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Line Trap

Line Trap

High voltage transmission lines are used for the transmission of Carrier signals in the frequency range of  30 KHz to 50 KHz for Speech, Data, and Tele – protection. Line traps are used as Band Stop Filters to prevent the loss of these high frequency signals to the sub-station side. The Line Traps are connected in series to the Transmission Line and are designed to carry the rated Power Frequency Current, as well as to withstand the substation fault currents.

  • BPL Telecom has Line traps in the range of 400 A upto 4000 A with inductance ratings of 0.2 mH, 0.5 mH & 1.0 mH.
  • The Line traps can be suspension or pedestal mounted depending on the requirements design of the switchyard.
  • By choosing the inductance rating of 1.0 mH the frequency bandwidth of 50 – 500 kHz can be achieved.
  • The product is type tested to IEC 60353 recommendations.
  • Insulating materials used meets class ‘F’ requirements of temperature as per IEC.
  • High operational security ensured by full inter turn insulation with epoxy impregnated glass fiber
  • High short circuit strength inherent with continuous filament fiberglass “roving” and vertical and horizontal ties.
  • Self supporting, solid structure formed by encapsulation technique.
  • Epoxy resins compatible with the glass fiber under thermal shock condition.
  • Aluminum construction throughout with all welded  current carrying connections welded.
  • Low noise levels at full load current Maintenance free.
  • Conditioned to withstand  extreme temperature fluctuations and whether conditions.
  • Tuning element  is designed with components carefully selected to give the optimum performance under all conditions of service.
  • Atmospheric pollution and climatic changes do not effect the performance.
  • No creepage path, due to the encapsulation of the main coil.
  • Conductors are used to minimize losses due to eddy currents.
  • The terminal supporting spider is reinforced to withstand the short circuit forces during fault conditions.
  • Corona ring provided to maintain the RIV voltage levels within specified limits.

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