How to Calculate 3-Phase Line-To-Ground Voltage

Three-phase equipment is commonplace in power distribution systems.
••• Jupiterimages/ Images

Three-phase systems are prevalent in many power distribution systems. This is because 3-phase systems have built in efficiencies for high power transmission systems. The word 3-phase means the system has three separate lines, spaced 120 degrees apart, where each line carries the identical voltage. This identical voltage is the line to ground voltage.

    Find the kilovolt-amperes or "KVA" rating associated with the three-phase power distribution system. This is a standard rating associated with power distribution systems. Refer to system specification and/or circuit diagram. As an example, assume it's 20 KVA

    Find the current rating, or "A", in units of amperes or amps. Refer to system specifications and/or circuit diagram. As an example, assume it's 30 amps.

    Calculate the line to ground voltage using the formula: V (line to ground) = (KVA x 1000)/(I x 1.73). Continuing with the example:

    V (line to ground) = (20 x 1000)/(30 x 1.73) = 20000/51.9 = 385.4 volts.

Related Articles

How to Calculate the Size of a Grounding Conductor
How to Get 120V From a 208V 3 Phase
How to Calculate Three Phase Amperage
How to Calculate Orifice Size
How to Calculate Kva to Amp
How to Calculate 30 KW to Amps
How to Size an Overcurrent Device for a Transformer
How to Calculate Millivolts to Amps
How to Change Electrical Amps to Watts
How to Calculate the Size of a Grounding Conductor
How to Convert KVA to KW 3-Phase
How to Convert 12 Volt to 6 Volt
How to Calculate the Short Circuit Rating
How to Reduce Voltage on 12 Volt System to 4 Volt
How to Convert 12 Volt Alternator to 120 Volts
Types of Electrical Loads
How to Convert HP to Amps & Volts
How to Calculate IRMS
How to Calculate Transformer VA Rating
How to Calculate Voltage Across a Resistor

Dont Go!

We Have More Great Sciencing Articles!