Abstract
In order to analyze the composition of pyrolysis products of insulating oil at different thermal fault levels, this paper proposes a thermal fault simulator device for oil-filled equipment. This device simulates different thermal fault levels by changing the heat source temperature, provides the real pressure environment by using a closed container and analyzes the composition of the insulation products by chromatographic analysis methods. By analyzing the temperature and velocity of flow distributions, it is proved that the fault simulator results are consistent with the actual results. The influence of heat source energy on the pyrolysis reaction of insulating oil is also discussed. The obtained results show that the correlation coefficient between pyrolysis product and heat source energy reaches 0.978. As a result, a multivariate nonlinear energy calculation model is presented to establish the relationship between the complete reaction process and energy. By calculating the energy absorbed by different products during the reaction, it can be found that the decomposition of alkanes absorbs a large amount of energy at the initial stage of pyrolysis, which corresponds to low temperature overheating fault. When the pyrolysis reaction continues, dehydrogenation occupies the leading role, which corresponds to high temperature overheating fault. This can be used as an effective basis for distinguishing fault levels according to the corresponding relationship between energy and fault level.
Highlights
Insulating oil as the main insulating material can guarantee the normal operation of the transformer [1]
By using the thermal fault simulator for oil-filled equipment, this paper focuses on analyzing the relationship between heat source energy and products of pyrolysis reaction of insulating oil
According to the two-stage pyrolysis theory of mixed insulating oil [4] combined with our analysis, when the heating energy of heat source is low, it can be deduced that alkane chains are broken to produce methane, while the methane gas content increases again because of the decomposition reaction of naphthenes and aromatic hydrocarbons in the mineral insulating oil
Summary
Insulating oil as the main insulating material can guarantee the normal operation of the transformer [1]. In the 1970s, Halstead deduced the chemical reaction equations and analyzed them theoretically, obtaining a model of gas production by pyrolysis of mineral oil under fault conditions [7]. Suntivarakorn studied the pyrolysis process of oil by using a circulating fluidized bed reactor [10] Jakob and his team proposed a transformer fault diagnosis model based on chemical reaction enthalpy changes which initially explained the pyrolysis reactions of insulating oil from the angle of enthalpy change [11]. Fault simulation is one of the effective means to study the mechanism of pyrolysis reactions which can analyze the pyrolysis process from different viewpoints, such as reaction conditions, reaction environment, reaction products and so on. By using the thermal fault simulator for oil-filled equipment, this paper focuses on analyzing the relationship between heat source energy and products of pyrolysis reaction of insulating oil. A multivariate nonlinear energy calculation model is presented to describe this relationship
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