Section 1 Introduction1.1 This manual GUID-AB423A30-13C2-46AF-B7FE-A73BB425EB5F v19The application manual contains application descriptions and setting guidelinessorted per function. The manual can be used to find out when and for what purposea typical protection function can be used. The manual can also provide assistancefor calculating settings.1.1.1 Presumptions for Technical Data GUID-1E949E38-E04D-4374-A086-912C25E9F93C v2The technical data stated in this document are only valid under the followingcircumstances:1. Main current transformers with 1 A or 2 A secondary rating are wired to theIED 1 A rated CT inputs.2. Main current transformer with 5 A secondary rating are wired to the IED 5 Arated CT inputs.3. CT and VT ratios in the IED are set in accordance with the associated maininstrument transformers. Note that for functions which measure an analoguesignal which do not have corresponding primary quantity the 1:1 ratio shall beset for the used analogue inputs on the IED. Example of such functions are:HZPDIF, ROTIPHIZ and STTIPHIZ.4. Parameter IBase used by the tested function is set equal to the rated CTprimary current.5. Parameter UBase used by the tested function is set equal to the rated primaryphase-to-phase voltage.6. Parameter SBase used by the tested function is set equal to:• √3 × IBase × UBase7. The rated secondary quantities have the following values:• Rated secondary phase current Ir is either 1 A or 5 A depending onselected TRM.• Rated secondary phase-to-phase voltage Ur is within the range from 100V to 120 V.• Rated secondary power for three-phase system Sr = √3 × Ur × Ir8. For operate and reset time testing, the default setting values of the function areused if not explicitly stated otherwise.9. During testing, signals with rated frequency have been injected if not explicitlystated otherwise.1MRK 505 393-UEN B Section 1IntroductionLine differential protection RED650 2.2 IEC 17Application manual
