Electrical insulation oil

A technology for electrical insulating oil and insulation destruction, applied in the direction of organic insulators, organic liquid insulators, etc., can solve the problems of reduced insulation performance and unsatisfactory viscosity of electrical insulating oil, etc., and achieve small reduction in electrical insulation performance and full electrical insulation Good properties and biodegradability

Active Publication Date: 2007-07-04
JAPAN ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, pole-mounted transformers for power distribution, etc., and transformers with natural circulation cooling methods without circulating pumps, require the above-mentioned biodegradability and general insulation performance, and at the same time low viscosity at low temperatures or insulation performance even if some water is mixed. The reduction is also small
[0004] The electrical insulating oil composed of the aforement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Neopentyl glycol (NPG) was used as alcohol, n-heptanoic acid (nC7), n-octanoic acid (nC8), n-nonanoic acid (nC9), n-decanoic acid (nC10), 2-ethylhexanoic acid (bC8) were used as carboxylic acids ), 3,5,5-trimethylhexanoic acid (bC9), n-butyric acid (nC4), n-dodecanoic acid (nC12) and, for comparison, trimethylolpropane (TMP) or pentaerythritol (PE), prepare ester according to the ratio shown in table 1, as oil for testing. Furthermore, it is an ester prepared by chemically mixing esters of two or more carboxylic acids, that is, mixing carboxylic acids in a set ratio, and carrying out esterification reaction with alcohol.

[0032] for test

[0033]The physical properties of the above test oils were measured, and the practical performance was evaluated. Physical property measurements and performance evaluations were performed by the following methods. These results are shown in Table 2.

[0034] (1) Kinematic viscosity was measured at 0° C. by the method pres...

Embodiment 2

[0044] In the above-mentioned test oil 6, according to the total test oil quality standard, add 2,6-di-tert-butyl p-cresol (DBPC) or phenyl-alpha-cresol (DBPC) or phenyl-α- Naphthylamine (PNA), benzotriazole (BTA) as antistatic agent, bis(butylphenyl)carbodiimide (BBPC) or phenylglycidyl ether (PGE) as hydrolysis inhibitor.

[0045] An oxygen stability test (120° C., 75 hours at 120° C. for 75 hours) was carried out on the test oil. The results are shown in Table 3.

[0046] for testing

[0047] This result shows that the oxidation stability can be improved by adding an antioxidant, an antistatic agent, or a hydrolysis inhibitor.

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Abstract

An electrical insulation oil that excels in biodegradability, having low viscosity at low temperature, and that even when a quantity of moisture is mixed therein, is low in the deterioration of insulation performance, ensuring satisfactory electrical characteristics. In particular, there is provided an electrical insulation oil comprising as a main component an ester composed of neopentyl glycol and at least one C7-C10 linear or branched carboxylic acid and having a kinematic viscosity at 0 DEG C of 10 to 200 mm2/s, a dielectric breakdown voltage of = 30 kV, a biodegradability of = 60% and a fluid point of = -30 DEG C.

Description

technical field [0001] The invention relates to an electrical insulating oil with good electrical properties and biodegradability. technical background [0002] As the electrical insulating oil, various oils such as purified mineral oil, alkylbenzene, alkylnaphthalene, silicone oil, or ester oil can be used. Recently, environmental problems, especially the biodegradability of leaked insulating oil have been paid attention to, and an insulating oil composed of a fatty acid ester produced by transesterification of rapeseed oil and isobutanol has been proposed (see JP-A-2000-90740 ), have also proposed an electrical insulating oil mainly composed of an ester of trimethylolpropane and / or pentaerythritol and a specific fatty acid (refer to JP-A-2004-273291). [0003] However, pole-mounted transformers for power distribution, etc., and transformers with natural circulation cooling methods without circulating pumps, require the above-mentioned biodegradability and general insulati...

Claims

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Application Information

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IPC IPC(8): H01B3/20
CPCH01B3/20
Inventor 开米贵森岛欣之
Owner JAPAN ENERGY CORP
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