A method for detecting a faulty connection in an earth grid (104) or an equipment, wherein the earth grid (104) is connected to a plurality of equipment (102A-B), wherein a first equipment (102A) from the plurality of equipment (102A-B) is connected to the earth grid (104) through a plurality of first risers (106A-B) and a second equipment (102B) from the plurality of equipment (102A-B) is connected to the earth grid (104) through a second riser (108), wherein the method comprises:
- modifying, using a frequency converter (502) of a current injection device (110) of a system, an input current with grid frequency into an input current with off grid frequency;
- regulating, using a current unit (504) of the current injection device (110), the input current with off grid frequency into a variable input current with off grid frequency;
- receiving, using a first reference riser (106A) and a second riser (108) of the system, a first input current with off-grid frequency from a current injection device (110) and providing the first input current with off-grid frequency to an earth grid (104) for detecting a faulty connection using the second riser (108) that is under test when the current injection device (110) is electrically connected to (i) the first reference riser (16A) from the plurality of the first risers (106A-B) at a first current injection point (112) and (ii) the second riser (108) at a second current injection point (114);
- receiving, using a second equipment (102B) or a body of the second equipment (102B) and the second riser (108) of the system, a second input current with off grid frequency from the current injection device (110) and providing the second input current with off-grid frequency to the second riser (108) under test for detecting a faulty connection in the second equipment (102B) or the body of the equipment (102B) using the second riser (108) that is under test when the current injection device (110) is electrically connected to (i) a second equipment (102B) or a body of the second equipment (102B) at a third current injection point (120) and (ii) the second riser (108) at the second current injection point (114);
- measuring, using a first current measuring device (116) of the system, a first current that is received by the second riser (108) from the earth grid (104);
- measuring, using a second current measuring device (118) of the system, a second current that is received by the second riser (108) from the second equipment (102B) or the body of the second equipment (102B);
- and
- characterized in that, comparing, using the system, the first current, the second current, the first input current, and the second input current and determining a faulty connection in
- (i) the second equipment (102B) if at least one of (a) the second current that is received by the second riser (108) under test from the body of the second equipment (102B) is below the first current that is received by the second riser (108) under test from the earth grid (104), (b) the second current that is received by the second riser (108) under test from the second equipment (102B) is below the second input current that is provided to the body of the second equipment (102B), or (c) the second current that is received by the second riser (108) under test from the body of the second equipment (102B) is zero, and
- (ii) the earth grid (104) if at least one of (a) the first current that is received by the second riser (108) under test from the earth grid (104) is below the second current that is received by the second riser (108) under test from the body of the second equipment (102B), (b) the first current that is received by the second riser (108) under test from the earth grid (104) is below the first input current that is provided to the earth grid (104), or (c) the first current that is received by the second riser (108) under test from the earth grid (104) is zero.