Capacitor bank fault detection and identification

One or more tangible, non-transitory, computer-readable media comprising instructions that, when executed by a processor of an intelligent electronic device configured to control at least part of an electric power distribution system, cause the processor to:

• determine a neutral current of a multi-phase capacitor bank system based on a neutral current sensor;
• in response to a magnitude of the neutral current being greater than a first threshold value, calculate a power phasor for each phase the multi-phase capacitor bank system with respect to an ABC phase rotation, an ACB phase rotation, or both based at least in part on a combination sensor that measures voltages at one or more phases of the multi-phase capacitor bank system;
• in response to each magnitude of each power phasor being within a first predetermined range, determine a fault event of the multi-phase capacitor bank system and therefore:
• determine which phase of the one or more phases each corresponding to a respective capacitor, switch, and fuse are faulted based on each phase angle of each power phasor;
• and
• issue a notification indicating the phase that is faulted based on a failure of the capacitor, the switch, or the fuse.

An intelligent electronic device, comprising:

• processing circuitry;
• a communication system;
• and
• a memory device comprising instructions that cause the processing circuitry to:
• calculate a power phasor for each phase of a multi-phase capacitor bank system with respect to an ABC phase rotation, an ACB phase rotation, or both, wherein the multi-phase capacitor bank system comprises one or more phases each corresponding to a respective capacitor, switch, and fuse;
• in response to each magnitude of each power phasor being greater than a threshold value:
• determine which phase of the one or more phases is faulted based on each phase angle of each power phasor;
• and
• issue a notification indicating the phase of the one or more phases is faulted based on a failure of the capacitor, the switch, or the fuse.