A new refining technique was innovatively improved and a series of high-performance transformer oil was successfully developed from non-cyclic alkyl crude oil through hydrocracking, isodewaxing, hydrorefining and proportioning. And it breaks through a barrier that the traditional refining technology was restricted by the type of crude oil. The functional properties, refining and stability, performance in service, health, safety and environment properties of hydrogenated transformer oil were studied comprehensively and deeply under the static and dynamic condition, especially at the level of molecular structure. The safety and reliability of hydrogenated transformer oil in the power transformer has been proven scientifically. In order to further verify the reliability of hydrogenated transformer oil in power transformers, the 110 kV #3 main transformer with hydrogenated transformer oil in Dongguan Power Supply Bureau started to carry load to operate in December, 2011. The transformer has been being regularly monitoring and it has been operating in the good condition. And the research results have been converted into practical application successfully.
Under the condition of Baader aging, the chemical composition variation and the effect of transformer oil aging on electrical properties such as dielectric loss factor and physic-chemical properties such as kinematic viscosity were studied during aging. Moreover, the correlation between hydrogenated transformer oil electrical and physic-chemical properties and its chemical composition variation were investigated.
Based on electrical and chemical analysis in oils of some fault transformers in Shenzhen, it indicates that the corrosive sulfur contained in insulating oils may cause faults. Corrosive sulfur would react to copper wire and engender Cu2S during the operation of transformer. Because of the electric characteristic of Cu2S, this substance will penetrate and pollute insulating paper of the wire, and then weaken the insulation intensity. At last it would wear out coil insulation. Experiments indicate that adding passivator to insulating oil is an effective method to solve the problem. Passivator can form a protection layer on the surface of copper, which can avoid copper corrupting and can stop copper deposition in the presence of potentially corrosive sulfur compounds as well.
Failure in transformers could be caused by the corrosive sulfur in their oil. Preliminary studies on the test of corrosive sulfur in transformer oil and temperature are performed. The comparison among their results of their typical test methods for corrosive sulfur is discussed. It is illustrated that the corrosive-sulfur sensitivity is varied with the test conditions. Temperature is the important factor for the reaction of corrosive sulfur with copper. We have done experiments of specimen immersing and mercaptan content in oil, so we can confirm that high temperature enhances the reaction.
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