“Draw a 33 kV industrial substation single-line diagram with a 1250 A incoming vacuum breaker, protection CT, bus PT, two 630 A process feeders, a 10 MVA 33 kV to 6.6 kV transformer, and a 2.5 MW compressor motor.”
Comprenez les décisions qui le sous-tendent.
The incoming breaker is rated 33 kV, 1250 A, and 25 kA.
CT and PT provide protection and voltage measurement inputs.
Independent process feeders leave the 33 kV bus.
A dedicated feeder supplies the 10 MVA transformer.
The 6.6 kV motor bus serves a 2.5 MW compressor.
Use this pattern for an industrial medium-voltage intake with major motor loads. Relay protection and motor-starting studies are needed for an actual installation.
Questions fréquentes
Why use 6.6 kV for a compressor motor?
Medium voltage keeps current manageable for multi-megawatt motors.
What do CT and PT devices do?
They provide scaled current and voltage signals for protection and metering.
Why use a vacuum breaker?
Vacuum breakers are commonly used for medium-voltage switching and fault interruption.