28090/20A GB 2809020 A GB2809020 A GB 2809020A GB 173606 A GB173606 A GB 173606A
Authority
GB
United Kingdom
Prior art keywords
winding
condenser
plates
layers
voltage
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
Application number
GB28090/20A
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority claimed from US540756XA external-priority
Application filed by General Electric Co filed Critical General Electric Co
Priority to GB28090/20A priority Critical patent/GB173606A/en
Publication of GB173606A publication Critical patent/GB173606A/en
Priority to FR540756D priority patent/FR540756A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/34Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/343Preventing or reducing surge voltages; oscillations
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/34Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36Electric or magnetic shields or screens
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/34Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36Electric or magnetic shields or screens
    • H01F27/363Electric or magnetic shields or screens made of electrically conductive material

Abstract

173,606. British Thomson - Houston. Co., Ltd., (General Electric Co.). Oct. 4, 1920. Transformers; polyphase transformers. - In order to prevent the production of excessive transient voltages within an electric winding, such as a high-voltage transformer winding or a reactance coil, means are provided for imposing electrostatically upon the winding a substantially uniform distribution of voltage, the voltage distribution due to capacity in the winding being made substantially coincident with that due to inductance. In the arrangement shown in Fig. 7, the winding comprises a number of disc coils 30 connected in series between terminals a, b, the terminal b being earthed. Condensers 32 are connected in series with each other and in parallel with the individual coils as shown, the capacities of the condensers being such as to ensure a uniform potential gradient through the winding. If the end of the winding is not earthed, the added condensers are of equal size and of sufficient capacity to neutralize the inherent capacity of the winding. In other arrangements the terminals of the winding are connected to the plates of a condenser, and the turns of the winding progress at a substantially uniform rate in the dielectric between the plates so that the potential existing at any point of the winding due to its position in the dielectric is substantially the same as the potential due to inductance. One example of this arrangement is shown in Fig. 11, in which the individual coils of the winding are of conical form connected in series between flat condenser plates 48, 49. In a modification the condenser plates are conical and the coils flat. In the arrangement shown in Fig. 13, flat disc coils 62 are wound between cylindrical condenser plates 60, 61. The plates may be of tapering form in order to permit the use of coils of the same diameter. The invention may be applied to windings formed of cylindrical layers, the crossover connections between the layers being preferably brought outside the condenser cylinders, as shown in Fig. 18. The ground capacity of these shown in Fig. 18. The ground capacity of these connections may be eliminated by arranging them between auxiliary condenser plates 90 connected to the main condenser plates. The connections between the layers may be eliminated altogether by the use of alternate inverted conical layers as shown in Fig. 22. The application of the invention to a shell-type transformer is shown in Fig. 24. The high-voltage winding of the transformer comprises a number of cylindrical layers 124 supported on insulating-cylinders 125 separated by spacing strips 126. The inner and outer cylinders are covered with layers of conducting material 127 such as tin or aluminium foil, which form the plates of the protecting condenser. The crossover connections between the various layers are carried outside the transformer through tubular bushing structures 134. A method of winding a multi-layer coil which reduces the capacity between the layers is shown in Fig. 28. The initial turns 151 - - 160 are wound in pyramid fashion until a desired depth is reached and succeeding turns are wound against the side of the pyramid in the successive grooves formed by the laying of the preceding turn. In applying the invention to a single-phase core-type transformer, Fig. 29, low-voltage windings 201 and high-voltage windings 203 protected by condenser cylinders 204, 205 are mounted on each leg 202 of the core. The terminals a, b are connected to the outer cylinders of each condenser, the inner cylinders being connected together by a conductor 206 which is preferably earthed at d. Ordinary lightning arresters L may be placed across the individual windings. The invention can also be applied to polyphase transformers.
GB28090/20A 1920-01-29 1920-10-04 Improvements in electric inductance apparatus Expired GB173606A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB28090/20A GB173606A (en) 1920-01-29 1920-10-04 Improvements in electric inductance apparatus
FR540756D FR540756A (en) 1920-01-29 1922-01-28 Improvements to electrical appliances

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US540756XA 1920-01-29 1920-01-29
GB28090/20A GB173606A (en) 1920-01-29 1920-10-04 Improvements in electric inductance apparatus

Publications (1)

Publication Number Publication Date
GB173606A true GB173606A (en) 1922-01-04

Family

ID=57046895

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28090/20A Expired GB173606A (en) 1920-01-29 1920-10-04 Improvements in electric inductance apparatus

Country Status (2)

Country Link
FR (1) FR540756A (en)
GB (1) GB173606A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE762230C (en) * 1933-03-11 1953-07-27 Siemens Schuckertwerke A G Electrostatic shielding for tubular windings of electrical transformers or choke coils made up of disc coils and subject to traveling waves
DE961010C (en) * 1942-10-08 1957-03-28 Aeg Disc coil winding for transformers with large currents

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE762230C (en) * 1933-03-11 1953-07-27 Siemens Schuckertwerke A G Electrostatic shielding for tubular windings of electrical transformers or choke coils made up of disc coils and subject to traveling waves
DE961010C (en) * 1942-10-08 1957-03-28 Aeg Disc coil winding for transformers with large currents

Also Published As

Publication number Publication date
FR540756A (en) 1922-07-18

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