Table of Contents

 1     Scope          
 2     References
 3     Definitions 
        3.1     Terms defined elsewhere        
        3.2     Terms defined in this Recommendation            
 4     Abbreviations and acronyms             
 5     Conventions             
 6     Earth potential rise in electric power systems            
 7     Metallic transfer of EPR       
        7.1     Description of metallic transfer and influences on telecommunications              
        7.2     Calculation of metallic transfer               
        7.3     Transfer of the EPR by power lines      
        7.4     Transfer of the EPR due to an HV fault
        7.5     Transfer of the EPR due to an MV fault and influence on customer premises   
 8     Mitigation techniques          
        8.1     Protecting telecommunication lines serving LV installations (MV faults)              
Annex A – Techniques for calculating the EPR in electric power systems    
        A.1     Network parameters affecting the EPR             
        A.2     Techniques for calculating the EPR      
Appendix I – Calculation of fault current distribution    
Appendix II – Through tower earthing during power line faults    
       II.1     Equivalent circuit of the earth wire with earth return   
       II.2     Solution of the circuit  
       II.3     Example of application               
Appendix III – Impedance to earth of MV/LV transformer stations    
      III.1     Types of measured transformer stations           
      III.2     Measurement method              
      III.3     Results of the measurements
      III.4     Conclusions    
Appendix IV – Transferred voltage and current by means of LV neutral conductors    
       IV.1     System modelling, options and parameters    
       IV.2     Feeding of the neutral-to-earth loop 
       IV.3     Voltage and current profiles vs. length of the neutral 
Appendix V – Input impedance of the LV neutral-to-earth loop    
       VI.1     Problem identification              
       VI.2     Study of the relative importance of the network parameters and conditions  
       VI.3     Main conclusions        
Appendix VII – Screening factor of a power cable with an imperfectly earthed sheath    
      VII.1     Criterion for long cables           
      VII.2     Short (finite length) cable sheaths with continuous earthing  
      VII.3     Screening factor of a power cable with an insulating cover      
      VII.4     Screening factors for non-uniform lines           
Appendix VIII – Screening factors of telecommunication cables with imperfectly earthed sheaths    
     VIII.1     Telecommunication cables affected by longitudinal induction
     VIII.2     Telecommunication cables affected by EPR    
Bibliography