For different test items of transformer oil, different containers should be used for sampling.
Generally speaking, transformer oil samples used in chromatographic analysis of water content, gas content and dissolved gas should be taken by syringe, and oil samples used in other projects can be taken by Brown abrasive bottle.
Transformer oil samples used for measuring water content and gas content with syringes are mainly used to isolate air, low water content and gas content transformer oil, which absorbs moisture very quickly and can be sampled in air or in bottles. The results of measurement will be more error. Even if the syringe is used for sampling, if the syringe is not well sealed or leaks due to excessive wear and tear, it will also cause errors in the increase of water content and gas content.
The dissolved gas chromatographic analysis of transformer oil with syringe can not only isolate the air, but also prevent the dissolved gas from dispersing in transformer oil and facilitate the degassing during test. If the degassing device has special requirements for the sampling container, it must be matched with a special sampling container.
There are two advantages of sampling with brown flask: one is to shade the light; the other is to seal relatively good and easy to open. For the general test items, the oil sample can not see the light, which has little effect on the test results, but for the dielectric loss factor of transformer oil, the test results are obviously different from those without light, and the test results are inaccurate without brown bottle sampling; even if the use of brown bottle sampling, it is not appropriate to be long under strong light. Time irradiation.
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