Electrical apparatus with dielectric fluid blend of polyalphaolefins and polyol esters or triglycerides

An electrical apparatus comprising:

• an enclosure;
• a core and coil assembly in the enclosure;
• and
• a dielectric coolant surrounding the core and coil assembly, wherein the coolant consists essentially of a polyalphaolefin and a polyol ester, said polyalphaolefin being selected from the group consisting of oligomers of C6, C8, C10 and C12 alphaolefins.

A method of filling a transformer with a coolant, wherein the transformer comprises a chamber enclosing a core and coil assembly, the method comprising:

• drying the chamber;
• and
• filling the chamber with a dielectric coolant fluid comprising a mixture of:
• a polyalphaolefin;
• and
• one of a polyol ester and a triglyceride.

An electrical apparatus comprising:

• a chamber;
• a conductor in the chamber;
• and
• a dielectric coolant surrounding the conductor, wherein the coolant consists essentially of a polyalphaolefin with a triglyceride, said polyalphaolefin being selected from the group consisting of oligomers of C6, C8, C10 and C12 alphaolefins.

An electrical apparatus comprising:

• a chamber;
• a conductor in the chamber;
• and
• a dielectric coolant surrounding the conductor, wherein the coolant comprises a mixture of a polyalphaolefin with a triglyceride, said polyalphaolefin being selected from the group consisting of oligomers of C6, C8, C10 and C12 alphaolefins.

An electrical apparatus comprising:

• a chamber;
• a conductor in the chamber;
• and
• a dielectric coolant surrounding the conductor, wherein the dielectric coolant consists essentially of:
• about 1 to about 60 weight percent alphaolefin oligomers with carbon chain lengths of C6 to C12 and
• about 40 to about 99 weight percent of a compound selected from the group consisting of:
• (a) polyols esterified with linear or branched alkyl groups with chain lengths of C5 to C20, and
• (b) triglycerides.

A method of filling a transformer with a coolant, wherein the transformer comprises a chamber enclosing a core and coil assembly, the method comprising:

• drying the chamber;
• and
• filling the chamber with a dielectric coolant consisting essentially of:
• a polyalphaolefin;
• and
• one of a polyol ester and a triglyceride.