Transmission Line Monitoring and Rating


This seminar explores the process of placing and analyzing line monitor data to yield accurate static and dynamic line thermal capacity. Includes analysis of ambient-adjusted line rating methods of improving line safety when used. Comparison of monitoring devices and their reliability is a key part of the seminar.


  Introductions & Discussion
  • Instructor background & experience
  • Student interest and experiences in Line Monitoring
  • Quiz questions
  Overview of Dynamic Ratings (IEEE Tutorial)
  • Thermal heat balance calculation -- I vs Tc
  • Conductor temperature limits
  • Line ratings – static & dynamic
  • What monitors exist
  • Weather, conductor temperature or sag-tension
  • Integration into system operations
  Static and Dynamic Line Ratings
  • Static Ratings
      - Continuous
    - Emergency
    - Transient (less than 30 min)
  • Dynamic Ratings
      - Comparison to Static
    - Integration into Operations
    - Prediction, volatility, and duration
  Field Monitors for Dynamic Line Ratings
  • Weather instruments
      - Solar Pyranometer
    - Air Temp Sensor
    - Anemometers
  • Temperature monitors
      - Power donuts
    - EPRI Monitor
    - Vibrec & Micca
  Field Monitors for Dynamic Line Ratings (cont)
  • Sag-tension Monitors
      - CAT-1 Tension Monitors
    - Sagometer
    - Promethean B Field Sensors
  • Vibration Monitors
  Conductor Temp For LiDAR & Ground Survey
  • Based on Weather Monitors
  • Based on multiple anemometers
  • Based on Conductor Temp Measurement
      - Position of conductor in space
    - Temperature for LiDAR
  Selection of Line Rating Weather Assumptions
  • CIGRE TB 299
  • Thermal elongation rate uncertainty
      - Tension sharing between AL and ST strands in ACSRe
  • Weather conditions
      - Low speed wind
    - Solar heating
  • OHLOAD Approach
  Future Developments