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Method for judging titration end point in acidity test of sulfur hexafluoride (SF6) gas

A titration end point, SF6 technology, applied in the field of electrical equipment, can solve problems such as hidden dangers of electrical equipment, and achieve the effects of safe and reliable operation, improved precision, and safe operation

Inactive Publication Date: 2013-03-13
STATE GRID CORP OF CHINA +3
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  • Abstract
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Problems solved by technology

However, SF 6 During the production and use of gas, some impurities will be produced, which will cause safety hazards to the normal operation of electrical equipment. Therefore, the relevant standards at home and abroad are all about SF 6 There are strict regulations on the impurity content in the gas, among which acidity is one of the important indicators

Method used

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Experimental program
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Effect test

Embodiment 1

[0016] In view of the situation in the prior art that the pH value of the indicator has a wide mutation range, the present invention selects a more accurate acidity meter method to judge the end point. In order to be unified with the method in the current standard, the present invention takes the titration endpoint pH as 5.0.

[0017] First, choose a high-precision acidity meter with a resolution of 0.01PH. Secondly, according to the acidity meter manual, install and debug the acidity meter, and start it up for use. Third, insert the detection electrode of the pH meter into the solution to be titrated. Fourth, while using 0.01mol / L H 2 SO 4 (in 1 / 2 H 2 SO 4 is the basic unit) back dripping 0.01mol / L NaOH absorption solution, while observing the change of the pH meter reading, when the pH meter reading is 5.0, end the titration.

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Abstract

The invention relates to the technical field of electrical equipment, and in particular relates to a method for judging a titration end point in an acidity test of an insulating medium, namely sulfur hexafluoride (SF6) gas, of electrical equipment. The judgment method comprises the following steps of: setting the titration end point; connecting an electrode; and performing back titration and liquid absorption. The method has the beneficial effects that as the end point is judged by a more accurate acidity meter, and the pH value of the acidity meter is set to be 5.0, the test end point is easy to judge, the precision of the acidity test for the SF6 gas is improved, and thus the method has significance to guarantee of safety operation of the electrical equipment. The method provided by the invention is easy to operate, the acidity value in the SF6 gas is accurately tested, and thus the safety operation of the electrical equipment can be reliably guaranteed.

Description

technical field [0001] The invention relates to the technical field of electrical equipment, in particular to an insulating medium SF for electrical equipment. 6 Method for judging the titration end point of acidity test in gas. Background technique [0002] SF 6 Gas has excellent electrical properties. As a new generation of insulating medium, it has been widely used in high-voltage and ultra-high-voltage electrical equipment. However, SF 6 During the production and use of gas, some impurities will be produced, which will cause safety hazards to the normal operation of electrical equipment. Therefore, relevant standards at home and abroad are all about SF 6 There are strict regulations on the impurity content in the gas, among which acidity is one of the important indicators. The test method is to absorb a certain volume of SF with 0.01mol / L NaOH 6 Acidic components in the gas, and then, with 0.01mol / L H 2 SO 4 (in 1 / 2 H 2 SO 4 is the basic unit) back-drip absorpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N27/26
Inventor 路自强李玉海
Owner STATE GRID CORP OF CHINA
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