Abstract
Modern electric power distribution networks require flexible and cost effective solutions for measurement and grid protection purposes. Because conventional instrument transformers cannot always keep up with the changing demands, electronic instrument transformers are increasingly being used for the current and voltage measurements. Due to the different working principle of such sensors, the standardized type test for protection devices should be adapted in order to ensure the electromagnetic immunity, especially during switching operations. This contribution points out the differences between the conventional and the new technology from the EMC point of view. It is shown by measurement that the standardized test procedure is not suitable for protection relays with electronic instrument transformers. The experimental coupling network proposed in this paper is evaluated based on the disturbance voltages occurring at the input terminals of the protection device during real switching operations and the new type test.
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