Method and system for ac fault detection
AssigneeRaytheon Systems Limited
InventorDavid Calkin
Life of this patent
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Abstract
A method of monitoring a three-phase alternating current (AC) signal includes carrying out analog to digital (A/D) conversion of each phase of the AC signal to produce respective digital voltage signals; calculating at least one of a direct component (d) value and a quadrature component (q) value in a rotating reference frame rotating at a fundamental frequency of the AC signal from the digital voltage signals using a Park Transform; comparing the at least one of a d value and a q value to one or more thresholds; and based on the result of the comparing, detecting deviation of the AC signal from a desired waveform.
Claims20
A method of monitoring a three-phase alternating current (AC) signal, the method comprising:
- carrying out analog to digital (A/D) conversion of each phase of the AC signal to produce respective digital voltage signals;
- calculating at least one of a direct component (d) value and a quadrature component (q) value in a rotating reference frame rotating at a fundamental frequency of the AC signal from the digital voltage signals using a Park Transform;
- comparing the at least one of the d value and the q value to one or more thresholds;
- and
- based on a result of the comparing, detecting deviation of the AC signal from a desired waveform.
A system for monitoring a three-phase alternating current (AC) signal, the system comprising:
- at least one analog to digital (A/D) converter configured to produce respective digital voltage signals corresponding to each phase of the AC signal;
- and
- at least one processing device configured to:
- calculate at least one of a direct component (d) value and a quadrature component (q) value in a rotating reference frame rotating at a fundamental frequency of the AC signal from the digital voltage signals using a Park Transform;
- compare the at least one of the d value and the q value to one or more thresholds;
- and
- based on a result of the comparing, detect deviation of the AC signal from a desired waveform.
A non-transitory computer-readable medium containing instructions that, when executed by one or more processors, cause the one or more processors to:
- obtain respective digital voltage signals from analog to digital (A/D) conversion of each phase of a three-phase alternating current (AC) signal;
- calculate at least one of a direct component (d) value and a quadrature component (q) value in a rotating reference frame rotating at a fundamental frequency of the AC signal from the digital voltage signals using a Park Transform;
- compare the at least one of the d value and the q value to one or more thresholds;
- and
- based on a result of the comparing, detect deviation of the AC signal from a desired waveform.
Dependencies are inferred from the claim text.