ARRANGEMENT FOR INJECTION-BASED GROUND FAULT PROTECTION HANDLING

摘要

The invention concerns arrangement for injection-based ground fault protection handling comprising a number of stator windings (12A, 12B, 12C) of an electric machine (10) that are connected to a neutral point (NP), a first transformer (TR1) comprising at least one primary winding connected to at least one measurement point (NP) of the stator windings (12A, 12B, 12C) and at least one secondary winding for measuring an electrical quantity of the machine at the measurement point. There is also a second transformer (TR2) having a primary winding connected between the neutral point (NP) and a ground potential and a secondary winding for connection to a signal generation and detection unit (16) in order to inject a signal into the neutral point (NP) and receive a response. The impedance of the second transformer (TR2) is in the range of the impedance of the machine (10).