Thanks for the feedback, I have checked the relay ordering number against the catalogue sheets given in the link. The relay has the provision to be used in the same application with an optional function of having a power transformer in the protected zone and that has to be specified during...
We are using Siemens 7SD522 relays (V4.6) for the overall differential of a transformer cable feeder. The protected zone consists of a 66kV power cable (~580m length) and a 50/60 MVA, 66/11KV, YnD1 power transformer. The protection topology consists of one 7SD522 relay at each end of the...
Hello,
What does it mean for a current transformer to be ext. 100%? Does that mean it allows for a continuous current of double it's rated current without any damage?
Thanks.
