Overview
The “Impedance protection” function protects transformers as backup protection for transformer differential protection. It is used as a backup protection for the transformer, and the generator in the block units of power stations and functions as backup protection in the event of energy recovery to faults in the upstream electrical power system beyond a transformer.
For more detailed information on “Impedance protection” 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 Impedance protection function
| Addr. | Parameter | C | Setting Options | Default Setting |
| General | ||||
| _:2311:1 | General:Mode | off on test |
on | |
| _:2311:102 | General:Loop selection | All loops Current-dependent |
All loops | |
| _:2311:103 | General:Min. phase- current thresh | 1 A @ 100 Irated | 0.030 A to 35.000 A | 0.100 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 0.50 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 0.100 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 0.50 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 0.100 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 0.500 A | ||
| _:2311:104 | General:Overcurrent threshold | 1 A @ 100 Irated | 0.030 A to 35.000 A | 1.300 A |
| 5 A @ 100 Irated | 0.15 A to 175.00 A | 6.50 A | ||
| 1 A @ 50 Irated | 0.030 A to 35.000 A | 1.300 A | ||
| 5 A @ 50 Irated | 0.15 A to 175.00 A | 6.50 A | ||
| 1 A @ 1.6 Irated | 0.001 A to 1.600 A | 1.300 A | ||
| 5 A @ 1.6 Irated | 0.005 A to 8.000 A | 6.500 A | ||
| _:2311:105 | General:Undervoltage seal in | no yes |
no | |
| _:2311:106 | General:V-seal-in threshold | 0.300 V to 340.000 V | 80.019 V | |
| _:2311:107 | General:Duration of V- seal-in time | 0.00 s to 60.00 s | 4.00 s | |
| TZ 1 | ||||
| _:15301:1 | TZ 1:Mode | off on test |
on | |
| _:15301:2 | TZ 1:Operate & flt.rec. blocked | no yes |
no | |
| _:15301:27 | TZ 1:Blk. w. inrush curr. detect. | no yes |
no | |
| _:15301:102 | TZ 1:X reach (ph-g) | 1 A | 0.100 Ω to 600.000 Ω | 2.500 Ω |
| 5 A | 0.020 Ω to 120.000 Ω | 0.500 Ω | ||
| _:15301:103 | TZ 1:X reach (ph-ph) | 1 A | 0.100 Ω to 600.000 Ω | 2.500 Ω |
| 5 A | 0.020 Ω to 120.000 Ω | 0.500 Ω | ||
| _:15301:104 | TZ 1:R reach (ph-g) | 1 A | 0.100 Ω to 600.000 Ω | 2.500 Ω |
| 5 A | 0.020 Ω to 120.000 Ω | 0.500 Ω | ||
| _:15301:105 | TZ 1:R reach (ph-ph) | 1 A | 0.100 Ω to 600.000 Ω | 1.250 Ω |
| 5 A | 0.020 Ω to 120.000 Ω | 0.250 Ω | ||
| _:15301:109 | TZ 1:Directional mode | non-directional forward reverse |
reverse | |
| _:15301:6 | TZ 1:Operate delay | 0.00 s to 60.00 s; ∞ | 0.30 s | |
Logic Diagrams & highlights
Transformation of a 2-Phase Short-Circuit Current
Transformation of a 1-Phase Short-Circuit Current
Impedance Measurement with a 2-Phase Short Circuit
Impedance Measurement with a 1-Phase Short Circuit
Effective Parameter for Loop Release for All Loops
Effective Parameter in Current-Dependent Loop Release
Direction-Characteristic Curve in the R-X Diagram
Operate Curve with Quadrilateral Characteristic
Example of a Network Protection Application
System Configuration and Possible Time Grading
System Configuration and Possible Time Grading
