Overview
The “Echo and tripping in the event of weak infeed” is used to support the teleprotection method for distance protection and ground-fault protection. Its use is only advisable, therefore, if you are using an appropriate teleprotection method.
For more detailed information on “Echo and tripping in the event of weak infeed” function, refer to SIPROTEC 5 devices, V8.30 & higher manuals.
To see other supported functions, click here.
Structure/Embedding of the Function
Function Blocks
Setting Parameters
Setting parameters for Echo and tripping in the event of weak infeed Function
| Addr. | Parameter | C | Setting Options | Default Setting |
| Weak infeed | ||||
| _:5821:101 | Weak infeed:Echo block time after Tx | 0.00 s to 60.00 s | 0.05 s | |
| _:5821:102 | Weak infeed:Echo and operate delay | 0.00 s to 60.00 s | 0.04 s | |
| _:5821:103 | Weak infeed:Echo pulse | 0.00 s to 60.00 s | 0.05 s | |
| _:5821:104 | Weak infeed:Weak infeed action | off only WI operate only echo echo and WI operate |
only echo | |
| _:5821:105 | Weak infeed:85-21/67N common chan. | no yes |
no | |
| _:5821:106 | Weak infeed:Under- voltage threshold | 0.300 V to 200.000 V | 25.000 V | |
| _:5821:108 | Weak infeed:CB closed on I=0 | no yes |
no | |
Logic Diagrams & highlights
Release Logic for the Echo Function with Distance Protection
Release Logic for the Echo Function with Ground-Fault Protection
Logic Diagram for the Echo Function
Logic of the 1-Channel Coordinator
Detection of Weak Infeed for Phase-to-Ground Voltages (Grounded Systems)
Detection of Weak Infeed for Phase-to-Phase Voltages (Isolated or Resonant-Grounded Systems)
Release Logic for Tripping on Weak Infeed
