1、Unusual noise
(1It is may be the
transformer core problem if the sound is large and noise. For example, when the clampingpiece or the core screw is loose, the instrument is normal, and the color of the insulation oil, temperature and oil level does not change too much, yet at the moment it is need to stop the
transformer for check.
(2)If there is a mixture of water boiling sound-the bubble escaping sound, it may be that the windings are serious failured and thus cause the nearby components emit heat and then the oil gasficated. The overheat of the partial poit or the transfsormer turns is short-circuit result from the poor contact of tap changer, and such noise will be produced, and at this moment, the
transformer should stop at once for the repair.
(3)If there is explosion sound, large and uneven, it may be that there is a breakdown of body insulation. And the
transformer should stop for overhaul.
(4)If there is a mixture of discharging noise, it maybe that the surface partial discharge exists in the
transformer body or the bushing. If it is the bushing problem, the corona glow or the blue, purple small park can be seen in the bad wheather or at night. And at the moment, it need to clean the dirt of the bushing surface and then painted with oil or silicone grease. The
transformer should also stop to check the distance of the iron earthing and other charged parts whether comply with the standard.
(5)If there is a mixture of continous and regulationed clash or grating sound, it maybe that the mechanical frication of a certain parts of the
transformer resulted from the core vibration or static discharging, all the measurement instructions and temperatures do not have any response. The noise is though abnormal, yet does not have bad effect on operation and therefore it does not need to stop the
transformer, and it can exclude these problems when shedualed overhaul.
2、abnormal temperature
Under the condition of constant load and cooling, temperature, the temperature is more higher and has the trend of rising, it together with the super-elevated temperature limit rise is the phenomenon of abnormal temperature.
reasons for abnormal temperature rise：
①short-circuit between
transformer turns, layers and bumps；
②
transformer partial core short-circuit；
③tank and cover heats for leakage of wortex；
④long-term of overload operation or accidenat overload；
⑤bad cooling condition.
When found the temperature is abnormal during operation, it first should to check the reasons and then apply appropriate measurement to lower down the temperature, and if it is caused by the internal fault, the
transformer should stop to prepair.
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