Siemens 7SA522 Distance Relay Setting
Siemens 7SA522 Distance Relay Setting
(OP)
Hello everyone,
I have an existing Quadramho relay setting (21 function). It has Zone 3 setting as forward and reverse (offset) settings. It gives me Offset Mho option to set. Now I need to transfer the same setting to a new Siemens 7SA522 relay.
Question: What would be the best way to set Zone 3 forward and reverse in the 7SA522 relay? 7SA522 does not provide Offset mho option. Thanks for any suggestions/ideas.
I have an existing Quadramho relay setting (21 function). It has Zone 3 setting as forward and reverse (offset) settings. It gives me Offset Mho option to set. Now I need to transfer the same setting to a new Siemens 7SA522 relay.
Question: What would be the best way to set Zone 3 forward and reverse in the 7SA522 relay? 7SA522 does not provide Offset mho option. Thanks for any suggestions/ideas.






RE: Siemens 7SA522 Distance Relay Setting
RE: Siemens 7SA522 Distance Relay Setting
Thanks for your comments. Is there any added benefit if I set to quad instead of mho? I know that in quad you get more resistive coverage, but if I don't need that, can just set to mho characteristics for both reverse and forward zones? Or it's the quad characteristics that would be somewhat closer to offset?
RE: Siemens 7SA522 Distance Relay Setting
The classical setting is zone 1,2 and 3 forward. You can do it with 7SA522.
ref:Numerical distance protection - Gerhard Ziegler -Siemens book -
fig.24-pag. 32 - 1999
RE: Siemens 7SA522 Distance Relay Setting
RE: Siemens 7SA522 Distance Relay Setting
The classical setting is zone 1,2 and 3 forward. You can do it with 7SA522
using MHO characteristics,.
ref:Numerical distance protection - Gerhard Ziegler -Siemens book -
fig.24-pag. 32 - 1999