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In substation which of the device is a Carrier communication device
CVT
Earth conductor
Wave trap
Lightning arrestor
Wave trap
A Wave Trap (also known as a Line Trap) is a critical component in Power Line Carrier Communication (PLCC) systems installed in substations. Its primary function is to confine the high-frequency carrier signals to the protected transmission line, preventing them from entering the substation busbars or other equipment where they could be attenuated or cause interference.
A Wave Trap (also known as a Line Trap) is a critical component in Power Line Carrier Communication (PLCC) systems installed in substations. Its primary function is to confine the high-frequency carrier signals to the protected transmission line, preventing them from entering the substation busbars or other equipment where they could be attenuated or cause interference.
frтАЛ=2╧АLCтАЛ1тАЛ тАФ Resonant frequency formula for the Wave Trap
Z=RCLтАЛ тАФ Impedance of the parallel tuned circuit at resonance
The Wave Trap acts as a band-pass filter consisting of a parallel resonant circuit (inductor and capacitor) tuned to the carrier frequency (typically 30 kHz to 500 kHz). Since impedance Z=R2+(XLтАЛтИТXCтАЛ)2тАЛ, at resonance, the parallel combination provides very high impedance to the high-frequency carrier signal, effectively blocking it, while offering negligible impedance to the 50 Hz power frequency current.
Used in Power Line Carrier Communication (PLCC) for data/voice transmission over power lines.
Prevents high-frequency carrier waves from entering the substation equipment.
Installed in series with the main transmission line at the substation entrance.
Provides a low-impedance path for the power frequency (50/60 Hz) current.
Prevents signal loss within the substation.
Protects sensitive communication equipment from power system transients.
Adds series impedance to the power line.
Requires precise tuning to specific carrier frequencies.
Tele-metering
Tele-protection
Load dispatch communication
CVT (Capacitive Voltage Transformer) is used for voltage measurement and coupling the carrier signal to the line, but it is a coupling device, not a trap.
Lightning arrestors are used for surge protection, not carrier communication.
C is correct тАФ Wave trap is the specific device designed to block high-frequency carrier signals while allowing the power frequency current to pass.
Remember: CVT acts as a coupling device for carrier signals, while the Wave Trap acts as a blocking device to prevent signal leakage into the substation.