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Detection method of dibenzyl disulfide and antioxidant in insulating oil

A technology of dibenzyl disulfide and a detection method, which is applied in the field of analysis and detection, can solve the problems affecting the safe and stable operation of transformers, insulation breakdown, and decrease in insulation performance of transformers, achieves good quantitative detection effect, improves detection efficiency and saves money The effect of human and material resources

Active Publication Date: 2015-07-29
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

Corrosive sulfur mainly includes elemental sulfur, hydrogen sulfide, mercaptan and some small molecule sulfides, which react with copper metal to form light blue and dark gray deposits - cuprous sulfide, which is a semiconductive Substances penetrate into the oil-paper insulation system and cause insulation breakdown, which reduces the insulation performance of the transformer and greatly affects the safe and stable operation of the transformer.

Method used

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  • Detection method of dibenzyl disulfide and antioxidant in insulating oil
  • Detection method of dibenzyl disulfide and antioxidant in insulating oil
  • Detection method of dibenzyl disulfide and antioxidant in insulating oil

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Embodiment Construction

[0030] The present application will be further elaborated below by way of examples.

[0031] 1.1 Instruments and equipment

[0032] Gas chromatograph: Agilent 7890A; chromatographic column, 30m×0.25mm×0.1μm 5% phenylpolysiloxane and 95% methylpolysiloxane stationary phase; electron capture detector; Agilent chromatography workstation; analytical balance, Accurate to 0.001g.

[0033] 1.2 Reagents

[0034] Nynas NytroLibra blank oil (transformer blank oil), does not contain the substance to be tested; dibenzyl disulfide (DBDS), analytically pure; isooctane, analytically pure; diphenyl disulfide (DPDS), analytically pure; 2 , 6-di-tert-butyl-p-cresol (T501), analytically pure.

[0035] 1.3 Test process

[0036] 1.3.1 Standard solution preparation

[0037] Accurately weigh the DBDS and T501 solids with an analytical balance, and use Nynas NytroLibra blank oil as a solvent to prepare a stock solution with a DBDS content of 1000 mg / kg and a T501 content of 10000 mg / kg. Continu...

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Abstract

The invention discloses a detection method of corrosive sulfur and an antioxidant in insulating oil. The detection method adopts gas chromatography detection, and comprises the following steps of (1) standard solution preparation, (2) sample pretreatment and (3) determination. The method for accurately and quantitatively determining dibenzyl disulfide (DBDS) in the insulating oil via a gas chromatography-electron capture detector (GC-ECD) is established, and the GC-ECD method has a good quantitative detection effect on 2,6-di-tert-butyl-4-methylphenol (T501) in the insulating oil. The method can simultaneously determine DBDS and T501 in the insulating oil via one sample injection.

Description

technical field [0001] The invention relates to the technical field of analysis and detection, in particular to a method for detecting corrosive sulfur and antioxidants in insulating oil. Background technique [0002] In recent years, there have been many transformer failures at home and abroad caused by corrosive sulfur in insulating oil, which have caused great harm to the safe operation of the power grid. Corrosive sulfur refers to the sulfur element or unstable sulfide of metal sulfides that can react with metals under certain conditions, and they are highly corrosive to metals. Corrosive sulfur mainly includes elemental sulfur, hydrogen sulfide, mercaptan and some small molecule sulfides, which react with copper metal to form light blue and dark gray deposits - cuprous sulfide, which is a semiconductive Substances penetrate into the oil-paper insulation system and cause insulation breakdown, which reduces the insulation performance of the transformer and greatly affect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 钱艺华曾淑芳赵耀洪曹顺安苏伟何晓辉张丽卢国华付强范圣平
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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