Jey-L
Member
- Location
- South Florida
- Occupation
- Electrical Engineer
Hi All,
I've got a retrofit job for a commercial building where I need to install a standby genset. Service is open delta 3-phase (120/240V). From my research, it appears like I will have to provide a generator wired for high leg delta. Given that a good bit of the load is single phase loads (apart from the elevator and three AC units), one of the phases (with the neutral, lets call it A-B) will be quite a bit more loaded than the other two. So, how do you take that into consideration for sizing.
Thinking out loud, I just need to size it to ensure that phase A-B is not overloaded, right? For example, if I have 50kW of single phase loads, and I have a 150kW 3-phase unit, would the real capacity for each phase be 43.5kW (87% of 50kW)?
Forgive my ignorance, ALL of my experience has been in large industrial plants. Never looked at an open delta service until this week!
I've got a retrofit job for a commercial building where I need to install a standby genset. Service is open delta 3-phase (120/240V). From my research, it appears like I will have to provide a generator wired for high leg delta. Given that a good bit of the load is single phase loads (apart from the elevator and three AC units), one of the phases (with the neutral, lets call it A-B) will be quite a bit more loaded than the other two. So, how do you take that into consideration for sizing.
Thinking out loud, I just need to size it to ensure that phase A-B is not overloaded, right? For example, if I have 50kW of single phase loads, and I have a 150kW 3-phase unit, would the real capacity for each phase be 43.5kW (87% of 50kW)?
Forgive my ignorance, ALL of my experience has been in large industrial plants. Never looked at an open delta service until this week!