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Which of the device is a carrier communication device?
CVT
Earth conductor
Wave trap
Lightning arrester
Wave trap
A wave trap, also known as a line trap, is a carrier communication device used in Power Line Carrier Communication (PLCC) systems. It acts as a band-stop filter that prevents the high-frequency carrier signals (typically 30 kHz to 500 kHz) from entering the substation equipment while allowing power frequency currents (50/60 Hz) to pass through unimpeded.
A wave trap, also known as a line trap, is a carrier communication device used in Power Line Carrier Communication (PLCC) systems. It acts as a band-stop filter that prevents the high-frequency carrier signals (typically 30 kHz to 500 kHz) from entering the substation equipment while allowing power frequency currents (50/60 Hz) to pass through unimpeded.
fcтАЛ=2╧АLCтАЛ1тАЛ тАФ Resonant frequency of the wave trap
Z=j(╧ЙLтИТ╧ЙC1тАЛ) тАФ Impedance characteristic of the resonant circuit
The wave trap consists of an inductor connected in series with the high-voltage transmission line, tuned to a specific carrier frequency using a parallel capacitor. By creating high impedance at the carrier frequency, it confines the communication signal to the intended transmission line section, preventing signal attenuation or leakage into the station busbar and transformers.
Prevents carrier signals from entering station equipment.
Eliminates reflection of carrier signals at the substation bus.
Reduces interference between different carrier channels.
Essential component for reliable tele-protection and voice communication over power lines.
Efficient blocking of high-frequency carrier signals
Negligible impedance offered to power frequency (50 Hz) current
High structural robustness for outdoor substation environments
High cost compared to simple filtering methods
Requires precise tuning to specific carrier frequencies
Susceptible to high voltage transients
Power Line Carrier Communication (PLCC)
Tele-protection signaling
Remote load control and data acquisition
CVT (Capacitive Voltage Transformer) is used for voltage measurement and coupling signal into the line.
Earth conductor is a safety component for surge protection.
Lightning arrester is designed to protect equipment from overvoltage surges, not for carrier communication.
C is correct тАФ A wave trap is a carrier communication device that acts as a band-stop filter to block carrier frequencies from entering substation buses.
Always remember that wave traps are for blocking signals, whereas coupling capacitors are for injecting carrier signals into the power line.