What is the purpose of a line trap?

What is the purpose of a line trap?

Line traps prevent transmission of these high frequency signals to unwanted directions without loss of energy at power frequency. Line traps are series-connected to the transmission lines, and are designed to withstand the rated power frequency current and the short circuit current to which the lines are subjected.

Where is wave trap located?

Tuning Device of Wave Trap: This device is securely installed inside the main coil. It adjusts blocking frequency or bandwidth and consists of coils, capacitors, and resistors.

What is the function of line trap used in carrier current protection?

Line trap is an LC network inserted between the busbar and connection of coupling capacitors to the line and tuned to resonance at the high frequency and are used to confine the carrier currents to the protected section so as to avoid interference with or from adjacent carrier current channel.

Why is PLCC used in a substation?

PLCC in modern electrical power system substation is mainly used for following purpose: Carrier protection relaying of transmission line so that: Inter trip command can be issued by relay due to tripping of circuit breaker at any one end.

What is coupling capacitor in transmission line?

Coupling Capacitor Coupling capacitor connects the carrier equipment to the transmission line. The coupling capacitor’s capacitance is of such a value that it offers low impedance to carrier frequency (1/ωC) but high impedance to power frequency (50 Hz).

What is a line tuner?

Line Tuners The line tuner/coupling capacitor combination provides a low impedance path to the power line by forming a series resonant circuit tuned to the carrier frequency. On the other hand, the capacitance of the coupling capacitor is high impedance to the power frequency energy.

What is through fault in power system?

Through fault is nothing but a fault which occurs outside of the protective zone or in simple words the external fault is called through fault. Two kind of through fault is considered as through fault. One is External short circuit and another one is overload condition.

What is a line trap?

Line traps are used in Power Line Carrier Communication (PLCC) systems. The line trap is also known as a wave traps. Line trap is connected in series with transmission line. Line Traps are inserted into high voltage AC transmission lines to prevent undue loss of carrier signal power (40 kHz to 500 kHz) under all power system conditions.

What is a line trap in plc?

Line Traps for Power Line Carrier (PLC) communication systems represent a significant application segment for high voltage inductors. Usually wave trap is located at entrance of substation in incoming line. As communication waves are high frequency they will act as harmonics towards electrical equipment’s like transformer, breaker etc.,

What is wave trap in transmission line?

A wave trap is a Prevention device that is mounted on the transmission line to prevent the entry of a high-frequency waveform into the low-frequency device. The shape of the wave trap is cylindrical. The other common names of wave traps are line trap or High-frequency stopper (2Khz to 250Khz).

What type of wave trap is used in 66kV substation?

The substation over 66kv uses a wave trap to filter “carrier communication frequency”. We can use a line trap or wave trap along with the electrical equipment CVT (Capacitive voltage transfo rmer. The circuit diagram of Wavetrap is the symbol of the wave trap.