132 kV to 33 kV grid substation single line diagram
This substation single line diagram represents a 132 kV to 33 kV grid supply point. A 132 kV transmission line passes through a disconnector, current transformer, and circuit breaker to the high-voltage main bus. A bus voltage transformer provides the measurement point. The 90 MVA grid transformer then supplies the 33 kV distribution bus.
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Scenario
This grid substation receives transmission power at 132 kV and distributes it at 33 kV with bus switching and reactive-power support.
Key decisions
- Transmission interface: A 2000 A disconnector, CT, and circuit breaker control the 132 kV incomer.
- Bus measurement: A voltage transformer monitors the 132 kV main bus.
- Grid transformation: A 90 MVA transformer steps power down to 33 kV.
- Bus flexibility: A bus section breaker supports controlled switching at 33 kV.
- Reactive support: A 12 MVAr capacitor bank is connected to the 33 kV bus.
When to reuse this
Use this for a high-level grid substation concept. Protection, surge arresters, grounding, clearances, and breaker duties require detailed utility engineering.
Frequently asked questions
Why is a capacitor bank connected at 33 kV?
What is the bus section breaker for?
Does the diagram include surge arresters?
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