SWITCHGEAR
33 kV industrial substation
This 33 kV industrial substation single line diagram traces power from a utility supply through an incoming vacuum breaker, instrument transformers, and main bus. Two process feeders leave at 33 kV, while a third feeder supplies a 10 MVA transformer that creates a 6.6 kV motor bus for a large compressor.
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CASE ANALYSIS
Scenario
A process plant receives a 33 kV supply and transforms it to a 6.6 kV motor bus for large rotating equipment.
Key decisions
- 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.
When to reuse this
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.
FAQ
Frequently asked questions
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.
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sld-33kv-industrial-substation