The numerical Distance Protection SIPROTEC® 7SA6 is equipped with a powerful 32 Bit microprocessor. This provides fully numerical processing of all functions in thedevice, from the acquisition of the measured values up to the output of commands tothe circuit breakers. Figure 1-1 shows the basic configuration of the device.
The measuring inputs MI transform the currents and voltages derived from theinstrument transformers and match them to the internal signal levels for processing inthe device.
The device has 4 current and 4 voltage inputs. Three current inputs are
provided for measurement of the phase currents, a further measuring input (I4)may
be configured to measure the earth current (residual current from the current
transformer star-point), the earth current of a parallel line (for parallel line
compensation) or the star-point current of a power transformer (for earth fault direction
determination).
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