“Draw a single-line diagram for a 1 MWdc parking carport PV project with four 250 kWdc blocks, four 200 kWac inverters, 480 V collection, a 1 MVA 480 V to 12.47 kV transformer, and utility intertie recloser.”
看懂背後的決策。
Four identical PV blocks isolate array and inverter maintenance areas.
The inverter outputs collect on one 480 V AC bus.
A 1600 A main breaker protects the low-voltage collection side.
A 1 MVA transformer raises voltage to the 12.47 kV intertie.
The recloser marks the controlled connection to the utility feeder.
Use this topology for a distributed carport field with a dedicated medium-voltage interconnection. Protection studies and utility-owned equipment requirements will vary by service territory.
常見問題
Why are there four inverters?
Separate inverters align with four carport blocks and reduce the impact of a single equipment outage.
Why step up from 480 V?
Medium voltage reduces current and conductor size for an interconnection at this power level.
What does the recloser do?
It provides utility-style switching and protection at the feeder intertie.