System and method of locating ground fault in electrical power distribution system

A system for locating a ground fault in an electrical power distribution system comprising:

• plurality of current sensors adapted to monitor current at a plurality of locations in the distribution system;
• a test signal generating device configured to introduce a test signal into the distribution system wherein the test signal is a tone signal at a harmonic frequency of the frequency of current distributed by the system;
• and
• a processor configured to receive signals from the current sensors to identify a location of the ground fault between a location at which the test signal is detected and a downstream location at which the test signal is not detected.

A method for locating a ground fault in an electrical power distribution system comprising:

• providing a plurality of current sensors at a plurality of locations in the electrical power distribution system;
• detecting a ground fault in the electrical power distribution system;
• monitoring current at the plurality of locations in the electrical power distribution system via the current sensors;
• introducing a test signal into the electrical power distribution system via a test signal generating device;
• and
• monitoring the plurality of locations to locate the ground fault between a location at which the test signal is detected and a downstream location at which the test signal is not detected;
• wherein locating the ground fault includes identifying zero sequence current values in phase with voltage across a grounding resistor.

A method for locating a ground fault in an electrical power distribution system comprising:

• providing a plurality of current sensors at a plurality of locations in the electrical power distribution system;
• detecting a ground fault in the electrical power distribution system;
• monitoring current at the plurality of locations in the electrical power distribution system via the current sensors;
• introducing a test signal into the electrical power distribution system via a test signal generating device;
• and
• monitoring the plurality of locations to locate the ground fault between a location at which the test signal is detected and a downstream location at which the test signal is not detected
• wherein locating the ground fault includes identifying zero sequence current values out of phase with current through a grounding resistor.

A system for locating a ground fault in an electrical power distribution system comprising:

• plurality of current sensors adapted to monitor current at a plurality of locations in the distribution system;
• a test signal generating device configured to introduce a test signal into the distribution system;
• and
• a processor configured to receive signals from the current sensors to identify a location of the ground fault between a location at which the test signal is detected and a downstream location at which the test signal is not detected;
• wherein locating the ground fault includes identifying zero sequence current values in phase with voltage across a grounding resistor.

A system for locating a ground fault in an electrical power distribution system comprising:

• plurality of current sensors adapted to monitor current at a plurality of locations in the distribution system;
• a test signal generating device configured to introduce a test signal into the distribution system;
• and
• a processor configured to receive signals from the current sensors to identify a location of the ground fault between a location at which the test signal is detected and a downstream location at which the test signal is not detected;
• wherein locating the ground fault includes identifying zero sequence current values out of phase with current through a grounding resistor.