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ALSTOM - MiCOM Alstom P547

MiCOM Alstom P547’s simple protection principle and scheme enables fast fault clearance times. Interfacing with the Power Line Carrier equipment, which operates via the power line, means that the end-to-end scheme communication requires no external signalling channel.

VT inputs may be added to enhance protection stability and sensitivity in long line applications, and where single pole tripping is required. Adding voltage inputs supports distance protection and fault location and enhances other P547 functions.

Basic description:

  • Comprehensive phase comparison line protection: unit protection, subcycle distance and directional earth fault (DEF)
  • Single and three pole tripping applications
  • Adapted to two and three-terminal lines, and lines with transformer tee-off feeds
  • Highly selective unit protection 
  • Cost effective alternative to current differential
  • The signalling medium is the power line itself - fully within the maintenance and operational control of the utility, no external communications dependence
  • Advanced charging current compensation and angle-shifting to avoid corona issues - design features to target long-line transmission applications
  • Adaptive mixing of sequence components boosts earth fault sensitivity without compromising detection of phase-phase and three-phase faults
  • IEC 61850 redundant Ethernet, supporting self healing ring, RSTP, dual homing or PRP
  • Optional mho and quadrilaterial subcycle distance protection
  • Full suite of monitoring, control and recording capabilities plus fault locator, autoreclose and check synchronism





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