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What else can I help you with?
What is 1.73 in load current calculation?
1.73 (the square-root of 3) is the ratio of line voltage to phase voltage in a star (wye) three-phase connection, and is the ratio of line to phase current ratio in a delta three-phase connection supplying a balanced load. In each case, it is derived from the phasor addition of two values displaced from each other by 120 electrical degrees.
If you were to pull 2 three phase circuits in the same conduit would you need more than 1 neutral and why?
If the load requires a single circuit breaker, as most three phase loads do, you need a separate neutral for each. This allows you to check the balance between each phase and the other phases as well as neutral, in order to detect a ground fault. It depends on the purpose of the three phase circuits - if this were CT cables, then yes, unless you intentionally over sized the ground wire. Otherwise this would cause unusually high voltage rise in the secondary of the CT during ground faults, which could lead to saturation (unless CT ratio is intentionally set high). As noted above, having separate neutrals helps to determine balance, although you can measure 3I0 from the phase currents for a similar relationship without actually looking at the neutral at all (some relays doe this for ground protection instead of directly measuring neutral current, see SEL's 351 for an example relay). No matter what, this would be highly irregular, and I wouldn't recommend scrimping on a neutral. In my experience, the more you move away from accepted practices (not to dampen ingenuity...), the more trouble you create for the future. If the loads were strictly three phase then there would not be any neutral needed. If from a three phase distribution panel the loads were three single phase loads then you can use one neutral for the three phase wires. This is a code rule that has to be adhered to. A same N, B same N, C same N and only in this combination. Conduit fill 4 wires, two three phase four wire circuits, conduit fill 8 wires.
What is the ratio of a 480vac single phase and a 120 vac secondary voltage?
The ratio for a 480 VAC to 120 VAC is 4 to 1.
What is Ratio between starting and running current of 3 phase ac motor?
The start up current should be listed on the motor nameplate as FLA , full load amps.
What will happen if we use current transformer of different rating for each phase in three phase supply?
A current transformer has to have the same ratio as the meter that it drives. Full scale deflection on the meter is 5 amps which equals the maximum allowed current on the phase that it is reading. A different ratio on the CT to meter would show an erroneous reading on the meter depending on the ratio of the connected CT. To keep costs down the meter is common to all three phases and is read by connecting the meter to the phase CT through a three position switch.
Difference between line transformation ratio and transformation phase ratio?
line transformation ratio would be the turns ratio (ie voltage ratio), while the phase transformation ratio is most probably the phase shift introduced by a 3 phase transformer.
What is the difference between a spectrum analyzer and a network analyzer?
spectrum analyser is single channel and cannot find ratio of phase and magnitude
Does the formula used to calculate the turns ratio uses the phase voltages and phase current?
No, the turns ratio formula calculates the ratio of the primary to secondary winding turns on a transformer using the number of turns on each winding. Phase voltages and currents are not directly used in this calculation.
Can a single phase inverter's working principle can be explained?
in single phase inverter we use two chopper the ratio of output ac to the ratio of input dc
What is 1.73 in load current calculation?
1.73 (the square-root of 3) is the ratio of line voltage to phase voltage in a star (wye) three-phase connection, and is the ratio of line to phase current ratio in a delta three-phase connection supplying a balanced load. In each case, it is derived from the phasor addition of two values displaced from each other by 120 electrical degrees.
What is the ratio between protons and electrons in a positive ion negative ion and neutral ion?
p+/e- ratio are respectively:>1 for cations,
What is the difference between SINR and CINR?
SINR - Signal to Interference and Noise Ratio CINR - Carrier to Interference and Noise Ratio difference between those to is difference between carrier and signal carrier is signal who doesn't "carry" any information . it must be modulated( by phase,freq or amplitude) and those changes convey information. carrier is unmodulated signal signal is defined as useful signal which carries information SINR is power of signal to power of interfenence and noise ratio
How do you calculate the phase constant in a given system?
To calculate the phase constant in a given system, you can use the formula: phase constant arctan(imaginary part / real part). This involves finding the ratio of the imaginary part to the real part and then taking the arctangent of that ratio.
If you were to pull 2 three phase circuits in the same conduit would you need more than 1 neutral and why?
If the load requires a single circuit breaker, as most three phase loads do, you need a separate neutral for each. This allows you to check the balance between each phase and the other phases as well as neutral, in order to detect a ground fault. It depends on the purpose of the three phase circuits - if this were CT cables, then yes, unless you intentionally over sized the ground wire. Otherwise this would cause unusually high voltage rise in the secondary of the CT during ground faults, which could lead to saturation (unless CT ratio is intentionally set high). As noted above, having separate neutrals helps to determine balance, although you can measure 3I0 from the phase currents for a similar relationship without actually looking at the neutral at all (some relays doe this for ground protection instead of directly measuring neutral current, see SEL's 351 for an example relay). No matter what, this would be highly irregular, and I wouldn't recommend scrimping on a neutral. In my experience, the more you move away from accepted practices (not to dampen ingenuity...), the more trouble you create for the future. If the loads were strictly three phase then there would not be any neutral needed. If from a three phase distribution panel the loads were three single phase loads then you can use one neutral for the three phase wires. This is a code rule that has to be adhered to. A same N, B same N, C same N and only in this combination. Conduit fill 4 wires, two three phase four wire circuits, conduit fill 8 wires.
I am the ratio of the sum of two numbers whose product is 21 to their difference. what ratio am I?
3 & 7? Sum 10, difference 4 so ratio 5:2 or 1 & 21? Sum = 22, difference 20 so ratio 11:10
What information do you get from a ratio comparison that you don't get from a difference comparison?
you get 2 sets of numbers in a ratio comparison and you only get one in a difference comparison
What is the ratio of a 480vac single phase and a 120 vac secondary voltage?
The ratio for a 480 VAC to 120 VAC is 4 to 1.
