# All Questions

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### How to estimate the power consumption of a motor when running at low load

I am trying to calculate the electrical power cost-saving of reducing the amount of time a machine runs idle (when the motor is running unloaded). From the meter data, the amps when idling is about ...
53 views

### Multi phase vs single phase power factors

Are there any differences between calculating single phase and multi phase power factors? I'm open to general answers, but more specifically: If PF1=P/S, does PF3=(Pa+Pb+Pc)/(Sa+Sb+Sc)? Does ...
317 views

### Why does line current equals the total apparent power divided by 3 times the phase voltage?

In this circuit with frequency of 50hz and line to line voltage of 400 V why is the current $I_A = S_t/3V_P$ I don't understand the logic behind since there is one Delta connection, I understand ...
71 views

### Does using electronics with poor power factor affect the pulse power capability of a generator rated for a certain KVA?

The situation is such: There is a multi-pole, three-phase, permanent magnet generator (rated for 100 KVA, let's say) that feeds into a simple diode rectifier with a capacitive/DC Voltage load (...
324 views

### Measuring power factor of a single phase motor on a three-phase service

I am trying to measure the power factor of a single phase, 208V compressor motor that is connected across phases B & C of a three-phase service and drawing 8-10A. My first attempt using a Fluke ...