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Oil particle size test sampling method and device for transformer
In the installation and maintenance of electrical equipment, the insulating oil in transformers, reactors and other equipment needs to be taken for inspection. After the test is passed, the equipment is put into operation. Due to improper oil sample method, oil sample storage, transportation, long time and other factors affecting the test items of the oil sample failed, resulting in repeated sampling tests. Proudy proposed a special negative pressure oil extraction device and sampling method for the transformer to form a closed environment inside the oil extraction pipe and inside the sampling bottle, which changed the exposure of the previous sampling to the atmosphere (due to poor weather air quality), resulting in secondary pollution of the oil sample. It affects the measurement results, saves time and effort, and can ensure the consistency of the oil and the sample oil. The sampling process is safe and reliable, and the operation is convenient.
At present, China GB / T7595 - 2008 "in transformer oil quality standards" has been listed as test items to increase the voltage level of 500kV oil graininess. DL/T1096 - 2008 " Grainity Limits in Transformer Oil" Quality Standard Scope: The quality supervision of transformers and reactor oils of 500kV and above, the control indicators are as follows. 500kV or more AC transformer oil particles of suitable and controlled: before (hot oil circulation) OPERATION The number of particles larger than 5 μ m in 100ml oil ≤ 2000 th, run (after including overhaul) 100ml oil is greater than 5 μ m of The number of particles is ≤ 3000 . 500kV and above before put into operation dc converter transformers (hot oil circulation) should be controlled in particle size: 100ml oil number of particles larger than 5 μ m ≤ 1000 th. At present, the PLD0201 oil particle size analyzer of Proudit is used for particle detection.
The following is an introduction to Prodi's measurement and control of the oil particle size test sampling method and device for transformers:
A , oil sampling requirements
1 ) Sampling container: The container should be rinsed with distilled or deionized water and cleaned isopropyl alcohol or high-clean ethanol, and then dried for use. If the samples taken rinsing container, should be sampled immediately after rinsing, can also be purchased PULL / Doppler cleaning 250ml bottle (NAS16380 level).
2 ) The sampling tube needs to be of good quality, can withstand long-term resistance to insulating oil corrosion and does not produce any chemical reaction with the insulating oil, nor does it induce or catalyze the insulating oil. The pre-use sampling tube must be distilled water or deionized water. Rinse the container with cleaned isopropyl alcohol or high-clean ethanol and dry for use.
3 ) New oil sampling: Use the sampling tube to sample from the middle to the bottom of the oil drum. If it is suspected that there is free water in the oil, it should be sampled from the bottom of the oil drum. The sampling tool should be cleaned and dried with cleaned isopropanol or high clean ethanol. Dry spare. To avoid settling, the liquid should be thoroughly agitated prior to sampling.
4 ) Run oil sampling: The sampling valve should be cleaned with cleaned isopropanol or high clean ethanol before sampling; at least 1~2L of liquid should be discharged from the valve before sampling, and the valve opening during flushing and sampling Adjustments should not be made.
B , sampling special device
The oil sampling tool includes a Puller negative pressure oil sampler, a NAS16380 grade hose, a 250ml oil NAS16380 grade cleaning bottle, and the like.
Note: When taking the next oil sample, please replace the new (cleaned and sealed) special sampling tube to avoid cross-infection between the previous oil sample and the next oil sample, which will lead to misjudgment of oil detection. During the sampling process, the oil is taken under negative pressure, and the Puller oil pipe and PULL/ Puller 250ml cleaning bottle have been purified in advance (can reach NAS16380 level), and the oil pipe and oil bottle are barely exposed during the oil extraction process. The atmosphere makes the airborne dust rarely mixed into the oil, making the oil pollution index measurement closer to the true value.
C , pay attention to the problem
When sampling, take a sample from the lower valve of the transformer (including the sealed sampling valve). The oil valve should be cleaned with a clean grade A cotton yarn or gauze before sampling. Unscrew the nut, connect the oil-resistant tube for sampling, drain the pipeline and drain the oil. The flushed oil should be collected and should not be discharged directly to the site. After the tubing is rinsed out, take a sample bottle and sample it. End the sample, cover the stopper and tighten the device nut. Note: When taking the next oil sample, please replace the special sampling tube in time to prevent cross contamination of the oil sample.
After sampling is not allowed when the oil temperature below ambient temperature, relative humidity should be sampled at more than 75%, in wind and rain, foggy weather should not be sampled if the sampling in exceptional circumstances, the appropriate measures must be taken in order sampling.
Before measuring, first observe the appearance of the measured medium to see if there are visible impurities, bubbles or oily media containing water droplets. If there are more impurities, it is not advisable to use the instrument for detection, as large particles (>500mm) may cause blockage of the sensor. Excessive water content in the oil will seriously affect the measurement results, so that the measured amount of particles is seriously high; in this case, the dehydration treatment should be carried out before taking measurements or considering oil changes.
The viscosity of the measured medium is also the user's attention. In the case of sampling measurement, the viscosity should generally not exceed 100 mm 2 / s ; in the case of high pressure on-line measurement, the measurable viscosity should generally not exceed 500 mm 2 / s . The viscosity limit is preferably such that the measured medium can be smoothly inhaled into the system. If the measured medium is too viscous, it needs to be diluted before it can be measured.
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