No.1 SSDG was operating in parallel with...

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Question 1 of 205eccefa4bacbc34ba4d481d3

No.1 SSDG was operating in parallel with No.2 SSDG in supplying the 480 VAC main bus while sharing the electrical load evenly. As a result of a problem, if No.1 SSDG begins to motorize, but the generator has not yet tripped out by the action of the reverse power relay, what would be the indication of this?

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🔍 Key Concepts

• Parallel operation of generators and what it means for one generator to motorize instead of generate • How a kilowatt (kW) meter behaves when real power flow reverses direction (from taking load to driving as a motor) • The function and effect of a reverse power relay just before it trips a generator offline

💭 Think About

• Think about whether motoring means the generator is supplying power to the bus or absorbing power from the bus and how that changes meter indications. • Ask yourself which instrument (ammeter, kW meter, power factor meter) directly shows the direction of real power flow, not just the magnitude. • Consider what happens to the real power reading on a kW meter when the machine changes from generator mode to motor mode but is still connected to the bus.

✅ Before You Answer

• Identify which meter actually shows real power and its direction (not just current or power factor). • Decide whether motoring would make that reading go up, down, or cross through zero into an opposite direction indication. • Confirm that reverse power protection trips on reverse real power, not on current magnitude alone or unity power factor.

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