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Concurrent measuring method for multiple metallic elements in transformer oil

A technology for transformer oil and metal elements, which is used in the preparation of test samples, material excitation analysis, etc., can solve problems such as low efficiency, affecting the safe operation of power grids, and no national standards for metal elements in transformer oil.

Active Publication Date: 2008-07-16
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, failures and accidents caused by the excessive presence of metal elements in transformer oil continue to occur, but there are neither national standards nor industry standards for the determination of metal elements in transformer oil. This is a serious problem that needs to be solved urgently
[0004] The first is that in recent years, there have been many major power equipment failures caused by the excessive presence of metal elements in transformer oil; the second is that there is no standard method for metal elements in transformer oil, which leads to high cost and low efficiency of fault treatment, which directly affects safe operation of the power grid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Put the collected representative oil medium into a constant temperature oven, heat it at 50-60°C for 15-20min, take it out and shake it well. Accurately weigh 10.000g or 20.000g (determined according to the size of the impurity content to ensure that the ashing amount of the sample is appropriate) in a 50ml quartz beaker, place it on a ceramic infrared heating plate, open the ventilation facility, and adjust the temperature to 260°C Heat the sample until the sample turns into a black solid, and then continue heating for 30 minutes. Then place the quartz beaker carefully in a high-temperature furnace, raise the temperature from room temperature to 625°C, and keep it at 625°C for 60 minutes to ensure thorough ashing.

[0037] After ashing, remove to cool. Add 5ml of 1:1 HNO to the quartz beaker 3 , then add 15ml of 1:1 HCl, adjust the temperature of the electric heating plate to 100°C, heat the solution to 1-3ml, cool it, and use 2% HNO 3 Transfer the sample...

Embodiment 2

[0041] Embodiment 2: The transformer oil analysis sample of the present invention is the collected oil sample, which is heated and shaken, and quantitatively weighed, that is, heated at 50°C for 15 minutes, taken out and shaken, and the weighing range of the transformer oil analysis sample is controlled at 15g ;

[0042] The present invention adopts the infrared heating method to carry out constant temperature evaporation and carbonization on the quantitative transformer oil analysis sample, and the infrared heating step is to use a temperature-controllable ceramic infrared electric heating plate at a temperature of 250 ° C until it is completely carbonized;

[0043] The present invention performs high-temperature ashing on the carbonized sample, and the high-temperature ashing is to slowly raise the temperature from room temperature to 625°C, and keep it at 625°C for 60 minutes;

[0044] The present invention uses acid solution to dissolve the ashed sample under low temperatu...

Embodiment 3

[0049] Embodiment 3: The transformer oil analysis sample of the present invention is the collected oil sample, which is heated and shaken, and quantitatively weighed, that is, heated at 55°C for 17 minutes, taken out and shaken, and the weighing range of the transformer oil analysis sample is controlled at 10g ;

[0050] The present invention adopts the infrared heating method to carry out constant temperature evaporation and carbonization on the quantitative transformer oil analysis sample, and the infrared heating step is carried out at a temperature of 260°C±10°C by using a temperature-controllable ceramic infrared electric heating plate until it is completely carbonized;

[0051] The present invention performs high-temperature ashing on the carbonized sample, and the high-temperature ashing is to slowly raise the temperature from room temperature to 625°C, and keep it at 625°C for 60 minutes;

[0052] The present invention uses acid solution to dissolve the ashed sample un...

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Abstract

The invention relates to a method for simultaneously determining various metal elements in transformer oil. An analyzing sample of the transformer oil of the invention is weighed quantificationally after a collected oil sample is heated and stirred uniformly; an infrared heating method is adopted for carrying out vaporizing and carbonizing at constant temperature on the analyzing sample of the quantificational transformer oil, a box type high temperature furnace is adopted for carrying out high temperature cineration on the carbonized sample, acid liquid is adopted for carrying out dissolving on the incinerated sample under the lower temperature heating condition, a soluzione leggermente acida is adopted for carrying out diluting and volume fixing on the dissolved sample to be prepared into analyzing liquid. The analyzing liquid accurately determines the content of various metal elements by using a complete spectrum direct reading plasma emission spectrum apparatus. The method of the invention can determine a plurality of elements and has high accuracy, can determine oil mediums with different varieties and content ranges, being capable of accurately showing the change current of the metals in the oil mediums and being convenient for accurately analyzing and finding out hidden troubles in time.

Description

technical field [0001] The patent of the present invention relates to a simultaneous determination method of various metal elements in transformer oil. technical background [0002] In recent years, in order to meet the development needs of the national economy, the country has increased investment in the power industry, and more and more large-capacity units have been put into operation one after another. With the construction of a large power grid, the safety of the power grid has an increasing impact on society. Among the many factors that affect the safety of the power grid, the operation failures and accidents of power equipment caused by the existence of excessive metal impurities in oil have become more and more important in recent years. Happens from time to time everywhere. However, the problems caused by metallic impurities in oil are not well understood. The research on the faults caused by metal impurities and the analysis methods of metal impurities in oil has...

Claims

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Application Information

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IPC IPC(8): G01N21/62G01N1/44
Inventor 石景燕孙心利李振海
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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