Siemens 7SR51 - 2.2 Analogue Inputs

Analogue Inputs
The device functionality is dependent on the analogue input configuration.
Overcurrent devices have 4 CT inputs and directional overcurrent devices have both 4 CT inputs and 4 VT
inputs.
The measuring inputs (current and voltage inputs) for each function are parametrized in the Device
Configuration > CT/VT settings menu, see 3.3 CT and VT Inputs .
The analogue input connections for 7SR5 overcurrent and directional overcurrent devices is summarized in
Figure 2-1.
[dw_7SR5_7SR511DeviceAnalogueInputConnections, 1, en_US]
Figure 2-1 7SR511 Device Analogue Input Connections
The analogue input configuration for 7SR5110 overcurrent devices is summarized in Figure 2-2.
[dw_7SR5_7SR511DeviceCTInputConfiguration, 1, en_US]
Figure 2-2 7SR5110 Device CT Input Configuration
The additional analogue input configuration (VT inputs) for 7SR5111 directional overcurrent devices is
summarized in Figure 2-3.
[dw_7SR5_7SR511DeviceVTInputConfiguration, 1, en_US]
Figure 2-3 7SR5111 Device VT Input Configuration
Interface Between Function Elements and Measuring Inputs
The functions receive the appropriate measuring inputs from the current and voltage transformers as summar-
ized in Figure 2-2 and Figure 2-3.
2.2
Basic Structure of the Device Functionality
2.2 Analogue Inputs
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 29
C53000-G7040-C014-1, Edition 11.2019