WAVE TRAP....


Wave trap,its name indicates that it is used to trap some waves.

Q.What is the use of wave trap in electrical system,where it used?
A.Wave trap is used for communication purpose in substations.

Q.We have the telephones in these days?then what is again these communication?
A.20 years back our country was not developed in telecommunication sector.then our electrical engineers developed a system that communication can be done through our power lines.it is called power line carrier communication (PLCC).
                                  But in these days we are modifying with optical fiber inside the earth wire. it will take care of speech communication and protection.

Q.Can we transmit electrical power and communication at the same time with single conductor?
A.We can transmit,but with different frequencies.so they can be separated easily by wave trap at entrance of substation.
          Generally electrical power waves has frequency of 50 Hz,so we send our communication waves with high frequencies like 150kHz,200kHz etc..,
             Wave trap consists of filter circuit (combination of capacitor and inductor) which is used to allow only power frequency waves to electrical equipment's and stop the communication wave in to yard.




before erecting the wave trap at site (765/400 kv substation,India)
Q.Why wave trap is located at entrance of substation?what will happen if electrical equipment's receive communication waves?
A.As communication waves are high frequency (and not power frequency) they will act as harmonics towards electrical equipment's like transformer,breaker etc...,so in order to protect them we should connect at entrance (after the CVT) so that wave trap will trap the communication waves.

Q.What is the need of communication between substations?
A.If any fault in any substation,it should intimate to all connected substations to it.
  each telephone is connected to only one particular substation only.

3 comments:

  1. Method to ensure on qualified persons are allowed in the limited approach or arc flash boundaries Used Lab Equipment Auction

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  2. WAVE TRAP also is known as Line 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/teleportation 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 teleportation 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/teleportation
    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 teleportation signals and in addition, voice and
    data communication signals.

    The Wave 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.

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  3. What is the function of wave trap in substation?

    Wave traps are used at substations to prevent the transmission if high frequency carrier signal of power line communication to unwanted destinations. Wave trap also called Line Trap. They are part of PLCC . POWER LINE COMMUNICATION CARRIER is used to transmit communication signal over transmission lines.

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