Towards a standardisation for digital inputs and outputs of protection functions in IEC 60255 series

Abstract Fully digitalized substations using IEC 61850 process bus are being introduced all over the world. Numerous utilities have featured pilot projects, demonstrators or even industrial scale deployment of these Digital Protection, Automation and Control Systems (FD-PACS). Product standards such as profiles for Instrument Transformers been developed published (IEC 61869-6 61869-9 by TC 38—Instrument Transformers). This raises question about digitally interfaced protection functions. In 2016, 95 (Measuring relays equipment) charged a working group to investigate this subject elaborate recommendations concerning requirements testing IED with digital inputs outputs 60255-1xx series). For functions, publisher/subscriber based data streams supposed comply 61869 standards. holds in particular Sampled Values (SV) representing energising function, is also applicable Generic Object Oriented Substation Event (GOOSE) which can be used input output Quality attributes depend on operational connection status function hosting IED. addition, functions take into account information regarding time synchronisation received SV other parameters. paper gives an overview features proposed way them 60255 standard series. It describes progress WG 2 relates it existing standardization documents.