Renewable hydrocarbon based insulating fluid

Patent metadata

Field	Value
Publication number	US-9786408-B2
Application number	US-201414764342-A
Country	US
Kind code	B2
Filing date	Feb 20, 2014
Priority date	Feb 21, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

Electrical equipment including insulating fluid and having isoparaffins derived from a renewable carbon source, the fluid having a flash point of at least 210° C. and comprising at least 70 wt % of the isoparaffins. The electrical equipment can be installed and operated subsea.

First claim

The invention claimed is:

1. An electrically insulating fluid comprising
isoparaffins derived from a renewable carbon source in an electrical equipment, the fluid having a flash point of at least 220° C. and comprising at least 70 wt % of the isoparaffins.

2. The fluid according to claim 1 , comprising at least 90 wt % of the isoparaffins.

3. The fluid according to claim 1 , with a biodegradability of at least 65% or at least 95% according to OECD 301B.

4. The fluid according to claim 1 , wherein the isoparaffins have been derived from the renewable carbon source by means of micro organisms or algae, such as bacteria, yeast or algae.

5. The fluid according to claim 1 , wherein the isoparaffins have been derived from terpenes or unsaturated compounds obtained from the renewable carbon source.

6. The fluid according to claim 5 , wherein the isoparaffins have been derived from terpenes by means of micro organisms or algae, such as bacteria, yeast or algae.

7. The fluid according to claim 1 , wherein the renewable carbon source is biomass, such as sugar cane, molasses or cellulose pulp.

8. The fluid according to claim 1 , wherein the fluid has a pour point of less than −25° C. in accordance with ASTM D 5950.

9. The fluid according to claim 1 , wherein the fluid has a kinematic viscosity at 100° C. in the range 2 cSt to 10 cSt.

10. The fluid according to claim 1 , wherein the fluid also comprises one or more additives, such as an antioxidant or a pour point depressant.

11. The fluid according to claim 1 , wherein the electrical equipment is an electrical transformer, an electrical motor, a capacitor, a reactor or a bushing.

12. An electrical equipment having an electrically insulating fluid comprising
isoparaffins derived from a renewable carbon source, the fluid having a flash point of at least 220° C. and comprising at least 70 wt % of the isoparaffins.

13. The electrical equipment of claim 12 , wherein the electrical equipment is an electrical transformer, an electrical motor, a circuit breaker pole, a frequency converter selected from the group comprising, a capacitor, a reactor, a bushing, or a combination of these.

14. The electrical equipment of claim 12 , wherein the electrical equipment is installed and operated subsea.

15. The electrical equipment of claim 14 , wherein the electrical equipment is installed inside a housing containing the electrically insulating fluid and one or more parts of the electrical equipment are immersed in the insulating fluid.

16. The fluid according to claim 1 , wherein the electrical equipment is installed and operated subsea.

17. The fluid according to claim 1 , wherein the electrical equipment is installed inside a housing containing the electrically insulating fluid and one or more parts of the electrical equipment are immersed in the insulating fluid.

18. A transformer comprising:
a housing;
a metal core inside the housing, the metal core surrounded by windings;
the fluid according to claim 1 inside the housing, the metal core immersed in the fluid;
the transformer pressurized to a hydrostatic pressure level on a seabed.

19. The electrical equipment of claim 14 , wherein the electrical equipment is pressurized to a hydrostatic pressure level on a seabed.

Assignees

• Abb Schweiz Ag

Inventors

• Singha Santanu
• Brandes Gal
• Cherry Donald
• Claiborne Clair
• Page Stephane

Classifications

• H02K9/19

  for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil · CPC title

• H01G2/08

  Cooling arrangements; Heating arrangements; Ventilating arrangements · CPC title

• H01G4/04

  Liquid dielectrics · CPC title

• H01B17/34

  Insulators containing liquid, e.g. oil · CPC title

• H05K7/20236

  by immersion · CPC title