Dielectric fluids having reduced streamer speed

Patent metadata

Field	Value
Publication number	US-10109388-B2
Application number	US-201314094253-A
Country	US
Kind code	B2
Filing date	Dec 2, 2013
Priority date	Jun 1, 2011
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

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 1 st excitation energy which is lower than the 1 st excitation energy of the dielectric fluid.

First claim

The invention claimed is:

1. 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 1 st electron excitation energy within the range of from 1 to 4 eV which is lower than the 1 st electron excitation energy of the dielectric fluid.

2. The apparatus of claim 1 , wherein the additive is selected from azo compounds, of formula (I):
R 5 —N═N—R 6   (I)

wherein R 5 and R 6 are both independently selected from aryl or heteroaryl, which is unsubstituted or substituted in one, two or three positions with substituents independently selected from C 1-10 alkyl, C 2-10 alkynyl, OH, CHO, C 1-10 acyl, C 1-10 alkoxy, C 1-6 alkanoyloxy, C 1-10 alkylthio, C 1-10 alkylamino, CN, nitro, amino, amido, sulfonyl, arylsulfonyl, halo, halo C 1-10 alkyl, C 1-10 alkyl aryl, and aminoaryl; or
a five-membered carbocyclic or heterocyclic ring, which is unsubstituted or substituted in one, two or three positions with substituents independently selected from C 1-10 alkyl, C 2-10 alkynyl, OH, CHO, C 1-10 acyl, C 1-10 alkoxy, C 1-6 alkanoyloxy, C 1-10 alkylthio, C 1-10 alkylamino, CN, nitro, amino, arylamino, amido, sulfonyl, arylsulfonyl, halo, halo-C 1-10 alkyl C 1-10 alkyl aryl, and aminoaryl.

3. The apparatus of claim 1 , wherein the dielectric fluid is an ester-based dielectric fluid.

4. The apparatus of claim 1 , wherein the additive is selected from the group consisting of colour dyes.

5. The apparatus of claim 2 , wherein
R 5 is selected from phenyl, 2-oxazolyl, 2-thiazolyl and 2-imidazolyl; and
R 6 is selected from phenyl and 2-thiazolyl.

6. 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 1 st electron excitation energy within the range of from 1 to 4 eV which is lower than the 1 st 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
R 1 , R 2 , R 3 , and R 4 , are each independently selected from H, C 1-10 alkyl, CH═CH 2 , halogens, OH, C 1-10 alkoxy, OCH—C 1-10 alkyl, CN, and NH 2 .

7. The apparatus of claim 6 , wherein
X is selected from S and O;
R 1 is selected from H, C 1-4 alkyl, OH, C 1-4 alkoxy, CN, and NH 2 ;
R 2 is selected from H or CN;
R 3 is selected from H, CHO, CH═CH 2 ; and
R 4 is selected from H and Cl.

8. The apparatus of claim 7 , wherein
R 1 is selected from H, CN, CH 3 , OH, OCH 3 , and NH 2 .

9. 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 1 st electron excitation energy within the range of from 1 to 4 eV which is lower than the 1 st electron excitation energy of the dielectric fluid, and
wherein the additive is of the following formula (V)

wherein X 1 , X 2 , Y 1 and Y 2 are each independently selected from H, C 1-10 alkyl, C 2-10 alkenyl, C 2-10 alkynyl, OH, CHO, C 1-10 acyl, C 1-10 alkoxy, C 1-6 alkanoyloxy, C 1-10 alkylthio, C 1-10 alkylamino, CN, nitro, amino, amido, sulfonyl, arylsulfonyl, halo, halo C 1-10 alkyl, C 1-10 alkyl aryl, and aminoaryl.

10. 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 1 st electron excitation energy within the range of from 1 to 4 eV which is lower than the 1 st electron excitation energy of the dielectric fluid, and
wherein the additive is selected from 4-anilino-4′-nitroazobenzene and p-dimethylamino-azobenzenesulfonic acid.

Assignees

• Abb Research Ltd

Inventors

• Unge Mikael
• Singha Santanu
• Hestad Oystein
• Ingebrigtsen Stian
• Smalo Hans-Sverre
• Astrand Per-Olof
• Lundgaard Lars
• Linhjell Dag

Classifications

• C10N2040/16

  Dielectric; Insulating oil {or insulators} · CPC title

• H01B3/20 Primary

  liquids, e.g. oils (silicone oils H01B3/46) · CPC title

• C10M169/04

  Mixtures of base-materials and additives · CPC title

• C10M133/28 Primary

  Azo compounds · CPC title

• C10M2207/2805

  used as base material · CPC title