System and method for locating remote earth fault section in power grids

A system for remote locating earth fault in a multi-phase power grid powered by a power source, the system comprising:

• an alternating voltage source synchronized with the power grid, and which is connected between a zero point of the power grid and earth,
• a control unit configured to control the alternating voltage source in a fault current compensation mode to compensate for any ground fault current in the power network to a value below a threshold level, and
• at least one detector arranged in the power grid and communicatively connected to the control unit, which at least one detector is configured to register measurement values representing zero-sequence current and zero-sequence admittance,
• wherein said at least one detector is also configured to register measurement values to be applied by said control unit to determine an earth fault impedance RF and a corresponding delta angle step X;
• the system further comprises at least one remote detector arranged in the power grid, and not communicatively connected to the control unit, wherein each at least one remote detector has a unique current pattern identity;
• the control unit, when in a remote earth fault detection mode, is configured to adjust a voltage from the alternating voltage source with respect to the determined earth fault impedance RF and a corresponding delta angle step X to generate a zero-sequence current pattern based upon said impedance and said delta angle step X, wherein each at least one remote detector is configured to identify a zero-sequence current pattern, and to determine which remote detector has a unique current pattern identity that corresponds to the identified current pattern.