INTERLEAVED WINDING FOR ELECTRICAL INDUCTIVE APPARATUS

• US 3,781,739 A
• Filed: 03/28/1973
• Issued: 12/25/1973
• Est. Priority Date: 03/28/1973
• Status: Expired due to Term

• Current Assignee: ABB Power T&D Co Inc (ABB Limited)
• Original Assignee: Lloyd E. Meyer
• Inventors: Meyer, Lloyd E.
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US05/345,813
• Time in Patent Office: 272 Days
• Field of Search: 336/69,70,186,187 29/605
• US Class Current: 336/70
• CPC Class Codes: H01F 27/343 Preventing or reducing surge voltages; oscillations
• CPC Class Codes: Y10S 174/24 in an inductive device, e.g. reactor, electromagnet
• CPC Class Codes: Y10T 29/49071 by winding or coiling

Abstract

A transformer winding with coil disc sections having an odd number of conductor-turns per section. During construction, one section is wound with a pair of conductors to provide one less conductor-turn that is desired in that section. Another section is similarly wound with the same pair of conductors to provide one less conductor-turn than is desired. One of the conductors is then crossed-over to the previously wound section so that one conductor may be wound around each section for one additional turn. A splice joint in the previously wound section connects the conductor wound thereon to the proper conductor-turn.

Claims

1. A winding for electrical inductive apparatus, comprising:

first and second electrical conductors;

at least first and second coil disc sections each disposed at different axial positions in the winding, each of said coil disc sections having a plurality of radially disposed turns of said conductors forming conductor-turns with each of said coil disc sections having an odd number of total conductor-turns, start and finish conductor-turns in said first coil disc section formed by the same conductor in that section;

start and finish conductor-turns in said second coil disc section formed by the same conductor in that section;

start-start and finish-finish connections which interconnect said coil disc sections; and

a conductor-turn connection joint which connects together the finish conductor-turn of one of said coil disc sections with the next conductor-turn of the same conductor in the same coil disc section.

2. The winding of claim 1 wherein the first and second electrical conductors are interleaved to form first and second conduction paths, respectively;

said first conduction path progressing in a first radial direction through the first coil disc section, then in a second radial direction through the second coil disc section;

said second conduction path progressing in the second radial direction through the second coil disc section, then in the first radial direction through the first coil disc section;

said first radial direction being opposite to said second radial direction.

3. A method of providing an odd number of conductor-turns in first and second interleaved coil disc sections of a transformer winding, comprising the steps of:

winding each first and second coil disc section with an even number of conductor-turns from first and second conductors disposed radially adjacent to each other;

moving the second conductor from the second to thE first coil disc section; and

winding substantially one additional turn of the second conductor around the first coil disc section and the first conductor around the second coil disc section.

4. A method of constructing an interleaved winding, comprising the steps of:

positioning a first conductor on a winding tube;

positioning a second conductor on top of the first conductor;

rotating the winding tube an even number of times to form a first coil disc section;

separating the second conductor from the first coil disc section;

breaking down and hand-winding the first coil disc section;

placing the second conductor over the first conductor and rotating the winding tube an even number of times to form a second coil disc section;

moving the second conductor to the outside of the first coil disc section;

rotating the winding tube substantially one additional turn to wind one conductor on each coil disc section;

separating the second conductor from the last conductor-turn of the first coil disc section; and

joining together the last conductor-turn of the first coil disc section and the next conductor-turn of the second conductor in the first coil disc section.