Analog Signals - ABB Relion Technical Manual

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Analog signals

Up to 40 analog signals can be selected for recording by the Disturbance recorder and

triggering of the Disturbance report function. Out of these 40, 30 are reserved for external

analog signals from analog input modules via preprocessing function blocks (SMAI) and

summation block (3PHSUM). The last 10 channels may be connected to internally

calculated analog signals available as function block output signals (phase differential

currents, bias currents and so on).

External analog

Internal analog signals

IEC05000653 V2 EN

Analog input function blocks

The external input signals will be acquired, filtered and skewed and (after configuration)

available as an input signal on the AxRADR function block via the SMAI function block.

The information is saved at the Disturbance report base sampling rate (1000 or 1200 Hz).

Internally calculated signals are updated according to the cycle time of the specific

function. If a function is running at lower speed than the base sampling rate, Disturbance

recorder will use the latest updated sample until a new updated sample is available.

Application configuration tool (ACT) is used for analog configuration of the Disturbance

The preprocessor function block (SMAI) calculates the residual quantities in cases where

only the three phases are connected (AI4-input not used). SMAI makes the information

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