公开(公告)号：US10908186B2

公开(公告)日：2021-02-02

申请号：US16066610

申请日：2016-12-09

Applicant: ABB Power Grids Switzerland AG

Inventor： Håkan Westerlund ,  Lennart Stenström

IPC: G01R15/18 ,  H02H1/00 ,  H02H9/04

Abstract: A monitoring arrangement for monitoring a surge arrester which is connected to a live wire of a power network at a connection point in order to protect an electrical apparatus against incoming surges, the monitoring arrangement including: an analogue measuring circuit for sensing a current impulse through the surge arrester caused by an incoming surge in the live wire and producing a corresponding analogue measuring signal; an analog-to-digital converter for converting the measuring signal into digital signals; and an electronic processing device configured: to establish, based on the digital signals, a voltage peak value representing the highest voltage at the connection point during the incoming surge; and to establish, based on the voltage peak value and by means of a calculation model or look-up table, a maximum-voltage value representing an estimated maximum voltage across the electrical apparatus during the incoming surge.

公开(公告)号：US20200271695A1

公开(公告)日：2020-08-27

申请号：US16066610

申请日：2016-12-09

Applicant: ABB Power Grids Switzerland AG

Inventor： Håkan Westerlund ,  Lennart Stenström

IPC: G01R15/18 ,  H02H1/00 ,  H02H9/04

Abstract: A monitoring arrangement for monitoring a surge arrester which is connected to a live wire of a power network at a connection point in order to protect an electrical apparatus against incoming surges, the monitoring arrangement including: an analogue measuring circuit for sensing a current impulse through the surge arrester caused by an incoming surge in the live wire and producing a corresponding analogue measuring signal; an analog-to-digital converter for converting the measuring signal into digital signals; and an electronic processing device configured: to establish, based on the digital signals, a voltage peak value representing the highest voltage at the connection point during the incoming surge; and to establish, based on the voltage peak value and by means of a calculation model or look-up table, a maximum-voltage value representing an estimated maximum voltage across the electrical apparatus during the incoming surge.