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What is the cause of unsymmetrical three phase short circuit?
Engminakareem
By definition a short circuit is the path of least resistance of current flowing through a circuit be it three phase or single phase. The main cause of this condition in electrical circuits is an insulation break down. This break down can be caused by overheating of the insulation to a point where the insulation disintegrates from the conductor that it is supposed to be protect. With the insulation missing from the wire there is the possibility of a short circuit to surrounding grounded material.
The other cause of insulation break down is from vibration. Unsupported conductors can vibrate against their metallic enclosures to a point where the insulation is just worn away. Once the insulation becomes thin enough the voltage will bridge the insulation threshold and take the path of least resistance to ground and a short circuit will occur.
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∙ 11y ago
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Short circuit bar on the railway?
What is the question? Assuming you're talking about short circuiting the live circuit, as soon as a phase to ground fault occurs protection will operate, opening a circuit breaker.
How can short circuit damage devices?
It depends if the short are before or after the device. The short circuit will cause high amperage trough the device and then blown. (JP)
When connecting two alternators in parallel do the two voltages have to be in phase or directly out of phase?
They must be precisely in phase. If connected out of phase current would flow uncontrollably between the two alternators as a short circuit.
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 would cause a short periodic low hum to come from a circuit breaker?
A bad circuit breaker. Replace it.
What is unsymmetrical current?
it means those currents those are short circuit.
Will overcharging cellphone cause electrical short circuit?
No, overcharging cellphone will not cause an electrical short circuit.
What happens when any phase conected to ground?
You get a short circuit.
Why is a short circuit considered a safety hazard?
A spark from a short circuit can cause a fire .
How does a thermal overload control a circuit when the phase short to ground?
If you are describing a circuit breaker then its electromagnetic trip component will operate in the event of a line*-to-ground (*not 'phase'!) short circuit. The thermal overload component will only operate in the event of a sustained overload.
Can switchboard explosion cause short circuit?
A short circuit is what usually causes a switchboard explosion.
Can a short circuit cause low voltage?
Most likely a short circuit will cause no voltage. Due to the high current on a short circuit fault the over current protection of the circuit will trip. This will cut the voltage supply off completely.
What happens if phase wire touch to earthing?
When a phase line touches the neutral by any conducting material means the Short Circuit. If there is a short circuit then the current in that circuit will be much higher and this increase in current may damage the the devices that are connected to that line.
The difference between short to a voltage circuit and short to a ground circuit?
A short circuit is an abnormal connection between two nodes intended to be at different voltages. A voltage circuit is caused intentionally for the purpose of voltage sensing. A ground circuit occurs between a phase and the ground.
Short circuit bar on the railway?
What is the question? Assuming you're talking about short circuiting the live circuit, as soon as a phase to ground fault occurs protection will operate, opening a circuit breaker.
Why fuse will get burnt when phase and neutral get connected?
A fuse is an overcurrent protection device, which protects a circuit by melting in the event of either a sustained overload current, or a short-circuit current. A short-circuit current will occur when a line (not 'phase') conductor makes direct contact with a neutral (or earth) conductor.
How can short circuit damage devices?
It depends if the short are before or after the device. The short circuit will cause high amperage trough the device and then blown. (JP)
