Pressboard

Patent metadata

Field	Value
Publication number	US-10351996-B2
Application number	US-201515520028-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Oct 20, 2014
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A cellulose based pressboard for insulation in an electrical power transformer, the pressboard includes polyvinylamine (PVAm), and polyacrylamide (PAM), in a combined amount of between 0.01% and 20% by weight of the pressboard.

First claim

The invention claimed is:

1. An electrical apparatus comprising a solid insulation material made from a pressboard comprising:
cationic polyvinylamine (PVAm); and
anionic polyacrylamide (PAM);
in a combined amount of between 0.01% and 20% by weight of the pressboard;
wherein the weight ratio of PVAm and PAM is between 1:1 and 2:1.

2. The electrical apparatus comprising a solid insulation material made from a pressboard of claim 1 , wherein the combined amount of PVAm and PAM in the pressboard is between 0.01 and 5 wt %.

3. The electrical apparatus comprising a solid insulation material made from a pressboard of claim 1 , wherein the amount of PVAm in the pressboard is between 0.01 and 5 wt %.

4. The electrical apparatus comprising a solid insulation material made from a pressboard of claim 1 , wherein the amount of PAM in the pressboard is between 0.01 and 5 wt %.

5. The electrical apparatus comprising a solid insulation material made from a pressboard of claim 1 , wherein a cellulose of the pressboard is from sulphite pulp.

6. The electrical apparatus comprising a solid insulation material made from a pressboard of claim 1 , wherein the pressboard is in the form of a spacer, an axial stick or a winding table.

7. The electrical apparatus of claim 1 , wherein the apparatus is a transformer comprising:
a transformer winding; and
an insulation fluid with which the transformer is filled.

8. The transformer of claim 7 , wherein the solid insulation material is in the form of a plurality of spacers integrated with the winding.

9. The transformer of claim 7 , wherein the insulation fluid is a liquid.

10. The transformer of claim 7 , wherein the transformer is a power transformer configured for high voltage operation.

11. The pressboard of claim 1 , wherein a weight ratio of PVAm to PAM is 3:2.

12. The pressboard of claim 1 , wherein the solid insulation material further comprises a sulphite pulp.

Assignees

• Abb Schweiz Ag

Inventors

• Pitois Claire
• Montibon Elson
• Sahlen Fredrik
• Schimdt Lars
• Girlanda Orlando
• Brattberg Torbjorn
• Wagberg Lars

Classifications

• H01F27/00

  Details of transformers or inductances, in general · CPC title

• D21H17/36 Primary

  Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters · CPC title

• D21J1/20

  Insulating board · CPC title

• D21H17/56

  Polyamines; Polyimines; Polyester-imides · CPC title

• H01F27/32

  Insulating of coils, windings, or parts thereof · CPC title