In order to prevent the iron-core from the fault of the iron-core heating because of the earthing current exceeding in the operation process of the transformers,the paper points out the new iron-core earthing intelligent protection principle for the new transformers,adopts the automatic current limiter when the earthing current surpasses the national standards by the time supervision of the iron-core earthing current of the transformers,realizes the earthing current to be limited within the regulation,and undertakes the on-line maintenance,the evaluation,the early warning,and the risks analysis on the electronic equipment,so as to prevent the accidents before they occur.%为了预防电力变压器运行过程中因铁芯多点接地导致接地电流超标而造成的铁芯发热故障,提出了一种新的变压器铁芯接地智能保护原理,并通过对变压器铁芯接地电流的实时监测,在检测到接地线电流超过国家标准后采取自动启动限流装置的措施,实现将接地电流限制在规程要求的范围之内,并对电气设备状态进行在线检修、评估、预警和风险分析,从而达到防患于未然的目的。
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