Overview
The “Stator ground fault protection 100 % (20 Hz)” function works with an injected 20-Hz voltage into the generator neutral point. It detects ground faults in the stator winding of generators connected to the electrical power system via a generator transformer, and also ground faults in the entire winding range (100%) including the machine neutral point.
For more detailed information on “Stator ground fault protection 100 % (20 Hz)” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Setting Parameters
General setting parameters
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:2311:106 | General:I20< supervision | 1 A @ 1.6 Irated | 0.005 A to 0.040 A | 0.010 A |
| 5 A @ 1.6 Irated | 0.025 A to 0.200 A | 0.050 A | ||
| _:2311:107 | General:V20< supervi- sion | 0.300 V to 14.723 V | 1.732 V | |
| _:2311:101 | General:Correction angle | -60.00 ° to 60.00 ° | 0.00 ° | |
| _:2311:103 | General:Transf. Resis- tance Rps | 0.000 Ω to 700.000 Ω | 0.000 Ω | |
| _:2311:110 | General:Sec./prim. factor R SGF | 1.00 to 200.00 | 37.00 | |
| _:2311:1 | General:RL-parallel acti- vate | no yes |
no | |
| _:2311:104 | General:RL-parallel | 20.000 Ω to 700.000 Ω | 20.000 Ω | |
| _:2311:15 | General:Correction factor RL-par. | -0.100 to 0.100 | 0.000 | |
Setting parameters for Stage R(20 Hz)
| Addr. | Parameter | C | Setting Options | Default Setting |
| R(20Hz)< 1 | ||||
| _:17011:1 | R(20Hz)< 1:Mode | off on test |
off | |
| _:17011:2 | R(20Hz)< 1:Operate & flt.rec. blocked | no yes |
yes | |
| _:17011:3 | R(20Hz)< 1:Threshold | 20.000 Ω to 700.000 Ω | 100.000 Ω | |
| _:17011:6 | R(20Hz)< 1:Operate delay | 0.00 s to 60.00 s | 10.00 s | |
| R(20Hz)< 2 | ||||
| _:17012:1 | R(20Hz)< 2:Mode | off on test |
off | |
| _:17012:2 | R(20Hz)< 2:Operate & flt.rec. blocked | no yes |
no | |
| _:17012:3 | R(20Hz)< 2:Threshold | 20.000 Ω to 700.000 Ω | 20.000 Ω | |
| _:17012:6 | R(20Hz)< 2:Operate delay | 0.00 s to 60.00 s | 1.00 s | |
Setting parameters for Stage I(RMS)
| Addr. | Parameter | C | Setting Options | Default Setting |
| I(RMS)> 1 | ||||
| _:17041:1 | I(RMS)> 1:Mode | off on test |
off | |
| _:17041:2 | I(RMS)> 1:Operate & flt.rec. blocked | no yes |
no | |
| _:17041:3 | I(RMS)> 1:Threshold | 1 A @ 1.6 Irated | 0.020 A to 1.500 A | 0.400 A |
| 5 A @ 1.6 Irated | 0.100 A to 7.500 A | 2.000 A | ||
| _:17041:6 | I(RMS)> 1:Operate delay | 0.00 s to 60.00 s | 1.00 s | |
Logic Diagrams & highlights
Basic Principle of Voltage Injection into the Generator Neutral Point
Connection of the Stator Ground-Fault Protection 100 % (20 Hz) with Grounding Transformer or Neutral-Point Transformer
System Configuration with Parallel Load Resistor
Logic Diagram of the Functionality Across Stages
Logic Diagram of an R(20 Hz)< Stage
Required calculations
Connection of the Stator Ground-Fault Protection 100 % (20 Hz) on a Primary Load Resistor
Logic Diagram of an I(RMS)> Stage
