“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.”
Die dahinterstehenden Entscheidungen verstehen.
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.
Häufige Fragen
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.