“Draw an indoor 11 kV to 400 V distribution substation single line diagram with an SF6 RMU load-break switch, 63 A transformer fuse, 630 kVA cast-resin transformer, 1000 A LV air circuit breaker, and lighting, power, and HVAC feeders.”
図の背後にある意思決定を読み解く。
An SF6 RMU load-break switch receives the 11 kV cable supply.
A 63 A fuse protects the 630 kVA transformer primary.
Cast-resin construction suits an indoor equipment room.
A 1000 A ACB feeds the 400Y/230 V distribution bus.
Lighting, power, and HVAC loads are independently protected.
Use this for a building-scale indoor substation concept. Room ventilation, fire strategy, protection settings, and local MV standards must be verified.
よくある質問
Why use a cast-resin transformer indoors?
It avoids liquid dielectric fluid and is commonly selected for indoor applications.
What is the RMU switch used for?
It provides compact medium-voltage switching and isolation at the cable incomer.
Does a transformer fuse replace all protection?
No. Final protection design must coordinate MV fuses, LV breakers, and upstream utility devices.