The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 31, 2015
Filed:
Nov. 15, 2011
Frank Brenk, Hausach, DE;
Franz-otto Witte, Teningen, DE;
Wolfram Strepp, Freiburg, DE;
ABB AG, Mannheim, DE;
Abstract
Exemplary methods are directed to insulation monitoring of non-grounded electrical DC power supply systems and AC power supply systems which have a resistive (R) and capacitive (C) insulation impedance between the power supply system and ground. The method includes applying a pulsed AC voltage (U) having alternately different pulsed voltage values to the power supply system to be monitored via a resistive system interface (R) between the power supply system and ground. The insulation impedance (R) between the power supply system and ground is determined using time profiles of transient processes of the measurement voltage (V) prior to transient recovery of the power supply system to the respective pulsed voltage value (U) of two polarity-inverted pulsed voltage value application processes.