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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.
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What is power line carrier communication?
bill gates
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used for remote metering & control. The existing line in a building can be used as a local area network backbone or integrated in to a wide area network.
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.
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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.
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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.
What are practical applications of influence line diagrams?
What are the practical applications of influence line diagram
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Applications of maximum power transfer theorem?
Increasing the power delivered to load motor in an electric vehicle design and a solar array loaded by a grid tied inverter are some applications of maximum power transfer theorem. Maximizing the power delivered to transmission line or antenna in a radio transmitter final amplifier stage design is another practical application.
The has a direct line of communication with the PCO and the has a direct line of communication with the PM?
Aco,pi
How can a false subject line hamper communication?
how can a false subject line hamper communication
