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Three Phase Ferroresonant Transformer Having a Single Magnetic Structure Utilizing a Scott T Connection

IP.com Disclosure Number: IPCOM000079696D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Kuba, RE: AUTHOR

Abstract

A 3-phase ferroresonant transformer having a single magnetic core is composed of standard E-I laminations 10, 12. Two pairs of magnetic shunts 14, 16 composed of I-pieces stacked up and inserted into the core window provide magnetic paths, from the outside legs 18, 20 to the center leg 22. Shunts 14 are provided with air gaps 24, 26, and a nonmagnetic spacer 28 separates 10 from 12.

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Three Phase Ferroresonant Transformer Having a Single Magnetic Structure Utilizing a Scott T Connection

A 3-phase ferroresonant transformer having a single magnetic core is composed of standard E-I laminations 10, 12. Two pairs of magnetic shunts 14, 16 composed of I-pieces stacked up and inserted into the core window provide magnetic paths, from the outside legs 18, 20 to the center leg 22. Shunts 14 are provided with air gaps 24, 26, and a nonmagnetic spacer 28 separates 10 from
12.

The two primary windings 30, 32 are connected into a 3-phase to 2-phase Scott-T-connection, as indicated by the phase diagram 34, so that the magnetic fluxes set up in legs 18 and 20 have a 9 degree phase relationship. The magnetic flux in leg 22 will have a magnitude of 1.414 times the magnitude of the flux in leg 18, if the flux in leg 20 has a magnitude equal to the flux magnitude in leg 18.

Resonant capacitor windings 36, 38 are provided on legs 18 and 2O. Two output windings 4O, 42 are provided, one on leg 18 and another on leg 2O. The voltages appearing across 40 and 42 will be sinusoidal regulated with regard to input voltage changes. The output connection shown is the Scott 2-phase to 3-phase connection.

The turns ratios of the windings N1, N2, N3, N4, N5 and N6 can be chosen as desired, but windings 32 and 42 should have the square root of 3 relationship indicated. Advantages of this scheme include the following:

1) Only one magnetic core structure is required.

2) Only two...