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Method and apparatus for adapting earth-fault protection settings in a three-phase electric network
Method and apparatus for adapting earth-fault protection settings in a three-phase electric network
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机译:在三相电网中适应接地故障保护设置的方法和装置
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摘要
A method and an apparatus for adapting earth-fault protection settings in a three-phase electric network, the apparatus (10) comprising means for determining a value for a directional phasor quantity at a measuring point in the three-phase electric network after an earth fault has been detected in the three-phase electric network, means for comparing the determined value for the directional phasor quantity with predetermined boundaries on a complex plane, means for determining, on the basis of the comparison, a neutral earthing state of the electric network, and means for adapting one or more earth-fault protection settings on the basis of the determined neutral earthing state of the electric network.
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