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ALSTOM - MiCOM Alstom P74x

MiCOM Alstom P74x (P741,P742,P743):  High Performance Busbar Protection 
MiCOM Alstom P74x numerical busbar protection scheme provides complete protection for all voltage levels. One of the fastest and most complete in its class, the MiCOM 74x provides secure and sensitive protection for all types of voltage busbar configurations. 

Basic description:

  • Provides secure and sensitive protection for all types of busbar configurations, at all voltage levels 
  • Engineered to provide a centralised or a distributed architecture 
  • Includes CT saturation detection and dynamic topology processing algorithms 
  • Fast reset (less than 1 cycle) circuit breaker failure element
  • Interoperable with all classes of CT: IEEE, IEC, air-gapped, non-gapped - and CTs with moderate knee point voltage 
  • IEC 61850 redundant Ethernet, supporting self healing ring, RSTP, dual homing or PRP 
  • True subcycle busbar protection - transmission class security and dependability
  • Typical operating time of 8ms with high speed/high break (HSHB) contacts, 13ms with standard contacts 
  • Sensitive earth fault elements improve detection of resistive or arcing faults 
  • Phase segregated biased current differential high speed busbar protection 
  • Easy maintenance, operation and future expansion of the busbar supported 
  • Up to 28 peripheral units supported - scalable busbar solutions from medium to large substations





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