ND 10- 09 / 1 Us er's m anua l 41 2Fig. 1. Meter fittingFig. 2. Meter dimensions5 METER DESCRIPTION5.1 Current in putsAll current inputs are galvanically isolated (internal current transformers). The meter is suited to operatetogether with external measuring current transformers. Displayed values of currents as well as theirderivative values are automatically calculated using set ratio value of the external transformer. Currentinputs are specified in the order as either 1 A or 5 A.5.2 Voltage inputsDisplayed values of voltages as well as their derivative values are automatically calculated using set ratiovalue of the external transformer. Voltage inputs are specified in the order as either 3 x 57.7/100 V, 3 x230/400 V or 3 x 290/500 V.