Overview
The “Rotor ground fault protection (Rgnd<, fn)” function monitors the rotor circuit of electrical synchronous machines (generator, motor) for a ground fault, and the rotor circuit of asynchronous machines for a ground fault if the rotor circuit is accessible via a slip ring. It detects faults by injecting a rated-frequency voltage into a rotor circuit and monitoring the rotor ground current.
For more detailed information on “Rotor ground fault protection (Rgnd<, fn)” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Setting Parameters
Setting parameters for Rotor ground fault protection (Rgnd<, fn)
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:2311:109 | General:Supervision | off on |
on | |
| _:2311:106 | General:I< supervision | 1.0 mA to 50.0 mA | 2.0 mA | |
| _:2311:101 | General:Correction angle | -1500 ° to 1500 ° | 0 ° | |
| _:2311:103 | General:X-coupling | -100 Ω to 800 Ω | 398 Ω | |
| _:2311:104 | General:R-coupling | 0 Ω to 999 Ω | 50 Ω | |
| _:2311:108 | General:V-RGF external source | no yes |
no | |
| RGF resistance 1 | ||||
| _:15961:1 | RGF resistance 1:Mode | off on test |
off | |
| _:15961:2 | RGF resistance 1:Operate & flt.rec. blocked | no yes |
yes | |
| _:15961:3 | RGF resistance 1:Threshold | 1.0 kΩ to 30.0 kΩ | 10.0 kΩ | |
| _:15961:6 | RGF resistance 1:Operate delay | 0.00 s to 60.00 s | 10.00 s | |
| _:15961:7 | RGF resistance 1:Dropout delay | 0.00 s to 60.00 s | 0.00 s | |
| RGF resistance 2 | ||||
| _:15962:1 | RGF resistance 2:Mode | off on test |
off | |
| _:15962:2 | RGF resistance 2:Operate & flt.rec. blocked | no yes |
no | |
| _:15962:3 | RGF resistance 2:Threshold | 1.0 kΩ to 30.0 kΩ | 2.0 kΩ | |
| _:15962:6 | RGF resistance 2:Operate delay | 0.00 s to 60.00 s | 0.50 s | |
| _:15962:7 | RGF resistance 2:Dropout delay | 0.00 s to 60.00 s | 0.00 s | |
Logic Diagrams & highlights
Connecting the Rotor and Measuring the Rotor Ground Current, 7XR61
Connecting the Rotor and Measuring the Rotor Ground Current, 7XR81
Logic Diagram of General Functionalities
Logic Diagram of the Rotor Ground-Fault Protection Stage (RRgnd<, fn)
