Phase overcurrent supervisory element (50) associated – with current-based, Elements that schemes connect the GSU where the scheme is transformer(s) to the capable of tripping Transmission system for loss of that are used communications exclusively to export installed on the The overcurrent element shall be set greater than 130% of the energy directly from high-side of the 1.0 per unit of the line nominal calculated current derived from the maximum aggregate a BES generating unit 18 GSU transformer or voltage nameplate MVA output at rated power factor (including the or generating plant. Phase time Mvar output of any static or dynamic reactive power devices) Elements may also overcurrent relay supply generating (51) installed on – plant loads. – the high-side of the connected to GSU transformer asynchronous generators only If the relay is (including installed on the based installations) generator-side of the GSU transformer use Option 11 The same application continues on the next page with a different relay type
Elements that connect the GSU transformer(s) to the Transmission system that are used exclusively to export energy directly from a BES generating unit or generating plant. Elements may also supply generating plant loads. – connected to asynchronous generators only (including installations) Phase overcurrent supervisory element (50) – associated with current-based, schemes where the scheme is capable of tripping for loss of communications installed on the high-side of the GSU transformer or Phase time overcurrent relay (51) – installed on the high-side of the GSU transformer If the relay is installed on the generator-side of the GSU transformer use Option 11 18 1.0 per unit of the line nominal voltage The overcurrent element shall be set greater than 130% of the calculated current derived from the maximum aggregate nameplate MVA output at rated power factor (including the Mvar output of any static or dynamic reactive power devices) The same application continues on the next page with a different relay type based
PRC_025_2_Generator_Relay_Loadability_Draft_2017_05_23.docx