Patent ID: 6807495
Filing Date: 2004-10-19
Classification: H02H

Abstract:
A method for the plausibility checking of voltage transformers in an electrical switchgear, in particular a high or medium voltage switchgear, the switchgear being controlled by a control system and measured signals from voltage transformers arranged at least two different measuring points being processed by the control system, wherein for testing the plausibility of the voltage transformersa) an instantaneous topology of the switchgear is recorded by means of the control system based on the existing electrical connections of primary devices and based on the instantaneous positions of switches, b) based on the instantaneous topology, at least one sub-area of the switchgear is identified, which comprises at least two galvanically connected voltage transducers, c) within the sub-area the voltage transformers are divided into groups based on their measured signals, all of the measured signals in each group coinciding with one another within the tolerated measuring inaccuracies, and d) an indication or alarm signal is generated by the control system if more than one group is present.