【Joint Study*】【Electrical Version 20160201】
Thread Content
Participation reward: 2 Wealth. Reward for correct answer: 9 wealth. In a three-phase symmetric system with an ungrounded neutral point, when there is a metallic single-phase ground fault, the relative ground voltage of the non-faulty phases ( ). a Unchanged; b Slight increase; c 31/2 times increase.
In a three-phase symmetrical system with an ungrounded neutral point, when there is a metallic single-phase ground fault, the relative to-ground voltage of the non-faulty phases is (c). a Unchanged; b Slight increase; c Increase by 31/2 times.
In a three-phase symmetrical system with an ungrounded neutral point, when a metallic single-phase ground occurs, the relative ground voltage of the non-faulty phases remains unchanged (a stays the same).
In a three-phase symmetrical system with an ungrounded neutral point, when there is a metallic single-phase ground fault, the relative ground voltage of the non-faulty phases is (C). a Unchanged; b Slight increase; c Increase by 31/2 times.
In a three-phase symmetrical system with an ungrounded neutral point, when there is a metallic single-phase ground fault, the relative to-ground voltage of the non-faulty phases is (c). a Unchanged; b Slight increase; c Increase by 31/2 times.
c increased by 31/2 times~~~~~~~~~~~~~
In a three-phase symmetric system with an ungrounded neutral point, when there is a metallic single-phase ground fault, the relative ground voltage of the non-faulty phases is (A). a Unchanged; b Slight increase; c Increase by 31/2 times.