What are two components of no load current in transformer?
No load current of large power transformers consists of active and reactive component. Active component covers hysteresis and eddy current losses in the core. Reactive component (usually called magnetizing current) creates magnetic field / magnetic flux and lags the voltage by 90°.
Why no load current in a transformer is very low?
Transformers Questions and Answers – No Load Operation of Transformer. Explanation: No-load current lags behind the voltage by an angle which is near to 900. Thus, angle between no-load current and magnetizing current is very small. No-load current has another component which is in phase with voltage.
How many amps is a 25 kva transformer good for?
Three Phase Transformer
| KVA | 208V | 240V |
|---|---|---|
| 20 | 56.6 | 48.2 |
| 25 | 69.5 | 60.2 |
| 30 | 83.4 | 72.3 |
| 37.5 | 104 | 90.3 |
How do you find the full load current?
Look at the above formula, the three-phase full load current is equal to Power divided by the 3 times of product of line to neutral voltage and power factor. Here three-phase full load current is equal to the power divided by 1.732 times of line to line voltage and power factor.
What is Max load current?
The maximum load current is the smallest amount of current in amps that must be drawn from a particular output for that output to function.
How many amps is a half horsepower?
AMP DRAW BASED ON HORSEPOWER
| HP | 1 Phase Amps | 3 Phase Amps |
|---|---|---|
| 115 volt | 208 volt | |
| 1/2 | 9.8 | 2.4 |
| 3/4 | 13.8 | 3.5 |
| 1 | 16 | 4.6 |
What is the formula to convert HP to amps?
Knowing that we can write hp to amps formula for direct current (DC) as: I = P * 746 / (V * η) . As the SI unit of power is the watt, it’s common to convert units before estimating the amperage. A rule of thumb states that you should multiply the power in hp by 746 to get the power in watts.
What size breaker do I need for a 7.5 hp motor?
Re: Wire and breaker size for 7.5 hp motor You need 50 amp rated wire with a 50-100 amp breaker.
How do you calculate fuse rating?
The fuse rating can be calculated by dividing the power used by the appliance by the voltage going into the appliance. I (Amps) = P (Watts) ÷ V (Voltage).
How do you size a fuse for a motor?
You must size the conductors at 125% of the motor FLC [430.22(A)]. You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)]. You must size the short-circuit ground-fault protection device from 150% to 300% of the motor FLC [Table 430.52].
What is the standard fuse rating?
The standard ampere ratings for fuses (and circuit breakers) in USA/Canada are considered 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800, 1000, 1200, 1600, 2000, 2500, 3000, 4000, 5000, and 6000 amperes.
How do you choose a fuse for a motor?
Motors should be fused with a time-delay fuse rated 175% of the motor’s full load operating amperage, 250% of the full load operating amperage if a circuit breaker is used. The wire to a motor must be rated to carry 25% more amperage than the motor draws when operating at full load.