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.
Proud
Put forward special negative pressure oil extraction device for transformer
And sampling method
To make the inside of the oil pipe
And sampling
The inside of the bottle forms a closed environment, which changes the exposure to the atmosphere during the previous sampling (due to poor weather air quality), causing secondary pollution of the oil sample, affecting the measurement results, saving time and effort, and ensuring the oil and the sample oil well. Consistency, the sampling process is safe and reliable, and easy to operate.
At present, China's GB/T7595-2008 "Running Transformer Oil Quality Standard" has been listed as an inspection item for the increase of granularity in 500kV voltage grade oil. DL/T1096-2008 "Grainity Limits in Transformer Oil" Quality Standard Scope: Quality supervision of transformers and reactor oils of 500kV and above, the control indicators are as follows. The oil particle size of AC transformers of 500kV and above should be controlled: before the operation (after hot oil circulation), the number of particles larger than 5μm in 100ml oil is ≤2000, and the number of particles larger than 5μm in 100ml oil during operation (including overhaul) ≤3000 One. Before 500kV and above DC commutation, the particle size should be controlled before: hot oil circulation: the number of particles larger than 5μm in 100ml oil is ≤1000. At present, the PLD0201 oil particle size analyzer of Proudit is used for particle detection.
The next is Proud's measurement and control of transformer oil.
Particle size test sampling method and device
Introduction:
A,
Oil sampling requirements
1) Sampling container: distilled water or deionized water should be used successively
Cleaned
Isopropanol
Or high clean ethanol
Rinse the container and dry it for later use. If the container is rinsed with the sample taken, it should be taken immediately after rinsing, or a PULL/Puller 250ml cleaning bottle (NAS16380) can be purchased.
2)
Sampling tube
Need to use good quality, long-term resistance to insulating oil corrosion and no chemical reaction with insulating oil, nor induce or catalyze the insulating oil, pre-use
Sampling tube
It must be distilled or deionized water and passed through
Cleaned
Isopropanol
Or high clean ethanol
Rinse the container and dry it for later use.
3) Sampling of new oil: Sampling from the middle to the bottom of the oil drum using a sampling tube. If there is any free water in the oil, it should be sampled from the bottom of the oil drum. The sampling tool should be used.
Cleaned
Isopropanol
Or high clean ethanol
Wash and dry for use. To avoid settling, the liquid should be thoroughly agitated prior to sampling.
4) Running oil sampling: the sampling valve should be used before sampling
Cleaned
Isopropanol
Or high clean ethanol
Cleaning; at least 1~2L of liquid should be discharged from the valve before sampling, and the valve opening should not be adjusted during flushing and sampling.
B,
Sampling device
This oil sampling tool contains
Puller
Negative pressure type oil sampler, NAS16380 grade hose, 250ml oil NAS16380 grade cleaning bottle, etc.
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 tubing and PULL/Puller 250ml cleaning bottle have been purified in advance (up to NAS16380), 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,
Attention 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.
Sampling is not allowed when the oil temperature is lower than the ambient temperature. It should not be sampled when the relative humidity is higher than 75%. It should not be sampled in weather with wind and rain. If sampling under special circumstances, the corresponding measures must be taken. 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 and 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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Described including the upper shell, the upper shell at the top of the smoke outlet, as described in the bottom of the upper shell with airway, described with the smoke outlet in the airway and also to match the upper shell, the lower part of the shell described the airway in the direction of the lower shell extension, as described in the lower shell near one end of the upper shell is equipped with oil mouth, described the lower shell with batteries, described at the bottom of the bottom shell has come in The air port is provided with an oil storage bin in the lower shell, and the air passage passes through the oil storage bin and is provided with a heating atomization bin at one end away from the smoke outlet. The utility model has beneficial effects: it can meet the smoking habit of different users, avoid the premature end of the use experience caused by excessive consumption of smoke oil, and indirectly prolong the service time and life of the product.
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