Section 4 Analog inputs4.1 IntroductionAnalog input channels must be configured and set properly in order to get correctmeasurement results and correct protection operations. For power measuring and alldirectional and differential functions the directions of the input currents must be definedin order to reflect the way the current transformers are installed/connected in the field( primary and secondary connections ). Measuring and protection algorithms in the IEDuse primary system quantities. Setting values are in primary quantities as well and it isimportant to set the data about the connected current and voltage transformers properly.A reference PhaseAngleRef can be defined to facilitate service values reading. This analogchannels phase angle will always be fixed to zero degrees and all other angle informationwill be shown in relation to this analog input. During testing and commissioning of theIED the reference channel can be changed to facilitate testing and service values reading.The availability of VT inputs depends on the ordered transformer inputmodule (TRM) type.4.2 Setting guidelinesThe available setting parameters related to analog inputs are depending onthe actual hardware (TRM) and the logic configuration made in PCM600.4.2.1 Setting of the phase reference channelAll phase angles are calculated in relation to a defined reference. An appropriate analoginput channel is selected and used as phase reference. The parameter PhaseAngleRefdefines the analog channel that is used as phase angle reference.1MRK 505 337-UUS - Section 4Analog inputs61Application manual
