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A1: I believe fault isolators are used on lower voltage (typically). I have no experience with these, and have not heard of such an application on the transmission system (although that doesn't mean one doesn't exist).
Usually breakers / circuit switchers are used to isolate faults on the transmission system, with protective relays identifying the faults and tripping these interrupting devices.
A2: Surge arrester will absorb most of the line faults. Transmission line surge arresters will from up to 800kV. Visit http://www.abb.com/product/us/9AAC710000.aspxfor more information.
A3: Surge arrestors are typically used to limit surges due to switching, and potentially lightning strikes, and similar situations. They essentially help keep the voltage from spiking during such events by providing a low impedance path to ground for the extra current. These sort of events are not faults, though. Surge arrestors are used to prevent faults, not isolate or interrupt them. If surge arrestors were not used, voltage transient spikes could be large enough to cause flashover across insulators, resulting in a fault condition, which would require operation of protective equipment (breakers, circuit switchers, fuses, etc.) to isolate the fault.
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What is the major material used in constructing transmission lines?
The major material used in the construction of transmission lines is aluminum alloy. Steel is also used to reinforce the lines. No insulation is used for overhead transmission lines.
What are the relay used in transmission line?
mho rerlay is used in long transmission lines
In relation to electric what does the term fault protection mean?
Protective devices - relays, CT,PT, isolators, circuit breakers are used for fault protection. Fault protection means If there is a fault in the circuit, the circuit must be cut off before any damage occurs due to fault.
Why star connection used in transmission?
Transmission circuits are prone to earth faults.Only star connection permits flow of earth fault current and the operation of earth fault relays.
What is the purpose of ground wires in overhead transmission lines?
connection of the ground of all the transmission lines and used as a communication cable between protection devices
What are the difference MCB and CB?
The main difference between MCB, RCCB, and Isolators Isolators are generally used in power system while on the other hand, MCB is the circuit breaker. Isolators are manually-operated device, and on the contrary, the circuit breaker is the automatically-operated device.
What is length of the towers that is used on transmission lines?
That is depends on the factor of sag and clearance required. And also on the level of voltage transmission used.
What types of wire are used in transmission lines?
Stranded aluminium, with a steel core.
Why dampers are used at the end of tower in transmission lines?
To 'damp' vibrations in the conductors.
Why transmission lines are thicker than TV cable wires?
Transmission lines are thicker than TV cable wires because the transmission lines are used to transmit both low freq and high freq signals. And the losses of the transmission lines depend the resistance of the line which inturn depend upon length and area. As we have to transmitt the signals over long distances the transmission lines are thicker in size.Whereas in TV cable wires the construction is totally different in which transmission of signals is in between two conductors thereby avoiding losses.Therefore there is no necessity for these lines to be made thicker. That is why transmission lines are thicker than TV cable wires.
Why copper is used in electrical transmission line?
Copper is a good conductor and is fairly strong. It generally is not used in power transmission lines due to cost - generally aluminimum is used.
HVDC transmission lines being used in Pakistan?
it will be implemented soon...planning is in progress
