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What are two advantages of Power Line Communication?
1. The advantage of power line communication is to avoid new installation of wire (communication channel) where the new installition imposes limitation due to place amd cost. Also The availability of power line plugs extends the flixiblity of power line as acommunication channel.
What are merits and demerits of power line communication?
One of the merits of power line communication is that it offers great flexibility to where computers and peripherals can be placed. The demerits of power line communication is that if not properly checked it can lead to death especially of children.
What is power line carrier comunications?
Power in USA is 60 hertz. Typical speech is between 0 and about 16,000 Hz. In power line carrier applications the 60 Hz is modulated by a higher frequency that is in turn modulated by a transducer that captures speech. With the proper modulator and demodulators you can either modulate the 60 Hx carrier to send a transmission or demodulate to receive.
What is the difference between an IVT and CVT transmission?
CVT - Capacitive Voltage Transformer Used for Measuring Voltage & Protection purpose, It is specially used in the line side along with PLCC (Power line Carrier Communication) to block the high voltage and makes the level to acceptable form of the communication equipment. IVT - Induced Voltage Transformer Please any one explain it... By Gokulakannan E
Why 2 wave traps are provided in the substation?
Line trap also is known as Wave trap. What it does is trapping the high frequency communication signals sent on the line from the remote substation and diverting them to the telecom/teleprotection panel in the substation control room (through coupling capacitor and LMU). This is relevant in Power Line Carrier Communication (PLCC) systems for communication among various substations without dependence on the telecom company network. The signals are primarily teleprotection signals and in addition, voice and data communication signals.Line trap also is known as Wave trap. What it does is trapping the high frequency communication signals sent on the line from the remote substation and diverting them to the telecom/teleprotection panel in the substation control room (through coupling capacitor and LMU). This is relevant in Power Line Carrier Communication (PLCC) systems for communication among various substations without dependence on the telecom company network. The signals are primarily teleprotection signals and in addition, voice and data communication signals. The Line trap offers high impedance to the high frequency communication signals thus obstructs the flow of these signals in to the substation busbars. If there were not to be there, then signal loss is more and communication will be ineffective/probably impossible.
Relation between total power and carrier power?
Total Power = Carrier Power * 5
What animals can represent communication?
Carrier Pidgions
Applications of power line carrier communication?
Power line carrier communications is used to provide high speed tripping for faults covering the entire power line. On typical VHV and EHV systems, distance relays are used to protect the line in the event faults occur. Distance relays look at the impedance of the line (Voltage / current) to determine where a fault is. As one gets further away from the local end, the impedance will continue to grow. If one was to set distance relaying to look exactly to the very end of a line, it may or may not see the far end for all faults, due to errors in measurement of line impedance, error in the relay measuring, variances in system voltage, etc. Moreover, these errors may result in the relay seeing faults on the next line out (referred to as "overtripping"). Because of this, distance relays are typically set up in several zones - zone 1, which will be 80 - 90% of the line impedance, which is set to unconditionally trip; zone 2, which is set to 115% or more of the line impedance so it is garunteed to see the remote end. Because zone 2 sees beyond the line, it must be conditionally controlled. This conditional controlling requires information from the remote end - specifically if the fault is "in front of" (on the line) or "behind" (on a different line) the remote relay. And this is where power line carrier equipment comes in. On many lines in remote locations, there isn't a whole lot of fiber or microwave type communication equipment available. So signals are directly injected onto the powerline to pass the above information back and forth. On some power line carrier equipment, there is also the ability to inject voice, so the same equipment can be used for communication between technicians at different substations.
What are the Applications of double side suppressed carrier modulation?
Each of the two sidebands can be modulated independently to give two simultaneous communication channels. There would be no point in radiating the carrier, as it carries no information, and would waste transmitter power.
Why you are suppressing the 2 sidebands of dsbsc?
The sidebands are not suppressed in DSB-SC ... that's where the information is !.The carrier is suppressed, and only the sidebands are transmitted. The mainadvantage of doing that is the fact that the RF power that would otherwise beused for the carrier is then available for the sidebands. This swap typicallyresults in increased range of communication with the same amount of power.
What is the function of coupling capacitor in substation?
A coupling capacitor in substation is used for power line communication purposes. It used after the wave trap. The capacitance ranges from 2200pf to 10,000pf. It offers very low impedance to high frequency carrier signal and allows them to enter the line matching unit and offers a very high impedance path to low frequency signal or wave and blocks it for reaching the line matching unit. In short, it allows only those frequencies needed for communication purposes.
What is one disadvantage of an amplitude modulation communication system?
One disadvantage of the standard amplitude modulation system is that 67% of the power is used for the carrier, but the carrier transmits no information, so it can be considered as wasted power.The 34% remaining power is split between two mirror opposite sidebands so, in effect, you really only have 17% of your power used to carry the signal.
