Renewable hydrocarbon based insulating fluid
View Patent ↗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.
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.