The invention relates to a method, a computer program product, a computer program and a device (20) for the plausibility checking of voltage transformers (8) in an electrical switchgear (1) as well as a switchgear (1) with such a device (20). According to the invention, a topological sub-area (1a; 1b) with several galvanically connected voltage transformers (8) is recorded for an instantaneous topology of the switchgear (1), groups of voltage transformers (8) with the same measured signals are identified and, if more than one group is present, an indication or alarm signal is generated by the substation control system (2). Amongst other things, exemplary embodiments relate to: Criteria for the production of warning or alarm messages for problematic voltage transformers (8) and/or sub-areas (1a; 1b); presentation of the results of the plausibility test; coordination of the plausibility test with switching operations. Advantages are, amongst others: Method independent of complexity and operating state of the switchgear (1); dynamic tracking of the topology; high meaningfulness of the plausibility test; and use of measured voltage values already available in the control system (2).