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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).
Is line to line fault a 3 phase fault?
'Line conductors' are the three 'hot' conductors (A-B-C) that connect a three-phase supply to a three-phase load. In some cases, a pair of line conductors (e.g. A-B, B-C, or C-A) is used to supply a single-phase load. A 'line fault' can be a short-circuit fault between all three, or any two, of these line conductors -whether they supply a three-phase load or a single-phase load.
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 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 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 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.
What are the disadvantages of Impedance Relay using transmission line fault detection?
Impedance relays for transmission line fault detection can have several disadvantages. They are prone to misoperation during system changes, such as load variations or line outages, which can lead to incorrect fault detection. Additionally, their performance can be affected by the presence of series compensation or long transmission lines, where the measured impedance may not accurately represent the fault location. Finally, they may not effectively distinguish between different fault types, leading to challenges in selective tripping.
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.
