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What are symmetrical and unsymmetrical faults?
the fault in electrical transmission line which give rise to symmetrical fault current is called symmetric fault. e.g; L-L-L-G fault. the fault in transmission line which give rise to unsymmetrical fault current is called unsymmetrical fault.e.g; L-L , L-L-G , L-G fault to solve the unsymmetrical fault, the fault current can be represented by sum of the sequences--zero phase sequence , +ve phase sequence , -ve phase sequence. where L:line G:ground
What are the types of faults in ehv transmission lines?
The three types are Line to ground faults line to line fault double line to ground fault three phase line to ground 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.
Why a 3 phase fault is more severe than other fault in transmission line?
It isn't necessarily (depending on your perspective). A three phase fault is a severe duty on generators, because all three phases are shorted. In solidly grounded systems a phase to ground fault could result in higher magnitude currents, which would be more difficult for a breaker to interrupt (so from the breaker's perspective, this would be more severe).
What is pg clamps in transmission line?
pg clamp is known for parallel groove clamp,especially used in transmission line to hold transmission conductors in parallel.
What are symmetrical and unsymmetrical faults?
the fault in electrical transmission line which give rise to symmetrical fault current is called symmetric fault. e.g; L-L-L-G fault. the fault in transmission line which give rise to unsymmetrical fault current is called unsymmetrical fault.e.g; L-L , L-L-G , L-G fault to solve the unsymmetrical fault, the fault current can be represented by sum of the sequences--zero phase sequence , +ve phase sequence , -ve phase sequence. where L:line G:ground
What is a symmetrical fault?
generally faults are of symmentrical and unsymmentrical faults that occur in majorly occurs in transmission lines........ the fault in electrical transmission line which give rise to symmetrical fault current is called symmetric fault. e.g; L-L-L-G fault. if they are in low values then system is said to be "protected" .... In order to avoid those NEUTRAL SHOULD GROUND with resistor or reactor etc,,,,,,,,...........
What are the types of transmission line faults?
these are the faults that occur in transmission line: 1. line to line fault 2. line to ground fault-this is the most common fault that occurs in tr. line(75%) 3. double line to ground fault 4. triple line to ground (or) 3 phase fault- this is the most serious and dangerous fault that occurs in transmission line.(but rarely occurs)
What are the types of faults in ehv transmission lines?
The three types are Line to ground faults line to line fault double line to ground fault three phase line to ground fault
What are symmetrical faults?
A three-phase symmetrical fault exists when all three line conductors are short-circuited, sometimes to earth (ground). An unsymmetrical fault occurs when only one or two of the three lines are involved.
What is Fault location in transmission line?
Fault location in a transmission line refers to identifying the specific location where a fault has occurred, such as a short circuit or a ground fault. This process involves using various methods such as distance protection relays, traveling wave analysis, and fault passage indicators to pinpoint the fault location accurately. It is crucial to quickly isolate the faulted section and restore power to the rest of the transmission system to minimize downtime and maintain system reliability.
How does a distance protective relay work?
The distance relay trips when a fault occurs at a distant or a remote place in the electric transmission line. There is a mechanism based on the impedance calculation of the distance of the transmission line after which it is accurately known where the fault has taken place. Thus the distance protective relay can trip the circuit & prevent the fault to be carried further and also can indicate the location of the fault.
Is a circle symmetrical?
a circle has infinite line of symmetry, if you spin it, it has still got infinite linesso yes it is symmetrical
What are lines that make two halves of a figure symmetrical?
a symmetrical line.
Is something still symmetrical without a line of symmetry?
it is not symmetrical. welcome!
Is the number 1 symmetrical?
Only if it's drawn as a straight line. If the horizontal line at the base, and the sloping line at the top are added, it is not symmetrical.
Why phases in a transmission line need to be transposed?
Transposition means exchanging of the position of the transmission line after equal distances. Even if the voltage across the conductors are equal during the transmission, there will be slight differences and will result in varied inductances of the conductors. Hence if we have symmetrical conductors running through transmission line in a similar fashion, there may be unbalances in voltage. Also mutual inductances vary for untransposed lines.
