(1) the oil sample should be able to represent the equipment body oil, and avoid sampling at the dead corner where the oil circulation is not enough. Samples should be taken from the sampling valve at the bottom of the equipment and, under special circumstances, samples at different sampling locations.
(2) the sampling requirements fully sealed, sampling reliable connection, can not let the loss of water and dissolved gas in oil, but also can not be mixed with air (must be drained sampling joint remaining in the air), when oil may not produce bubbles.
(3) sampling should be carried out on sunny days. After sampling, the syringe core can be freely moved to avoid forming a negative pressure cavity.
(4) oil samples should be kept away from light.
(5) use 500 ~ 1000mL sampling bottle, first wash with detergent, and then rinse with tap water, finally rinse with distilled water, dry, cool, and then close the bottle stopper.
(6) for transformers, oil switches, or other oil filled electrical equipment, samples should be taken from the lower valve. Before sampling, the oil valve should be cleaned with clean cotton or cloth first, then put oil to be cleaned.
Insulating oil is widely used in high voltage electrical equipment, such as transformers, oil circuit breakers, cables, capacitors and transformers, etc. most of them are filled with insulating oil.
In the electrical equipment, the crew of the transformer oil in transformer operation plays a strengthening insulation, cooling or quenching effect. In order to ensure the quality of transformer oil, the relevant tests must be carried out on a regular basis.
Among them, the transformer oil electrical strength test is a major content. In the experiment, the sampling of transformer oil is an important link. Transformer oil sampling refers to the removal of a small fraction of the sample oil in the transformer oil to be tested. In order to ensure that the sample is not out of shape, the test personnel must strictly comply with the requirements of sampling, and seriously carry out the work.
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