关于变压器铁芯和夹件多点接地的讨论

Discussion on Multipoint Grounding of Transformer Core and Clamp

在运行状态下,油中溶解气体组分、铁芯和夹件接地电流是判断变压器运行状态的有效方法。为了准确判断油中溶解气体组分、铁芯和夹件接地电流数据异常时变压器的内部状态,以及停电后更精准地定位异常位置和消除异常点,文章详细分析了铁芯和夹件在两点接地和一点接地2种运行方式下出现多点接地异常、油中溶解气体组分异常的各种可能性,并提出了对应的判断和解决异常的方法,最后,基于某110 kV异常变压器进行了试验验证,表明所作分析对判断、消除多点接地问题具有切实意义,具有较高的应用价值和推广价值。

Under operating conditions,dissolved gas components in oil,grounding current of iron cores and clamps are effective methods to determine the operating status of transformers.In order to accurately determine the internal state of transformers when the dissolved gas components in oil and the grounding current data of iron cores and clamps are abnormal,as well as to more accurately locate and eliminate abnormal points after power outage,this article analyzes in detail the various possibilities of multiple grounding abnormalities and dissolved gas components in oil under two operation modes of two point grounding and one point grounding for iron cores and clamps,and proposes corresponding methods for judging and resolving abnormalities,Finally,experimental verification was conducted on a 110 kV abnormal transformer,indicating that the analysis has practical significance in determining and eliminating multi-point grounding problems,and has high application and promotion value.