How do you measure a 3 phase motor?

Why do we use 1.73 for three-phase?

In a three phase circuit, the use of the constant 1.732 results from the fact that not all three phases are producing the same amount of power at the same time. … Suffice it to say that the correct power from a three-phase system at any point in time is found by multiplying by the square root of 3.

How do you calculate 3-phase current?

For 3-phase systems, we use the following equation: kW = (V × I × PF × 1.732) ÷ 1,000. Again, assuming unity PF and solving this equation for “I,” you get: I = 1,000kW ÷ 1.732V.

How many ohms should a 3 phase motor read?

The reading should be between 0.3 to 2 ohms. If it is 0, there is a short. If it is over 2 ohms or infinite, there is an open. You can also dry the connector and retest to possibly get more accurate results.

How do you calculate the full load of a 3 phase motor?

For three-phase, full load current for the resistive load is equal to the three-phase power divided by 1.732 times of voltage. Here power factor will be unity for resistive loads. Full load current I, I =P.

How many amps does a 7.5 kW 3 phase motor draw?

Three Phase Motors

IT\'S FUNNING:  What is the difference between the Maxi Cosi car seats?
MOTOR RATING HP APPROX. F.L.C. AT LINE VOLTAGE
5.5 kW 7.5 20
7.5 kW 10 27
9.3 kW 12.5 34
10 kW 13.5 37

How many amps is a 3 phase?

If your calculator doesn’t have a square root function, use 1.73 as an approximation of the square root of 3. For example, a three phase circuit using 25,000 watts of power and a line voltage of 250 will have a current flow of 25,000/(250 x 1.73), which is equal to 57.80 amperes.