HIGH VOLTAGE OIL INSULATED AND COOLED ARMATURE WINDINGS

• US 3,743,867 A
• Filed: 12/20/1971
• Issued: 07/03/1973
• Est. Priority Date: 12/20/1971
• Status: Expired due to Term

• Current Assignee: Joseph L. Smith Jr
• Original Assignee: Joseph L. Smith Jr
• Inventors: Smith, Joseph L. Jr.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/210,088
• Time in Patent Office: 561 Days
• Field of Search: 310/52,40,64,85,86,54,53,58,55
• US Class Current: 310/52
• CPC Class Codes: H02K 3/00 Details of windings
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 3/40 for high voltage, e.g. affording protection against corona discharges
• CPC Class Codes: H02K 55/04 with rotating field windings
• CPC Class Codes: H02K 9/197 in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
• CPC Class Codes: Y02E 40/60 Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Abstract

The armature of a high-voltage electrical generator or motor is contained in a chamber which also contains transformer oil or other suitable insulating and cooling fluid. The oil immerses the armature winding and provides protection against corona and flashover. The oil is also circulated through the chamber and along, across and over the armature conductors including if desired associated structure such as a magnetic shield to provide cooling of the conductors and structure. An oil pump and oil cooler external to the chamber provide a closed oil circulating system.

Claims

1. A high voltage electrical machine comprising an armature winding, a rotor within said armature winding, a liquid-tight chamber completely surrounding said armature winding but excluding said rotor, said chamber having a cylindrical configuration at least in that portion of said chamber interposed between the armature and the rotor, a fluid containeD within and filling said chamber and in contact with the armature winding, said fluid being electrically insulating and cooling fluid, means for circulating said fluid within said chamber, the fluid flow within said chamber flows over the external and/or internal regions of the armature bars of the winding including the end-turn region of the armature winding, means for cooling said fluid in a closed system, whereby the armature is cooled and insulated separately from the rotor.

2. The apparatus of claim 1 wherein said fluid is comprised of transformer oil.

3. The apparatus of claim 1 wherein the fluid in contact with the armature winding flows along, across, and over the surface of bars which comprise the armature winding.

4. The apparatus of claim 1 wherein, the armature winding is comprised of bars having a passage for the flow of fluid along and through the length of the bars which comprise the armature winding.

5. The apparatus of claim 5 wherein, said bar comprises twisted circular conductors and the passage for the flow of fluid comprises the space between the conductors.

6. The apparatus of claim 6 wherein, said circular conductors comprise twisted strands of wire having a space between the strands to provide additional passages for the flow of fluid through the armature bar.

7. The apparatus of claim 1 wherein said bar comprises, a plurality of electrical conductors, each of the same cross section, at least one tube of the same cross sectional outline, said conductors and tube being twisted around each other along their lengths to provide the conductor bar, the tube comprising the passage for the flow of fluid through and along the length of the bar.

8. The apparatus of claim 1 comprising in addition a second chamber connected to the armature chamber by at least one fluid channel, the second enclosure incorporating a flux shield to be cooled, said fluid circulating means comprising a fluid pump and a fluid cooler, each enclosure having an orifice to which the pump and cooler are serially connected to allow fluid flow through each enclosure.

9. The apparatus of claim 1 wherein said rotor comprises a cryogenically cooled winding within a cylinder containing the cryogenic fluid, and said rotor cylinder and said armature cylinder being separated by a vacuum space.

10. The apparatus of claim 4 wherein said rotor comprises a winding of superconductors and said cryogenic fluid is at a temperature at which said rotor winding is superconducting.