Method for quantitatively detecting content of corrosive sulfur in mineral insulating oil

A technology of mineral insulating oil and corrosive sulfur, which is applied in material excitation analysis, thermal excitation analysis, etc., can solve problems such as breakdown and burning of transformer insulation layer, reduction of insulation performance of insulating paper, and corrosion of transformer copper winding, so as to shorten the reaction time , low activation energy, and the effect of ensuring safe and stable operation

Inactive Publication Date: 2014-08-06
STATE GRID CORP OF CHINA +2
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AI Technical Summary

Problems solved by technology

The mercaptans and disulfides contained in the insulating oil can cause corrosion of the copper winding of the transformer. After long-term operation, cuprous sulfide will be formed on the surface of the coil, which will reduce the insulation performance of the insulating paper. In severe cases, the insulation layer of the transformer will be broken down and burned
The currently known insulating oil corrosive sulfur test method SH / T0304-99 and the ministry-promulgated GB / T25961-2010 standard can only be used for qualitative analysis of whether corrosive sulfur is contained, and lack of quantitative detection. Therefore, it is urgent to establish a In order to effectively grasp the degree of corrosion of transformer coils by oil products, this is of great significance to the safe and stable operation of oil-immersed equipment such as transformers and reactors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take one set of inductively coupled plasma emission spectrometer, one Erlenmeyer flask, entrusted mineral insulating oil sample 150mL, silver powder 1g, filter paper, and kerosene without sulfide 100mL. The inductively coupled plasma emission spectrometer used is the ICAP6300 thermoelectric spectrometer made in the United States;

[0016] (2) Pour the entrusted mineral insulating oil sample obtained in step (1) into the conical flask obtained in step (1), and add the silver powder obtained in step (1) into the conical flask, and then place it at 150 Stir continuously in the environment of ℃ temperature, and react for 4 to 8 hours to obtain silver sulfide mixed liquid, and its reaction formula is;

[0017] Ag+RS→AgS

[0018] Where Ag is silver, RS is corrosive sulfide, and AgS is silver sulfide.

[0019] (3) Use the filter paper obtained in step (1) to filter the silver sulfide mixture obtained in step (2) for 3 times, and start the emission spectrum of the inducti...

Embodiment 2

[0024] (1) Take one set of inductively coupled plasma emission spectrometer, one Erlenmeyer flask, entrusted mineral insulating oil sample 250mL, silver powder 3g, filter paper, 100mL kerosene without sulfide. The inductively coupled plasma emission spectrometer used is the ICAP6300 thermoelectric spectrometer made in the United States;

[0025] Steps (2) to (4) are the same as in Example 1.

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Abstract

The invention discloses a method for quantitatively detecting the content of corrosive sulfur in mineral insulating oil. The method comprises the following steps: (1), preparing an inductive coupling plasma emission spectrometer, a conical flask, an entrusted mineral insulating oil sample, silver powder, filter paper, and kerosene; (2), pouring a sample in the conical flask, adding the silver powder for mixing and reacting to obtain a silver sulfide mixed solution; (3), filtering, and testing the content of the sulfur by the emission spectrum; and (4), subtracting the content of the sulphur of the sample from the content of the sulphur in a mixed solution, so that an obtained difference is the content of the corrosive sulfur in the entrusted mineral insulating oil sample. According to the method, the silver powder is mixed with sulfide in the mineral insulating oil, the content of the sulphur before and after mixing is tested so that the content of the corrosive sulphur in the oil can be obtained, so that the operation state of electric equipment such as a transformer and an electric reactor can be accurately evaluated, and the safe and stable operation of the electric equipment is ensured.

Description

technical field [0001] The invention relates to an oil detection method, in particular to a method for quantitative detection of corrosive sulfur content in mineral insulating oil. Background technique [0002] In recent years, there have been many failures of transformers and reactors caused by high levels of corrosive sulfur in mineral insulating oils. The mercaptans and disulfides contained in the insulating oil can cause corrosion of the copper winding of the transformer. After long-term operation, cuprous sulfide will be formed on the surface of the coil, which will reduce the insulation performance of the insulating paper. In severe cases, the insulation layer of the transformer will be broken down and burned . The currently known insulating oil corrosive sulfur test method SH / T0304-99 and the ministerial GB / T25961-2010 standard can only be used for qualitative analysis of whether corrosive sulfur is contained, and lack of quantitative detection. Therefore, it is urge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
Inventor 万涛冯兵何铁祥周舟常燕龚尚昆刘小玲
Owner STATE GRID CORP OF CHINA
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