PLC Line Traps

Line Traps are used in transmission and distribution networks and they are the key components in Power Line Carrier (PLC) systems used for remote control signals, voice communication, remote metering and control between substations in the electrical T&D networks.

Wave traps are used for preventing high frequency signals from going towards undesired directions.




  • Standard : IEC 60353, IEEE Std. C93.4, IEEE Std. 643
  • Manufactured as per desired short circuit capacity
  • Light weight provides ease of mounting
  • Cooling spacers provide lower winding temperature
  • Ease of changing tuning box without dismantling the coil when tuning frequency changes are necessary
  • Availability of installation on capacitive voltage transformers, support insulators or suspension mounting
  • Low stray capacitance and high quality factor (Q)
  • Corona spheres over 245 kV
  • Low, high and double bandwidth
  • Overvoltage protection against short circuit conditions
  • Provision for nearly every type of conductor terminal
  • DIN or NEMA terminal configuration


Selection Details


  • Inductance of Line Trap (mH)
  • Nominal Current (A), at 50 or 60 Hz
  • Short Circuit Current (kA) and duration
  • Blocking frequency range (kHz)
  • Network voltage (kV)
  • Blocking impedance, Zb
  • Resistive component of blocking impedance, Rb
  • Capacitive voltage transformer mounting provision (pedestal) or suspension
  • Connection terminal special requirements (DIN or NEMA)
  • Bird barrier


Nominal Current (A) Standard Short Circuit Currents (kA/1 second) Inductance (mH)
400 10-16 0.10 / 0.20 / 0.315 / 0.4 / 0.50 / 1.00 / 2.00
630 16-20
800 20-25
1000 25-31.5
1250 31.5-40
1600 40-50
2000 50-63


Blocking Bandwidths of Tuning Devices




Band Limits of Wide Band Line Traps



Dimension for Connection and Mounting