Section 4 Analog inputs4.1 Introduction SEMOD55003-5 v11Analog input channels must be configured and set properly in order to get correctmeasurement results and correct protection operations. For power measuring, alldirectional and differential functions, the directions of the input currents must bedefined in order to reflect the way the current transformers are installed/connected inthe field ( primary and secondary connections ). Measuring and protection algorithmsin the IED use primary system quantities. Setting values are in primary quantities aswell and it is important to set the data about the connected current and voltagetransformers properly.An AISVBAS reference PhaseAngleRef can be defined to facilitate service valuesreading. This analog channel's phase angle will always be fixed to zero degrees andremaining analog channel's phase angle information will be shown in relation to thisanalog input. During testing and commissioning of the IED, the reference channel canbe changed to facilitate testing and service values reading.The availability of VT inputs depends on the ordered transformer inputmodule (TRM) type.4.2 Setting guidelines SEMOD55068-1 v1SEMOD130348-4 v4The available setting parameters related to analog inputs are dependingon the actual hardware (TRM) and the logic configuration made inPCM600.4.2.1 Setting of the phase reference channel SEMOD55055-5 v3All phase angles are calculated in relation to a defined reference. An appropriateanalog input channel is selected and used as phase reference. The parameterPhaseAngleRef defines the analog channel that is used as phase angle reference.1MRK 505 370-UUS A Section 4Analog inputsBusbar protection REB670 2.2 ANSI 67Application manual
