The phase current inputs to the relay are measured by the three-phase current measurement function CMMXU1/2. The current input is connected to the X120 card in the back panel. The sequence current measurement CSMSQI1/2 measures the sequence current and the residual current measurement RESCMMXU1 measures the residual current.
The three-phase bus side phase voltage inputs to the relay are measured by the three-phase voltage measurement VMMXU1. The voltage input is connected to the X130 card in the back panel. The sequence voltage measurement VSMSQI1 measures the sequence voltage and the residual voltage measurement RESVMMXU1 measures the residual voltage.
The measurements can be seen in the LHMI and they are available under the measurement option in the menu selection. Based on the settings, function blocks can generate low alarm or warning and high alarm or warning signals for the measured current values.
The frequency measurement FMMXU1 of the power system and the three-phase power and energy measurement PEMMXU1 are available. Load profile record LDPRLRC1 is included in the measurements sheet. LDPRLRC1 offers the ability to observe the loading history of the corresponding bay. FLTRFRC1 is used to record the monitored data during the fault condition. The records enable the analysis of recent power system events.