If two AC generators have just been placed...

🔍 Key Concepts

• Parallel operation of AC generators – what conditions must match before and after closing the breaker • Real power (kW) vs. reactive power (kVAR) – which control affects which type of load sharing • Governor speed control vs. field excitation – which one mainly changes frequency and kW, and which one mainly changes voltage and kVAR

💭 Think About

• Ask yourself: when two generators are already synchronized and connected, what adjustment will make one unit pick up more or less kW (real power) without changing system voltage much? • Consider how you would correct a situation where one generator is taking more mechanical load (prime mover effort) than the other – what control on the engine or turbine affects that? • Think about which controls are mainly electrical (voltage/reactive power) and which are mainly mechanical (speed/real power). Which type of control would be used for equal kW sharing?

✅ Before You Answer

• Verify which device directly affects prime mover speed and torque, because that is tied to kW sharing between paralleled generators. • Confirm which control is primarily used to adjust voltage and reactive power (kVAR) rather than real power. • Eliminate any options that are mainly associated with voltage regulation components rather than with sharing of real power between generators.

If two AC generators have just been placed in parallel manually, how is the kilowatt load initially distributed evenly?

a balance coil

changing field excitation

adjusting the governor control settings

a rheostat

🔍 Key Concepts

💭 Think About

✅ Before You Answer