Abstract: A method is for checking the adequacy of the residual currents passing through a differential circuit breaker disposed at the head of an electrical installation. The method includes acquiring over a total acquisition duration, at a determined sampling frequency, residual current samples during successive acquisition periods; frequency-analyzing by FFT these residual current samples in predetermined frequency bands; determining for each frequency band and for each of the successive acquisition periods, a maximum effective current and, at the end of the total acquisition duration, recording the maximum value of the maximum effective currents; and disqualifying or not the differential circuit breaker depending on whether or not this maximum value of the maximum effective currents meets a predetermined compatibility condition and displaying this disqualification or non-disqualification in binary mode by a pictogram on the leakage current measuring clamp.

Abstract: The invention relates to a measurement clamp comprising a fixed jaw and a moving jaw, the fixed jaw comprising a first magnetic core entirely surrounded by a first magnetic shield and the moving jaw comprising a second magnetic core entirely surrounded by a second magnetic shield, the first and second magnetic cores being separated by two diametrically opposite air gaps each receiving a magnetic flux sensor, and an external flux-cancellation coil surrounds one or the other, or both, of the first and second magnetic shield.

Abstract: A method is for checking the adequacy of the residual currents passing through a differential circuit breaker disposed at the head of an electrical installation. The method includes acquiring over a total acquisition duration, at a determined sampling frequency, residual current samples during successive acquisition periods; frequency-analyzing by FFT these residual current samples in predetermined frequency bands; determining for each frequency band and for each of the successive acquisition periods, a maximum effective current and, at the end of the total acquisition duration, recording the maximum value of the maximum effective currents; and disqualifying or not the differential circuit breaker depending on whether or not this maximum value of the maximum effective currents meets a predetermined compatibility condition and displaying this disqualification or non-disqualification in binary mode by a pictogram on the leakage current measuring clamp.

Abstract: The invention relates to a measurement clamp comprising a fixed jaw and a moving jaw, the fixed jaw comprising a first magnetic core entirely surrounded by a first magnetic shield and the moving jaw comprising a second magnetic core entirely surrounded by a second magnetic shield, the first and second magnetic cores being separated by two diametrically opposite air gaps each receiving a magnetic flux sensor, and an external flux-cancellation coil surrounds one or the other, or both, of the first and second magnetic shield.