Functions
2.5 Power System Data 1
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
59
Measuring Transducer 1
Measuring transducer 1 is provided for DC voltage/DC current protection or the rotor earth fault protection with
1 to 3 Hz (U
Control
). Depending on the application, select at address 295 TRANSDUCER 1 one of the alternatives
10 V, 4-20 mA or 20 mA. In the first case, the measuring range is between –10 V and +10 V. The 4-20 mA
interface is designed for operation with sign, i.e. a current of 12 mA corresponds to an input value of 0. Currents
below 2 mA indicate wire break. The disturbance indication drops out at currents above 3 mA. If the alternative
20 mA is selected, the measuring range is between –20 mA and + 20 mA.
Figure 2-11 Relationship between measured quantity and represented input value at measuring transducer
TD 1 with setting 4-20 mA
Measuring Transducer 2
Measuring transducer 2 is provided for overload protection or the rotor earth fault protection at 1 to 3 Hz (U
Meas
).
In combination with an (external) temperature sensor and measuring transducer, it allows input of an ambient
or coolant temperature. It is matched to the upstream measuring transducer by selecting at address 296
TRANSDUCER 2 one of the standard alternatives 10 V, 4-20 mA or 20 mA.
Measuring Transducer 3
Measuring transducer 3 is provided for underexcitation protection and is therefore designed for voltage input
(10 V). The excitation voltage is fed to the measuring transducer via a voltage divider. Where the excitation DC
voltage may contain excessive harmonics (e.g. owing to thyristor control), the integrated digital filter should be
used; it is selected at the address 297 TRANSDUCER 3 by setting with filter.
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