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Single phasing is an unwanted condition where one phase in a three-phase power system is missing, due to a tripped breaker or other condition. With just two lines hot, there is no phase rotation and thus the power delivered to the load is single-phase. This is very bad for most three-phase loads, especially motors. While a lightly loaded motor will continue to turn, it will be with reduced speed and power. Most moderately loaded motors will stall, but continue to draw current. The current does nothing but produce heat, eventually burning up the motor. This is such a problem that special devices have been designed to detect the phase-loss condition and disconnect all lines automatically to avoid damage.
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What is electrical single-phasing?
On a three phase system, when one of the leg fuses opens due to a fault current on that leg, the system is said to be single phasing.
What is single phasing preventor?
Single phasing preventor is an electronic circuit which prevents the Thee phase operated Electrical machines from single phase cut off, Phase reversal and phase imbalance.
What happens if single phasing occurs when a motor is running?
motor stops
What is the meaning of single phasing of a transformer?
Single phasing occurs when one or two of the fuses protecting the load fault open. This is likened to using two legs from a three phase source to provide two single phase feeds, hence the name.
Does the concept of temperature apply to a single molecule?
Concept of temperature in single molecules could be explain through statistical thermodynamics and measure the temperature in term of kinetic energy of the molecules. Forclassical thermodynamics, the temperature is macroscopic properties andcan't be explain or describe in the classical scope.
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All motor circuits require what kind of protection?
All motor circuits require protection against single-phasing.
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First of all, the colours red, yellow, and blue, are applied to LINES not to phases! To determine which line is which, you must compare them with lines that are identified. This process is known as 'phasing out', and is difficult to explain without using a diagram. I suggest you check out 'phasing out' on the internet.
