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  • Users: Zahi1
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  1. Zahi1

    Overall Cable and Transformer Differential Protection

    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...
  2. Zahi1

    Current Transformer Rating

    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.

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