Dielectric fluids having reduced streamer speed
AssigneeABB Research Ltd.
InventorsMikael Unge, Santanu Singha, Oystein Hestad, Stian Ingebrigtsen, Hans-Sverre Smalo, Per-Olof Astrand, Lars Lundgaard, Dag Linhjell
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Abstract
The present invention relates to a liquid composition for electrical insulation including a dielectric fluid and an additive, the additive being dissolved in the dielectric fluid and having a 1st excitation energy which is lower than the 1st excitation energy of the dielectric fluid.
Claims10
An apparatus selected from the group consisting of electrical apparatuses and power applications, comprising a liquid electrically insulating composition comprising a dielectric fluid and an additive in a concentration of between 1 and 10 wt % of the composition,
- wherein the additive is dissolved in the dielectric fluid and has a 1st electron excitation energy within the range of from 1 to 4 eV which is lower than the 1st electron excitation energy of the dielectric fluid.
An apparatus selected from the group consisting of electrical apparatuses and power applications, comprising a liquid electrically insulating composition comprising a dielectric fluid and an additive in a concentration of between 1 and 10 wt % of the composition,
- wherein the additive is dissolved in the dielectric fluid and has a 1st electron excitation energy within the range of from 1 to 4 eV which is lower than the 1st electron excitation energy of the dielectric fluid, and
- wherein the additive is selected from formula (II), (III) and (IV),
- wherein
- X is selected from S, O and N;
- and
- R1, R2, R3, and R4, are each independently selected from H, C1-10 alkyl, CH═CH2, halogens, OH, C1-10 alkoxy, OCH—C1-10 alkyl, CN, and NH2.
An apparatus selected from the group consisting of electrical apparatuses and power applications, comprising a liquid electrically insulating composition comprising a dielectric fluid and an additive in a concentration of between 1 and 10 wt % of the composition,
- wherein the additive is dissolved in the dielectric fluid and has a 1st electron excitation energy within the range of from 1 to 4 eV which is lower than the 1st electron excitation energy of the dielectric fluid, and
- wherein the additive is of the following formula (V)
- wherein X1, X2, Y1 and Y2 are each independently selected from H, C1-10 alkyl, C2-10 alkenyl, C2-10 alkynyl, OH, CHO, C1-10 acyl, C1-10 alkoxy, C1-6 alkanoyloxy, C1-10 alkylthio, C1-10 alkylamino, CN, nitro, amino, amido, sulfonyl, arylsulfonyl, halo, halo C1-10 alkyl, C1-10 alkyl aryl, and aminoaryl.
An apparatus selected from the group consisting of electrical apparatuses and power applications, comprising a liquid electrically insulating composition comprising a dielectric fluid and an additive in a concentration of between 1 and 10 wt % of the composition,
- wherein the additive is dissolved in the dielectric fluid and has a 1st electron excitation energy within the range of from 1 to 4 eV which is lower than the 1st electron excitation energy of the dielectric fluid, and
- wherein the additive is selected from 4-anilino-4′-nitroazobenzene and p-dimethylamino-azobenzenesulfonic acid.
Dependencies are inferred from the claim text.