The relay continuously measures the high voltage (HV) side and the low voltage (LV) side phase currents and the neutral current of the protected transformer. In addition, the relay calculates the symmetrical components of the currents and voltages, maximum current demand value over a user-selectable pre-set time frame, the active and reactive power, the power factor, and the active and reactive energy values. Calculated values are also obtained from the protection and condition monitoring functions of the relay. Depending on the standard configuration, the relay also measures the phase voltages, the residual voltage and the voltage sequence components.
For standard configuration A, B, C and D RTD/mA inputs are offered as an option. By means of the optional RTD/mA module the relay can measure up to eight analog signals such as temperature, pressure and tap changer position values via the six RTD inputs or the two mA inputs using transducers.
For standard configuration E, F, G and H RTD/mA inputs are offered as an option. By means of these inputs the relay can measure up to three analog signals such as temperature, pressure and tap changer position values via the two RTD inputs or the one mA inputs using transducers.
The measured values can be accessed via the local HMI or remotely via the communication interface of the relay. The values can also be accessed locally or remotely using the Web HMI.
The relay is provided with a load profile recorder. The load profile feature stores the historical load data captured at a periodical time interval (demand interval). The records are in COMTRADE format.