Question 185Electricity/Electronics - QMED70% to pass
Attempting to parallel an AC generator which is out of phase with the bus will result in which of the following conditions?
AI Explanation
The correct answer is D) The alternator breaker should trip.
When attempting to parallel an AC generator that is out of phase with the bus, it will result in the alternator breaker tripping. This is because the out-of-phase condition will cause a large current to flow through the alternator, potentially damaging the alternator or related electrical components. The alternator breaker is designed to trip in this situation to protect the electrical system.
The other answer choices are incorrect. Option A is incorrect because the power factor would not be "unitized" (presumably the intended meaning is "unity"). Option B is incorrect because the synchronizing lamps would not burn out, as they are designed to indicate the phase difference. Option C is incorrect because the kVA would increase, not decrease, due to the out-of-phase condition.
Related Questions
#183 When paralleling two alternators, the synchronizing lamps remain lit as the synchroscope pointer approaches the 0°. What does this indicate? #184 What governor settings are the load sharing characteristics of two diesel-generators operating in parallel mostly dependent upon? #186 Which of the following statements is true concerning the operation of two alternators in parallel? #187 You are paralleling two alternators. The synchronizing lamps grow dim and are totally darkened as the synchroscope pointer approaches the 0° position. What does this indicate? #188 You are attempting to parallel two AC generators, and the synchroscope pointer is revolving in the fast direction. What is the frequency of the oncoming generator relative to the bus frequency?