Method of making a repairable amorphous metal transformer joint

• US 5,083,360 A
• Filed: 09/28/1988
• Issued: 01/28/1992
• Est. Priority Date: 09/28/1988
• Status: Expired due to Fees

• Current Assignee: ABB Power T&D Limited (ABB Limited)
• Original Assignee: ABB Power T&D Limited (ABB Limited)
• Inventors: Valencic, Milan D., Sinha, Ram R. P.
• Primary Examiner(s): ECHOLS, PERCY W
• Application Number:
  US07/250,470
• Time in Patent Office: 1,217 Days
• Field of Search: 29/605, 29/606, 29/609, 336/212, 336/213, 336/216, 336/217, 336/234
• US Class Current: 29/606
• CPC Class Codes: H01F 27/25 made from strips or ribbons H01F27/26 takes precedence
• CPC Class Codes: H01F 41/0226 from amorphous ribbons
• CPC Class Codes: Y10S 174/25 Transformer
• CPC Class Codes: Y10T 29/49073 by assembling coil and core
• CPC Class Codes: Y10T 29/49078 Laminated
• CPC Class Codes: Y10T 29/49721 with disassembling
• CPC Class Codes: Y10T 29/4973 Replacing of defective part

Abstract

Disclosed is a method of making a repairable transformer having an amorphous metal core. The three uncut legs of an annealed wound amorphous metal core are covered with an adhesive material while leaving the cut leg and both adjoining radii covered, but not bonded. The core joint is opened and coils are placed over the legs that adjoin the cut leg. The core joint is closed and the edges of the joint and both adjoining radii are covered with an inner layer of porous material which is secured by an outer wrap of electrical grade steel. The resulting transformer can be easily repaired by unwrapping away the porous material that covers the cut leg and the adjoining radii, opening the core joint, replacing a defective coil or core, reclosing the core joint, and rewrapping the porous material and reclosing the outer layer of electrical grade steel.

Claims

1. In a method of making a transformer having a wound amorphous metal core with a core joint in a cut leg, an improvement that makes said transformer repairable, characterized by substantially enclosing said core joint only in porous material that prevents the escape of particles of said amorphous metal, said porous material being free of curable adhesive, and then wrapping at least a portion of said material with a layer of electrical grade steel.

2. A method of making a repairable transformer having an annealed wound amorphous metal core with a core joint in a cut leg comprising:

(A) at least partially covering uncut legs of said core with a substrate impregnated with a curable adhesive;

(B) curing said adhesive, whereby said adhesive bonds to said uncut legs;

(C) opening said core joint;

(D) placing at least one coil over at least one leg that adjoins said cut leg;

(E) closing said core joint;

(F) wrapping sides of said cut leg and both of adjoining radii only with a porous material;

said porous material being free of curable adhesive; and

then

(G) at least partially wrapping said porous material and said core with an outer layer.

3. A method according to claim 2 wherein said porous material is cotton cloth.

4. A method according to claim 2 wherein said outer layer is electrical grade steel.

5. A method according to claim 2 wherein said core is rectangular, has a rectangular cross-section, and a coil is placed over each leg that adjoins said cut leg.