Why is carrier current protection used?
Carrier-current protection is the most widely used scheme for the protection of Extra High Voltage (EHV) and Ultra High Voltage (UHV) power lines. The carrier signal is directly coupled to the power line itself which is to be protected.
Which component uses carrier current protection?
The main elements of the carrier current protection are: Transmitter, Receiver, Coupling equipment and Line trap.
What are the different types of carrier protection wires used for carrier aided protection scheme?
Carrier Circuits for Protection: There are two basic forms of carrier protection schemes: (a) directional comparison protection, and (b) phase comparison protection. (a) Directional Comparison Protection: The direction of current flow is compared at the two ends of the protected section by means of directional relays.
Which of the following carrier frequency is used in carrier current protection scheme?
The signals generated in a carrier-current protection scheme are at a frequency between 50 and 500 kHz. Below 50 kHz the size and cost of the coupling equipments would be too high and above 500 kHz the line losses and therefore the signal attenuation would be too high on long lines.
How is carrier current protection used in power lines?
Carrier-current protection is the most widely used scheme for the protection of Extra High Voltage (EHV) and Ultra High Voltage (UHV) power lines. The carrier signal is directly coupled to the power line itself which is to be protected.
What is the frequency of a carrier current protection scheme?
During normal conditions or external faults, the power flows into the protected section at one end and leaves at the other end. During internal faults, the direction of power flow is inwards at both the ends. The signals generated in a carrier-current protection scheme are at a frequency between 50 and 500 kHz.
Which is better carrier current or distance protection?
The carrier signal is directly coupled to the power line itself which is to be protected. Carrier-current protection is faster and superior to distance protection schemes and is more reliable when used for long transmission lines, although the terminal equipments are more expensive and complicated.
Which is the most reliable carrier protection scheme?
It is one of the most reliable protecting schemes because it protects the system equipment from damage. Carrier Permitting Blocking Scheme – The carrier, protective schemes allows the fault current to enter into the protected section of the system. 2. Phase Comparison Carrier Protection