SHIELDED CONDUCTOR FOR DISK WINDINGS OF INDUCTIVE DEVICES

• US 3,820,048 A
• Filed: 06/01/1973
• Issued: 06/25/1974
• Est. Priority Date: 06/07/1972
• Status: Expired due to Term

• Current Assignee: Kazuo Ohta, Kentaro Kurita, Shigeru Morita
• Original Assignee: Kazuo Ohta, Kentaro Kurita, Shigeru Morita
• Inventors: Ohta, Kazuo, Kurita, Kentaro, Morita, Shigeru
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US05/366,146
• Time in Patent Office: 389 Days
• Field of Search: 336/69,70,84
• US Class Current: 336/70
• CPC Class Codes: H01F 27/345 using auxiliary conductors
• CPC Class Codes: H02G 15/064 with devices for relieving electrical stress
• CPC Class Codes: Y10S 174/25 Transformer
• CPC Class Codes: Y10S 174/31 having a shield or metallic layer

Abstract

A shielded conductor used with disk windings for inductive devices characterized in that the disk windings comprise a plurality of coil units of conductive material wound in disk form, the disk windings having at least several coil units nearer to its external line terminal holding therein at least a winding of the shielded conductor with its inner end open so as to maintain the shielded conductor at a predetermined potential, a member material for regulating the electric field is connected to the open inner end of the shielded conductor, and an insulating layer is covered on both the connection and the member material for regulating the electric field. The member material for regulating the electric field permits the alleviation of concentration of electric field at the open inner end of the shielded conductor thereby to prevent dielectric breakdown between the coil units and the shielded conductor.

Claims

1. In a disk winding for electrical inductive device comprising a plurality of coil units of conductive material connected in series with each other and shielded conductors with an inner end kept open, said conductive material of each of said coil unit being covered with an insulating material and wound into the shape of a disk, said shielded conductors being covered with an insulating material and wound by at least a turn in at least several coil units nearer to an external line terminal thereby to maintain a predetermined electric potential;

the improvement wherein said shielded conductors comprise a band-shaped member material for regulating electric field fixedly connected to said open inner end, an insulating material being covered on said connection and said member material for regulating electric field.

2. Shielded conductors for disk windings of inductive devices according to claim 1, in which said band-shaped member material for regulating electric field comprises a plurality of resistor sections connected to the open inner end of said shielded conductors and an insulator section.

3. Shielded conductors for disk windings of inductive devices according to claim 1, in which said member material for regulating electric field comprises a band-shaped insulating material which is covered with predetermined lengths of a low-resistance semiconductive paint and high-resistance semiconductive paint in that order from the side connected with open inner end of the shielded conductors, said band-shaped insulating material further having a predetermined length of unpainted portion, said low-resistance semiconductive paint and said high-resistance semiconductive paint being partly overlapped on each other.

4. Shielded conductors for disk windings of inductive devices according to claim 1, in which that end of said band-shaped member material which is opposed to said shielded conductors is provided with a forked portion covered with said low-resistance semiconductive paint, said forked portion holding between its prongs the open inner end of said shielded conductors, said shielded conductors being fixedly connected to said member material by means of an insulating tape.

5. Shielded conductors for disk windings of inductive devices according to claim 1, in which the open inner end of said shielded conductors is connected to said member material for regulating electric field through the interposition therebetween of a connecting tape comprising thin insulating paper painted with a low-resistance semiconductive material.

6. In a disk winding for electrical inductive devices comprising a plurality of coil units of conductive material connected in series with each other and shielded conductors with an inner end kept open, said conductive material which constitutes each of said coil unit being covered with an insulating material and wound into the shape of a disk, said shielded conductors being covered with an insulating material and wound by at least a turn in at least several coil units nearer to an external line terminal thereby to maintain a predetermined electric potential;

the improvement wherein the open inner end of said shielded conductors is connected to a member material for regulating electric field fixedly with an insulating tape through the interposition of a connecting tape comprising a thin insulating paper painted with a low-resistance semiconductive material, said member material comprising a band-shaped insulating material including a forked-portion and a predetermined length of unprocesSed portion, said forked-portion being painted with a low resistance semiconductive material and supporting the open inner end of said shielded conductors, said member material being painted partly with a predetermined length of a low-resistance semiconductive material and partly with a predetermined length of a high-resistance semiconductive material in that order from that side of said member material provided with said forked portion said low-resistance semiconductive material and said high-resistance semiconductive material being partly overlapped on each other, said connection and said member material being covered with an insulating material.