Section 4 Requirements for measurement transformers..............169
Current transformers...................................................................... 169
Current transformer requirements for non-directional
overcurrent protection................................................................169
Current transformer accuracy class and accuracy limit
factor.................................................................................... 169
Non-directional overcurrent protection................................. 170
Example for non-directional overcurrent protection..............171
Section 5 Protection relay's physical connections........................173
Inputs..............................................................................................173
Energizing inputs....................................................................... 173
Phase currents..................................................................... 173
Residual current................................................................... 173
Residual voltage...................................................................173
Phase voltage.......................................................................174
Auxiliary supply voltage input.................................................... 174
Binary inputs..............................................................................174
Outputs........................................................................................... 175
Outputs for tripping and controlling............................................175
Outputs for signalling.................................................................176
IRF.............................................................................................177
Section 6 Glossary....................................................................... 179
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