ERJ-145 Electrical Practice Test

What happens to BTC2 if the #1 Generator fails with the APU generator available?

BTC2 closes BTC2 remains closed BTC2 opens BTC2 disconnects

Correct Answer:

BTC2 opens

Explanation:

When a generator drops offline, the electrical system reconfigures to isolate the failed source and rely on the remaining healthy source. The bus transfer contactors (BTCs) control cross-connection between the DC buses. With the #1 generator failed and the APU available, the system opens BTC2 to prevent backfeeding into the failed generator and to keep the two buses separated so the APU can power the load without fighting the failed source. This ensures proper source priority and avoids reverse power flow. If BTC2 stayed closed, there could be unwanted cross-connection that risks backfeeding the failed generator and destabilizing the power distribution.

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