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There are many kinds of external phenomena with power equipments running state changing, and one of the important characters is acoustic signal mutation when power transformer would get out of order. But it is difficult to judge the acoustic change degree and describe the failure character scientifically only by human subjective sensation. The acoustic monitoring can be realized with non-contact measurement,...
The paper summarizes produce over voltage principle of 110 KV main transformer central point and problem in protect mode, suggest has grounding protection of low reactance and this method could protect main transformer in 110 KV transformer substation effectively.
This paper proposes a simple and practical method for determining the optimal acoustic noise levels of transformers to be replaced in an aged substation. The proposed algorithm is based on a reverse calculation method and Linear Programming using an empirical formula for estimating noise levels at the boundary points around the substation premises. Necessary input parameters are three dimensions of...
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