For some protection applications there can be a need to change the currentoperating level for some time. Therefore there is a possibility to give a setting of amultiplication factor IxMult to the negative sequence current pick-up level. Thismultiplication factor is activated from a binary input signal ENMULTx to thefunction.8.3.3 Setting guidelines GUID-460D6C58-598C-421E-AA9E-FD240210A6CC v3The parameters for Four step negative sequence overcurrent protection NS4PTOCare set via the local HMI or Protection and Control Manager (PCM600).The following settings can be done for the four step negative sequence overcurrentprotection:Operation: Sets the protection to On or Off.Common base IED values for the primary current (IBase), primary voltage (UBase)and primary power (SBase) are set in global base values for settings functionGBASVAL.GlobalBaseSel: Selects the global base value group used by the function to defineIBase, UBase and SBase as applicable.GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4When inverse time overcurrent characteristic is selected, theoperate time of the stage will be the sum of the inverse time delayand the set definite time delay. Thus, if only the inverse time delayis required, it is important to set the definite time delay for thatstage to zero.8.3.3.1 Settings for each step GUID-CFB327EF-C5C4-44B5-AB4B-9C2916355FC5 v5x means step 1, 2, 3 and 4.DirModeSelx: The directional mode of step x. Possible settings are off/nondirectional/forward/reverse.Characteristx: Selection of time characteristic for step x. Definite time delay anddifferent types of inverse time characteristics are available.Table 16:Inverse time characteristicsCurve nameANSI Extremely InverseANSI Very InverseANSI Normal InverseTable continues on next page1MRK 511 407-UEN C Section 8Current protectionPhasor measurement unit RES670 2.2 IEC 143Application manual
