| 摘要 |
<p>The invention relates to a method and an arrangement for determining the direction of excess currents in energy supply systems with at least one local or transformer substation, which connects a medium-voltage system (1) and a low-voltage system (3) to one another by way of a transformer (4). By means of a first measuring transducer (2), a current measurement is carried out in at least one outgoing circuit of the medium-voltage system (1) and a voltage measurement is carried out in the low-voltage level (3) of the transformer (4) or a downstream low-voltage distribution unit, and an excess current is detected. The current and voltage measurement is used to determine the phase position between the current measured in the medium-voltage level (1) and the voltage measured in the low-voltage level (3) or the power flow in the medium-voltage system (1). By means of the first measuring transducer (2) or a processing unit (5) interacting with it, the phase position or the power flow in the medium-voltage system (1) is evaluated while taking the phase rotation of the transformer (4) into account and used as a basis for determining the direction of the excess current.</p> |
