US 12,276,685 B2
Measuring the impedance in grounding systems
Verónica Pomar Pedredo, Paterna (ES); David Ruiz Muñoz, Paterna (ES); and Julio Sánchez Jimeno, Paterna (ES)
Assigned to APLICACIONES TECNOLOGICAS, S.A., Valencia (ES)
Appl. No. 18/018,370
Filed by Aplicaciones Tecnologicas, S.A., Paterna (ES)
PCT Filed Jul. 29, 2020, PCT No. PCT/ES2020/070491
§ 371(c)(1), (2) Date Jan. 27, 2023,
PCT Pub. No. WO2022/023588, PCT Pub. Date Feb. 3, 2022.
Prior Publication US 2024/0036092 A1, Feb. 1, 2024
Int. Cl. G01R 27/20 (2006.01); G01R 27/16 (2006.01); G01R 31/58 (2020.01); H01M 8/0206 (2016.01); H01M 8/04537 (2016.01); H01M 8/0662 (2016.01); H01M 8/249 (2016.01)
CPC G01R 27/20 (2013.01) [G01R 27/16 (2013.01); G01R 31/58 (2020.01); H01M 8/0206 (2013.01); H01M 8/04559 (2013.01); H01M 8/04589 (2013.01); H01M 8/0662 (2013.01); H01M 8/249 (2013.01)] 5 Claims
OG exemplary drawing
 
1. Method for measuring the impedance of a grounding system that comprises a loop, the method comprising:
for each frequency fi of a set of frequencies F, of a frequency sweep applied to the loop of the grounding system:
generating, using a first generator, a modulating signal Ssignal (2) with a fixed frequency fm, preferably fm=220 Hz;
generating a carrier signal Scarrier (1) with the frequency fi;
obtaining, via an amplitude modulator, an amplitude modulated signal Smodulated (3) with frequency components of the frequencies fm and fi based on Ssignal (2) and Scarrier (1);
inducing, using a current inductor, the signal Smodulated (3) in the loop of the grounding system; and
measuring, using a current sensor, a signal Sout based on the signal Smodulated (3) in said loop of the grounding system;
demodulating, using a demodulator, the signal Sout, eliminating the carrier signal Scarrier (1);
filtering, using a filter, the signal Sout in a frequency tuned way to obtain a demodulated signal Sdemodulated at the frequency fm based on Ssignal (2);
obtaining, using a microcontroller, an impedance Z (fi) of the grounding system based on the demodulated signal Sdemodulated;
wherein obtaining the impedance Z (fi) of the grounding system based on the demodulated signal Sdemodulated comprises calculating a modulating index

OG Complex Work Unit Math
based on the demodulated signal Sdemodulated,
wherein the modulating index m is defined as the ratio of amplitudes,
obtaining, using the microcontroller, a phase measurement φ(fi) based on the respective demodulated signal Sdemodulated for each frequency fi; and
obtaining, using the microcontroller, for the set of frequencies F a Bode plot based on Z(fi), φ(fi), and the modulating index m of each frequency fi, respectively.