| CPC H02H 1/0015 (2013.01) [G01R 21/133 (2013.01); G01R 31/52 (2020.01); H02H 1/0092 (2013.01)] | 19 Claims |
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1. A measurement system for the detection of arc-faults, the measurement system comprising:
a rate of change of current sensor for measuring a rate of change of current in a current carrying conductor;
an arc-fault detection circuit having a first frequency band processing path for detecting arc-faults, the arc-fault detection circuit comprising:
a first analog-to-digital converter, ADC, having an input that is coupled to an output of the rate of change of current sensor;
a frequency analysis circuit coupled to an output of the first ADC, wherein the frequency analysis circuit is configured to detect arc-faults; and
a second detection circuit having a second frequency band processing path, wherein the second frequency band is different than the first frequency band, the second detection circuit comprising:
a low-pass filter coupled to the output of the rate of change of current sensor;
a second analog-to-digital converter, ADC, coupled to an output of the low-pass filter;
a digital integrator coupled to an output of the second ADC, the digital integrator configured to generate an integrated signal;
a digital processor configured to receive the integrated signal, the digital processor configured to determine at least one of:
a measure of the current in the current carrying conductor;
the presence of a short-circuit; and
the presence of a residual current,
wherein the arc-fault detection circuit and the second detection circuit are configured to simultaneously process the different first and second frequency bands from the rate of change of current sensor; and
a voltage measurement apparatus configured to measure a voltage between the current carrying conductor and a neutral conductor, wherein the voltage measurement is used in conjunction with both the arc-fault detection circuit and the second detection circuit.
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