US 11,656,263 B2
Effective feature set-based high impedance fault detection
Qiushi Cui, Tempe, AZ (US); Yang Weng, Chandler, AZ (US); Khalil El-Arroudi, Montreal (CA); and Syed Muhammad Yousaf Hashmy, Tempe, AZ (US)
Assigned to Arizona Board of Regents on behalf of Arizona State University, Scottsdale, AZ (US)
Filed by Qiushi Cui, Tempe, AZ (US); Yang Weng, Chandler, AZ (US); Khalil El-Arroudi, Montreal (CA); and Syed Muhammad Yousaf Hashmy, Tempe, AZ (US)
Filed on Jun. 10, 2020, as Appl. No. 16/897,542.
Claims priority of provisional application 62/859,929, filed on Jun. 11, 2019.
Prior Publication US 2020/0393505 A1, Dec. 17, 2020
Int. Cl. G01R 31/08 (2020.01); G01R 21/06 (2006.01); H02H 1/00 (2006.01); H02H 7/22 (2006.01); H02H 3/38 (2006.01); H02H 3/52 (2006.01)
CPC G01R 31/085 (2013.01) [G01R 21/06 (2013.01); H02H 1/0007 (2013.01); H02H 3/387 (2013.01); H02H 7/22 (2013.01); H02H 1/0092 (2013.01); H02H 3/52 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A high impedance fault (HIF) detector, comprising:
a system characteristic averager configured to store instantaneous power characteristic values and provide averaged power characteristic values of the instantaneous power characteristic values;
a decision circuit configured to determine occurrence of an HIF based on the instantaneous power characteristic values and the averaged power characteristic values; and
a Kalman filter configured to provide a first portion of the instantaneous power characteristic values to the system characteristic averager after filtering a received voltage signal and a received current signal, wherein the first portion of the instantaneous power characteristic values comprises at least one of an estimated in-phase component of a third harmonic of the received voltage signal (KFVa cos HV3, KFVb cos HV3, or KFVc cos HV3) or an estimated in-quadrature component of a third harmonic of the received voltage signal (KFVa sin HV3, KFVb sin HV3, or KFVc sin HV3);
wherein KF is a Kalman Filter coefficient, va is defined by a voltage of phase A, vb is defined by a voltage of phase B, and vc is defined by a voltage of phase C.