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Electrical insulation oil

An electrical insulating oil, neopentyl glycol technology, applied in the direction of organic insulators, organic liquid insulators, etc., can solve the problems of incompletely satisfactory electrical insulating oil viscosity and reduced insulating performance, and achieve sufficient electrical properties and electrical insulating properties. The effect of small reduction and good practical performance

Active Publication Date: 2012-09-05
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 aforementioned rapeseed oil ester is not completely satisfactory in terms of pouring point or viscosity at low temperature, etc. In addition, various electrical insulating oils on the market are also not satisfactory in terms of electrical characteristics, pouring point, viscosity at low temperature and biological properties. There are problems in any aspect of degradability, and there are basically no oils that fully satisfy these properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0032] Table 1

[0033] Test

[0034] The physical properties of the above-mentioned test oils were measured and practical performances were evaluated. The following methods were used for physical property measurement and performance evaluation. These results are shown in Table 2.

[0035] (1) Kinematic viscosity is measured at 0...

Embodiment 2

[0046] 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-α- as an antioxidant in the amounts shown in Table 3. Naphthylamine (PNA), benzotriazole (BTA) as an antistatic agent, bis(butylphenyl)carbodiimide (BBPC) or phenyl glycidyl ether (PGE) as a hydrolysis inhibitor.

[0047] An oxygen stability test was performed on the test oil (using the method specified in JIS C2101, 120°C, 75 hours). The results are shown in Table 3.

[0048] table 3

[0049] For testing

[0050] The results indicate that oxidation stability can be improved by adding antioxidants, antistatic agents, or hydrolysis inhibitors.

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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 is more than 60% and a fluid point is less than -30 DEG C.

Description

Technical field [0001] The invention relates to an electrical insulating oil with good electrical characteristics and biodegradability. technical background [0002] As the electrical insulating oil, various oils such as refined mineral oil, alkylbenzene, alkylnaphthalene, silicone oil, or ester oil can be used. Recently, environmental issues, especially the biodegradability of leaked insulating oil, have been emphasized, and an insulating oil composed of fatty acid esters formed by the transesterification reaction of rapeseed oil and isobutanol has been proposed (see JP 2000-90740). ), and also proposed an electrical insulating oil with trimethylolpropane and / or pentaerythritol and a specific fatty acid ester as the main component (refer to JP 2004-273291). [0003] However, pole transformers for power distribution, etc., transformers with natural circulation cooling methods without circulating pumps, etc. require the above-mentioned biodegradability and general insulation perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/20
CPCH01B3/20
Inventor 开米贵森岛欣之
Owner JAPAN ENERGY CORP
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