公开(公告)号：US20200059080A1

公开(公告)日：2020-02-20

申请号：US16513707

申请日：2019-07-17

Applicant: ABB Schweiz AG

Inventor： Darshit Prajapati ,  Dinesh V ,  Nayan Shah ,  Pravin Vadhiyar ,  Vijay Shah

IPC: H02H1/00 ,  G01R15/18

Abstract: The present disclosure relates to a method of integration and compensation in a protection relay. The method may include the protection relay: receiving a measured signal from a Rogowski coil and converting the measured signal to digitized samples, where the measured signal is a differentiated current signal over time; iteratively computing integrated current data from the digitized samples using a first digitized function to obtain integrated value; iteratively computing a compensated current data from the integrated current data using a second digitized function to remove a DC component in the integrated current data; evaluating the compensated current data to identify a fault condition; generating a trip signal on identification of a fault condition to operate a switch to electrically disconnect to protect the power equipment. The steps of integration and compensation may be performed in time window that is within the time period of the measured signal.

公开(公告)号：US11276997B2

公开(公告)日：2022-03-15

申请号：US16513707

申请日：2019-07-17

Applicant: ABB Schweiz AG

Inventor： Darshit Prajapati ,  Dinesh V ,  Nayan Shah ,  Pravin Vadhiyar ,  Vijay Shah

IPC: H02H3/00 ,  H02H1/00 ,  G01R15/18 ,  H02H3/08

Abstract: The present disclosure relates to a method of integration and compensation in a protection relay. The method may include the protection relay: receiving a measured signal from a Rogowski coil and converting the measured signal to digitized samples, where the measured signal is a differentiated current signal over time; iteratively computing integrated current data from the digitized samples using a first digitized function to obtain integrated value; iteratively computing a compensated current data from the integrated current data using a second digitized function to remove a DC component in the integrated current data; evaluating the compensated current data to identify a fault condition; generating a trip signal on identification of a fault condition to operate a switch to electrically disconnect to protect the power equipment. The steps of integration and compensation may be performed in time window that is within the time period of the measured signal.