Calculate three phase power from voltage, current and power factor -
Calculate current from three phase apparent power and/or active power -
Tip: registered users can save calculations.
For a tutorial on three phase calculations, please see: Three Phase Current - Simple Calculation
I have been thinking recently that there appears to be less professional integrity around than when I first started my career in electrical engineering...
Just added a page to the tools, which will allow you to calculate the synchronous speed, slip and rated torque for an induction motor. Not a particularly...
The following tables provide quick order of magnitude fault levels for a a range of typical low voltage situations.
Per unit fault calculations is a method whereby system impedances and quantities are normalised across different voltage levels to a common base. By removing...
Many questions sent in to the site are in connection with motor starting and in particular star-delta. For all but the simplest application, there is...
There are a lot of interesting two page type notes on various medium voltage topics – switchgear, circuit breakers, bus systems etc. It is on the Siemens...
A quick post in connection with an email question: Live Tank - the circuit breaker the switching unit is located in an insulator bushing which is live...
In three phase systems, the use of transformers with three windings (or legs) per side is common. These three windings are often connected in delta or...
If you want to check a circuit is dead (not live), you should always use the three point method. First check a known live circuit, then check the dead...
Following on from my post on railway electrification voltages, I thought an introduction to traction substations would be a good idea. Traction substations...