1 Introduction
18
7UM61 Manual
C53000-G1176-C127-3
1.1 Overall Operation
The digital Multi-Function Protection SIPROTEC
®
7UM61 is equipped with a high per-
formance microprocessor. All tasks such as the acquisition of the measured values
and issuing of commands to circuit breakers and other switching equipment, are pro-
cessed digitally. Figure 1-1 shows the basic structure of the device.
Analog Inputs The measuring inputs (MI) are galvanically isolated, transform the currents and volt-
ages from the primary transformers and adapt them to the internal processing level of
the device. The device has 4 current and 4 voltage inputs. Three inputs are used on
each side of the protected object for measuring of the phase currents.
Figure 1-1 Hardware Structure of the Digital Machine Protection Device 7UM61 (maximum configuration)
1 current input is equipped with sensitive input transformers (I
EE
) and can measure
secondary currents in the mA range. 3 voltage inputs acquire the phase-to-earth volt-
ages (connection to phase-to-phase voltages and voltage transformers in V connec-
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