“Draw a 480 V double-ended switchgear single-line diagram with two 13.8 kV utility feeders, two 2000 kVA transformers, 3200 A mains, split Bus A and Bus B, a normally open bus tie, and two 800 A MCC feeders.”
図の背後にある意思決定を読み解く。
Each 13.8 kV feeder has a dedicated 2000 kVA transformer.
Both 480 V mains are rated 3200 A and 65 kA.
The bus tie is normally open to avoid paralleling sources.
Each bus supplies an independent 800 A MCC feeder.
Use this topology for plants that need sectionalized low-voltage distribution. Interlocking and transformer capacity must be verified before closing the tie.
よくある質問
Why is the bus tie normally open?
It keeps the two transformer sources separated during normal operation.
Can one transformer feed both buses?
It may during a transfer if transformer capacity and interlocking allow it.
What is an MCC feeder?
It is an outgoing circuit that supplies a motor control center.