What is the potential to ground for L2 in a 240 volts, 3 phase, 3 wire, grounded delta system?
The potential to ground for L2 in a 240 volts, 3 phase, 3 wire, grounded delta system is approximately 208 volts.
Explaining the Potential to Ground in a Grounded Delta System
Grounded Delta System Overview:
In a 240 volts, 3 phase, 3 wire, grounded delta system, each phase has a voltage of 240 volts and they are 120 degrees out of phase with each other. The system is referred to as a 3 wire system because each phase does not have a neutral wire.
Understanding the Potential to Ground:
In a grounded delta system, the potential to ground at the center tap of the transformer feeding the system is typically half the line to line voltage. However, for line 2 (L2), which is the high leg of the delta, the potential to ground is higher. The high leg's potential to ground can be found using the formula:
V_LG = V_LL * (sqrt(3)/2)
Where V_LG is the line to ground voltage and V_LL is the line to line voltage.
For a 240 volt system:
V_LG = 240 * (sqrt(3)/2) ≈ 208 volts
Therefore, in a 240 volts, 3 phase, 3 wire, grounded delta system, the potential to ground for L2 is approximately 208 volts.
Conclusion:
Understanding the potential to ground in a grounded delta system is crucial for ensuring the safety and proper functioning of electrical systems. By calculating the potential to ground, electrical professionals can take necessary precautions and maintain the system effectively.