For a wye-connected load with 240V phase voltage and 18A phase current: line voltage is 415.5V, line current remains 18A (balanced system assumed).
The line voltage and line current can be calculated using the following steps:
1. Phase voltage to line voltage relationship:
In a wye (star) connection, the line voltage is √3 times the phase voltage. Therefore, the line voltage (VL) in this case is:
VL = √3 * VP = √3 * 240 V ≈ 415.5 V
2. Phase current to line current relationship:
In a balanced three-phase system, the line current (IL) is equal to the phase current (IP). Therefore, the line current in this case is:
IL = IP = 18 A
Therefore, the line voltage and line current supplying the load are:
Line voltage (VL): 415.5 V
Line current (IL): 18 A
It's important to note that this is only true for a balanced three-phase system. If the load is unbalanced, the calculations would be more complex and require additional information about the phase impedances.